CN101483376B - Voice coil motor - Google Patents
Voice coil motor Download PDFInfo
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- CN101483376B CN101483376B CN2008100016998A CN200810001699A CN101483376B CN 101483376 B CN101483376 B CN 101483376B CN 2008100016998 A CN2008100016998 A CN 2008100016998A CN 200810001699 A CN200810001699 A CN 200810001699A CN 101483376 B CN101483376 B CN 101483376B
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- coil
- magnetic
- winding body
- voice coil
- magnetic pole
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Abstract
The present invention discloses a speech coil motor, which comprises a permanent seat, a guide pole, a coil, a mounting seat and a magnetic element, wherein the guide pole is connected to the permanent seat; the coil comprises a first winding (zone) and a second winding (zone) relative to the coil, and the current direction are opposite; the mounting seat is set on the guide pole to provide it with movable connection mode; the magnetic element is connected on the mounting seat and is provided with a first magnetic pole and a second magnetic pole, wherein the first magnetic pole and the second magnetic pole is relative to the first winding (zone) and the second winding (zone) of the coil respectively; the first magnetic pole interacts with the first winding (zone) of the coil to generate the first acting force; the second magnetic pole interacts with the second winding (zone) of the coil to generate the second acting force. The first and the second acting force drive the mounting seat move.
Description
Technical field
The present invention relates to a kind of voice coil motor, particularly relate to the voice coil motor of a kind of miniaturization, high position precision, low manufacturing cost and low power consumption.
Background technology
Along with the progress of science and technology, the camera that is arranged in the mobile phone develops towards high image quality, the design direction of economizing the energy, low cost and miniaturization, and ordering about the actuating device that camera lens module wherein moves then is the key spare part that influences its product quality.
In being applied in the automatic displacement drive of small-sized camera lens module at present, its driver can roughly be divided into two kinds according to the direction of motion, first kind of driver can provide rotary power, and its rotating shaft is the optical axis that is parallel to camera lens module, second kind of driver then can provide translation power, and its moving direction is the optical axis that is parallel to camera lens module.
Rotatablely moving of first kind of driver (for example, stepper motor) needs extra transmission direction switching mechanism usually, so that camera lens module can be parallel to moving of optical axis.With regard to the automatic displacement drive that uses first kind of driver, its characteristics are not need to increase the position that extra electric power is kept camera lens module when camera lens module arrives the location.Yet the automatic displacement drive that contains first kind of driver can have very many constituent parts, and its complex structure degree is quite high, thereby is unfavorable for dwindling the volume of automatic displacement drive.
And second kind of driver (for example, voice coil motor, piezoelectric actuated device and liquid lens actuating device) can directly be applied in strength on the position adjustments.Compared to the automatic displacement drive of first kind of driver of utilization, the automatic displacement drive of second kind of driver of utilization can have less constituent part and smaller volume.Yet, the demand in the market that faces the future, how more effective dwindle this kind driver or automatically displacement drive size and improve its precision and be mostly an important topic.
Disclosing in No. the 200525859th, TaiWan, China patent disclosure has a kind of voice coil motor, and it mainly is to constitute a movable magnetic circuit component with two relative non-ring-like magnetites and a plurality of yoke group.The part magnetic line of force can be derived from the surface of non-ring-like magnetite, and reach in the magnetic conductive axis via the yoke group, between movable magnetic circuit component and magnetic conductive axis, producing radially suction (radially precompression), this radially suction only be to be used for making the movable magnetic circuit component can be more smooth and easy with respect to the slip of magnetic conductive axis.In addition, among this kind voice coil motor, the voice coil loudspeaker voice coil power between a coil and the non-ring-like magnetite produces has utilized the identical magnetic line of force of part direction or path.
See also Figure 1A and Figure 1B, disclosing in 2005-128405 number to disclose at Japan Patent has a kind of existing lens driving apparatus 1, it is by using the upper spring sheet 9 and lower spring sheet 11 of special design up and down, can provide that camera lens module 20 is accurate to be moved and reduce frictional force when mobile.Upper spring sheet 9 and lower spring sheet 11 also can be considered the extension of coil 15, with the conductor as coil 15 two ends current flowing.It should be noted that among lens driving apparatus 1 upper spring sheet 9 is to be used for providing axial precompression to camera lens module with lower spring sheet mostly 11, so that camera lens module can be positioned at a certain ad-hoc location smoothly when coil 15 energisings.Yet, because lens driving apparatus 1 must have and be used for the yoke 3 of magnetic conduction, so its overall dimensions and manufacturing cost can't effectively be reduced.
In M305361 number disclosed voice coil motor of TaiWan, China patent, the magnetizing direction of its permanet magnet magnetizes for " the two poles of the earth ", that is its permanet magnet magnetizing direction is vertical with its moving direction, with the permanet magnet that magnetize at these " the two poles of the earth ", reaches the purpose that improves the magnetic flux utilance.
In addition, Japan Patent disclose 2003-207708 number, Japan Patent discloses 2006-220776 number and the 5th, 220, No. 461 disclosed voice coil motors of United States Patent (USP) among, the magnetizing direction of permanet magnet is (that is permanet magnet by radial magnetizing) vertical with its moving direction.In order to improve the magnetic flux utilance of permanet magnet, can add magnetic conduction heel piece in the radial side of permanet magnet, so can be unfavorable for the miniaturization of voice coil motor.In addition, among these voice coil motors, in order to allow camera lens module can pass coil, the size that coil all is made into hollow ring and its hollow space is all very big.As mentioned above, the number of turns of coil can be restricted, thereby is unfavorable for the lifting of voice coil loudspeaker voice coil power.Moreover the bulk strength of coil can be not enough, thereby easily cause it to deform when assembling, and then easily cause the yield of voice coil motor to descend.
In addition, among No. the 200525859th, TaiWan, China patent disclosure and No. 176799 disclosed voice coil motor of TaiWan, China patent, the magnetizing direction of permanet magnet is (that is permanet magnet by axial charging) parallel with its moving direction.Moreover among these voice coil motors, coil is arranged between a plurality of permanet magnets and the magnetic conduction heel piece, and has two air gaps between moving-member and fixed part.An air gap is to be present between permanet magnet and the coil, and another air gap is to be present between magnetic conduction heel piece and the coil.In addition, guidance axis is made by magnetic conductive material, can have magnetic attraction between guidance axis and the permanet magnet, thereby still need that to consider voice coil motor be that the required starting current of frictional force when overcoming this axis hole slide relative increases, whether the number of turns of coil is restricted, and the periphery design that the cooperation coil is set of sensing element etc.
Summary of the invention
The objective of the invention is to provide a kind of voice coil motor, and it can reach the effect of miniaturization, high position precision, low manufacturing cost and low power consumption.
The object of the present invention is achieved like this, and a kind of voice coil motor promptly is provided, and it comprises a holder; At least one guide bar is connected in this holder; At least one coil, be connected in this holder, and have a coil first winding body (district) and a coil second winding body (district), wherein, this coil first winding body (district) connection reaches with respect to this coil second winding body (district), and the sense of current in this coil first winding body (district) and the current opposite in direction in this coil second winding body (district); One mount pad is located on this guide bar in the mode that moves; And at least one magnetic element, be connected in this mount pad, and have one first magnetic pole and one second magnetic pole, wherein, the magnetizing direction of this magnetic element is parallel to this mount pad and this motion of magnetic elements direction, and central shaft perpendicular to this coil, this first magnetic pole and this second magnetic pole are respectively with respect to this coil first winding body (district) and this coil second winding body (district) of this coil, this first magnetic pole and this coil first winding body (district) reciprocation and produce one first active force, this second magnetic pole and this coil second winding body (district) reciprocation and produce one second active force, and this first active force and this second active force order about this mount pad and this magnetic element and move according to the magnetizing direction of this magnetic element.
Simultaneously, according to voice coil motor of the present invention, this guide bar is by magnetic conductive material is not made.
Again in the present invention, this guide bar and this holder can be one-body molded.
Again in the present invention, more comprise a magnetic conduction heel piece, be arranged between this mount pad and this magnetic element.
Again in the present invention, more comprise a position sensor, be connected in this holder, and with respect to this magnetic element, in order to this motion of magnetic elements of sensing.
Again in the present invention, this position sensor comprises a Hall element, a reluctance sensing element, inductance survey element or a Photosensing Units.
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, preferred embodiment cited below particularly also cooperates appended accompanying drawing to elaborate.
Description of drawings
Figure 1A is the generalized section that shows a kind of existing lens driving apparatus;
Figure 1B is the perspective exploded view that shows according to the existing lens driving apparatus of Figure 1A;
Fig. 2 A is the perspective exploded view that shows the voice coil motor of the first embodiment of the present invention;
Fig. 2 B shows the voice coil motor of the first embodiment of the present invention and the solid combination schematic diagram of a camera lens module;
Fig. 3 is the generalized section that shows according to Fig. 2 B;
Fig. 4 shows the voice coil motor of the second embodiment of the present invention and the solid combination schematic diagram of a camera lens module; And
Fig. 5 is the solid combination schematic diagram that shows the voice coil motor of the third embodiment of the present invention.
The main element symbol description
1 magnetic head drive
3～yoke
9～upper spring sheet
11～lower spring sheet
15～coil
20～camera lens module
101,102,103,104～voice coil motor
110～holder
120～guide bar
130～coil
131～coil, the first winding body (district)
132～coil, the second winding body (district)
140～mount pad
141～open-work
150～magnetic element
151～the first magnetic poles
152～the second magnetic poles
160～magnetic conduction heel piece
170～position sensor
C
130～central shaft
F
1～the first active force
F
2～the second active force
L～camera lens module
O～optical axis
Embodiment
Now conjunction with figs. illustrates preferred embodiment of the present invention.
First embodiment
See also Fig. 2 A and Fig. 2 B, the camera lens module that the voice coil motor 101 of present embodiment can be applicable to order about a camera carries out zoom and moves, and mainly include a holder 110, two guide bars 120, two coils 130, a mount pad 140 and two magnetic elements 150, wherein, holder 110, guide bar 120 and coil 130 can be considered the fixed part of voice coil motor 101 ,-and mount pad 140 and magnetic element 150 can be considered the moving-member of voice coil motor 101.
Two guide bars 120 all are to be connected in holder 110.At this, two guide bars 120 all are by magnetic conductive material is not made.In addition, among present embodiment, guide bar 120 can be formed in one with holder 110.
Two coils 130 all are to be connected in holder 110.As Fig. 2 B and shown in Figure 3, each coil 130 has a coil first winding body (district) 131 and a coil second winding body (district) 132.Each coil first winding body (district) the 131st, connection reaches with respect to each coil second winding body (district) 132.It should be noted that, because coil first winding body (district) 131 and the coil second winding body (district) 132 have constituted the loop of coil 130, thus the sense of current in the coil first winding body (district) 131 be with the coil second winding body (district) 132 in current opposite in direction.
Still as Fig. 2 B and shown in Figure 3, two magnetic elements 150 all are to be connected in mount pad 140.Specifically, the magnetizing direction of each magnetic element 150 all is the moving direction that is parallel to mount pad 140 and each magnetic element 150, and the magnetizing direction of each magnetic element 150 is perpendicular to the central shaft C of each coil 130
130In addition, as shown in Figure 3, each magnetic element 150 has one first magnetic pole 151 and one second magnetic pole 152.First magnetic pole 151 and second magnetic pole 152 are respectively with respect to coil first winding body (district) 131 and the coil second winding body (district) 132 of coil 130.In addition, among present embodiment, magnetic element 150 can be a permanet magnet.
As mentioned above, the sealing magnetic line of force that provided of magnetic element 150 can vertical coil first winding body (district) 131 and the coil second winding body (district) 132 by coil 130.For instance, magnetic element 150 and coil 130 with the right-hand part among Fig. 3, first magnetic pole 151 of magnetic element 150 and second magnetic pole 152 are respectively the S utmost point and the N utmost point, coil first winding body (district) 131 of coil 130 and the sense of current in the coil second winding body (district) 132 are respectively to flow into and flow out, and vertically the direction of the magnetic line of force by the coil first winding body (district) 131 is opposite with the direction of the vertical magnetic line of force that passes through the coil second winding body (district) 132.Therefore, when coil 130 was passed into an electric current, according to the electromagnetic voice coil principle, first magnetic pole 151 can produce one first directed force F with coil first winding body (district) 131 reciprocations
1(that is the magnetic line of force that magnetic element 150 provided can be with electric current reciprocation in the coil first winding body (district) 131 and is produced one first directed force F
1), and second magnetic pole 152 can produce one second directed force F with coil second winding body (district) 132 reciprocations
2(that is the magnetic line of force that magnetic element 150 provided can be with electric current reciprocation in the coil second winding body (district) 132 and is produced one second directed force F
2).At this, first directed force F
1And second directed force F
2Direction be all identical.As mentioned above, in first directed force F
1And second directed force F
2Force action under, can order about mount pad 140 and magnetic element 150 and move according to the magnetizing direction of magnetic element 150.
Carry out zoom when moving at a camera lens module L who voice coil motor 101 is applied to order about a camera, its structure can be as Fig. 2 B and shown in Figure 3.Camera lens module L can be mounted 140 carryings of seat, and camera lens module L has an optical axis O.The magnetizing direction of magnetic element 150 is the direction that is parallel to optical axis O.At this moment, according to electromagnetic voice coil former comprehend produce first directed force F be parallel to optical axis O
1And second directed force F
2, and first directed force F
1And second directed force F
2Can order about with joint efforts camera lens module L, mount pad 140 and magnetic element 150 move along optical axis O direction (or magnetizing direction of magnetic element 150).
In addition, design guide bar 120 is by magnetic conductive material is not made, does not exist so do not have magnetic attraction between guide bar 120 and the magnetic element 150.So, when mount pad 140 moved on guide bar 120, its frictional force to each other can be very little, and the starting current that voice coil motor 101 is required to be used for overcoming the frictional force of 120 of mount pad 140 and guide bars reduces.
In addition, though the voice coil motor 101 of present embodiment is to have two coils 130 and two magnetic elements 150 are done explanation, but it also can only have a coil 130 and a magnetic element 150, and can reach the above-mentioned effect that mount pad 140 and magnetic element 150 move according to the magnetizing direction of magnetic element 150 of ordering about equally.
In addition, the voice coil motor 101 of present embodiment is not limited to have two magnetic elements 150.In other words, voice coil motor 101 also can only have a magnetic element, with one L shaped be example, and two coils 130 are respectively with respect to two adjacent sides of L shaped magnetic element, order about the effect that mount pad 140 and L shaped magnetic element move according to the magnetizing direction of L shaped magnetic element and can reach equally.
Second embodiment
Among present embodiment, all indicate with identical symbol with the first embodiment components identical.
See also Fig. 4, the voice coil motor 102 of present embodiment also includes a magnetic conduction heel piece 160.
Magnetic conduction heel piece 160 is arranged between mount pad 140 and the magnetic element 150, and it can be used to promote the utilance of the magnetic flux that magnetic element 150 provided, and then can promote first directed force F that is produced because of the electromagnetic voice coil effect between coil 130 and the magnetic element 150
1And second directed force F
2
Other component constructions, feature or function mode as for present embodiment can be identical with first embodiment, so for for the purpose of the description that makes this case is can be more clear understandable, omit the explanation of its repetition at this.
The 3rd embodiment
Among present embodiment, all indicate with identical symbol with the first embodiment components identical.
See also Fig. 5, the voice coil motor 103 of present embodiment also includes a position sensor 170.
Other component constructions, feature or function mode as for present embodiment can be identical with first embodiment, so for for the purpose of the description that makes this case is can be more clear understandable, omit the explanation of its repetition at this.
When mount pad 140 and magnetic element 150 move according to the magnetizing direction of magnetic element 150, (leakage) magnetic field intensity of the magnetic element 150 of a certain fixed point of position sensor (Hall element or reluctance sensing element) 170 in can induction voice coil motors 103.At this, (leakage) magnetic field intensity of the magnetic element 150 of a certain fixed point and the displacement of magnetic element 150 have certain relation to exist.By position sensor 170 is combined with a register control (not shown), can carry out the loop circuit positioning control, and then be controlled the shift position of mount pad 140 and magnetic element 150.
In sum, the disclosed voice coil motor of the present invention has following advantage:
(1),, thereby can make (first directed force F with joint efforts always that is produced because of the electromagnetic voice coil principle so the magnetic line of force in different directions or path all can be utilized simultaneously because the structural arrangement mode of coil and magnetic element
1And second directed force F
2) be raised.
(2),, thereby can promote the utilance of magnetic flux so the magnetic line of force in different directions or path all can be utilized simultaneously because the structural arrangement mode of coil and magnetic element.Therefore, voice coil motor can produce enough voice coil loudspeaker voice coil power under the situation that does not add any magnetic conduction heel piece, and then can omit shared volume of magnetic conduction heel piece and cost.
(3) since the hollow space of coil do not need to be passed by any element, so the size of the hollow space of coil can be reduced, thus, except the number of turns that can increase coil with the lifting voice coil loudspeaker voice coil power, still also can increase the bulk strength of coil.
(4) because the hollow space of coil does not need to be passed by any element,, thereby can reduce the overall dimensions of voice coil motor so the size of the hollow space of coil can be reduced.
(5) because voice coil motor only has an air gap between magnetic element (moving-member) and coil (fixed part), so can help the miniaturization of voice coil motor.
(6) because size and the position that the space of position sensor needn't be subject to coil is set,, thereby help reducing the overall dimensions of voice coil motor so the arrangements of components design has elasticity.
Though disclosed the present invention in conjunction with above preferred embodiment; yet it is not in order to limiting the present invention, anyly is familiar with this operator, without departing from the spirit and scope of the present invention; can do a little change and retouching, thus protection scope of the present invention should with enclose claim was defined is as the criterion.
Claims (6)
1. voice coil motor comprises:
Holder;
At least one guide bar is connected in this holder;
At least one coil, be connected in this holder, and have coil first winding body and the coil second winding body, wherein, this coil first winding body connection reaches with respect to this coil second winding body, and the sense of current in this coil first winding body and the current opposite in direction in this coil second winding body;
Mount pad is located on this guide bar in the mode that moves; And
At least one magnetic element, be connected in this mount pad, and have first magnetic pole and second magnetic pole, wherein, the magnetizing direction of this magnetic element is parallel to this mount pad and this motion of magnetic elements direction, and central shaft perpendicular to this coil, this first magnetic pole and this second magnetic pole are respectively with respect to this coil first winding body and this coil second winding body of this coil, this first magnetic pole and this coil first winding body reciprocation and produce first active force, this second magnetic pole and this coil second winding body reciprocation and produce second active force, and this first active force and this second active force order about this mount pad and this magnetic element and move according to the magnetizing direction of this magnetic element.
2. voice coil motor as claimed in claim 1, wherein, this guide bar is by magnetic conductive material is not made.
3. sound figure motor as claimed in claim 1, wherein, this guide bar and this holder are one-body molded.
4. voice coil motor as claimed in claim 1 also comprises magnetic conduction heel piece, is arranged between this mount pad and this magnetic element.
5. voice coil motor as claimed in claim 1 also comprises position sensor, is connected in this holder, and with respect to this magnetic element, in order to this motion of magnetic elements of sensing.
6. voice coil motor as claimed in claim 5, wherein, this position sensor can be Hall element, reluctance sensing element, inductance survey element or Photosensing Units.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100016998A CN101483376B (en) | 2008-01-10 | 2008-01-10 | Voice coil motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100016998A CN101483376B (en) | 2008-01-10 | 2008-01-10 | Voice coil motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101483376A CN101483376A (en) | 2009-07-15 |
| CN101483376B true CN101483376B (en) | 2011-05-18 |
Family
ID=40880353
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008100016998A Expired - Fee Related CN101483376B (en) | 2008-01-10 | 2008-01-10 | Voice coil motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101483376B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI493839B (en) * | 2013-08-14 | 2015-07-21 | Nat Univ Chung Cheng | Springless voice coil actuator and pre-compression magnet force calibration method thereof |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102466845A (en) * | 2010-11-17 | 2012-05-23 | 鸿富锦精密工业（深圳）有限公司 | Voice coil motor |
| US9035502B2 (en) * | 2011-02-07 | 2015-05-19 | Lg Innotek Co., Ltd. | Multifunctional voice coil motor |
| US9341810B2 (en) | 2012-05-09 | 2016-05-17 | Lg Innotek Co., Ltd. | Voice coil motor |
| EP4009090A1 (en) * | 2012-05-17 | 2022-06-08 | LG Innotek Co., Ltd. | Camera module and method for auto focusing the same |
| CN106575025B (en) * | 2014-07-03 | 2020-01-31 | Lg伊诺特有限公司 | Lens driving device |
| JP6449183B2 (en) * | 2016-02-17 | 2019-01-09 | 新シコー科技株式会社 | LENS DRIVE DEVICE, CAMERA DEVICE, AND ELECTRONIC DEVICE |
| CN107357026A (en) * | 2016-05-10 | 2017-11-17 | 台湾东电化股份有限公司 | Lens system |
| KR102527790B1 (en) * | 2018-01-30 | 2023-04-28 | 엘지이노텍 주식회사 | Camera module |
| CN115940570A (en) * | 2023-02-13 | 2023-04-07 | 基合半导体（宁波）有限公司 | Focusing motor, closed-loop control method of focusing motor and camera equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6307285B1 (en) * | 1997-09-17 | 2001-10-23 | Coactive Drive Corporation | Actuator with repulsive magnetic forces |
| CN1858975A (en) * | 2005-05-08 | 2006-11-08 | 吉佳科技股份有限公司 | Voice coil motor device |
-
2008
- 2008-01-10 CN CN2008100016998A patent/CN101483376B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6307285B1 (en) * | 1997-09-17 | 2001-10-23 | Coactive Drive Corporation | Actuator with repulsive magnetic forces |
| CN1858975A (en) * | 2005-05-08 | 2006-11-08 | 吉佳科技股份有限公司 | Voice coil motor device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI493839B (en) * | 2013-08-14 | 2015-07-21 | Nat Univ Chung Cheng | Springless voice coil actuator and pre-compression magnet force calibration method thereof |
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|---|---|
| CN101483376A (en) | 2009-07-15 |
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