CA1288627C - Camera having interchangeable lenses - Google Patents
Camera having interchangeable lensesInfo
- Publication number
- CA1288627C CA1288627C CA000548365A CA548365A CA1288627C CA 1288627 C CA1288627 C CA 1288627C CA 000548365 A CA000548365 A CA 000548365A CA 548365 A CA548365 A CA 548365A CA 1288627 C CA1288627 C CA 1288627C
- Authority
- CA
- Canada
- Prior art keywords
- lens
- mount
- photographing lens
- camera
- electrical contact
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B3/00—Focusing arrangements of general interest for cameras, projectors or printers
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B17/00—Details of cameras or camera bodies; Accessories therefor
- G03B17/02—Bodies
- G03B17/12—Bodies with means for supporting objectives, supplementary lenses, filters, masks, or turrets
- G03B17/14—Bodies with means for supporting objectives, supplementary lenses, filters, masks, or turrets interchangeably
Abstract
ABSTRACT OF TEE DISCLOSURE
A camera and interchangeable lenses for such camera in which it is automatically detected whether or not the lens mounted on the camera has an automatic focusing capability. If it does, respective sets of electrical contacts provided on the lens and camera body are employed to transmit and receive a series of different data between the camera body and the lens. If it does not, the only a single datum is transmitted, for example, an open lens-stop value of the lens, is transmitted over the two sets of contacts. An automatic focusing actuation voltage applied from the camera body can be sensed to determine whether or not the lens has the automatic focusing capability.
A camera and interchangeable lenses for such camera in which it is automatically detected whether or not the lens mounted on the camera has an automatic focusing capability. If it does, respective sets of electrical contacts provided on the lens and camera body are employed to transmit and receive a series of different data between the camera body and the lens. If it does not, the only a single datum is transmitted, for example, an open lens-stop value of the lens, is transmitted over the two sets of contacts. An automatic focusing actuation voltage applied from the camera body can be sensed to determine whether or not the lens has the automatic focusing capability.
Description
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CAMERA HAVING INTERCHANGEABLE LENSES
SCOPE OF THX INVENTION
The present invention relates to a photographing camera capable of being used with a plurality of types of interchangeable lens systems ~lens-interchangeable camera) and to a-photographing lens for the photographing cameraO
BRIEE~ DESCRIPTION OF THE DP~WINGS
Fig. 1 is a front view of a prior art camera body having an AE capability;
Fig. 2 is a rear view of a lens used with the camera body of Fig. l;
Figs~ 3 and 4 are sectional views showing data transmission electrical contacts used in both the prior art and the invention;
Fig. 5 is a schematic block diagr~sm showing t~se lens of Fig. 2 coupled electrically to the camera body oE
Fig. l;
Fig. 6A i5 a schematic block diagram oE a photographing lens constructed in accordance with a first embodiment of the invention, and Fig. 6B shows a rear view of the lens of Fig. 6A;
Fig. 7 shows a front view of a camera body having an AF capability according to the present invention;
,, .1 , 1 Fig. 8 is a schematic block diagram showing the lens of Fig, 6 electrically coupled to a camera body;
Fig. 9 is a schematic block diagram of a photographing lens constructed in accordance with a second embodiment of the invention;
Fig. 10 shows a rear view of the lens of Fig. 9;
--Fig. llA is a schematic block diagram of a camera body having an AF capability and constructed in accordance with the present invention;
Fig. llB is a front view of the camera of Fig. llA;
Fig. 12 is a block schematic diagram showing the ~lens of Fig. 9-coupled to a camera'body in accordance with one example of usage of the invention;
Fig. 13 is a block schematic diagram showing the lens of Fig. 9 coupled to a camera body in accordance with another example of usage of the invention;
Fig. 14 shows a modification of the lens of FigO 9;
Fig. 15 is a block schematic diagram of a camera body constructed in accordance with a further embodiment of the invention;
Fig. 16A is a block schematic diagram of a controller of the invention;
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1FigO 16B is a flowchart used to explain the operation of the controller of Fig. l~A and Fig. 17 is a diagram showing th~ use of a camera body of the invention with a conventional lens.
BACKGROUND OF T~IE INVENTION
Generally, a lens-interchangeable camera has an AE
(automatic exposure~ capability. For execution of such AE, data of lens characteristic values such as an open 10lens-stop value (full-opened diaphragm value) and a minimum lens-stop value (full-closed diapharagm value) for : :each photographic lens and data for change-over between automatic exposure control mode and manual exposure control mode must be transmitted to the camera body.
15Accordingly, data-transmission electrical contracts are provided both on the camera body and on the photographic lens so as to be connected in a predetermined relation.
An example of such data-transmission electrical contacts, as disclosed in Japanese Patent Unexamined 20Publicat;on No.162$31/1984 filed by the present Applicant is shown in Figs. 1 through 4.
The design of aforementioned electrical contacts takes into account the fact that the AF body 101 is designed to receive lenses having an AF capability as well r~ r ' .~ ~ ' . .
2~7 as conventional photographing lenses which have no AF
capability.
A photographing lens having an AF capability and capable of being mounted on the AF body 101 is described in Japanese Patent Application Publication No. 234141/1986, also filed by the present applicant.
This photo~raphing lens is also designed to be usable with conventional camera bodies which have no AF capability, based on the same design philosophy as described above for 1 o the AF body.
For camera users who use only the AF body 101, it is, however~ unnecessary for photographing lenses to be usable with other camera bodies. Such photographing lenses are provided a~ exclusive parts. By providirg these photographing lenses as exclusive parts I the cost of the lenses can be reduced.
In view of the aforementioned circumstances, it is therefore an object of the present invention to provide a photographing lens suitable for attachment to an AF body which has a reduced cost.
In Figs. 1 to 4, reference numeral 211 designates a camera body, 213 a mount of the camera body, 215 a photographing lens, and 217 a mount of the photographing lens .
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1 Each of the mounts 213 and 217 is also made of an electrically conductive ~aterial, for example, a material prepared by applying a plating treatment or the like to brass. Each of the mounts 213 and 217 serves as a connector between the camera body 211 and the photographing lens 215 and as an electrical ground.
The mount 213 of the camera body 211 is provided with an electrical contact group 227, for example, a group composed of five electrical contacts 221a, 222a, 223a, 224a and 225a electrically insulated from the mount 213 and arranged so as to be projectable from the surface of the mount 213, The aforementioned electrical contacts are provided on the mount 213 and 217 in the manner to now be described, Fig. 1 is a front view showing the camera body 101 seen ~rom the mount. Fig.2 is a rear view of a lens used with the camera body shown in Fig.l. Fig. 3 is a schematic sectional view taken along a line I - I in Fig. 1 showing the electrical contact 221a. Similarly, Fig. 4 is a schematic sectional view taken along a line II
- I~ in Fig. 1 showing the electrical contact 231a.
Each of the electrical contacts designated by reference numerals 221a, 222a, 223a, 224a and 225a is electrically insulated from the mount 213 and is provided ., ,'~J',~.
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1 so as to be able to project from the surface of the mount.
That is, as shown typically by the contact indicated by reference numeral 221a in Fig. 3, each of the electrical contacts is electrically insulated from the mount 213 by an insulating layer 18 and normally projects from the surface of the mount 213 (as shown by the solid line in Fig. 3).- Further, each oE the contacts is provided with a spring 19 which urges the contact against the mating contact when a photographing lens or rear converter is mounted to the camera body 211 (as shown by the broken line of Fi9. 3).
The electrical contact designated by reference numeral 231a is electrically insulated from the mount 213 and provided so as to be unable to project from the surface of the mount (Fig. 4). The structure of the contacts 221a, 222a, 223a, 224a and 225a is as illustrated in Fig. 3.
The mount 217 of the photographing lens 215 is provided with an electrical contact group 229 corresponding to the electrical contact group 227. The electrical contact group 229 is composed of five electrical contacts 221b, 222b, 223b, 224b and 225b as shown in Fig. 2, which are not projectable from the surface of the mount 217 and which are electrically insulated from the mount 217. That is, the contacts 221b, ,, ~....................... .
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1 222b, 223b, 224b and 225b are constructed as illu~trated in Fig. 4.
Further, the mount 21~ of the camera body 211 is provided with another electrical contact 231a electrically s insulated from the mount 213 and arranged so as to not project from the surface of the mount 213. That is, the structure is the same as that illustrated in Fig. 4. The mount 217 of the photographing lens 215 is also provided with an electrical contact 231b corresponding to the electrical contact 231a, the electrical contact 231b being electrically insulated from the mount 217 and arranged so as to be able to project from the surface of the mount 217 as shown in Fig. 3 When the aforementioned photographing lens 215 is mounted on the aforementioned camera body 211, respective data are transmitted as follows. The data of the open lens-stop value is transmitted through three pairs of contacts (221a, 221b), (222a, 222b) and (223a, 223b) included in the electrical contact groups 227 and 229.
The data of the minimum lens-stop value is transmitted through two pairs o~ contacts ~224a, 224b) and (225a, 225b) included in the electrical contact yroups 227 and 229. The data for change-over between automatic exposure control mode and manual exposure control mode is transmitted through the electrical contact 231a (as , : ~ .
36~
1 described in detail later). For example, the data of lens characteristic values are transmitted as follows.
The contacts included in the lens-side electrical contact group 229 are pretreated corresponding to the type of the photographing lens such that some contacts are coated with an insulating material while others are not and are~~ free to make electrical connections with corresponding contacts on the body-side mount. A voltage i5 supplied through body-side pull-up resistors so that the voltage level at each of the insulated contacts is raised and the voltage level at each of the other contacts connected to the mount (grounded contacts) is reduced.
Thus, the data of lens characteristic values is obtained by the combination of such high and low signals generated corresponding to the respective data of lens-stop values.
The data for change-over between automatic exposure control mode and manual exposure control mode may be generated as follows, The lens-~ide electrical contact 231b is connected to the lens-side mount 217 (i.e, the contact 213b is grounded). When a stop ring incorporated in the photographing lens is set in a predetermined position, the lens-side contact 231b touches the body-side contact 231a. When the stop r~ng is rotated from the predetermined position, the lens-side electrical contact 231b is moved away from the body-side electrical contact ,. . . .
' ` ' ' ' ' ~ ', ,'~ ' ' ~ ' 1 231a. Thus, the data for change~over between automatic exposure control mode and manual exposure control mode is obtained on the basis o two states, namely, whether or not the lens-side electrical contact 231b touches the body-side electrical contact 231a.
These data are inputted to the controller in the camera body.
Although the aforedescribed data-transmission electrical contacts are simple in construction, the data for lens characterlstic values and the data for change-over between automatic exposure control mode and manual exposure control mode can be securely transmitted to the camera body.
A further example of a lens-interchangeable camera having an AF capability i5 disclosed in Japanese Patent Unexamined Publication No. 4916/1985. Fig. 5 is a diagram showing such a camera having such an AF capability.
The camera of this type has a mechanism for automatically moving a lens of the photographing lens group to the focused position. More exactly, the photographing lens 241 for the AF camera has a plurality of lens elements including a lens 243 movable for focusing, a motive power transmitting device 245 for moving the movable lens 243, and a ROM.(read-only memory) 247 for storing information (called "lens characteristic , ~8~
l data"~ such as data indicative of open or minimum lens-stop values of the photographing lens 241, data indicative of photographic conditions corresponding to the position of the lens while being moved ~or focusing~ and the like.
On the other hand/ the camera body 251 of the AF
camera includes a controller 253 for effecting AE and AF
operations, an actuator 55 for moving the lens of the photographing lens group to the focused position, and other necessary parts~
In the prior art, phptographing lenses of a type provided with an AF capability have been designed to be used together with an exclusive camera body 251.
Accordingly, various kinds of data necessary for AE and AF
control must be transmitted through exclusive data-transmission electrical contacts 261.
For the benefit of the camera user, it is des.ired that expensive camera bodies and photographing lenses be interchangeable so that they need not be replaced by new products whenever new bodies or lenses appear on the market. However; in the prior art photographing lens having an AF mechanism, a problem exists in tha~ the photographing lens is not interchangeable with both a camera body having an AE mechanism and a camera body having an AF capability.
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6;27 1 In view of the aforementioned cixcumstances, it is therefore an object of the present invention to provide a photographing camera high in usability.
Another object of the present invention in to provide a photographing lens suitable for attachment to an AF body which has a reduced cost.
-The other object of the present invention is to provide a photographing lens which not only can be atta¢hed to a camera body having an AF capability, but also can be effectively used wlth a camera body having an AE capability.
_UMMARY OF THE INVENTION
To a~tain the first-mentioned object, the present invention provides a photographing lens having a lens system including an automatic focusing movable lens and a lens ROM for storing unigue data of the lens system, the : photographing lens being characterized in that it further comprises;
a lens-side mount adapted to be attached to a mount of a camera body;
a group of electrical contacts provided on the lens-side mount and respectively connected to different data terminals of the lens ROM; and "~:~
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1 a control electrical contact provided on the lens-side mount for supplying electric power from the side of - the camera body to the lens ROM for driving the lens ROM.
In such an arrangement according to the present invention, not only can the lens ROM be driven by electric power supplied through the electric power supply electrical contact, but also data transmission can be made between the camera body and the lens ROM through the group of electrical contacts.
Further, the present invention provides a photographing lens which comprises: a lens ROM for feeding lens characteristic data to a camera body to take photograph in either the AE or AF mode; a group of electrical contacts respectively connected to diEferent data terminals of the lens ROM and provided in a phbtographing lens mount; a control electrical contact provided in the mount to control the lens ROM; and change-over means for changing over the group of electrical contacts between a first state where the group of electrical contacts are exclusively used to transmit different data, such as for example reset signal, clock signal and serial data from the lens ROM, and a second state where the group of electrical contacts are all used to transmit one datum, for example, the open lens-stop Yalue oE the photographing lens, with the state being , .
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1 determined in accordance with voltage on the control electrical contact.
Preferably, the control electrical contact is provided on the mount so as to be able to pro~ect from the surface of the mountO
Also, the change-over means is preferably constitu~ted by a group of electrical switches provided between the control contact and each of the group of electrical contacts.
The change-over mean~ is preferably incorporated in the lens ROM.
In the arrangement according to the present invention, when the lens ROM control electrical contact is at the voltage where the lens ROM is actuated, the aforementioned change-over means acts on the electrical contact group connected to the lens ROM so that, for example, one contact of the electrical contact group is connected to a reset signal input terminal to transmit a reset signal from the camera hody to the lens ROM, another contact i8 connected to a cloclc signal input terminal, and a further contact is connected to a lens characteristic data output terminal to transmit lens characteristic data from the lens ROM to the camera body.
on the other hand, when the lens ROM control electrical contact is not at the voltage where the lens ,... ... .
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~2~8~7 1 ROM is actuated, the change-over means connects the electrical contact group to transmit only one datum, such as the open lens-stop value data of the photographing lens.
To further atta.in the above and other objects, the camera body according to the present invention is provided with a mount to which a mount of a photographing lens is to be fitted, and is characterized in that it further comprises: an electrical contact provided on the body~side mount for determining whether the photographing lens has .
an automatic focusing capability or not, and a group of electrical contacts provided on the body-side mount for transmitt;ng different data in the case where the photographing lens has an automatic focusing capability and for transmitting only one datum in the case where the photographing lens has no automatic focusing capability.
It is preferable that a voltage for driving the automatic focusing device of the photographing lens be applied from the camera body to the photographing lens through the electrical contact for indicating whether or not the photographing lens has an automatic focusing capability.
Moreover, it is preferable that the group of electrical contacts and the electrical contact for indicating whether the photographing lens has an automatic ,~ .
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~28~36~7 1 focusing capability or not be provided on the body-side mount in such a manner as to be able to project from the surface of the body-side mount.
In such an arrangement according to the present invention, when the photographin~ lens is mounted on the camera body, whether the photographing lens has an automatic focusing capability or not can be automatically determined. Further, necessary data can be transmitted through the group of electrical contacts corresponding to the two cases as to whether the photographing lens has an automatic focusing capability or not.
,.,-. ,-,~ .~t. isassumed that.,,a Yoltage for driving the automatic focusing dPvice of the photographing lens is applied from the camera body to the photographing lens through the el,ectrical contact for indicating whether the photographing lens has an automatic focusing capability.
In the case of the aforementioned construction and when a photographing lens having an automatic focusing capability suitable for the camera body has been mounted on the ' camera bodyl a predetermined voltage is fed to the photographing lens through the electrical contact so that the' voltage at the electrical contact assumes a predetermined value. On the contrary, if a photographing lens having no automatic focusing capability has been mounted on the camera body, no such predetermined voltage ~.. ,.,; .; ~
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1 is applied to the photographing lens, and hence the voltage at the electrical contact has a value different from the predetermined value. Accordingly, whether the photographing lens mounted on the camera body has an automatic focusing capability or not can be judged by controlling the voltage at the electrical contact.
Further,-the function of the electrical contact group can be changed by sensing the voltage on the above contact.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
A first embodiment of the present invention will be described in detail with reference to the drawings.
These drawings are for the purpose of mere illustration - ~ and not of limitation. All parts ordinarily provided in the camera body or photographing lens may be not shown in the drawings. It is therefore to be understood that variou$ changes in the size, shape and arrangement of parts may be'made without'departing from the spirit of the invention. Like numerals in each of the drawings refer to like parts.
20 An example of the construction of a photographing lens according to the present invention will be now described. Fig. 6A is a schematic block diagram showing the internal arrangement of an embodiment of a photographing lens according to the invention, and Fig. 6B
i9 a schematic perspective view showing an example of the construction of the photographing lens according to the invention. Fig. 7 is a front view of a camera body having an AF capability according to the present invention. In ..
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l these drawings, . reference numeral 71 designate~ a photographing lens according to the invention.
In Fig~ 6A, reference numeral 72 desi~nates a mount rovided on the photographiny lens 71 ~which hereinafter i5 sometimes referred to as "lens-side mount"~.. The lens-side mount 72 is used ~or mounting the photographing lens 71 onto another member such as a camera body lOI as shcwn in-Fig. 7, a suitable rear converter, or the like, and the lens-side mount 72 corresponds to the lO. body-side mount 213. ~he lens-side mount 72 is ~ormed of ; a. conductive material prepared by applying a plat~ng --. .;.: treatment or t:he like to brass in th~ same manner as ~~described ~above -with respect- to'the body-sidé mount 213.
In this embodiment, the lens-side mount 72 ~unctions as an electrical ground.
R~ference numeral 73 designates a lens ROM. The l~ns ROM 73 stGres lens characteristic data to make AE and AF operations possible. As described before, the lens c~aracteristic data includes, for example, an open lens-stop value, a minimum lens~stop value, a coe~ficient for : converting the amount oE divergence oE a movable lens from the ~ocal point with respect to the subject into a quantity of length along which the movable lens is to be moved (as will be described later in more detail). If the : 25 photographing lens is a zoom lens, the lens characteristic :.. . . ~ , , :
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1 data ~nclude open lens-stop ~alues varying with zoomin~, quantities for shifting the focal distance, and the like. .
Reference numeral 74 designates a ground terminal of the lens RQM 73. The ~round terminal 74~ for ex~mple, can be connect~d to the lens-side mount 72.
Reference 'numeral 75 designates a group oE
elec~rical contacts respectively connected to different terminals of the lens ROM 73 and serving to transmit data between the lens ROM and the camera body taS shown in . Fig. 7). In thls embodiment,.the electrical contact ~roup 75 is composed of three electrical contacts 75a, 75b and .. ;.,. .75c correspondins to the electrical contact group 175 Qf ----.s-, -,~.1 th.e camera body 101. ' ' ' ' '':' ~~~''~'' --Reference numeral 77 designates an electrical c,ontact for supplying electric power from the camera body to the lens ROM 73 to drive the lens ROM 73 (the electrical contact 77 is hereina~ter sometimes reEerred to a~ an "electrical source contact"). The electrical source contact 77 is connected to a predetermined terminal of the lens ROM 73. ~he electrical source contact 77 corresponds to a photographing lens identification electri.cal contact 177 of the camera body 101~ whereby the lens ~OM 73 is made operative when electric power is supplied through the identification electrical contact 177.
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1The electrical contacts 75a~ 75b/ 75c and 77 are respectively arxanged so as to touch the body-side electrical contacts 175a, 175b, 175c and 177 when the photographing lens 71 is mounted on the camera body 101 as . described above with respect to Fig. 7. Preferably, the contacts 75a, 75b, 75c and 77 are electrically insulated from th~ lens-side mount 72 and construc~ed so as to not project from the surface of the mount 72, as described above with respect to Fig. 4. ~he concavo-convex shape of each o~ the elect.rical contaçts provided on the mount i~
not limited in this embodiment and may be changed if necessary.
-Further7~~the photographing lens 71 of thè
invention has a lens system including a lens 87 movable f~r focusing, and a motive power transmitting device 89 for transmittirlg motive power to the movable lens 87 ~om a driving motor provided on the camera body~
To betl:er understand the photographing lens oE the present invention, the operation of the lens 71 will be ~ described briefly with reference to the case where the lens has been mounted on the AF body 101 described above with respect to Fig. 7.
Fig. 8 is a typical block diagram showing a camera composed of the photographing lens ~1 of the present 25in~ention and the aforementioned AF body 101.
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~20-1 In such an arrangement, a voltage (for example +5V~ for driving the lens ROM 73 i5 supplied from the controller 105 of the AF body 101 to the lens ~OM 73 throu~h the identification el,ectrical contact 177 and the lens-side electric source contact 77.
While ~he lens ROM is being driven, data tra~smission necessary for photographing is made between the camera body lDl and the photographing lens 71. For exampler the data transmission can be carried out in the following manner.
The reset signal from the controller 105 of the AF
--.,,~.,... . body .lOl_~is c,pplied to..th,e. lens,,ROM 73 ,.through the ... .. . . . . .. .. ... . . -- ' '~. ~'electrïcal~ conl:acts 175a~ and '75a with a predetermined period. Further~ the-clock signal from the controller 105 of the AP body 1.01 is fed to the lens. ROM 73 through the contacts 175b and 75b. The a~orementioned lens characteristic data, such as the open lens-stop value, the minimum lens-stop value and the like are serially transmitted from t~e lens ROM 73 to the controller lOS
20' through the contacts 75c and 175c in response to the reset 3iynal ~nd clock ~ignal.
Further, a portion of the light from the subject transmitted through the photographing,lens 71 is directed to the image pickup 106. In the controller 105, the a~ount of divergence of the focusing lens 87 from the , ' - ' ~', ' 2~
1 focu~ed position with respect to the subject is determined bas~d on the data from the image pickup 106. Further, in the controller 105, the amount by which the len~ 87 is to be moved is calculated in accordance with the amounk of s divergence from the focused position when the controlle~
- 105 j`udges that the subject is out of focus based on a comparison with a certain reference value. Accordingly, the movable lens 87 is moved as necessary by the driving motor 107. Further, with respect to automatic exposura, a conventional arrangement can be used.
-- Accordin~ to the aforementioned construction, photographing in_both AF and AE modes can be made.
The present invention is not limited to th~
aforementioned embodimentO That is, although in the aorementioned embodiment the contact ~roup connected to the various data terminals of the lens ROM is composed of three electrical contacts~ the number of electrical contacts constituting the contact group can be chan~ed in accordance with the type and .~uantity of data to be transmitked.
Further, it is to be understood that the number o~
contacts provided on the mount is not limited to the number used in the aforementioned embodiment and can be increased if needed.
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1 As de~cribed above-, reference numeral 181 desi~nates an electrical contact provided on the camera body l.al for the purpose of detecting the change-over signal indicating whether exposure control is to be carried out automatically or manually. In the case where the ch~nge-over mechanism for switching between autom~tic exposure-control mode and manual exposure control mode is included in the stop ring of the photographing lens in the same manner as the prior art, an electrical contact corresponding to the .contact 1~1 can be provided in the photographin~ :Lens of the present invention, as shown by a ; broken line in Fi~.. 8~ .. .
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~ ~ ~ Another~eg~mple of a photographing lens embodying the present inve~tion will be now describedO Fig. 9 i5 a schematic bloc~ diagram showing the internal construction of the second embodiment of the photographing lens according to She lnvention. Fig. 10 is a schematic perspective view showing an example of the secon~
emhodiment of a photographing lens according to the inventionO In these drawings, reference numeral 271 designates a photog~aphing lens according to the invéntion.
In ~ig. 9, reference numeral 273 designates a lens R~M. The lens ROM 273 stores lens characteristic data ~or b~th AE and AF operations. Reference numeral 275 . . .
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1 designates a group of electrical contacts respectively connected to different terminals of the lens ROM 273 and serving to transmit data between ~he lens ROM and the camera body~ In this embodiment, the electrical cQntact group 275 is, for example, composed of three electrical contacts 275a, 275b and 275c. Reference numeral 277 designates a lens ROM control electrical contact. ~or example, the control electrical contact 277 is provided to supply a source voltage from the camera body to the lens ROM 273. When the source uoltage is supplied ~rom the contact 277, the lens ROM 273 is in operation~ Reference numeral 274 -designates a ground ~erminal. For example, . . .
:-~~.;'jr- - the--ground ternlinal 274~can-be connected to the mount of the photographing lensO
- Each of reference numerals 279a and 279b designates an electrical contact, for example, for t~ansmitting a minimum lens-stop value to the camera body.
In the embodi~ent shown in Fig. 9, a binary-coded digital signal, that is, a minimum lens-stop value expressed by "O" and "1", is transmitted to the camera body through the electrical contacts 279a and 279b. Reference numeral 281 designates an electrical contact for transmitting data for changing over control between automatic exposure control mode and manual exposure control mode.
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1 The respectiYe elèctrical contacts 275a, 275b~
275c, 27~a, 279b and 281 and the control electrical contacts- 277 are attached to the photographing lens as shown in Fig. 10.. Pig. 10 i~ a perspective view showing .the photographing lens according to the invention. In this embodiment, the respective cont~cts 275a, 275b, 275c, 279a~ 279~ and 281 are provided on the mount of the - - photographing ~ens 271 in the same arrangement and manner as described above for the contacts 221b, 222b, 223b, 10 224b, 225b ancl 231b in Fi~. 2. In other words, the respectiYe cont;ac.ts 275a, 275b, 275c, 279a and 279b are ::-.. - electrically i.nsulated. from the mount 285 a.nd are constructed -so as-to~not project`from the surface of the mount 285. The contact 281 is electrically insulated from the mount. 285.and provided 50 as to be able to project from the mount 285. On the other hand, the contact 277 is electrically insulated from the mount 285 and provided at a predetermined position so as to able to project from the mount 285. The mount 285 functions as an electrical ground.
Reference numeral 283 designates a change-over circuit for contro~lin~ the functions of the electrical contact groups 273. In this embodiment, the change-over circuit is constructed as follows. The emitter of a PNP
transistor Trl acting as an electronic switch is connected , '' ' ' :
. .
.
-~5-1 to the electrical .contact 275a, the latter b.e.ing connected to one data terminal 273a of the lens ROM 273. Similarly, the emitter.of a PNP transistor Tr2 is connected to the electric~l contact 275b, which is connected to another data terminal 273b, and the emitter of a PNP translstor Tr3 is connected to the electrical contact 2~5c connected to a ~rther data terminal 273c. The base of each transistor is connected to the lens ROM control electrical contact. 277 connected to th~ lens ROM 273. Further,. the collectors o the transistors are either grounded or electrically open, which ones of the collectors are -._ ...... ;.grounded-being .determined.-according to the type o the - ~ - photographing ].ens. In the case shown in Fig. 9, the collector of t.he transistor Trl is left open and the collectors of the other transistors Tr2 and Tr3 are grounded. In t:his case, when the electrical potential of the control electrical contact 277 is substantially ground potential, each o the transistors is in the ON
state. If a voltage is supplied to each of the electrical contacts 275a, 275b and 275c through a pull-up resistox, the voltage state o the contact 275a is a high level while the con~acts 275b and 275c are at a low level.
Further, the photographing lens 271 of the invention has a lens system having a lens 287 movable for focusing, and a .
.
. :: :
' - ' ..
. ' 1 motive power trahsmitter 289 for transmitting mo-tive power from the camera body to the lens 287.
The operations of the photographing lens and camera b~dy of the second embodiment will be described with rer.erence to the following two examples, of which the first relate~ to the case where the photographing lens o the invention is a~tached to an. exclusive camera body having an AF me~hanism, and the other relates to the case where the photographing len5 is attached to a conventional camera body as described above with reference to Fig. 1.
.
~, i . L ~ ' '- -. . ;. . : .Th~. QE,e~rations_ of .the ..photographing lens and ~ camera body wiIl be described as to the former casë where the photographi~g lens of the invention i~ attached to an exclusive camera body having an A~ capability.
Fig. llA is a block diagram ~howing the internal construction of the AF body, and Fig. llB is a schematic front view showing a main part o~ the AF body.
The AF body 301 has a mount 303 which includes electrical con~acts 375a, 375b and 375c respectively corresponding to the electrical contacts 275a, 275b and 275~ of the photographiny lens, a control electrical contact 377 corresponding to the lens ROM control electrical contact 277, and electrical contacts 379a, 379b, and 381 corresponding to the eleatrical contacts . .
-~7-1279a, 279b and 281 of the photographing lens. Further, the AF body 301 has a controller 305 ~or takin~ a photo~raph with AE and AF operations; and an actuating device 3~7 (motor) ~or actuating the movable focusing lens -5 - - 2~7 of the photographing lens system.
Fig. llB shows the condition in which the respective electrical contacts 375a, 375b, 375c/ 377, 37~a, 379b and 381 are attached to the AF body 301. That i8, th3 contacts 375a, 375b, 375c, 379a and 375b are 10provided on the mount 303 of.the AF body 301 in the same - a~rangement ancl manner as described above for the contacts - 2~- 2~1a, 222a, 2.'3a, 224a, 225a and 231b in Fig. 1. In , - : , . . . : . - .
short, the contacts 375a, 375b, 375c, 379a and 379b are electrically irlsulated Erom the mount 303 and provided so as to be able t:o project from the surface oE the mount 303 (structure of Fig. 3). The contact 381 is electrically insulated from the mount 303 and does not project from the surface of the mount 303 ~structure of Fig. ~). Further, the contact 377 is provided at a predetermined position on the mount 303 so as to be able to project from the mount 303, and it is electrically insulated from the mount 303.
The mount 303 functions as an electric ground~
Fig. 12 is a block diagram ~howing the photographing lens 271 of the invention attached to the af~rementioned AF body 301.
.
, ~2~38~2~
-2~
, .
1 In this embodiment, a voltage (for example, ~S V~
for actuating the lens RoM is supplied from the controller 305 o~ the A~ ~ody 301 to the lens RVM through the contact 377 and the lens ROM control contact 277 o~ the photographing lens 271. At the same time, the voltage is supplied to the base of each of the PNP transistors Trl to Tr3 of the chan~e-over circuit 283. Accordingl~, each of the transistors Trl to Tr3 is set to the OFF state while ghe lens ROM 273 is operated in the usual manner.
Accordingly, the circuit between the contact 275a and the .
terminal 273a, the circui~ between the contact 275b and -'. '.. -.:3 .the~terminal 273b, and the circuit between the contact 275c and the'terminàl 273c-are made opèrative so that data transmission between the controller 305 of the AF body 301 and the lens ROM 273 of the photographing lens 271 can be made.
For exzlmple, data transmission is carried out as follows. The reset signal (RE) from the contro'ller 305 of the AF body is fed to the lens ROM 273 through the ' contac~.s 375a and 27~a with a predetermined period.
Furthert the clock signal (CKj from the controller 305 oE
the' AF body is applied to the lens ROM 273 through the contacts 375b and 27~b. Accordingly, various kinds oE
data, such as the open lens-stop value data o~ the photographing lRns 271, position data of the lens 285, and : .
- . ~
.
~ -, 36~7 1 the like are serially trans~itted rom the lens ROM 273 to the controlle~ 305 through the contacts 275c and 375c in response to the reset s,ignal and clock signal. Further, the minimum lens-stop value data is transmitted through the pairs of contacts 379a and 279a, and 379b and 279b.
The data, for change-over between automatic exposure control- mode and manual exposure control mode is discriminated by whether or not the contact 281 of the photographing lens is in touch with the contact 381 of the camera body~ .
According to the aforementioned construction, photographing in both AF and AE modes can be carried out.
Example 2 The oFerations of the photographing lens and camera body wi:Ll now be described as to the latter case where the photographing lens 271 of the invention is attached to a conventional camera body 211 as described with reference to Fig. 1.
Fig. 13 is a block diagram showing the typical ' sta~e in which the photographing lena 271 of the invention is attached to the conventional camera body 211.
' In this arrangement, the lens ROM control contact 277 oE the photographing lens 271 touches the mount of the camera body 211 so that the contact 277 is grounded.
Accordingly, the lens ROM 273 is set to the OFF state (not ~38$2~3 1 powered~, whereupon the data terminals 273a, 273b and 273c of the lens ROM 273 are in high-impedance ~tates. The .
bases o~ the transistors ~rl to Tr3 of the change~over circuit ~83 are grounded so that the transistors Trl to Tr3 are- in the ON state. As. described above, the collectors of the transistors.may be grounded or may be electri~ally open in order to establish a signal correspo~ding to the type o~ the photographing lens,.~o~
example, to establish a signal corres~onding to the open lens-stop value data of the lens. Accordinglyr with a voltage (for example, ~5 V~ applied to each of the transistors Trl to Tr3 through the pull-up resistors 211a prov;ded o~ tlle 'c~mera ~ody ~-211 and the electrical conta~ts 275a, 275b and 275c, the voltage of the - electrical contacts 275b and 275c connected to the transistors hatring grounded collectors are at the low levelO The ~oltage o~ the el.ectrical contact 275a connected to the transistor.having an open. collector i~
the high level. Thus, a signal expressing the open len~-stop value data is transmitted to the camera body.
The minimum lens-stop value data is transmitted to the camera body through the pairs of contact~ 224a and 279ar and 225a and 279b.
Further, the data for change--over between automatic exposure control mode and and manual exposure ' - ' , ~' ~ ... ~, - .
; .
1 control mode is discriminated by whether or not the conta_t 281 touches the contact 231a. These data are inputted to the controller 211b of the camera body 211.
Acc~rdi~g to the aforementioned arran~ement, photographing using an AE ope~ation can be carried out using a conventional camera body to which the inventive photographing lens having an AF capability The prese~t invention is not limited to the aforementioned arrangements.
Althoul~h the aforementioned embodiment has been described with reference the case where the change-over circuit 283 is connected to the lens ROM 273 outside o~
the lens R~M 273, it is à matter of course that the change over ciecuit may be incorporated in the lens ROM
and that electronic switches, such as PNP transistors, forminy constituent parts of the change-over circui~ may be incorporate~ in a custom IC chip if the lens ROM is prepared as a custom IC.
Moreover, althouyh the aforementioned embodiment has been described with respect to the case where the change-over circuit includes a plurality of PNP
transistors~ it i5 a matter of course that the change-over circuit may be composed of other parts. For examplet the change-over circuit may be constructed as shown in Fig. 14, in which diodes 311 are connected to respective . ~ . ~ , ' . .
.
.
1 electric~l contacts, whereb~ a low level signal is applied to ea~h of the electrical contacts when the lens ROM 273 is in the OFF state. In other words, each diode 311 is interpQsed between a respective electrical contact and the lens RQM control contact so that the control contact functio~s as a common cathode. With this arrangement, the same e~cts ~s in the aforementioned embodiment are obtained.
Although the aforementioned embodiment has been described with respect to the case where an electrical contact group switched by the change-over circuit 283 is -- composed of three electrical contacts~ the number of the contacts con~tituting the electrical contact group can be set in accordance with the ~uantity of data to be transmitted.
Further t it is to be understood that the number of electrical contact~ provided in the camera body and photogxaphing lens can be varied as needed.
Moreover t although the aforementioned embodiment has been de8cribed with respect to the case where a single lens ROM control electrical contact is providedl it is to be ~nderstood that the invention is not limited to this ~pecific embodiment and that a plurality of lens ROM
control electrical contacts may be provided.
~2~
1As apparent from the above description, the photographing lens of the present invention has a change over circuit for changing the yroup of electrical contacts between ~ne stclte where the contacts are exclusively used 5- - to transmit different data when the voltage on the lens ROM control electrical contact is set to power the lens - ROM, and- the other state where the contacts are used to transmit one datum as a whole when the voltage on the lens ROM control contact does not power the lens ROM.
10Accordingly, when the photographing lens is attached to an exclusive camera body having an AF
.. . .capability, a voltage for energizing the lens ROM is .. . . . .................................. . .
applied to the lens ROM control electrical contact 50 ~hat photographing in both AF and AE modes can be carried out.
15On the other hand, when the photographing lens is attac~ed to a conventional camera bodyr the lens ROM control electrical contact is grounded to stop the lens ROM ~rom operating and to transmit only one datum, for example, the open lens-stop value/ from the change-over circuit to the 20camera body through the electrical contact group, whereby photograph;ng in the AE mode only can be effected.
Therefore, the invention provides a photogr.aphing lens having interchangeability such that it can be used with an exclusive camera body having an AF capability and . ,. ' ' . :
1 also with a conventional camera body without losin~ the AE
capability.
- A furthex embodiment of the present invention will be described in detail with reference to the drawingsO
~n example o~ the construction of a camera body accordiny to this embodiment o~ the present invention will be now ~escribed. Fig. 15 is a schematic block diagrarn showins the internal construction of a pre~erred embodiment of a camera body according to the invention.
In Fig 15, re~rence numeral 501 designates a camera body, and reference numeral 503 designates a body~
;side mount to which a photographic lens can be mounted.
.. ' , .... . . .. .. .
The camera body 501 is provided with a controller 505, an image ~ickup 506, and a lens driving motor 507.
Other parts of ~he cam~ra body will be described in detail later~ Further, the mount 503 of the camera body 501 has an electrical contact group 575 composed of a plurality of electrical contact~, an electrical contact 577 for identifying the photographing lens, and electrical contacts 579a, 579b and 581.
In thii embodiment, the controller 505 includes a microcomputer (CPU~ 591, and a circuit 601 for changing over the function of the electrical contact group 575 as to d~ta transmission between the CPU 591 and the photo~raphing lens.
.~ .
, , ~Z~ 7 -35~
1~he ima~e pickup 506i which is connected to the CPU 591~ is provided to form an image of the subject from a portion of the light transmitted through the photographing lens (not shown). For example, the image 5pickup 506 may be implemented with a circuit containing a CCD (charge coupled device).
~The lens drivîng motor 507 is connected to the CPU
5~1 to drive the automatic focusing movable lens provided in thP photographing lens.
10The primary functions of the controller 105 will now be described.
The CPU 591 in the controller 505 carries out AE
control. Further, the CPU 591 performs automatic focusing AF control so that the movable lens in the photographing 15lens can be moved by the lens driving motor 507 in the camera body 50] corresponding to the in~ormation received f~om the image pickup portion 506. The CPU 591 carries out other various t~pes o control necessary for photographing.
20In the case where the photographing lens mounted on the camera body 501 has an automatic focusing capability, the contact ~unction change-over circuit 601 in the controller portion 505 change~ over the contacts o~
the electrical contact group 575 as respective contacts 25transmit di~ferent data. On the other hand, in the case '. ~ . ; ,, ' ' ' ' ' 1 where the photographing le~s has no automatic focusin~
capability, the circuit $01 changes over the contacts o the elec-trical contact group 575 to transmit one datum as a whole~
The contacts of the electrical contact group 575 are r:espectively connected to different data terminals of the CPU -591 through the aforementioned contact function change-over ci.rcuit ~01. In this em~odiment~ the electrical cont:act group is composed o~ three contacts - 575a, 575b anl~ 575c, which are connected to outside terminals 601a, 601b and 601c, respectively, of the contact function change-over circuit 601.
r '' As ~escribed above, the electrical contacts 575a, 575b and 575c function either as exclusive contacts for transmitting different data or as non-exclusive contacts for trans~itting only one datum dependiny on whether or not the photographing lens mounted on the camera body 501 has an AF capability.
- The identi~ication electrical contact 577 is provided to indicate whether the photographing lens mounted on the camera body 501 has an automatic focusing capability or not. The identification electrical co~tact is connected to an outside terminal 601d of the change-over circuit 601.
' - : .
' ~ . ' " - '' ~.
"- ' ' ' -62~7 1 The electrical contacts 579a and 579b are provided to transmit data, for example, the min.imum lens-stop value .
data of the. photographing lens, to the CPU 591 in the camera body. The electrical contact 581 is provided to .5 indicate whether photographing should be carried out under . automatic exposure control or whether it should be carried out under manual exposure control.
In this embodiment, the respective contacts designated by ~eference numerals 575a, 575b, 575c, 579a, 579b and 581 are provided on.the mount 503 of the camera body 501 in the same arranyement and manner as described - above with respect to the contacts 221a, 222a, 223a, 224a, - 225a~and 23ia in~ Fig. 1. In other wordsr the respective contacts 575a, 575b, 575c, 579a and 579b are electrically insula~ed from the mount 503 and are constructed so as to be able to project from the surface of the mount 503.
~urtherr the contact 581 is electrically insulated from the mount 503 and arranged so as to not project from the mount 503. Further, the identification electrical contact 577 is provided at a predetermined .position of the mount 503 so as to be able to project from the surface of the mount 503r and it is electrically insulated from the mount 503. The mount 503 functions as an electrical ground.
An example of the const.ruction of the aforementioned contact function chanye-over circuit 601 , ' , . .
.
CAMERA HAVING INTERCHANGEABLE LENSES
SCOPE OF THX INVENTION
The present invention relates to a photographing camera capable of being used with a plurality of types of interchangeable lens systems ~lens-interchangeable camera) and to a-photographing lens for the photographing cameraO
BRIEE~ DESCRIPTION OF THE DP~WINGS
Fig. 1 is a front view of a prior art camera body having an AE capability;
Fig. 2 is a rear view of a lens used with the camera body of Fig. l;
Figs~ 3 and 4 are sectional views showing data transmission electrical contacts used in both the prior art and the invention;
Fig. 5 is a schematic block diagr~sm showing t~se lens of Fig. 2 coupled electrically to the camera body oE
Fig. l;
Fig. 6A i5 a schematic block diagram oE a photographing lens constructed in accordance with a first embodiment of the invention, and Fig. 6B shows a rear view of the lens of Fig. 6A;
Fig. 7 shows a front view of a camera body having an AF capability according to the present invention;
,, .1 , 1 Fig. 8 is a schematic block diagram showing the lens of Fig, 6 electrically coupled to a camera body;
Fig. 9 is a schematic block diagram of a photographing lens constructed in accordance with a second embodiment of the invention;
Fig. 10 shows a rear view of the lens of Fig. 9;
--Fig. llA is a schematic block diagram of a camera body having an AF capability and constructed in accordance with the present invention;
Fig. llB is a front view of the camera of Fig. llA;
Fig. 12 is a block schematic diagram showing the ~lens of Fig. 9-coupled to a camera'body in accordance with one example of usage of the invention;
Fig. 13 is a block schematic diagram showing the lens of Fig. 9 coupled to a camera body in accordance with another example of usage of the invention;
Fig. 14 shows a modification of the lens of FigO 9;
Fig. 15 is a block schematic diagram of a camera body constructed in accordance with a further embodiment of the invention;
Fig. 16A is a block schematic diagram of a controller of the invention;
.~ ,,, : ~. ,, ;
- . . :
:' - ~ ' ' ' ~ ~t'y ~ ~ 8 ~
1FigO 16B is a flowchart used to explain the operation of the controller of Fig. l~A and Fig. 17 is a diagram showing th~ use of a camera body of the invention with a conventional lens.
BACKGROUND OF T~IE INVENTION
Generally, a lens-interchangeable camera has an AE
(automatic exposure~ capability. For execution of such AE, data of lens characteristic values such as an open 10lens-stop value (full-opened diaphragm value) and a minimum lens-stop value (full-closed diapharagm value) for : :each photographic lens and data for change-over between automatic exposure control mode and manual exposure control mode must be transmitted to the camera body.
15Accordingly, data-transmission electrical contracts are provided both on the camera body and on the photographic lens so as to be connected in a predetermined relation.
An example of such data-transmission electrical contacts, as disclosed in Japanese Patent Unexamined 20Publicat;on No.162$31/1984 filed by the present Applicant is shown in Figs. 1 through 4.
The design of aforementioned electrical contacts takes into account the fact that the AF body 101 is designed to receive lenses having an AF capability as well r~ r ' .~ ~ ' . .
2~7 as conventional photographing lenses which have no AF
capability.
A photographing lens having an AF capability and capable of being mounted on the AF body 101 is described in Japanese Patent Application Publication No. 234141/1986, also filed by the present applicant.
This photo~raphing lens is also designed to be usable with conventional camera bodies which have no AF capability, based on the same design philosophy as described above for 1 o the AF body.
For camera users who use only the AF body 101, it is, however~ unnecessary for photographing lenses to be usable with other camera bodies. Such photographing lenses are provided a~ exclusive parts. By providirg these photographing lenses as exclusive parts I the cost of the lenses can be reduced.
In view of the aforementioned circumstances, it is therefore an object of the present invention to provide a photographing lens suitable for attachment to an AF body which has a reduced cost.
In Figs. 1 to 4, reference numeral 211 designates a camera body, 213 a mount of the camera body, 215 a photographing lens, and 217 a mount of the photographing lens .
,, .
., ~: , .. . . .
''- ' . ' : ' ' .
' ' ', , ' -~L2~
1 Each of the mounts 213 and 217 is also made of an electrically conductive ~aterial, for example, a material prepared by applying a plating treatment or the like to brass. Each of the mounts 213 and 217 serves as a connector between the camera body 211 and the photographing lens 215 and as an electrical ground.
The mount 213 of the camera body 211 is provided with an electrical contact group 227, for example, a group composed of five electrical contacts 221a, 222a, 223a, 224a and 225a electrically insulated from the mount 213 and arranged so as to be projectable from the surface of the mount 213, The aforementioned electrical contacts are provided on the mount 213 and 217 in the manner to now be described, Fig. 1 is a front view showing the camera body 101 seen ~rom the mount. Fig.2 is a rear view of a lens used with the camera body shown in Fig.l. Fig. 3 is a schematic sectional view taken along a line I - I in Fig. 1 showing the electrical contact 221a. Similarly, Fig. 4 is a schematic sectional view taken along a line II
- I~ in Fig. 1 showing the electrical contact 231a.
Each of the electrical contacts designated by reference numerals 221a, 222a, 223a, 224a and 225a is electrically insulated from the mount 213 and is provided ., ,'~J',~.
' , :
1 so as to be able to project from the surface of the mount.
That is, as shown typically by the contact indicated by reference numeral 221a in Fig. 3, each of the electrical contacts is electrically insulated from the mount 213 by an insulating layer 18 and normally projects from the surface of the mount 213 (as shown by the solid line in Fig. 3).- Further, each oE the contacts is provided with a spring 19 which urges the contact against the mating contact when a photographing lens or rear converter is mounted to the camera body 211 (as shown by the broken line of Fi9. 3).
The electrical contact designated by reference numeral 231a is electrically insulated from the mount 213 and provided so as to be unable to project from the surface of the mount (Fig. 4). The structure of the contacts 221a, 222a, 223a, 224a and 225a is as illustrated in Fig. 3.
The mount 217 of the photographing lens 215 is provided with an electrical contact group 229 corresponding to the electrical contact group 227. The electrical contact group 229 is composed of five electrical contacts 221b, 222b, 223b, 224b and 225b as shown in Fig. 2, which are not projectable from the surface of the mount 217 and which are electrically insulated from the mount 217. That is, the contacts 221b, ,, ~....................... .
.
., , ' .`.
1 222b, 223b, 224b and 225b are constructed as illu~trated in Fig. 4.
Further, the mount 21~ of the camera body 211 is provided with another electrical contact 231a electrically s insulated from the mount 213 and arranged so as to not project from the surface of the mount 213. That is, the structure is the same as that illustrated in Fig. 4. The mount 217 of the photographing lens 215 is also provided with an electrical contact 231b corresponding to the electrical contact 231a, the electrical contact 231b being electrically insulated from the mount 217 and arranged so as to be able to project from the surface of the mount 217 as shown in Fig. 3 When the aforementioned photographing lens 215 is mounted on the aforementioned camera body 211, respective data are transmitted as follows. The data of the open lens-stop value is transmitted through three pairs of contacts (221a, 221b), (222a, 222b) and (223a, 223b) included in the electrical contact groups 227 and 229.
The data of the minimum lens-stop value is transmitted through two pairs o~ contacts ~224a, 224b) and (225a, 225b) included in the electrical contact yroups 227 and 229. The data for change-over between automatic exposure control mode and manual exposure control mode is transmitted through the electrical contact 231a (as , : ~ .
36~
1 described in detail later). For example, the data of lens characteristic values are transmitted as follows.
The contacts included in the lens-side electrical contact group 229 are pretreated corresponding to the type of the photographing lens such that some contacts are coated with an insulating material while others are not and are~~ free to make electrical connections with corresponding contacts on the body-side mount. A voltage i5 supplied through body-side pull-up resistors so that the voltage level at each of the insulated contacts is raised and the voltage level at each of the other contacts connected to the mount (grounded contacts) is reduced.
Thus, the data of lens characteristic values is obtained by the combination of such high and low signals generated corresponding to the respective data of lens-stop values.
The data for change-over between automatic exposure control mode and manual exposure control mode may be generated as follows, The lens-~ide electrical contact 231b is connected to the lens-side mount 217 (i.e, the contact 213b is grounded). When a stop ring incorporated in the photographing lens is set in a predetermined position, the lens-side contact 231b touches the body-side contact 231a. When the stop r~ng is rotated from the predetermined position, the lens-side electrical contact 231b is moved away from the body-side electrical contact ,. . . .
' ` ' ' ' ' ~ ', ,'~ ' ' ~ ' 1 231a. Thus, the data for change~over between automatic exposure control mode and manual exposure control mode is obtained on the basis o two states, namely, whether or not the lens-side electrical contact 231b touches the body-side electrical contact 231a.
These data are inputted to the controller in the camera body.
Although the aforedescribed data-transmission electrical contacts are simple in construction, the data for lens characterlstic values and the data for change-over between automatic exposure control mode and manual exposure control mode can be securely transmitted to the camera body.
A further example of a lens-interchangeable camera having an AF capability i5 disclosed in Japanese Patent Unexamined Publication No. 4916/1985. Fig. 5 is a diagram showing such a camera having such an AF capability.
The camera of this type has a mechanism for automatically moving a lens of the photographing lens group to the focused position. More exactly, the photographing lens 241 for the AF camera has a plurality of lens elements including a lens 243 movable for focusing, a motive power transmitting device 245 for moving the movable lens 243, and a ROM.(read-only memory) 247 for storing information (called "lens characteristic , ~8~
l data"~ such as data indicative of open or minimum lens-stop values of the photographing lens 241, data indicative of photographic conditions corresponding to the position of the lens while being moved ~or focusing~ and the like.
On the other hand/ the camera body 251 of the AF
camera includes a controller 253 for effecting AE and AF
operations, an actuator 55 for moving the lens of the photographing lens group to the focused position, and other necessary parts~
In the prior art, phptographing lenses of a type provided with an AF capability have been designed to be used together with an exclusive camera body 251.
Accordingly, various kinds of data necessary for AE and AF
control must be transmitted through exclusive data-transmission electrical contacts 261.
For the benefit of the camera user, it is des.ired that expensive camera bodies and photographing lenses be interchangeable so that they need not be replaced by new products whenever new bodies or lenses appear on the market. However; in the prior art photographing lens having an AF mechanism, a problem exists in tha~ the photographing lens is not interchangeable with both a camera body having an AE mechanism and a camera body having an AF capability.
~I , ,,," ~
.' .
, ~ ~
6;27 1 In view of the aforementioned cixcumstances, it is therefore an object of the present invention to provide a photographing camera high in usability.
Another object of the present invention in to provide a photographing lens suitable for attachment to an AF body which has a reduced cost.
-The other object of the present invention is to provide a photographing lens which not only can be atta¢hed to a camera body having an AF capability, but also can be effectively used wlth a camera body having an AE capability.
_UMMARY OF THE INVENTION
To a~tain the first-mentioned object, the present invention provides a photographing lens having a lens system including an automatic focusing movable lens and a lens ROM for storing unigue data of the lens system, the : photographing lens being characterized in that it further comprises;
a lens-side mount adapted to be attached to a mount of a camera body;
a group of electrical contacts provided on the lens-side mount and respectively connected to different data terminals of the lens ROM; and "~:~
.
, , . . ' '. . . :
' ~
2~
1 a control electrical contact provided on the lens-side mount for supplying electric power from the side of - the camera body to the lens ROM for driving the lens ROM.
In such an arrangement according to the present invention, not only can the lens ROM be driven by electric power supplied through the electric power supply electrical contact, but also data transmission can be made between the camera body and the lens ROM through the group of electrical contacts.
Further, the present invention provides a photographing lens which comprises: a lens ROM for feeding lens characteristic data to a camera body to take photograph in either the AE or AF mode; a group of electrical contacts respectively connected to diEferent data terminals of the lens ROM and provided in a phbtographing lens mount; a control electrical contact provided in the mount to control the lens ROM; and change-over means for changing over the group of electrical contacts between a first state where the group of electrical contacts are exclusively used to transmit different data, such as for example reset signal, clock signal and serial data from the lens ROM, and a second state where the group of electrical contacts are all used to transmit one datum, for example, the open lens-stop Yalue oE the photographing lens, with the state being , .
~, : ' ' ' ,~ ' :' 62~
1 determined in accordance with voltage on the control electrical contact.
Preferably, the control electrical contact is provided on the mount so as to be able to pro~ect from the surface of the mountO
Also, the change-over means is preferably constitu~ted by a group of electrical switches provided between the control contact and each of the group of electrical contacts.
The change-over mean~ is preferably incorporated in the lens ROM.
In the arrangement according to the present invention, when the lens ROM control electrical contact is at the voltage where the lens ROM is actuated, the aforementioned change-over means acts on the electrical contact group connected to the lens ROM so that, for example, one contact of the electrical contact group is connected to a reset signal input terminal to transmit a reset signal from the camera hody to the lens ROM, another contact i8 connected to a cloclc signal input terminal, and a further contact is connected to a lens characteristic data output terminal to transmit lens characteristic data from the lens ROM to the camera body.
on the other hand, when the lens ROM control electrical contact is not at the voltage where the lens ,... ... .
.
~2~8~7 1 ROM is actuated, the change-over means connects the electrical contact group to transmit only one datum, such as the open lens-stop value data of the photographing lens.
To further atta.in the above and other objects, the camera body according to the present invention is provided with a mount to which a mount of a photographing lens is to be fitted, and is characterized in that it further comprises: an electrical contact provided on the body~side mount for determining whether the photographing lens has .
an automatic focusing capability or not, and a group of electrical contacts provided on the body-side mount for transmitt;ng different data in the case where the photographing lens has an automatic focusing capability and for transmitting only one datum in the case where the photographing lens has no automatic focusing capability.
It is preferable that a voltage for driving the automatic focusing device of the photographing lens be applied from the camera body to the photographing lens through the electrical contact for indicating whether or not the photographing lens has an automatic focusing capability.
Moreover, it is preferable that the group of electrical contacts and the electrical contact for indicating whether the photographing lens has an automatic ,~ .
, .. .
. . . ~, . . .
~28~36~7 1 focusing capability or not be provided on the body-side mount in such a manner as to be able to project from the surface of the body-side mount.
In such an arrangement according to the present invention, when the photographin~ lens is mounted on the camera body, whether the photographing lens has an automatic focusing capability or not can be automatically determined. Further, necessary data can be transmitted through the group of electrical contacts corresponding to the two cases as to whether the photographing lens has an automatic focusing capability or not.
,.,-. ,-,~ .~t. isassumed that.,,a Yoltage for driving the automatic focusing dPvice of the photographing lens is applied from the camera body to the photographing lens through the el,ectrical contact for indicating whether the photographing lens has an automatic focusing capability.
In the case of the aforementioned construction and when a photographing lens having an automatic focusing capability suitable for the camera body has been mounted on the ' camera bodyl a predetermined voltage is fed to the photographing lens through the electrical contact so that the' voltage at the electrical contact assumes a predetermined value. On the contrary, if a photographing lens having no automatic focusing capability has been mounted on the camera body, no such predetermined voltage ~.. ,.,; .; ~
.
.' , . . ' ' .
38~
1 is applied to the photographing lens, and hence the voltage at the electrical contact has a value different from the predetermined value. Accordingly, whether the photographing lens mounted on the camera body has an automatic focusing capability or not can be judged by controlling the voltage at the electrical contact.
Further,-the function of the electrical contact group can be changed by sensing the voltage on the above contact.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
A first embodiment of the present invention will be described in detail with reference to the drawings.
These drawings are for the purpose of mere illustration - ~ and not of limitation. All parts ordinarily provided in the camera body or photographing lens may be not shown in the drawings. It is therefore to be understood that variou$ changes in the size, shape and arrangement of parts may be'made without'departing from the spirit of the invention. Like numerals in each of the drawings refer to like parts.
20 An example of the construction of a photographing lens according to the present invention will be now described. Fig. 6A is a schematic block diagram showing the internal arrangement of an embodiment of a photographing lens according to the invention, and Fig. 6B
i9 a schematic perspective view showing an example of the construction of the photographing lens according to the invention. Fig. 7 is a front view of a camera body having an AF capability according to the present invention. In ..
~,,, -~8~2~
l these drawings, . reference numeral 71 designate~ a photographing lens according to the invention.
In Fig~ 6A, reference numeral 72 desi~nates a mount rovided on the photographiny lens 71 ~which hereinafter i5 sometimes referred to as "lens-side mount"~.. The lens-side mount 72 is used ~or mounting the photographing lens 71 onto another member such as a camera body lOI as shcwn in-Fig. 7, a suitable rear converter, or the like, and the lens-side mount 72 corresponds to the lO. body-side mount 213. ~he lens-side mount 72 is ~ormed of ; a. conductive material prepared by applying a plat~ng --. .;.: treatment or t:he like to brass in th~ same manner as ~~described ~above -with respect- to'the body-sidé mount 213.
In this embodiment, the lens-side mount 72 ~unctions as an electrical ground.
R~ference numeral 73 designates a lens ROM. The l~ns ROM 73 stGres lens characteristic data to make AE and AF operations possible. As described before, the lens c~aracteristic data includes, for example, an open lens-stop value, a minimum lens~stop value, a coe~ficient for : converting the amount oE divergence oE a movable lens from the ~ocal point with respect to the subject into a quantity of length along which the movable lens is to be moved (as will be described later in more detail). If the : 25 photographing lens is a zoom lens, the lens characteristic :.. . . ~ , , :
.
: .
.
1 data ~nclude open lens-stop ~alues varying with zoomin~, quantities for shifting the focal distance, and the like. .
Reference numeral 74 designates a ground terminal of the lens RQM 73. The ~round terminal 74~ for ex~mple, can be connect~d to the lens-side mount 72.
Reference 'numeral 75 designates a group oE
elec~rical contacts respectively connected to different terminals of the lens ROM 73 and serving to transmit data between the lens ROM and the camera body taS shown in . Fig. 7). In thls embodiment,.the electrical contact ~roup 75 is composed of three electrical contacts 75a, 75b and .. ;.,. .75c correspondins to the electrical contact group 175 Qf ----.s-, -,~.1 th.e camera body 101. ' ' ' ' '':' ~~~''~'' --Reference numeral 77 designates an electrical c,ontact for supplying electric power from the camera body to the lens ROM 73 to drive the lens ROM 73 (the electrical contact 77 is hereina~ter sometimes reEerred to a~ an "electrical source contact"). The electrical source contact 77 is connected to a predetermined terminal of the lens ROM 73. ~he electrical source contact 77 corresponds to a photographing lens identification electri.cal contact 177 of the camera body 101~ whereby the lens ~OM 73 is made operative when electric power is supplied through the identification electrical contact 177.
~8~
1The electrical contacts 75a~ 75b/ 75c and 77 are respectively arxanged so as to touch the body-side electrical contacts 175a, 175b, 175c and 177 when the photographing lens 71 is mounted on the camera body 101 as . described above with respect to Fig. 7. Preferably, the contacts 75a, 75b, 75c and 77 are electrically insulated from th~ lens-side mount 72 and construc~ed so as to not project from the surface of the mount 72, as described above with respect to Fig. 4. ~he concavo-convex shape of each o~ the elect.rical contaçts provided on the mount i~
not limited in this embodiment and may be changed if necessary.
-Further7~~the photographing lens 71 of thè
invention has a lens system including a lens 87 movable f~r focusing, and a motive power transmitting device 89 for transmittirlg motive power to the movable lens 87 ~om a driving motor provided on the camera body~
To betl:er understand the photographing lens oE the present invention, the operation of the lens 71 will be ~ described briefly with reference to the case where the lens has been mounted on the AF body 101 described above with respect to Fig. 7.
Fig. 8 is a typical block diagram showing a camera composed of the photographing lens ~1 of the present 25in~ention and the aforementioned AF body 101.
' . .
.
:
~20-1 In such an arrangement, a voltage (for example +5V~ for driving the lens ROM 73 i5 supplied from the controller 105 of the AF body 101 to the lens ~OM 73 throu~h the identification el,ectrical contact 177 and the lens-side electric source contact 77.
While ~he lens ROM is being driven, data tra~smission necessary for photographing is made between the camera body lDl and the photographing lens 71. For exampler the data transmission can be carried out in the following manner.
The reset signal from the controller 105 of the AF
--.,,~.,... . body .lOl_~is c,pplied to..th,e. lens,,ROM 73 ,.through the ... .. . . . . .. .. ... . . -- ' '~. ~'electrïcal~ conl:acts 175a~ and '75a with a predetermined period. Further~ the-clock signal from the controller 105 of the AP body 1.01 is fed to the lens. ROM 73 through the contacts 175b and 75b. The a~orementioned lens characteristic data, such as the open lens-stop value, the minimum lens-stop value and the like are serially transmitted from t~e lens ROM 73 to the controller lOS
20' through the contacts 75c and 175c in response to the reset 3iynal ~nd clock ~ignal.
Further, a portion of the light from the subject transmitted through the photographing,lens 71 is directed to the image pickup 106. In the controller 105, the a~ount of divergence of the focusing lens 87 from the , ' - ' ~', ' 2~
1 focu~ed position with respect to the subject is determined bas~d on the data from the image pickup 106. Further, in the controller 105, the amount by which the len~ 87 is to be moved is calculated in accordance with the amounk of s divergence from the focused position when the controlle~
- 105 j`udges that the subject is out of focus based on a comparison with a certain reference value. Accordingly, the movable lens 87 is moved as necessary by the driving motor 107. Further, with respect to automatic exposura, a conventional arrangement can be used.
-- Accordin~ to the aforementioned construction, photographing in_both AF and AE modes can be made.
The present invention is not limited to th~
aforementioned embodimentO That is, although in the aorementioned embodiment the contact ~roup connected to the various data terminals of the lens ROM is composed of three electrical contacts~ the number of electrical contacts constituting the contact group can be chan~ed in accordance with the type and .~uantity of data to be transmitked.
Further, it is to be understood that the number o~
contacts provided on the mount is not limited to the number used in the aforementioned embodiment and can be increased if needed.
.
' ' ; ' ': '' " ' :
~L2~ i27 ,~ ~
1 As de~cribed above-, reference numeral 181 desi~nates an electrical contact provided on the camera body l.al for the purpose of detecting the change-over signal indicating whether exposure control is to be carried out automatically or manually. In the case where the ch~nge-over mechanism for switching between autom~tic exposure-control mode and manual exposure control mode is included in the stop ring of the photographing lens in the same manner as the prior art, an electrical contact corresponding to the .contact 1~1 can be provided in the photographin~ :Lens of the present invention, as shown by a ; broken line in Fi~.. 8~ .. .
. - .
~ ~ ~ Another~eg~mple of a photographing lens embodying the present inve~tion will be now describedO Fig. 9 i5 a schematic bloc~ diagram showing the internal construction of the second embodiment of the photographing lens according to She lnvention. Fig. 10 is a schematic perspective view showing an example of the secon~
emhodiment of a photographing lens according to the inventionO In these drawings, reference numeral 271 designates a photog~aphing lens according to the invéntion.
In ~ig. 9, reference numeral 273 designates a lens R~M. The lens ROM 273 stores lens characteristic data ~or b~th AE and AF operations. Reference numeral 275 . . .
.
. . .
i2~
-23~
1 designates a group of electrical contacts respectively connected to different terminals of the lens ROM 273 and serving to transmit data between ~he lens ROM and the camera body~ In this embodiment, the electrical cQntact group 275 is, for example, composed of three electrical contacts 275a, 275b and 275c. Reference numeral 277 designates a lens ROM control electrical contact. ~or example, the control electrical contact 277 is provided to supply a source voltage from the camera body to the lens ROM 273. When the source uoltage is supplied ~rom the contact 277, the lens ROM 273 is in operation~ Reference numeral 274 -designates a ground ~erminal. For example, . . .
:-~~.;'jr- - the--ground ternlinal 274~can-be connected to the mount of the photographing lensO
- Each of reference numerals 279a and 279b designates an electrical contact, for example, for t~ansmitting a minimum lens-stop value to the camera body.
In the embodi~ent shown in Fig. 9, a binary-coded digital signal, that is, a minimum lens-stop value expressed by "O" and "1", is transmitted to the camera body through the electrical contacts 279a and 279b. Reference numeral 281 designates an electrical contact for transmitting data for changing over control between automatic exposure control mode and manual exposure control mode.
- .
1 The respectiYe elèctrical contacts 275a, 275b~
275c, 27~a, 279b and 281 and the control electrical contacts- 277 are attached to the photographing lens as shown in Fig. 10.. Pig. 10 i~ a perspective view showing .the photographing lens according to the invention. In this embodiment, the respective cont~cts 275a, 275b, 275c, 279a~ 279~ and 281 are provided on the mount of the - - photographing ~ens 271 in the same arrangement and manner as described above for the contacts 221b, 222b, 223b, 10 224b, 225b ancl 231b in Fi~. 2. In other words, the respectiYe cont;ac.ts 275a, 275b, 275c, 279a and 279b are ::-.. - electrically i.nsulated. from the mount 285 a.nd are constructed -so as-to~not project`from the surface of the mount 285. The contact 281 is electrically insulated from the mount. 285.and provided 50 as to be able to project from the mount 285. On the other hand, the contact 277 is electrically insulated from the mount 285 and provided at a predetermined position so as to able to project from the mount 285. The mount 285 functions as an electrical ground.
Reference numeral 283 designates a change-over circuit for contro~lin~ the functions of the electrical contact groups 273. In this embodiment, the change-over circuit is constructed as follows. The emitter of a PNP
transistor Trl acting as an electronic switch is connected , '' ' ' :
. .
.
-~5-1 to the electrical .contact 275a, the latter b.e.ing connected to one data terminal 273a of the lens ROM 273. Similarly, the emitter.of a PNP transistor Tr2 is connected to the electric~l contact 275b, which is connected to another data terminal 273b, and the emitter of a PNP translstor Tr3 is connected to the electrical contact 2~5c connected to a ~rther data terminal 273c. The base of each transistor is connected to the lens ROM control electrical contact. 277 connected to th~ lens ROM 273. Further,. the collectors o the transistors are either grounded or electrically open, which ones of the collectors are -._ ...... ;.grounded-being .determined.-according to the type o the - ~ - photographing ].ens. In the case shown in Fig. 9, the collector of t.he transistor Trl is left open and the collectors of the other transistors Tr2 and Tr3 are grounded. In t:his case, when the electrical potential of the control electrical contact 277 is substantially ground potential, each o the transistors is in the ON
state. If a voltage is supplied to each of the electrical contacts 275a, 275b and 275c through a pull-up resistox, the voltage state o the contact 275a is a high level while the con~acts 275b and 275c are at a low level.
Further, the photographing lens 271 of the invention has a lens system having a lens 287 movable for focusing, and a .
.
. :: :
' - ' ..
. ' 1 motive power trahsmitter 289 for transmitting mo-tive power from the camera body to the lens 287.
The operations of the photographing lens and camera b~dy of the second embodiment will be described with rer.erence to the following two examples, of which the first relate~ to the case where the photographing lens o the invention is a~tached to an. exclusive camera body having an AF me~hanism, and the other relates to the case where the photographing len5 is attached to a conventional camera body as described above with reference to Fig. 1.
.
~, i . L ~ ' '- -. . ;. . : .Th~. QE,e~rations_ of .the ..photographing lens and ~ camera body wiIl be described as to the former casë where the photographi~g lens of the invention i~ attached to an exclusive camera body having an A~ capability.
Fig. llA is a block diagram ~howing the internal construction of the AF body, and Fig. llB is a schematic front view showing a main part o~ the AF body.
The AF body 301 has a mount 303 which includes electrical con~acts 375a, 375b and 375c respectively corresponding to the electrical contacts 275a, 275b and 275~ of the photographiny lens, a control electrical contact 377 corresponding to the lens ROM control electrical contact 277, and electrical contacts 379a, 379b, and 381 corresponding to the eleatrical contacts . .
-~7-1279a, 279b and 281 of the photographing lens. Further, the AF body 301 has a controller 305 ~or takin~ a photo~raph with AE and AF operations; and an actuating device 3~7 (motor) ~or actuating the movable focusing lens -5 - - 2~7 of the photographing lens system.
Fig. llB shows the condition in which the respective electrical contacts 375a, 375b, 375c/ 377, 37~a, 379b and 381 are attached to the AF body 301. That i8, th3 contacts 375a, 375b, 375c, 379a and 375b are 10provided on the mount 303 of.the AF body 301 in the same - a~rangement ancl manner as described above for the contacts - 2~- 2~1a, 222a, 2.'3a, 224a, 225a and 231b in Fig. 1. In , - : , . . . : . - .
short, the contacts 375a, 375b, 375c, 379a and 379b are electrically irlsulated Erom the mount 303 and provided so as to be able t:o project from the surface oE the mount 303 (structure of Fig. 3). The contact 381 is electrically insulated from the mount 303 and does not project from the surface of the mount 303 ~structure of Fig. ~). Further, the contact 377 is provided at a predetermined position on the mount 303 so as to be able to project from the mount 303, and it is electrically insulated from the mount 303.
The mount 303 functions as an electric ground~
Fig. 12 is a block diagram ~howing the photographing lens 271 of the invention attached to the af~rementioned AF body 301.
.
, ~2~38~2~
-2~
, .
1 In this embodiment, a voltage (for example, ~S V~
for actuating the lens RoM is supplied from the controller 305 o~ the A~ ~ody 301 to the lens RVM through the contact 377 and the lens ROM control contact 277 o~ the photographing lens 271. At the same time, the voltage is supplied to the base of each of the PNP transistors Trl to Tr3 of the chan~e-over circuit 283. Accordingl~, each of the transistors Trl to Tr3 is set to the OFF state while ghe lens ROM 273 is operated in the usual manner.
Accordingly, the circuit between the contact 275a and the .
terminal 273a, the circui~ between the contact 275b and -'. '.. -.:3 .the~terminal 273b, and the circuit between the contact 275c and the'terminàl 273c-are made opèrative so that data transmission between the controller 305 of the AF body 301 and the lens ROM 273 of the photographing lens 271 can be made.
For exzlmple, data transmission is carried out as follows. The reset signal (RE) from the contro'ller 305 of the AF body is fed to the lens ROM 273 through the ' contac~.s 375a and 27~a with a predetermined period.
Furthert the clock signal (CKj from the controller 305 oE
the' AF body is applied to the lens ROM 273 through the contacts 375b and 27~b. Accordingly, various kinds oE
data, such as the open lens-stop value data o~ the photographing lRns 271, position data of the lens 285, and : .
- . ~
.
~ -, 36~7 1 the like are serially trans~itted rom the lens ROM 273 to the controlle~ 305 through the contacts 275c and 375c in response to the reset s,ignal and clock signal. Further, the minimum lens-stop value data is transmitted through the pairs of contacts 379a and 279a, and 379b and 279b.
The data, for change-over between automatic exposure control- mode and manual exposure control mode is discriminated by whether or not the contact 281 of the photographing lens is in touch with the contact 381 of the camera body~ .
According to the aforementioned construction, photographing in both AF and AE modes can be carried out.
Example 2 The oFerations of the photographing lens and camera body wi:Ll now be described as to the latter case where the photographing lens 271 of the invention is attached to a conventional camera body 211 as described with reference to Fig. 1.
Fig. 13 is a block diagram showing the typical ' sta~e in which the photographing lena 271 of the invention is attached to the conventional camera body 211.
' In this arrangement, the lens ROM control contact 277 oE the photographing lens 271 touches the mount of the camera body 211 so that the contact 277 is grounded.
Accordingly, the lens ROM 273 is set to the OFF state (not ~38$2~3 1 powered~, whereupon the data terminals 273a, 273b and 273c of the lens ROM 273 are in high-impedance ~tates. The .
bases o~ the transistors ~rl to Tr3 of the change~over circuit ~83 are grounded so that the transistors Trl to Tr3 are- in the ON state. As. described above, the collectors of the transistors.may be grounded or may be electri~ally open in order to establish a signal correspo~ding to the type o~ the photographing lens,.~o~
example, to establish a signal corres~onding to the open lens-stop value data of the lens. Accordinglyr with a voltage (for example, ~5 V~ applied to each of the transistors Trl to Tr3 through the pull-up resistors 211a prov;ded o~ tlle 'c~mera ~ody ~-211 and the electrical conta~ts 275a, 275b and 275c, the voltage of the - electrical contacts 275b and 275c connected to the transistors hatring grounded collectors are at the low levelO The ~oltage o~ the el.ectrical contact 275a connected to the transistor.having an open. collector i~
the high level. Thus, a signal expressing the open len~-stop value data is transmitted to the camera body.
The minimum lens-stop value data is transmitted to the camera body through the pairs of contact~ 224a and 279ar and 225a and 279b.
Further, the data for change--over between automatic exposure control mode and and manual exposure ' - ' , ~' ~ ... ~, - .
; .
1 control mode is discriminated by whether or not the conta_t 281 touches the contact 231a. These data are inputted to the controller 211b of the camera body 211.
Acc~rdi~g to the aforementioned arran~ement, photographing using an AE ope~ation can be carried out using a conventional camera body to which the inventive photographing lens having an AF capability The prese~t invention is not limited to the aforementioned arrangements.
Althoul~h the aforementioned embodiment has been described with reference the case where the change-over circuit 283 is connected to the lens ROM 273 outside o~
the lens R~M 273, it is à matter of course that the change over ciecuit may be incorporated in the lens ROM
and that electronic switches, such as PNP transistors, forminy constituent parts of the change-over circui~ may be incorporate~ in a custom IC chip if the lens ROM is prepared as a custom IC.
Moreover, althouyh the aforementioned embodiment has been described with respect to the case where the change-over circuit includes a plurality of PNP
transistors~ it i5 a matter of course that the change-over circuit may be composed of other parts. For examplet the change-over circuit may be constructed as shown in Fig. 14, in which diodes 311 are connected to respective . ~ . ~ , ' . .
.
.
1 electric~l contacts, whereb~ a low level signal is applied to ea~h of the electrical contacts when the lens ROM 273 is in the OFF state. In other words, each diode 311 is interpQsed between a respective electrical contact and the lens RQM control contact so that the control contact functio~s as a common cathode. With this arrangement, the same e~cts ~s in the aforementioned embodiment are obtained.
Although the aforementioned embodiment has been described with respect to the case where an electrical contact group switched by the change-over circuit 283 is -- composed of three electrical contacts~ the number of the contacts con~tituting the electrical contact group can be set in accordance with the ~uantity of data to be transmitted.
Further t it is to be understood that the number of electrical contact~ provided in the camera body and photogxaphing lens can be varied as needed.
Moreover t although the aforementioned embodiment has been de8cribed with respect to the case where a single lens ROM control electrical contact is providedl it is to be ~nderstood that the invention is not limited to this ~pecific embodiment and that a plurality of lens ROM
control electrical contacts may be provided.
~2~
1As apparent from the above description, the photographing lens of the present invention has a change over circuit for changing the yroup of electrical contacts between ~ne stclte where the contacts are exclusively used 5- - to transmit different data when the voltage on the lens ROM control electrical contact is set to power the lens - ROM, and- the other state where the contacts are used to transmit one datum as a whole when the voltage on the lens ROM control contact does not power the lens ROM.
10Accordingly, when the photographing lens is attached to an exclusive camera body having an AF
.. . .capability, a voltage for energizing the lens ROM is .. . . . .................................. . .
applied to the lens ROM control electrical contact 50 ~hat photographing in both AF and AE modes can be carried out.
15On the other hand, when the photographing lens is attac~ed to a conventional camera bodyr the lens ROM control electrical contact is grounded to stop the lens ROM ~rom operating and to transmit only one datum, for example, the open lens-stop value/ from the change-over circuit to the 20camera body through the electrical contact group, whereby photograph;ng in the AE mode only can be effected.
Therefore, the invention provides a photogr.aphing lens having interchangeability such that it can be used with an exclusive camera body having an AF capability and . ,. ' ' . :
1 also with a conventional camera body without losin~ the AE
capability.
- A furthex embodiment of the present invention will be described in detail with reference to the drawingsO
~n example o~ the construction of a camera body accordiny to this embodiment o~ the present invention will be now ~escribed. Fig. 15 is a schematic block diagrarn showins the internal construction of a pre~erred embodiment of a camera body according to the invention.
In Fig 15, re~rence numeral 501 designates a camera body, and reference numeral 503 designates a body~
;side mount to which a photographic lens can be mounted.
.. ' , .... . . .. .. .
The camera body 501 is provided with a controller 505, an image ~ickup 506, and a lens driving motor 507.
Other parts of ~he cam~ra body will be described in detail later~ Further, the mount 503 of the camera body 501 has an electrical contact group 575 composed of a plurality of electrical contact~, an electrical contact 577 for identifying the photographing lens, and electrical contacts 579a, 579b and 581.
In thii embodiment, the controller 505 includes a microcomputer (CPU~ 591, and a circuit 601 for changing over the function of the electrical contact group 575 as to d~ta transmission between the CPU 591 and the photo~raphing lens.
.~ .
, , ~Z~ 7 -35~
1~he ima~e pickup 506i which is connected to the CPU 591~ is provided to form an image of the subject from a portion of the light transmitted through the photographing lens (not shown). For example, the image 5pickup 506 may be implemented with a circuit containing a CCD (charge coupled device).
~The lens drivîng motor 507 is connected to the CPU
5~1 to drive the automatic focusing movable lens provided in thP photographing lens.
10The primary functions of the controller 105 will now be described.
The CPU 591 in the controller 505 carries out AE
control. Further, the CPU 591 performs automatic focusing AF control so that the movable lens in the photographing 15lens can be moved by the lens driving motor 507 in the camera body 50] corresponding to the in~ormation received f~om the image pickup portion 506. The CPU 591 carries out other various t~pes o control necessary for photographing.
20In the case where the photographing lens mounted on the camera body 501 has an automatic focusing capability, the contact ~unction change-over circuit 601 in the controller portion 505 change~ over the contacts o~
the electrical contact group 575 as respective contacts 25transmit di~ferent data. On the other hand, in the case '. ~ . ; ,, ' ' ' ' ' 1 where the photographing le~s has no automatic focusin~
capability, the circuit $01 changes over the contacts o the elec-trical contact group 575 to transmit one datum as a whole~
The contacts of the electrical contact group 575 are r:espectively connected to different data terminals of the CPU -591 through the aforementioned contact function change-over ci.rcuit ~01. In this em~odiment~ the electrical cont:act group is composed o~ three contacts - 575a, 575b anl~ 575c, which are connected to outside terminals 601a, 601b and 601c, respectively, of the contact function change-over circuit 601.
r '' As ~escribed above, the electrical contacts 575a, 575b and 575c function either as exclusive contacts for transmitting different data or as non-exclusive contacts for trans~itting only one datum dependiny on whether or not the photographing lens mounted on the camera body 501 has an AF capability.
- The identi~ication electrical contact 577 is provided to indicate whether the photographing lens mounted on the camera body 501 has an automatic focusing capability or not. The identification electrical co~tact is connected to an outside terminal 601d of the change-over circuit 601.
' - : .
' ~ . ' " - '' ~.
"- ' ' ' -62~7 1 The electrical contacts 579a and 579b are provided to transmit data, for example, the min.imum lens-stop value .
data of the. photographing lens, to the CPU 591 in the camera body. The electrical contact 581 is provided to .5 indicate whether photographing should be carried out under . automatic exposure control or whether it should be carried out under manual exposure control.
In this embodiment, the respective contacts designated by ~eference numerals 575a, 575b, 575c, 579a, 579b and 581 are provided on.the mount 503 of the camera body 501 in the same arranyement and manner as described - above with respect to the contacts 221a, 222a, 223a, 224a, - 225a~and 23ia in~ Fig. 1. In other wordsr the respective contacts 575a, 575b, 575c, 579a and 579b are electrically insula~ed from the mount 503 and are constructed so as to be able to project from the surface of the mount 503.
~urtherr the contact 581 is electrically insulated from the mount 503 and arranged so as to not project from the mount 503. Further, the identification electrical contact 577 is provided at a predetermined .position of the mount 503 so as to be able to project from the surface of the mount 503r and it is electrically insulated from the mount 503. The mount 503 functions as an electrical ground.
An example of the const.ruction of the aforementioned contact function chanye-over circuit 601 , ' , . .
.
-3~-1 will now be described with reference to Fig. 16A.
- Fig. 16A is a block diagram showing a contact function chan~e-over .circuit, but it is to be und~rstood that the invention as to the contact function change-over circuit is not limited to thi~ specific embodiment and the circuit may be constructed of other' parts or implemente~ in softwar~.
In t~i~; embodiment, the contact function change-over circuit 601 includes four selective switching circuits 610 oE the same structure, which are connected to the electrical, contacts 575a, 575b, 575c, and S77, respectively.
- . . .
^ Each o~ the selèctive switching circuits 610 is composed of a first D-type flip-flop circuit (D-FF) 621 functio~ing as,an input-output change-over latch, a second D-FF 623 functioning as an output latch, a first three-~tate buffer 6~5 functioning as an output buffer, a second three-state buffer 627 functioning as an input buffer, and a pull-up resistor 62~. The relation of these constituent ' members and the relation of the selective switching circuits 610 and the electrical contacts or CPU will be described with reference to the electrical contact 575a as an exampie.
~he ~-output terminal of the .first D-FF 621 is ccnnected to the control terminal of the first three-state :
~2~
1 buf~er 625. The Q-output ter~inal of the first D-FF 621 is connected to the control terminal of the first three-state hu~fer 627. The Q-output terminal of the second D-FF 623 is connected to the input texminal of the first three-state huffer 625, The respective D-input terminals of the first and second D-FFs are connected to prede~ermined I/O terminals of the CPU 591.
The output terminal of the first three-state buffer 625 is connected to the electrical contact 575a o~
the body moun' 503 through the terminal 601a of the controller. T:~e terminal 601a is also connected to the . . . input terminal of the second three-state buffer 627. The output termina~ o~ the second three-state bu~fer 627 is connected to a predetermined input of the CPU 591.
For example, the same voltage (VDD) as the power source voltage of the CPU 591 is applied to the outside terminal 601a through the pull-up resistor 629.
The ot.her selective change-over circuits which relate to the electrical contacts 575b, 575c and 577 a~e connected between a corresponding electrical contact and the CPU in the same manner as described above for the electrical contact 575.
Corresponding to the voltage on the identification electrical contact 577, the change-over circuit 601 and .' ' ' ' ' ~' ' ' , - ~2~6~
- Fig. 16A is a block diagram showing a contact function chan~e-over .circuit, but it is to be und~rstood that the invention as to the contact function change-over circuit is not limited to thi~ specific embodiment and the circuit may be constructed of other' parts or implemente~ in softwar~.
In t~i~; embodiment, the contact function change-over circuit 601 includes four selective switching circuits 610 oE the same structure, which are connected to the electrical, contacts 575a, 575b, 575c, and S77, respectively.
- . . .
^ Each o~ the selèctive switching circuits 610 is composed of a first D-type flip-flop circuit (D-FF) 621 functio~ing as,an input-output change-over latch, a second D-FF 623 functioning as an output latch, a first three-~tate buffer 6~5 functioning as an output buffer, a second three-state buffer 627 functioning as an input buffer, and a pull-up resistor 62~. The relation of these constituent ' members and the relation of the selective switching circuits 610 and the electrical contacts or CPU will be described with reference to the electrical contact 575a as an exampie.
~he ~-output terminal of the .first D-FF 621 is ccnnected to the control terminal of the first three-state :
~2~
1 buf~er 625. The Q-output ter~inal of the first D-FF 621 is connected to the control terminal of the first three-state hu~fer 627. The Q-output terminal of the second D-FF 623 is connected to the input texminal of the first three-state huffer 625, The respective D-input terminals of the first and second D-FFs are connected to prede~ermined I/O terminals of the CPU 591.
The output terminal of the first three-state buffer 625 is connected to the electrical contact 575a o~
the body moun' 503 through the terminal 601a of the controller. T:~e terminal 601a is also connected to the . . . input terminal of the second three-state buffer 627. The output termina~ o~ the second three-state bu~fer 627 is connected to a predetermined input of the CPU 591.
For example, the same voltage (VDD) as the power source voltage of the CPU 591 is applied to the outside terminal 601a through the pull-up resistor 629.
The ot.her selective change-over circuits which relate to the electrical contacts 575b, 575c and 577 a~e connected between a corresponding electrical contact and the CPU in the same manner as described above for the electrical contact 575.
Corresponding to the voltage on the identification electrical contact 577, the change-over circuit 601 and .' ' ' ' ' ~' ' ' , - ~2~6~
-4~-1 the CPU 591 operate in the manner as follows. Fig. 16B is a flowchart showing the operation.
Fir~t, "0" is applied to the D-input terminal of the fiIst D-FF 621 in each of the selective switching circuits 610 relating to the eIectrical contacts 575a, 575b, 575c and 577, so that the Q and Q outputs are set to "0" and~ , respectively. At this time, the output buffer 625 is in the OFF state and the input buffer 627 in the ON state so that the voltages at the electrical contacts 575a, 575b, 575c and 577 are applied to the CPU
591. When the CP~ is in operation (Step 651), the signal (voltage state) on the electrical contact 577 is inputted to the CPU with a predetermined period (Step 252). The CP~ 591 judges whether the signal Sl on the electrical contact 577 is a "1" or 10l- (Step 653).
- In the case where S1 is a "0", the CPU 591 judges that the photographing lens mounted on the camera body is of a conventional type. In this case, the group 575 of electrical contacts are switched 90 as to receive only the open len~-stop value data of the conventi~nal photographing lens (Step 654). Thus~ AE control is carried out as in the prior art.
On the contrary, in the case where Sl is a "l"t the CPU 591 judges that the photographing lens mounted on the camer~ body has an AF capability. In this caset "1"
~2~
is applied to ~he. D-inl?ut termina:L of the Eirst D :EF 621 in each of th~ selec-tive, switching circuits 610 relatin~
to the electrical contacts 575a, 575b and 575c, so,that Q
and Q ar~ se~ to "1" and "0", respectively. At this time, the output buf~er 625 is placed in the ON stateJ and the input buffer 627 in the OFF state so that the respective electrical contacts 575a, 575b'and 575c in the electrical contact group 575 function as exclusive contacts for transmitting different data. Accordingly, communication with the outside circuit can be carried out (Step 655).
The operation of the above-described camera body with an excll~sive photographing lens having an AF
capability of the type shown in Fig. 9 has already been discussed above with respect to Fig. 12. The operation of the inventiv,e camera body with a conventional photographing lens mounted on the camera body of the invention will now be considered.
Fi~. 17 is a block diagram showing a conventional photographing lens 415 attached to the camera body 501 of ' the invention.
In such an arrangement, an electrical contact corresponding to the identiEication electrical contact 577 of the camera body 501 is not provided on the conventional photographing len~ 415, and hence the electrical contact 577 is directly in touch with themount 417 of the .
. .
- ' ~ ' - , ' - ' : :
~2~
1 conventional photographing lens 415. Accordingly, the contact 577 is grounded so that the voltage at the contact 577 is at a low lev~l. When the voltaye at the contact 577 is a_ a low level, the CPU 591 is not operative under S automatic-focusing photographing control. Further, when the voltage at the identification electrical contact 577 is at a- low level~ the change-over circuit 610 in the controller 505 operates to apply the voltages at each of the electrical contacts 575a, 575b and 575c to the controller 505.
On the other hand, the conventional photdgraphing lèns 415 is pretrea~ed at each of the electrical contacts 421b, 422b and 423b so that some `contacts are ~oated with an insulating nraterial and some contacts are connected to the mount. Acc:ordingly, when a source voltage of the CPU
591 is applied to the body-side contacts 575a, 575b and 5~5c, the voltages at the body-side contacts 575a, 575b and 575c are respectively determined corresponding. to whether the contacts 421b, 422b and 423b are electrically 2~ insulated ~open~ or whether the contacts are grounded.
Thus, the open lens-stop value data of the photoyraphing lens is transmitted from the photographing lens to the controller g05 corresponding to the combination of the voltage states.
~ ' , , - .
.
1 Further, the minimum lens-stop value is transmitted throug~l the ~airs of contacts 4~4b and 579a, and 425b and 579b. Also, the data for selecting between automatic exposure control mode and manual exposure control mode is set by whether or not the contact 431b ls in touch with the contact 581. These data are applied to the controller 505 of the camera body 501.
According to the aforementioned construction, AE
photographing operations can be carried out even in the case where the conventional ~hotographing lens is mounted on the camer~. body of the invention having an A~
capability.
- As is apparent from the-above description, the camera body of the present invention .incorporates an identification electrical contact to automatically de~ermine whethYr the camera lens mounted on the camera body has an automatic ~ocusing capability or not.
Purther, necessary data transmission can be made through the elsctrical contact group in accordance with the type of the photographing len~, that is, whether or not the photographing lens has an automatic focusing capability.
Accordinglyr when an exclusive photographing lens having an AF capabilit~ is mounted on the ~amera body, photographing in either the AF or AE mode can be per~ormed. On the other handl when a convention~.l :, . , ' ' .................... . ' .
., ~8~6~7 1 photosraphing lens is mounted on the camera body, ph~tog~aphing in the AE made can be carried out in the same manner as in the prior art.
r~ herefore, the invention provides a camera body having interchangeability such that it can use both an exclusive photographing lens having an A~ capability and a conventi:onal ph~to~raphing lens without sacrificing the AE
capability.
.
Fir~t, "0" is applied to the D-input terminal of the fiIst D-FF 621 in each of the selective switching circuits 610 relating to the eIectrical contacts 575a, 575b, 575c and 577, so that the Q and Q outputs are set to "0" and~ , respectively. At this time, the output buffer 625 is in the OFF state and the input buffer 627 in the ON state so that the voltages at the electrical contacts 575a, 575b, 575c and 577 are applied to the CPU
591. When the CP~ is in operation (Step 651), the signal (voltage state) on the electrical contact 577 is inputted to the CPU with a predetermined period (Step 252). The CP~ 591 judges whether the signal Sl on the electrical contact 577 is a "1" or 10l- (Step 653).
- In the case where S1 is a "0", the CPU 591 judges that the photographing lens mounted on the camera body is of a conventional type. In this case, the group 575 of electrical contacts are switched 90 as to receive only the open len~-stop value data of the conventi~nal photographing lens (Step 654). Thus~ AE control is carried out as in the prior art.
On the contrary, in the case where Sl is a "l"t the CPU 591 judges that the photographing lens mounted on the camer~ body has an AF capability. In this caset "1"
~2~
is applied to ~he. D-inl?ut termina:L of the Eirst D :EF 621 in each of th~ selec-tive, switching circuits 610 relatin~
to the electrical contacts 575a, 575b and 575c, so,that Q
and Q ar~ se~ to "1" and "0", respectively. At this time, the output buf~er 625 is placed in the ON stateJ and the input buffer 627 in the OFF state so that the respective electrical contacts 575a, 575b'and 575c in the electrical contact group 575 function as exclusive contacts for transmitting different data. Accordingly, communication with the outside circuit can be carried out (Step 655).
The operation of the above-described camera body with an excll~sive photographing lens having an AF
capability of the type shown in Fig. 9 has already been discussed above with respect to Fig. 12. The operation of the inventiv,e camera body with a conventional photographing lens mounted on the camera body of the invention will now be considered.
Fi~. 17 is a block diagram showing a conventional photographing lens 415 attached to the camera body 501 of ' the invention.
In such an arrangement, an electrical contact corresponding to the identiEication electrical contact 577 of the camera body 501 is not provided on the conventional photographing len~ 415, and hence the electrical contact 577 is directly in touch with themount 417 of the .
. .
- ' ~ ' - , ' - ' : :
~2~
1 conventional photographing lens 415. Accordingly, the contact 577 is grounded so that the voltage at the contact 577 is at a low lev~l. When the voltaye at the contact 577 is a_ a low level, the CPU 591 is not operative under S automatic-focusing photographing control. Further, when the voltage at the identification electrical contact 577 is at a- low level~ the change-over circuit 610 in the controller 505 operates to apply the voltages at each of the electrical contacts 575a, 575b and 575c to the controller 505.
On the other hand, the conventional photdgraphing lèns 415 is pretrea~ed at each of the electrical contacts 421b, 422b and 423b so that some `contacts are ~oated with an insulating nraterial and some contacts are connected to the mount. Acc:ordingly, when a source voltage of the CPU
591 is applied to the body-side contacts 575a, 575b and 5~5c, the voltages at the body-side contacts 575a, 575b and 575c are respectively determined corresponding. to whether the contacts 421b, 422b and 423b are electrically 2~ insulated ~open~ or whether the contacts are grounded.
Thus, the open lens-stop value data of the photoyraphing lens is transmitted from the photographing lens to the controller g05 corresponding to the combination of the voltage states.
~ ' , , - .
.
1 Further, the minimum lens-stop value is transmitted throug~l the ~airs of contacts 4~4b and 579a, and 425b and 579b. Also, the data for selecting between automatic exposure control mode and manual exposure control mode is set by whether or not the contact 431b ls in touch with the contact 581. These data are applied to the controller 505 of the camera body 501.
According to the aforementioned construction, AE
photographing operations can be carried out even in the case where the conventional ~hotographing lens is mounted on the camer~. body of the invention having an A~
capability.
- As is apparent from the-above description, the camera body of the present invention .incorporates an identification electrical contact to automatically de~ermine whethYr the camera lens mounted on the camera body has an automatic ~ocusing capability or not.
Purther, necessary data transmission can be made through the elsctrical contact group in accordance with the type of the photographing len~, that is, whether or not the photographing lens has an automatic focusing capability.
Accordinglyr when an exclusive photographing lens having an AF capabilit~ is mounted on the ~amera body, photographing in either the AF or AE mode can be per~ormed. On the other handl when a convention~.l :, . , ' ' .................... . ' .
., ~8~6~7 1 photosraphing lens is mounted on the camera body, ph~tog~aphing in the AE made can be carried out in the same manner as in the prior art.
r~ herefore, the invention provides a camera body having interchangeability such that it can use both an exclusive photographing lens having an A~ capability and a conventi:onal ph~to~raphing lens without sacrificing the AE
capability.
.
Claims (33)
1. A camera capable of being used with a plurality of types of interchangeable photographing lens means, comprising:
a camera body having a first mount for mounting photographing lens means to said body:
a first electrical contact;
means coupled to said first electrical contact for detecting whether a photographing lens means mounted on said mount has an automatic focusing capability;
a first group of electrical contacts for coupling signals between said photographing lens means and said camera body; and means for transmitting via said first group of electrical contacts a single datum from said photographing lens means to said camera body in a parallel mode when said detecting means detects that said lens has no automatic focusing capability and transmitting and receiving a plurality of different data in a series mode when said detecting means detects that said photographing lens means has an automatic focusing capability.
a camera body having a first mount for mounting photographing lens means to said body:
a first electrical contact;
means coupled to said first electrical contact for detecting whether a photographing lens means mounted on said mount has an automatic focusing capability;
a first group of electrical contacts for coupling signals between said photographing lens means and said camera body; and means for transmitting via said first group of electrical contacts a single datum from said photographing lens means to said camera body in a parallel mode when said detecting means detects that said lens has no automatic focusing capability and transmitting and receiving a plurality of different data in a series mode when said detecting means detects that said photographing lens means has an automatic focusing capability.
2. The camera of claim 1, wherein power for actuating a photographing lens means having an automatic focusing capability mounted on said first mount is supplied via said first contact.
3. The camera of claim 1, wherein said first electrical contact and said first group of electrical contacts are provided on said first mount and at least said first electrical contact protrudes from a surface of said first mount.
4. The camera of claim 2, wherein said first electrical contact and said first group of electrical contacts are provided on said first mount and at least first electrical contact and protrudes from a surface of said first mount.
5. A camera capable of being used with a plurality of types of interchangeable photographing lens means, comprising:
a camera body having a first mount for mounting photographing lens means to said body;
a first electrical contact on said first mount;
means coupled to said first electrical contact for detecting whether a photographing lens means mounted on said mount has an automatic focusing capability;
a first group of electrical contacts on said first mount for coupling signals between said photographing lens means and said camera body;
means for transmitting via said first group of electrical contacts a single datum from said photographing lens means to said camera body in a parallel mode when said detecting means detects that said lens has no automatic focusing capability and transmitting and receiving a plurality of different data in a series mode when said detecting means detects that said photographing lens means has an automatic focusing capability; and automatic photographing lens means comprising:
a lens system freely movable for automatic focusing;
memory means for storing characterizing data of said lens system;
a second mount engageable with said first mount of said camera body;
a second electrical contact for supplying power to said memory means, said second electrical contact being provided on said second mount at a position corresponding to that of said first contact: and a second group of electrical contacts provided on said second mount at positions corresponding to those of respective ones of said contacts of said first group of contacts, said contacts of said second group of contacts being connected to respective data terminals of said memory means.
a camera body having a first mount for mounting photographing lens means to said body;
a first electrical contact on said first mount;
means coupled to said first electrical contact for detecting whether a photographing lens means mounted on said mount has an automatic focusing capability;
a first group of electrical contacts on said first mount for coupling signals between said photographing lens means and said camera body;
means for transmitting via said first group of electrical contacts a single datum from said photographing lens means to said camera body in a parallel mode when said detecting means detects that said lens has no automatic focusing capability and transmitting and receiving a plurality of different data in a series mode when said detecting means detects that said photographing lens means has an automatic focusing capability; and automatic photographing lens means comprising:
a lens system freely movable for automatic focusing;
memory means for storing characterizing data of said lens system;
a second mount engageable with said first mount of said camera body;
a second electrical contact for supplying power to said memory means, said second electrical contact being provided on said second mount at a position corresponding to that of said first contact: and a second group of electrical contacts provided on said second mount at positions corresponding to those of respective ones of said contacts of said first group of contacts, said contacts of said second group of contacts being connected to respective data terminals of said memory means.
6. The camera of claim 5, wherein said photographing lens means further comprises:
means for providing a single lens characterizing datum for said lens system; and switching means coupled to said second group of contacts for selecting one of a first transmission mode and a second transmission mode in response to a voltage on said second electrical contact, whereby in said first transmission mode a plurality of different data from said memory means are transmitted through said second group of contacts to said first group of contacts in a series mode in response to a control signal from said body, and in said second transmission mode said datum provided by said means for providing said single lens characterizing datum is transmitted through said second group of contacts to said first group of contacts.
means for providing a single lens characterizing datum for said lens system; and switching means coupled to said second group of contacts for selecting one of a first transmission mode and a second transmission mode in response to a voltage on said second electrical contact, whereby in said first transmission mode a plurality of different data from said memory means are transmitted through said second group of contacts to said first group of contacts in a series mode in response to a control signal from said body, and in said second transmission mode said datum provided by said means for providing said single lens characterizing datum is transmitted through said second group of contacts to said first group of contacts.
7. The camera of claim 6, wherein said characterizing datum is an open lens-stop value.
8. The camera of claim 5, wherein said second electrical contact projects from said surface of said second mount.
9. The camera of claim 6, wherein said second electrical contact projects from said surface of said second mount.
10. The camera of claim 6, wherein said switching means comprises a plurality of electronic switches having control electrodes connected to said second terminal.
11. The camera of claim 10, wherein said electronic switches comprise transistors, said transistors having collector-emitter paths connected between respective ones of said terminals of said second group of terminals and one of a ground point and an open point in accordance with a bit pattern of said single datum.
12. The camera of claim 6, wherein said switching means comprises diode means.
13. The camera of claim 6, wherein said switching means is incorporated in said memory means.
14. A photographing lens comprising:
a lens mount;
a memory means;
a plurality of electrical contacts provided on said lens mount and connected to respective data terminals of said memory means;
a control electrical contact provided on said mount, said control electrical contact being connected to an actuation terminal of said memory means;
means for providing a single lens-characterizing datum, and switching means for applying as determined by a voltage on said control electrical contact one of said single datum in a parallel mode and a series of data from said memory means to said plurality of electrical contacts.
a lens mount;
a memory means;
a plurality of electrical contacts provided on said lens mount and connected to respective data terminals of said memory means;
a control electrical contact provided on said mount, said control electrical contact being connected to an actuation terminal of said memory means;
means for providing a single lens-characterizing datum, and switching means for applying as determined by a voltage on said control electrical contact one of said single datum in a parallel mode and a series of data from said memory means to said plurality of electrical contacts.
15. The photographing lens of claim 14, wherein said control electrical contact projects from said mount.
16. The photographing lens of claim 14, wherein said switching means comprises a plurality of electronic switch means connected to respective ones of said plurality of electrical contacts and having control electrodes connected to said control electrical contact.
17. The photographing lens of claim 16, wherein said electronic switch means comprise transistors, said transistors having collector-emitter paths connected between respective ones of said plurality of electrical terminals and one of a ground point and an open point in accordance with a bit pattern of said single datum.
18. The photographing lens of claim 16, wherein said switching means comprises diode means.
19. The photographing lens of claim 16, wherein said switching means is incorporated in said read-only memory means.
20. The photographing lens of claim 14, wherein said single datum comprises an open lens-stop value.
21. The lens of claim 14, wherein said memory means is a read only memory.
22. The camera of claim 1 further comprising a third group of electrical contacts between said photographing lens means and said camera body, data representing a minimum lens-stop value being transmitted through said third group of electrical contacts to said camera body.
23. The camera of claim 1 further comprising a second electrical contact, data for changing over control between automatic exposure control mode and manual exposure control mode is transmitted through said second electrical contact.
24. A camera capable of being used with a plurality of types of interchangable photographing lens means, comprising:
a camera body having a first mount for mounting photographing lens means to said body;
a first electrical contact provided to a mount surface ;
means coupled to said first electrical contact for detecting whether a photographing lens means mounted on said mount has memory means for storing characteristic data of said photographing lens means;
a first group of electrical contacts for coupling signals between said photographing lens means and said camera body; and means for transmitting via said first group of contacts a single datum from said photographing lens means to said camera body in a parallel mode when said detecting means detects that said lens has no memory means and transmitting and receiving a plurality of different data in a series mode when said detecting means detects that said photographing lens means has said lens means.
a camera body having a first mount for mounting photographing lens means to said body;
a first electrical contact provided to a mount surface ;
means coupled to said first electrical contact for detecting whether a photographing lens means mounted on said mount has memory means for storing characteristic data of said photographing lens means;
a first group of electrical contacts for coupling signals between said photographing lens means and said camera body; and means for transmitting via said first group of contacts a single datum from said photographing lens means to said camera body in a parallel mode when said detecting means detects that said lens has no memory means and transmitting and receiving a plurality of different data in a series mode when said detecting means detects that said photographing lens means has said lens means.
25. The camera of claim 1, wherein power for actuating said memory means in said photographing lens means is supplied via said first contact.
26. The camera of claim 24, wherein said first electrical contact and said first group of electrical contacts are provided on said first mount and at least said first electrical contact protrudes from a surface of said first mount.
27. The camera of claim 25, wherein said first electrical contact and said first group of electrical contacts are provided on said first mount and at least said first electrical contact protrudes from a surface of said first mount.
28. A photographing lens comprising:
a lens system including an automatically focusing movable lens;
a lens mount having a mount surface;
memory means;
a plurality of electrical contacts provided on the mount surface of said lens mount and connected to respective data terminals of said memory means; and a first electrical contact provided on and projecting from the mount surface of said lens mount, to which electric power is supplied from a camera body to drive said memory means if said camera body is of an automatic focusing type.
a lens system including an automatically focusing movable lens;
a lens mount having a mount surface;
memory means;
a plurality of electrical contacts provided on the mount surface of said lens mount and connected to respective data terminals of said memory means; and a first electrical contact provided on and projecting from the mount surface of said lens mount, to which electric power is supplied from a camera body to drive said memory means if said camera body is of an automatic focusing type.
29. The lens of claim 28, wherein said memory means is read only memory in which lens characteristic data is stored.
30. The lens of claim 28, wherein said first electrical contact is grounded through a lens mount of said camera body if said camera body is not of the automatic focusing type, such that said photographing lens is capable of operating with said camera body irrespective of whether said camera body is of the automatic focusing type.
31. The lens of claim 28, wherein said first electrical contact indicates to said camera body whether said photographic lens is of an automatic focusing type.
32. A camera having a camera body capable of being used with a plurality of types of interchangeable photographing lenses, said camera body comprising:
a first mount , having a mount surface, for mounting a photographing lens to said camera body;
a first group of electrical contacts for coupling signals between said photographing lens and said camera body, said first group of electrical contacts being provided on a mount surface of said first mount;
a first electrical contact provided on and projecting from the mount surface of said first mount, through which electrical power is transmitted to said photographing lens; and means, coupled to said first electrical contact, for detecting whether said photographing lens is of an automatic focusing type.
a first mount , having a mount surface, for mounting a photographing lens to said camera body;
a first group of electrical contacts for coupling signals between said photographing lens and said camera body, said first group of electrical contacts being provided on a mount surface of said first mount;
a first electrical contact provided on and projecting from the mount surface of said first mount, through which electrical power is transmitted to said photographing lens; and means, coupled to said first electrical contact, for detecting whether said photographing lens is of an automatic focusing type.
33. The camera of claim 32, wherein said first electrical contact is grounded when said photographing lens is not of the automatic focusing type, said camera being capable of operating irrespective of whether said photographing lens is of the automatic focusing type.
33. The camera of claim 32, said photographing lens comprising an automatic photographing lens which in turn comprises:
a lens system including an automatically focusing movable lens;
memory means;
a second mount having a mount surface engageable with said mount surface of said first mount of said camera body;
a second group of electrical contacts provided on said mount surface of second mount at positions corresponding to those of respective ones of said first group of electrical contacts, said second group of electrical contacts being connected to respective data terminals of said memory means; and a second electrical contact, provided on and projecting from said mount surface of said second mount at a position corresponding to that of said first contact, for receiving electric power supplied from said first electrical contact on said mount surface of said mount of said camera body to drive said memory means.
35. The camera of claim 34, wherein said camera body further comprises means for transmitting through said first and second group of contacts a single datum from said photographing lens thereto in a parallel mode when said detecting means detects that said lens is not of the automatic focusing type, and wherein said means for transmitting transmits and receive through said first and second groups of electrical contacts, a plurality of different data in a series mode when said detecting means detects that said photographing lens is of the automatic focusing type.
36. The camera of claim 34, wherein said second electrical contact is grounded when said camera body is not of the automatic focusing type, said automatic photographing lens being capable of operating irrespective of whether said photographic lens means is of the automatic focusing type.
33. The camera of claim 32, said photographing lens comprising an automatic photographing lens which in turn comprises:
a lens system including an automatically focusing movable lens;
memory means;
a second mount having a mount surface engageable with said mount surface of said first mount of said camera body;
a second group of electrical contacts provided on said mount surface of second mount at positions corresponding to those of respective ones of said first group of electrical contacts, said second group of electrical contacts being connected to respective data terminals of said memory means; and a second electrical contact, provided on and projecting from said mount surface of said second mount at a position corresponding to that of said first contact, for receiving electric power supplied from said first electrical contact on said mount surface of said mount of said camera body to drive said memory means.
35. The camera of claim 34, wherein said camera body further comprises means for transmitting through said first and second group of contacts a single datum from said photographing lens thereto in a parallel mode when said detecting means detects that said lens is not of the automatic focusing type, and wherein said means for transmitting transmits and receive through said first and second groups of electrical contacts, a plurality of different data in a series mode when said detecting means detects that said photographing lens is of the automatic focusing type.
36. The camera of claim 34, wherein said second electrical contact is grounded when said camera body is not of the automatic focusing type, said automatic photographing lens being capable of operating irrespective of whether said photographic lens means is of the automatic focusing type.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP234141/86 | 1986-10-01 | ||
| JP61234141A JP2543681B2 (en) | 1986-10-01 | 1986-10-01 | Shooting lens |
| JP61265738A JPH0656468B2 (en) | 1986-11-10 | 1986-11-10 | Information transmission method and camera body in camera system |
| JP265738/86 | 1986-11-10 | ||
| JP15509/87 | 1987-01-26 | ||
| JP1987015509U JPS63124231U (en) | 1987-02-06 | 1987-02-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1288627C true CA1288627C (en) | 1991-09-10 |
Family
ID=27281036
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000548365A Expired - Lifetime CA1288627C (en) | 1986-10-01 | 1987-10-01 | Camera having interchangeable lenses |
Country Status (6)
| Country | Link |
|---|---|
| US (2) | US4841322A (en) |
| EP (1) | EP0262679B1 (en) |
| KR (1) | KR960005186B1 (en) |
| AU (1) | AU600033B2 (en) |
| CA (1) | CA1288627C (en) |
| DE (1) | DE3786736T2 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU594526B2 (en) * | 1986-11-06 | 1990-03-08 | Asahi Kogaku Kogyo Kabushiki Kaisha | Rear converter for interchangeable lens camera |
| US4914464A (en) * | 1988-02-08 | 1990-04-03 | Olympus Optical Co., Ltd. | Focussing apparatus for camera with zoom lens |
| US5214464A (en) * | 1988-02-29 | 1993-05-25 | Minolta Camera Kabushiki Kaisha | Camera system |
| KR0135082B1 (en) * | 1988-04-28 | 1998-04-20 | 오가 노리오 | Information storage apparatus and method |
| JP2921867B2 (en) * | 1988-07-20 | 1999-07-19 | 旭光学工業株式会社 | Camera focus detection device |
| JP2773144B2 (en) * | 1988-08-05 | 1998-07-09 | ミノルタ株式会社 | Camera with zoom lens |
| JP2791667B2 (en) * | 1988-08-30 | 1998-08-27 | 旭光学工業株式会社 | Photographic lens, camera body, and single-lens reflex camera system |
| US5255043A (en) * | 1988-08-30 | 1993-10-19 | Asahi Kogaku Kogyo Kabushiki Kaisha | Apparatus for maintaining constant image magnification in a camera system |
| DE68923506T2 (en) * | 1988-09-13 | 1996-03-28 | Asahi Optical Co Ltd | Single-lens reflex camera system. |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4464034A (en) * | 1981-11-13 | 1984-08-07 | Nippon Kogaku K.K. | Device for electrically connecting lens and camera |
| US4437752A (en) * | 1981-11-28 | 1984-03-20 | Canon Kabushiki Kaisha | Safety device for camera and accessory |
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| DE3227404A1 (en) * | 1982-07-22 | 1984-01-26 | Ernst Leitz Wetzlar Gmbh, 6330 Wetzlar | METHOD AND DEVICES FOR TRANSMITTING INFORMATION |
| SE443457B (en) * | 1983-03-10 | 1986-02-24 | Hasselblad Ab Victor | SYSTEM CAMERA DEVICE |
| JPS59188622A (en) * | 1983-04-08 | 1984-10-26 | Minolta Camera Co Ltd | Intermediate accessory for camera |
-
1987
- 1987-09-30 KR KR1019870010894A patent/KR960005186B1/en not_active IP Right Cessation
- 1987-10-01 CA CA000548365A patent/CA1288627C/en not_active Expired - Lifetime
- 1987-10-01 AU AU79265/87A patent/AU600033B2/en not_active Expired
- 1987-10-01 DE DE87114363T patent/DE3786736T2/en not_active Expired - Lifetime
- 1987-10-01 EP EP87114363A patent/EP0262679B1/en not_active Expired - Lifetime
-
1988
- 1988-11-01 US US07/266,328 patent/US4841322A/en not_active Expired - Lifetime
-
1989
- 1989-04-21 US US07/341,176 patent/US4945376A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| AU7926587A (en) | 1988-04-14 |
| KR960005186B1 (en) | 1996-04-22 |
| KR880005484A (en) | 1988-06-29 |
| EP0262679B1 (en) | 1993-07-28 |
| US4945376A (en) | 1990-07-31 |
| DE3786736D1 (en) | 1993-09-02 |
| US4841322A (en) | 1989-06-20 |
| EP0262679A3 (en) | 1988-11-30 |
| DE3786736T2 (en) | 1993-12-23 |
| EP0262679A2 (en) | 1988-04-06 |
| AU600033B2 (en) | 1990-08-02 |
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Legal Events
| Date | Code | Title | Description |
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| MKEX | Expiry |