CN102288209A - Method for positioning rotating position of character wheel and metering device thereby - Google Patents
Method for positioning rotating position of character wheel and metering device thereby Download PDFInfo
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- CN102288209A CN102288209A CN2010102066838A CN201010206683A CN102288209A CN 102288209 A CN102288209 A CN 102288209A CN 2010102066838 A CN2010102066838 A CN 2010102066838A CN 201010206683 A CN201010206683 A CN 201010206683A CN 102288209 A CN102288209 A CN 102288209A
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Abstract
The invention relates to a method for positioning the rotating position of a character wheel and a metering device thereby. The metering device with an optical sensing counting character wheel comprises at least one group of character wheel assembly, wherein the character wheel assembly comprises a character wheel bracket, a cylindrical character wheel body and a microprocessor unit (MCU); and each group of optical sensor assembly comprises an optical receiving pipe as well as a first optical emitting pipe and a second optical emitting pipe with emitting light rays over against the optical receiving pipe. The optical sensor assembly outputs four state signals which are applied in the same coding design; the number of the optical sensor assembly is smaller than that of the optical sensor in the prior art, and the manufacture cost of the metering device is reduced; meanwhile, the optical sensor assembly can confirm the rotating direction of the character wheel body and prevent a reading error caused by character wheel body reversal.
Description
Technical field
The present invention relates to realize the measuring apparatus of counting and definite method of character wheel position of rotation, particularly relate to by optical sensor and determine the method for character wheel position of rotation and use the measuring apparatus of this method with character wheel.
Background technology
The measuring apparatus that prior art is counted with the character wheel realization, for example water meter, ammeter, gas meter etc. comprise at least one character wheel assembly, each character wheel assembly is used for showing the one-bit digital of metering reading.Described character wheel assembly comprises even character wheel body that character code is arranged and the character wheel support that is used to support this character wheel body of marking on the cylinder.In order to solve cost of labor and the low problem of meter reading efficiency that manual metering brings, prior art also is provided for detecting the pick-up unit and the data processing equipment of character wheel position of rotation in described character wheel assembly, can between character wheel position of rotation and the character code reading of reading by the reading window of measuring apparatus, set up relation one to one by this pick-up unit and data processing equipment, thereby realize the automatic meter reading of measuring apparatus, and realize remote meter reading by building network.Optical sensor is a kind of described pick-up unit commonly used of prior art, when using described optical sensor, also need on described character wheel body, at least one optical transmission window be set, can make optical sensor output two states by this optical transmission window, i.e. status information and optical transmission window not the status information by optical sensor of optical transmission window by optical sensor.The quantity and the position of optical transmission window rationally are set, and the quantity of optical sensor and position, just can determine a group coding, and then determine the position of rotation of described character wheel body according to this group coding by the output state of gathering each optical sensor.
Prior art realizes the measuring apparatus of character wheel automatic reading is also existed following defective and weak point with the light sensing principle:
1. the prior art optical sensor comprises a light-emitting tube and a light receiving tube, therefore, this optical sensor can only be exported two states, be that light receiving tube receives from the state of the light of light-emitting tube and light receiving tube and do not receive state from the light of light-emitting tube, optical sensor can only corresponding binary-coded one, can not adapt to comparatively complicated code Design needs, and prior art occurs misalignment in order to prevent to the character wheel automatic reading, and the false readings situation that occurs because of character wheel counter-rotating, often be forced to design comparatively complicated coding;
2. as mentioned above, an optical sensor can only be exported two states, and can not reflect the character wheel sense of rotation; Because of the character wheel counter-rotating causes the problem of error in reading is the major issue that the present measuring apparatus that designs described character wheel automatic reading need solve; Prior art is mostly by the complicated code system of design, Gray code for example, whether the sense of rotation of differentiating character wheel is correct, the coding more complicated that this method forms, and in order to realize this code system, also need optical sensor and optical transmission window position and quantity are separately made special design, for example, a plurality of optical transmission windows and a plurality of optical sensor and strict their angle relations between mutually that limits are set, even the optical transmission window of two groups or more different radii need be set, thereby increased the design cost of described measuring apparatus, also reduced the physical strength that character wheel itself can bear;
3. the light-emitting tube of prior art optical sensor must keep illuminating state, even the character wheel body does not rotate, described light-emitting tube still needs to light, and causes energy loss; Though it is very little to light the electric energy of needs of light-emitting tube, but be installed in the described measuring apparatus of field or rugged surroundings for some, needs use battery that this measuring apparatus is powered and reach the effect of as far as possible not changing battery in the lifetime of described measuring apparatus, therefore, saving power consumption also is a major issue that needs solution to described measuring apparatus.
Summary of the invention
The technical problem to be solved in the present invention is to avoid the deficiencies in the prior art part and proposes a kind of measuring apparatus of character wheel to determine the showing method of character code and to use the configuration light sensing gauge digit wheel that this method makes that be used for accurately locating, change the configuration and the working method thereof of traditional photo sensor, simplify the coded system that realizes the character wheel automatic reading, improve the automatic reading accuracy, and solve the false readings problem that the character wheel counter-rotating causes.
The present invention solve the technical problem can be by realizing by the following technical solutions:
Design, a kind of measuring apparatus that disposes light sensing gauge digit wheel of manufacturing, comprise at least one group of character wheel assembly, described character wheel assembly comprises that uniform labelling on character wheel support, the cylinder has the cylindric character wheel body of N character code, at least one group of optical sensor components and microprocessor MCU, wherein, and N 〉=2.Described character wheel body is provided with the optical transmission window that at least one runs through this character wheel body vertically.Described optical sensor components is realized state variation by optical transmission window, and described microprocessor MCU gathers the different conditions of each optical sensor components and encodes to determine the position of rotation of character wheel body.Especially, every group of described optical sensor components comprises a light receiving tube, and penetrates first light-emitting tube and second light-emitting tube that light all faces this light receiving tube; Described light receiving tube and first, second light-emitting tube are separately positioned on the outside of character wheel body both ends of the surface.The normality that described each first, second light-emitting tube all is in each self-gravitation or lights.Described each first light-emitting tube of microprocessor MCU control changes their normalities separately successively, and detects the state change whether each light receiving tube receives corresponding separately first light-emitting tube, thereby forms first code set; Subsequently, each second light-emitting tube of this microprocessor MCU control changes their normalities separately successively, and detects the state change whether each light receiving tube receives corresponding separately second light-emitting tube, thereby forms second code set.Described microprocessor MCU determines the position of rotation of character wheel body according to first code set and second code set, promptly determines the reading that this character wheel body shows by the reading window.
Described character wheel body is provided with an optical transmission window, and the window angle φ of this optical transmission window is
Degree; Described window angle φ is meant the maximum central angle that forms between perpendicular to the orthogonal projection on the plane of this character wheel body axis along character wheel body sense of rotation two boundary surfaces of described optical transmission window.Described character wheel assembly is provided with
The group optical sensor components, function INT[x] expression get variable x integral part; In every group of described optical sensor group, on plane perpendicular to described character wheel body axis, the orthogonal projection that first light-emitting tube and second light-emitting tube form lays respectively at the both sides of the orthogonal projection place radial line of light receiving tube, and the interval of first between the orthogonal projection of the orthogonal projection of described first light-emitting tube and described second light-emitting tube central angle alpha satisfies
Described
Between the individual light receiving tube second central angle β at interval is
Degree; Described second at interval central angle β be meant the central angle that adjacent two light receiving tubes form between perpendicular to the orthogonal projection on the plane of this character wheel body axis.The center of circle of described central angle is meant that described character wheel body axis is perpendicular to the orthogonal projection on the plane of this character wheel body axis.
In every group of described optical sensor group, on the plane perpendicular to described character wheel body axis, be axis of symmetry with the orthogonal projection place radial line of light receiving tube, the orthogonal projection of the orthogonal projection of first light-emitting tube and second light-emitting tube is symmetrical arranged.
For improving the automatic reading accuracy, the described first interval central angle alpha also satisfies
Degree.
The present invention solve the technical problem can be by realizing by the following technical solutions:
Implement a kind of method of character wheel that be used for accurately locating with definite demonstration character code, measuring apparatus based on configuration light sensing gauge digit wheel, affiliated measuring apparatus comprises at least one group of character wheel assembly, described character wheel assembly comprises that uniform labelling on character wheel support, the cylinder has the cylindric character wheel body and the microprocessor MCU of N character code, wherein, N 〉=2.Described method comprises the steps:
A. on described character wheel body, offer the optical transmission window that at least one runs through this character wheel body vertically;
B., at least one group of optical sensor components is set, and by described optical transmission window, described each optical sensor components is realized state variation, and described microprocessor MCU gathers the different conditions of each optical sensor components and encodes to determine the position of rotation of character wheel body;
Especially,
C. be light receiving tube of every group of described optical sensor components configuration, and penetrate first light-emitting tube and second light-emitting tube that light all faces this light receiving tube; Described light receiving tube and first, second light-emitting tube are separately positioned on the outside of character wheel body both ends of the surface; Described each first, second light-emitting tube all is in and often goes out separately or the normality of Chang Liang;
D. described each first light-emitting tube of microprocessor MCU control changes their normalities separately successively, and detects the state change whether each light receiving tube receives each self-corresponding first light-emitting tube, thereby forms first code set;
E. described each second light-emitting tube of microprocessor MCU control changes their normalities separately successively, and detects the state change whether each light receiving tube receives corresponding separately second light-emitting tube, thereby forms second code set;
F. described microprocessor MCU determines the position of rotation of character wheel body according to first code set and second code set, promptly determines the reading that this character wheel body shows by the reading window.
Described step F comprises step by step following:
F1. described microprocessor MCU is first code set and second code set relatively, have only when described first code set and second code set are identical, determine the position of rotation of described character wheel body again according to the identical coding of two code set, promptly determine the reading that this character wheel body shows by the reading window.
In steps A, on described character wheel body, offer an optical transmission window, and make the window angle φ of this optical transmission window be
Degree; Described window angle φ is meant the maximum central angle that forms between perpendicular to the orthogonal projection on the plane of this character wheel body axis along character wheel body sense of rotation two boundary surfaces of described optical transmission window.In step B, be provided with
The group optical sensor components, function INT[x] expression get variable x integral part.In step C, the position of described light receiving tube, first light-emitting tube and second light-emitting tube is set, in every group of described optical sensor group, on plane perpendicular to described character wheel body axis, the orthogonal projection that first light-emitting tube and second light-emitting tube form lays respectively at the both sides of the orthogonal projection place radial line of light receiving tube, and the interval of first between the orthogonal projection of the orthogonal projection of described first light-emitting tube and described second light-emitting tube central angle alpha satisfies
Simultaneously, be provided with described
Between the individual light receiving tube second central angle β at interval is
Degree; Described second at interval central angle β be meant the central angle that adjacent two light receiving tubes form between perpendicular to the orthogonal projection on the plane of this character wheel body axis.The center of circle of described central angle is meant that described character wheel body axis is perpendicular to the orthogonal projection on the plane of this character wheel body axis.
In described step C, every group of described optical sensor group on the plane perpendicular to described character wheel body axis, is axis of symmetry with the orthogonal projection place radial line of light receiving tube, and the orthogonal projection of the orthogonal projection of first light-emitting tube and second light-emitting tube is symmetrical arranged.For improving the automatic reading accuracy, in described step C, the described first interval central angle alpha also satisfies
Degree.
Compare with prior art, the present invention's's " measuring apparatus that is used to locate the method for character wheel position of rotation and uses this method " technique effect is:
1. optical sensor components of the present invention comprises a light receiving tube and two light-emitting tubes, one group of this optical sensor components just can be exported four kinds of status signals, the state that the state of comprise the state of only being received by light receiving tube from the light of first light-emitting tube, the state of only being received by light receiving tube from the light of second light-emitting tube, being received from the light of two light-emitting tubes by light receiving tube and light receiving tube do not receive light; Be applied in the same code Design, the quantity of described optical sensor components will be less than the quantity of using the prior art optical sensor, reduce the manufacturing cost of measuring apparatus;
2. receive the sequencing of the light of two light-emitting tubes by light receiving tube in the judgement optical sensor components respectively, can determine the sense of rotation of character wheel body self, avoided the error in reading problem that causes because of the counter-rotating of character wheel body;
3. whether to receive the state of first light-emitting tube as initial code, whether to receive the state of second light-emitting tube as confirming coding, the accurate position of the corresponding character code reading of the state that initial code is identical with confirming coding, can simplify code Design greatly, make that an optical transmission window only is set just can realize accurate location to the character wheel position of rotation, also solved the false readings problem that misplaces the reading problem and reverse and cause because of character wheel simultaneously;
4. the present invention adopts polling mode to the state-detection of described optical sensor components, two light-emitting tubes do not need to be in normal bright state in the optical sensor components thereby make, saved the power consumption of described optical sensor components, for the life-span that prolongs in described measuring apparatus lowered in field environment or the rugged surroundings provides condition.
Description of drawings
Fig. 1 is the main synoptic diagram of looking of the present invention's " measuring apparatus that is used to locate the method for character wheel position of rotation and uses this method " optical sensor components 110 principle of work orthogonal projection;
Fig. 2 is that synoptic diagram is looked on optical sensor components of the present invention 110 principle of work orthogonal projection left sides;
Fig. 3 is optical sensor components 110 state-detection hardware connection diagrams of the present invention;
Fig. 4 is the main synoptic diagram of looking of the orthogonal projection of first embodiment of the invention;
Fig. 5 is that the character code of described first embodiment shows and the coding table of comparisons;
Fig. 6 is the main synoptic diagram of looking of the orthogonal projection of second embodiment of the invention.
Embodiment
Be described in further detail below in conjunction with the accompanying drawing illustrated embodiment.
The present invention proposes a kind of measuring apparatus that disposes light sensing gauge digit wheel, comprise at least one group of character wheel assembly 100, described character wheel assembly 100 comprises that uniform labelling on character wheel support, the cylinder has the cylindric character wheel body 120 of N character code, at least one group of optical sensor components 110 and microprocessor MCU 140, wherein, N 〉=2.Described character wheel body 120 is provided with at least one optical transmission window that runs through this character wheel body 120 vertically 121.Described optical sensor components 110 is realized state variation by optical transmission window 121, and described microprocessor MCU 140 gathers the different conditions of each optical sensor components 110 and encodes to determine the position of rotation of character wheel body.The quantity of described character wheel assembly 100 is determined that by concrete application demand promptly described measuring apparatus needs the figure place of video data, the one-bit digital in each character wheel assembly 100 corresponding shown data.
As depicted in figs. 1 and 2, every group of described optical sensor components 110 comprises a light receiving tube 111, and penetrates first light-emitting tube 112 and second light-emitting tube 113 that light all faces this light receiving tube 111.The light that on behalf of light-emitting tube, the dotted line among Fig. 2 send.Described light receiving tube 111 and first, second light-emitting tube 112,113 are separately positioned on the outside of character wheel body 120 both ends of the surface.Install for convenience, described light receiving tube 111 and two light-emitting tubes 112,113 all are installed on the described character wheel support.Described character wheel support is used to described character wheel body 120 that bearing is provided, and fixedly mounts whole character wheel assembly 100.Cooperate character wheel body 120 and go up the optical transmission window 121 that is provided with, described optical sensor components 110 can be exported four kinds of states, and Fig. 1 has embodied this four kinds of states.In Fig. 1, be provided with three optical transmission windows 121 and four groups of optical sensor components 110 on the described character wheel body 120, every group of optical sensor components 110 is in a kind of duty.Four kinds of output states of described optical sensor components 110 are respectively:
1. light receiving tube 111 is received the state from the light of two light-emitting tubes 112,113 simultaneously, as among Fig. 1 at dotted line O
1Z
10And O
1Z
11Folded regional Z
1In the output state of optical sensor components 110, the light that this moment, two light-emitting tubes 112,113 sent can pass through optical transmission window 121 directive light receiving tubes 111;
2. light receiving tube 111 is only received the state from the light of first light-emitting tube 112, as among Fig. 1 at dotted line O
1Z
20And O
1Z
21Folded regional Z
2In the output state of optical sensor components 110, the light that this moment, first light-emitting tube 112 sent can pass through optical transmission window 121 directive light receiving tubes 111, but the light that second light-emitting tube 113 sends is blocked by character wheel body 120;
3. light receiving tube 111 does not receive the state of light, as among Fig. 1 at dotted line O
1Z
30And O
1Z
31Folded regional Z
3In the output state of optical sensor components 110, the light that this moment, two light-emitting tubes 112,113 sent is all blocked by character wheel body 120;
4. light receiving tube 111 is only received the state from the light of second light-emitting tube 113, as among Fig. 1 at dotted line O
1Z
40And O
1Z
41Folded regional Z
4In the output state of optical sensor components 110, the light that this moment, second light-emitting tube 113 sent can pass through optical transmission window 121 directive light receiving tubes 111, but the light that first light-emitting tube 112 sends is blocked by character wheel body 120.
As shown in Figure 3, the present invention adopts the mode of poll to realize above-mentioned four kinds of status detection by microprocessor MCU 140.Suppose to be provided with in the character wheel assembly 100 M optical sensor components 110, each first light-emitting tube 112 is electrically connected the port T of microprocessor MCU 140 so
11, T
21..., T
M1, each second light-emitting tube 113 is electrically connected the port T of microprocessor MCU140
12, T
22..., T
M2, each light receiving tube 111 is electrically connected the port R of microprocessor MCU 140
1, R
2..., R
MAt first need to make described each first, second light-emitting tube 112,113 all to be in a kind of normality of extinguishing in state or the illuminating state separately.Consider from energy-conservation angle, described two light-emitting tubes 112,113 should be set to the state that often goes out.Therefore, below often be set to two light-emitting tubes 112,113 that the state of going out is an example description status testing process: described microprocessor MCU 140 each first light-emitting tube 112 of control change their normalities separately successively, i.e. microprocessor MCU's 140 successively to port T
11, T
21..., T
M1Send and light signal, each first light-emitting tube 112 is lighted successively, and microprocessor MCU 140 detection port R
1, R
2..., R
MState, promptly detect each light receiving tube 111 and whether receive the state of corresponding separately first light-emitting tube 112 from extinguishing to lighting and change, thereby form first code set; Certainly epicycle detects and finishes the normality that will recover each first light-emitting tube 112, and state promptly often goes out; Subsequently, each second light-emitting tube 113 of this microprocessor MCU 140 control change their normalities separately successively, i.e. microprocessor MCU's 140 successively to port T
12, T
22..., T
M2Send and light signal, each second light-emitting tube 113 is lighted successively, and microprocessor MCU 140 detects each light receiving tube 111 and whether receives the state change of corresponding separately second light-emitting tube 113 from extinguishing to lighting, thereby form second code set, same epicycle detects finishes the normality that will recover each second light-emitting tube 113, and state promptly often goes out.Described microprocessor MCU 140 determines the position of rotation of character wheel body 120 according to first code set and second code set, promptly determines the reading that this character wheel body 120 shows by the reading window.Obviously, be normal bright state if the normality of two light-emitting tubes 112,113 is set, the principle that can use above-mentioned poll equally realizes detecting the output state of optical sensor components 110.
Obviously, by judging the order of lighting of first light-emitting tube 112 and second light-emitting tube 113, just can know the sense of rotation of described character wheel body 120.
When being set to normal bright state with two light-emitting tubes 112,113 and being, the poll of described microprocessor MCU 140 and testing process are opposite with above-mentioned example, and this is conspicuous to those of ordinary skills, repeats no more herein.
The present invention realizes above-mentioned technology contents by the following method:
Implement a kind of method of character wheel that be used for accurately locating with definite demonstration character code, measuring apparatus based on above-mentioned configuration light sensing gauge digit wheel, described measuring apparatus comprises at least one group of character wheel assembly 100, described character wheel assembly 100 comprises that uniform labelling on character wheel support, the cylinder has the cylindric character wheel body 120 and the microprocessor MCU 140 of N character code, wherein, N 〉=2.Described method comprises the steps:
A. offer at least one optical transmission window that runs through this character wheel body 120 vertically 121 at described character wheel body 120;
B., at least one group of optical sensor components 110 is set, by described optical transmission window 121, described each optical sensor components is realized state variation, and described microprocessor MCU 140 gathers the different conditions of each optical sensor components 110 and encodes to determine the position of rotation of character wheel body;
C. be light receiving tubes 111 of every group of described optical sensor components 110 configurations, and penetrate first light-emitting tube 112 and second light-emitting tube 113 that light all faces this light receiving tube 111; Described light receiving tube 111 and first, second light-emitting tube 112,113 are separately positioned on the outside of character wheel body 120 both ends of the surface; Described each first, second light-emitting tube 112,113 all is in and often goes out separately or the normality of Chang Liang;
D. described microprocessor MCU 140 each first light-emitting tube 112 of control change their normalities separately successively, and detect the state change whether each light receiving tube 111 receives each self-corresponding first light-emitting tube 112, thereby form first code set;
E. described microprocessor MCU 140 each second light-emitting tube 113 of control change their normalities separately successively, and detect the state change whether each light receiving tube 111 receives corresponding separately second light-emitting tube 113, thereby form second code set;
F. described microprocessor MCU 140 determines the position of rotation of character wheel body 120 according to first code set and second code set, promptly determines the reading that this character wheel body 120 shows by the reading window.
Optical sensor components 110 of the present invention can be exported four kinds of states, is applied in the same code Design, and the quantity of described optical sensor components 110 will be less than the quantity of using the prior art optical sensor, has reduced the manufacturing cost of measuring apparatus; By judging that light receiving tube 111 in the optical sensor components receives the sequencing of the light of two light-emitting tubes 112,113 respectively, can determine the sense of rotation of character wheel body 120 self, avoided the error in reading problem that causes because of 120 counter-rotatings of character wheel body.
About optical transmission window 121 quantity and the position of offering on the described character wheel body 120, and can there be multiple scheme quantity and position that optical sensor components 110 is set, consider from the commercial Application angle, the present invention proposes some concrete technical schemes of simplifying the most, also be the minimum scheme of cost, but should be with following concrete scheme as unique qualification technical scheme of the present invention.
Consider that from the processing procedure of simplifying microprocessor MCU 140 above-mentioned steps F of the present invention can more specifically be following F1 step by step:
F1. described microprocessor MCU 140 is first code set and second code set relatively, have only when described first code set and second code set are identical, determine the position of rotation of described character wheel body 120 again according to the identical coding of two code set, promptly determine the reading that this character wheel body 120 shows by the reading window.
From simplifying character wheel assembly 100 configuration aspects, can realize character wheel body 120 is presented at display window the automatic reading of character code with minimum optical transmission window 121 and minimum optical sensor components 110.
Because N the distribution of character code on character wheel body 120 cylinders is uniformly, is equivalent in the process that rotates a circle of character wheel body 120, each character code has occupied
The anglec of rotation of degree, therefore, as Fig. 4 and shown in Figure 6, character wheel body 120 can be divided into N fan section perpendicular to the circular orthogonal projection on the axis plane, so as minimalist program, only be provided with an optical transmission window 121 on described character wheel body 120, this optical transmission window 121 should cover the minimum fan section that is no less than half, i.e. the fan section of optical transmission window 121 coverings should reach
Individual, function INT[x] the expression integral part of getting variable x, after promptly rounding up
Thus, the window angle φ of described optical transmission window 121 is
Degree; Described window angle φ is meant the maximum central angle that forms between perpendicular to the orthogonal projection on the plane of these character wheel body 120 axis along character wheel body 120 sense of rotation two boundary surfaces of described optical transmission window 121.
Adapt to the plan of establishment of above-mentioned optical transmission window 121, described character wheel assembly 100 is provided with
Group optical sensor components 110 is equivalent to each fan section of optical sensor components 110 corresponding detections, and the situation that all optical sensor components 110 are all covered by optical transmission window 121 can occur.Therefore, as Fig. 4 and shown in Figure 6, in every group of described optical sensor group 110, on plane perpendicular to described character wheel body 120 axis, the orthogonal projection that first light-emitting tube 112 and second light-emitting tube 113 form lays respectively at the both sides of the orthogonal projection place radial line of light receiving tube 111, and the interval of first between the orthogonal projection of the orthogonal projection of described first light-emitting tube 112 and described second light-emitting tube 113 central angle alpha satisfies
Described
Between the individual light receiving tube 111 second central angle β at interval is
Degree.Described second at interval central angle β be meant the central angle that adjacent two light receiving tubes 111 form between perpendicular to the orthogonal projection on the plane of these character wheel body 120 axis.The center of circle of described central angle is meant that described character wheel body 120 axis are perpendicular to the orthogonal projection on the plane of these character wheel body 120 axis.
In order to obtain quite good detecting effectiveness, in every group of described optical sensor group 110, on plane perpendicular to described character wheel body 120 axis, be axis of symmetry with the orthogonal projection place radial line of light receiving tube 111, the orthogonal projection of the orthogonal projection of first light-emitting tube 112 and second light-emitting tube 113 is symmetrical arranged.
If will reach best detection effect, should should be tried one's best in the zone between two light-emitting tubes 112,113 near the zone that reaches a fan section, the promptly described first interval central angle alpha also satisfies
Degree.
Technique scheme can also realize according to following method:
In steps A, on described character wheel body 120, offer an optical transmission window 121, and make the window angle φ of this optical transmission window 121 be
Degree.Described window angle φ is meant the maximum central angle that forms between perpendicular to the orthogonal projection on the plane of these character wheel body 120 axis along character wheel body 120 sense of rotation two boundary surfaces of described optical transmission window 121.
In step B, be provided with
The group optical sensor components 110, function INT[x] expression get variable x integral part.
In step C, the position of described light receiving tube 111, first light-emitting tube 112 and second light-emitting tube 113 is set, in every group of described optical sensor group 110, on plane perpendicular to described character wheel body 120 axis, the orthogonal projection that first light-emitting tube 112 and second light-emitting tube 113 form lays respectively at the both sides of the orthogonal projection place radial line of light receiving tube 111, and the interval of first between the orthogonal projection of the orthogonal projection of described first light-emitting tube 112 and described second light-emitting tube 113 central angle alpha satisfies
Degree.Simultaneously, be provided with described
Between the individual light receiving tube 111 second central angle β at interval is
Degree.Described second at interval central angle β be meant the central angle that adjacent two light receiving tubes 111 form between perpendicular to the orthogonal projection on the plane of these character wheel body 120 axis.The center of circle of described central angle is meant that described character wheel body 120 axis are perpendicular to the orthogonal projection on the plane of these character wheel body 120 axis.
In order to obtain quite good detecting effectiveness, in described step C, every group of described optical sensor group 110, on plane perpendicular to described character wheel body 120 axis, orthogonal projection place radial line with light receiving tube 111 is an axis of symmetry, and the orthogonal projection of the orthogonal projection of first light-emitting tube 112 and second light-emitting tube 113 is symmetrical arranged.
If will reach best detection effect, in described step C, the described first interval central angle alpha also satisfies
Degree.
As the character code number is the representative of even number, first embodiment of the invention, and as shown in Figure 4, character code is counted N=10, and character wheel body 120 is rotated counterclockwise along arrow RD direction indication, measuring apparatus reading window line segment S
1S
2Signal, reading visual angle such as arrow W indication, the shared central angle in the fan section that each with dashed lines separates is 36 °, therefore, is provided with 5 groups of optical sensor components, wherein, φ=180 °, 18 °＜α=30 °＜36 °, β=36 °.The center of circle of described central angle is O
2Every group of described optical sensor group 110 on the plane perpendicular to described character wheel body 120 axis, is axis of symmetry with the orthogonal projection place radial line of light receiving tube 111, and the orthogonal projection of the orthogonal projection of first light-emitting tube 112 and second light-emitting tube 113 is symmetrical arranged.Character wheel body 120 rotates a circle, from measuring apparatus reading window S
1S
2The character code of reading, first code set, second code set and character code are at the show state corresponding relation of window as shown in Figure 5.As shown in Figure 5, when having only first code set and second code set identical, could determine the character code of demonstration, the corresponding self-reading character code of the coding that two code set are identical, and in two code set not simultaneously, can determine the sense of rotation of character wheel body 120 by relatively encoding.And adopt the prior art optical sensor, and promptly replace optical sensor group 110 of the present invention with the prior art optical sensor, prior art can't reach accurate corresponding reading and determine the technique effect that the character wheel body turns to.
As the character code number is the representative of odd number, second embodiment of the invention, and as shown in Figure 6, character code is counted N=7, and character wheel body 120 is rotated counterclockwise along arrow RD direction indication, measuring apparatus reading window line segment S
3S
4Signal reading visual angle such as arrow W indication, the shared central angle in the fan section that each with dashed lines separates is 51.42 ° approximately, therefore, be provided with 4 groups of optical sensor components, wherein, 205.68 ° of φ ≈ 51.42 ° * 4 ≈, 25.71 °＜α=45.42 °＜51.42 °, 51.42 ° of β ≈.The center of circle of described central angle is O
3Every group of described optical sensor group 110 on the plane perpendicular to described character wheel body 120 axis, is axis of symmetry with the orthogonal projection place radial line of light receiving tube 111, and the orthogonal projection of the orthogonal projection of first light-emitting tube 112 and second light-emitting tube 113 is symmetrical arranged.
Claims (9)
1. measuring apparatus that disposes light sensing gauge digit wheel, comprise at least one group of character wheel assembly (100), described character wheel assembly (100) comprises that uniform labelling on character wheel support, the cylinder has cylindric character wheel body (120), at least one group of optical sensor components (110) and the microprocessor MCU (140) of N character code; Wherein, N 〉=2; Described character wheel body (120) is provided with at least one optical transmission window (121) that runs through this character wheel body (120) vertically; Described optical sensor components (110) is realized state variation by optical transmission window (121), and described microprocessor MCU (140) gathers the different conditions of each optical sensor components (110) and encodes to determine the position of rotation of character wheel body; It is characterized in that:
Every group of described optical sensor components (110) comprises a light receiving tube (111), and penetrates first light-emitting tube (112) and second light-emitting tube (113) that light all faces this light receiving tube (111); Described light receiving tube (111) and first, second light-emitting tube (112,113) are separately positioned on the outside of character wheel body (120) both ends of the surface;
The normality that described each first, second light-emitting tube (112,113) all is in each self-gravitation or lights; Each first light-emitting tube (112) of described microprocessor MCU (140) control changes their normalities separately successively, and detects the state change whether each light receiving tube (111) receives corresponding separately first light-emitting tube (112), thereby forms first code set; Subsequently, each second light-emitting tube (113) of this microprocessor MCU (140) control changes their normalities separately successively, and detect the state change whether each light receiving tube (111) receives corresponding separately second light-emitting tube (113), thereby form second code set; Described microprocessor MCU (140) determines the position of rotation of character wheel body (120) according to first code set and second code set, promptly determines the reading that this character wheel body (120) shows by the reading window.
2. the measuring apparatus of configuration light sensing gauge digit wheel according to claim 1 is characterized in that:
Described character wheel body (120) is provided with an optical transmission window (121), and the window angle φ of this optical transmission window (121) is
Degree; Described window angle φ is meant the maximum central angle that forms between perpendicular to the orthogonal projection on the plane of this character wheel body (120) axis along character wheel body (120) sense of rotation two boundary surfaces of described optical transmission window (121);
Described character wheel assembly (100) is provided with
The group optical sensor components (110), function INT[x] expression get variable x integral part; In every group of described optical sensor group (110), on plane perpendicular to described character wheel body (120) axis, the orthogonal projection that first light-emitting tube (112) and second light-emitting tube (113) form lays respectively at the both sides of the orthogonal projection place radial line of light receiving tube (111), and the interval of first between the orthogonal projection of the orthogonal projection of described first light-emitting tube (112) and described second light-emitting tube (113) central angle alpha satisfies
Degree; Described
Between the individual light receiving tube (111) second central angle β at interval is
Degree; Described second at interval central angle β be meant the central angle that adjacent two light receiving tubes (111) form between perpendicular to the orthogonal projection on the plane of this character wheel body (120) axis;
The center of circle of described central angle is meant that described character wheel body (120) axis is perpendicular to the orthogonal projection on the plane of this character wheel body (120) axis.
3. the measuring apparatus of configuration light sensing gauge digit wheel according to claim 2 is characterized in that:
In every group of described optical sensor group (110), on plane perpendicular to described character wheel body (120) axis, orthogonal projection place radial line with light receiving tube (111) is an axis of symmetry, and the orthogonal projection of the orthogonal projection of first light-emitting tube (112) and second light-emitting tube (113) is symmetrical arranged.
4. according to the measuring apparatus of claim 2 or 3 described configuration light sensing gauge digit wheels, it is characterized in that:
The described first interval central angle alpha also satisfies
Degree.
5. one kind is used for accurately locating character wheel to determine to show the method for character code, measuring apparatus based on configuration light sensing gauge digit wheel, described measuring apparatus comprises at least one group of character wheel assembly (100), and described character wheel assembly (100) comprises that uniform labelling on character wheel support, the cylinder has the cylindric character wheel body (120) and the microprocessor MCU (140) of N character code; Wherein, N 〉=2; Described method comprises the steps:
A. on described character wheel body (120), offer the optical transmission window (121) that at least one runs through this character wheel body (120) vertically;
B., at least one group of optical sensor components (110) is set, by described optical transmission window (121), described each optical sensor components is realized state variation, and described microprocessor MCU (140) gathers the different conditions of each optical sensor components (110) and encodes to determine the position of rotation of character wheel body;
It is characterized in that described method also comprises the steps:
C. be every group of described optical sensor components (110) configuration light receiving tube (111), and penetrate first light-emitting tube (112) and second light-emitting tube (113) that light all faces this light receiving tube (111); Described light receiving tube (111) and first, second light-emitting tube (112,113) are separately positioned on the outside of character wheel body (120) both ends of the surface; The normality that described each first, second light-emitting tube (112,113) all is in each self-gravitation or lights;
D. each first light-emitting tube (112) of described microprocessor MCU (140) control changes their normalities separately successively, and detect the state change whether each light receiving tube (111) receives each self-corresponding first light-emitting tube (112), thereby form first code set;
E. each second light-emitting tube (113) of described microprocessor MCU (140) control changes their normalities separately successively, and detects the state change whether each light receiving tube (111) receives corresponding separately second light-emitting tube (113), thereby forms second code set;
F. described microprocessor MCU (140) determines the position of rotation of character wheel body (120) according to first code set and second code set, promptly determines the reading that this character wheel body (120) shows by the reading window.
6. according to claim 5ly be used for accurately locating character wheel to determine to show the method for character code, it is characterized in that: described step F comprises step by step following:
F1. described microprocessor MCU (140) is first code set and second code set relatively, have only when described first code set and second code set are identical, determine the position of rotation of described character wheel body (120) again according to the identical coding of two code set, promptly determine the reading that this character wheel body (120) shows by the reading window.
7. according to claim 5ly be used for accurately locating character wheel, it is characterized in that to determine to show the method for character code:
In steps A, on described character wheel body (120), offer an optical transmission window (121), and make the window angle φ of this optical transmission window (121) be
Degree; Described window angle φ is meant the maximum central angle that forms between perpendicular to the orthogonal projection on the plane of this character wheel body (120) axis along character wheel body (120) sense of rotation two boundary surfaces of described optical transmission window (121);
In step B, be provided with
The group optical sensor components (110), function INT[x] expression get variable x integral part;
In step C, the position of described light receiving tube (111), first light-emitting tube (112) and second light-emitting tube (113) is set, in every group of described optical sensor group (110), on plane perpendicular to described character wheel body (120) axis, the orthogonal projection that first light-emitting tube (112) and second light-emitting tube (113) form lays respectively at the both sides of the orthogonal projection place radial line of light receiving tube (111), and the interval of first between the orthogonal projection of the orthogonal projection of described first light-emitting tube (112) and described second light-emitting tube (113) central angle alpha satisfies
Degree; Simultaneously, be provided with described
Between the individual light receiving tube (111) second central angle β at interval is
Degree; Described second at interval central angle β be meant the central angle that adjacent two light receiving tubes (111) form between perpendicular to the orthogonal projection on the plane of this character wheel body (120) axis;
The center of circle of described central angle is meant that described character wheel body (120) axis is perpendicular to the orthogonal projection on the plane of this character wheel body (120) axis.
8. according to claim 7ly be used for accurately locating character wheel, it is characterized in that to determine to show the method for character code:
In described step C, every group of described optical sensor group (110), on plane perpendicular to described character wheel body (120) axis, orthogonal projection place radial line with light receiving tube (111) is an axis of symmetry, and the orthogonal projection of the orthogonal projection of first light-emitting tube (112) and second light-emitting tube (113) is symmetrical arranged.
9. describedly be used for accurately locating character wheel according to claim 7 or 8, it is characterized in that to determine to show the method for character code:
In described step C, the described first interval central angle alpha also satisfies
Degree.
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| CN201010206683.8A CN102288209B (en) | 2010-06-19 | 2010-06-19 | Method for positioning rotating position of character wheel and metering device thereby |
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