CN109412354B - Voice coil motor capable of sensing motion trail - Google Patents
Voice coil motor capable of sensing motion trail Download PDFInfo
- Publication number
- CN109412354B CN109412354B CN201811424957.3A CN201811424957A CN109412354B CN 109412354 B CN109412354 B CN 109412354B CN 201811424957 A CN201811424957 A CN 201811424957A CN 109412354 B CN109412354 B CN 109412354B
- Authority
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- China
- Prior art keywords
- lens bracket
- shell
- voice coil
- coil motor
- sensing
- 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.)
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- 230000002093 peripheral effect Effects 0.000 claims abstract description 6
- 238000009413 insulation Methods 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 claims 2
- 239000010408 film Substances 0.000 description 36
- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 239000004020 conductor Substances 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
- H02K11/21—Devices for sensing speed or position, or actuated thereby
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
- G02B7/09—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification adapted for automatic focusing or varying magnification
-
- 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
- G03B13/00—Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
- G03B13/32—Means for focusing
- G03B13/34—Power focusing
- G03B13/36—Autofocus systems
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/30—Structural association with control circuits or drive circuits
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K33/00—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Optics & Photonics (AREA)
- Lens Barrels (AREA)
Abstract
The invention discloses a voice coil motor capable of sensing a motion track, which is electrically connected with a control circuit board, and comprises a shell, a lens bracket matched in the shell, a driving coil matched on the peripheral wall of the lens bracket and at least one driving magnet fixed on the side wall of the shell, wherein the lens bracket can move up and down; the voice coil motor capable of sensing the motion trail also comprises a strain film electrically connected with the control circuit board, wherein the strain film is arranged between the top of the lens bracket and the inner top wall of the shell and generates corresponding deformation along with the movement of the lens bracket. The invention senses the motion trail of the lens bracket through the strain film, and has simple structure and low cost.
Description
Technical Field
The invention relates to the field of voice coil motors, in particular to a voice coil motor capable of sensing a motion track.
Background
The miniature automatic focusing camera is widely applied to products such as mobile phones, automobiles, unmanned planes, security monitoring, intelligent home furnishings and the like. The common miniature automatic focusing camera is characterized in that a voice coil motor drives a lens to move along the optical axis of the camera, the voice coil motor is electrically connected with a control circuit board, and the voice coil motor is controlled by the control circuit board; the general voice coil motor mainly comprises a shell, a lens bracket matched in the shell and capable of moving up and down, a driving coil matched on the peripheral wall of the lens bracket and at least one driving magnet fixed on the side wall of the shell, wherein the shell is formed by splicing an upper cover and a base up and down, the driving coil is electrically connected with a control circuit board, a lens is fixed on the lens bracket, a light passing hole opposite to the lens is formed in the shell, and when the voice coil motor is used, driving current input to the driving coil is controlled through the control circuit board so as to drive the lens bracket to move under the interaction of the driving magnet and the driving coil, thereby realizing the function of automatic focusing.
At present, the voice coil motor is provided with a Hall element fixed on a shell and electrically connected with a control circuit board, a feedback magnet is fixed on a lens bracket, the feedback magnet moves along with the lens bracket to enable the Hall element to generate different feedback currents, the feedback currents can reflect the movement track of the lens bracket, the control circuit board controls the driving current of a driving coil according to the feedback currents, and accordingly feedback adjustment of the movement track of the lens bracket is achieved, and therefore the lens bracket is controlled to move accurately. However, the structure for sensing the movement track of the lens bracket through the Hall element and the feedback magnet has the problems of higher cost and more complicated structure.
Disclosure of Invention
The invention aims at a voice coil motor capable of sensing a motion track, which has the advantages of low cost and simple structure.
In order to achieve the above object, the solution of the present invention is:
the voice coil motor capable of sensing the motion trail is electrically connected with a control circuit board and comprises a shell, a lens bracket matched in the shell and capable of moving up and down, a control circuit board matched on the shell, a driving coil matched on the peripheral wall of the lens bracket and at least one driving magnet fixed on the side wall of the shell, wherein the driving coil is electrically connected with the control circuit board; the voice coil motor capable of sensing the motion trail further comprises a strain film, and the strain film is electrically connected with the control circuit board; the strain film is arranged between the top of the lens bracket and the inner top wall of the shell and generates corresponding deformation along with the movement of the lens bracket.
An upper insulating spring piece is arranged between the top of the lens bracket and the inner top wall of the shell, the upper insulating spring piece is of an annular structure, the outer edge of the upper insulating spring piece is connected with the shell, and the inner edge of the upper insulating spring piece is connected with the top of the lens bracket; the strain film is coated on the upper surface of the insulating upper spring plate.
The shell comprises an upper cover and a base connected with an opening at the bottom of the upper cover; the outer edge of the insulating upper elastic sheet is fixed on an annular frame which is positioned in the upper cover and connected with the base.
A lower spring piece is arranged between the bottom of the lens bracket and the base.
The elastic sheet on the insulation is made of rubber.
A conductive upper spring sheet is arranged between the top of the lens bracket and the inner top wall of the upper shell; the upper conductive spring plate is of an annular structure, the outer edge of the upper conductive spring plate is connected with the shell, the inner edge of the upper conductive spring plate is connected with the top of the lens bracket, and an insulating film is coated on the upper surface of the upper conductive spring plate; the strain film is coated on the insulation film.
The shell comprises an upper cover and a base connected with an opening at the bottom of the upper cover; the upper conductive spring piece is arranged between the top of the lens bracket and the upper cover, and the outer edge of the upper conductive spring piece is fixed on the upper cover.
A lower spring piece is arranged between the bottom of the lens bracket and the base.
The conductive upper spring plate is made of metal.
After the scheme is adopted, the strain film of the invention correspondingly deforms along with the movement of the lens bracket, and the resistance value of the strain film correspondingly changes along with the deformation of the strain film, so that the output voltage of the strain film correspondingly changes, and the movement track of the lens bracket can be sensed through the strain film.
Compared with the existing structure for sensing the movement track of the lens bracket through the Hall element and the feedback magnet, the invention senses the movement track of the lens bracket through the strain film, and has simpler structure and lower cost.
Drawings
FIG. 1 is an exploded view of a first embodiment of the present invention;
FIG. 2 is a combined cross-sectional view of a first embodiment of the invention;
FIG. 3 is an enlarged view at A of FIG. 2;
FIG. 4 is an exploded view of a second embodiment of the present invention;
FIG. 5 is a combined cross-sectional view of a second embodiment of the present invention;
FIG. 6 is an enlarged view at B of FIG. 5;
description of the reference numerals:
the shell 1, the upper cover 11, the base 12,
the lens holder 2 is provided with a lens,
the coil 3 is driven so that,
the magnet 4 is driven so that,
the thin film of strain 5,
the upper insulating dome 6, the annular frame 61,
the conductive upper spring sheet 6',
a lower spring plate 7 is arranged on the lower surface of the lower spring plate,
the insulating film 8 is provided with a film,
and a control circuit board S.
Detailed Description
As shown in fig. 1 to 6, the present invention discloses a voice coil motor capable of sensing motion track, which is electrically connected with a control circuit board S, and comprises a housing 1, a lens holder 2 movably fitted in the housing 1 up and down, a driving coil 3 fitted on a peripheral wall of the lens holder 2, and at least one driving magnet 4 fixed on a side wall of the housing 1, wherein the driving coil 3 is electrically connected with the control circuit board S; the control circuit board S controls the interaction between the driving magnet 4 and the driving coil 3 by controlling the driving current input to the driving coil 3 to drive the lens holder 2 to move.
As shown in fig. 2, 3, 5 and 6, the key point of the present invention is that: the invention also comprises a strain film 5 for sensing the motion trail of the lens bracket 2, wherein the strain film 5 is electrically connected with the control circuit board S; the strain film 5 is arranged between the top of the lens bracket 2 and the inner top wall of the shell 1 and correspondingly deforms along with the movement of the lens bracket, and when the strain film 5 deforms, the resistance value of the strain film 5 correspondingly changes, so that the output voltage of the strain film 5 correspondingly changes, the output voltage of the strain film 5 can reflect the movement track of the lens bracket 2, and the movement track of the lens bracket 2 can be sensed through the strain film 5. Compared with the prior structure for sensing the movement track of the lens bracket through the Hall element and the feedback magnet, the invention senses the movement track of the lens bracket 2 through the strain film 5, and has simpler structure and lower cost.
In order to further explain the technical scheme of the invention, the invention is explained in detail by specific examples.
Example 1
In this embodiment, an insulating elastic sheet 6 is disposed between the top of the lens holder 2 and the inner top wall of the housing 1, the insulating elastic sheet 6 may be made of rubber, the insulating elastic sheet 6 has a ring structure, the outer edge of the insulating elastic sheet 6 is connected with the housing 1, and the inner edge of the insulating elastic sheet 6 is connected with the top of the lens holder 2; the strain film 5 is coated on the upper surface of the insulation upper spring plate 6; therefore, the up-and-down movement of the lens support 2 can drive the upper insulating spring 6 to deform, the deformation of the upper insulating spring 6 can enable the strain film 5 coated on the upper insulating spring 6 to deform correspondingly, and the strain film 5 can deform correspondingly along with the up-and-down movement of the lens support 2.
In this embodiment, a lower spring 7 may be disposed between the bottom of the lens holder 2 and the inner bottom of the housing 1, so that a restoring force can be applied to the lens holder 2 through the upper spring 6 and the lower spring 7, so that the lens holder 2 can be quickly restored to the initial position when the driving coil 3 is not energized. The material of the lower spring 7 may be a conductive material, preferably a metal.
In this embodiment, the housing 1 may include an upper cover 11 and a base 12 connected to an opening at the bottom of the upper cover 11 by means of clamping, welding or bonding; the outer edge of the insulating upper spring plate 6 is fixed on an annular frame 61, and the annular frame 61 is positioned in the upper cover 11 and is connected with the base 12 in a clamping or welding or bonding way; the lower spring 7 is disposed between the bottom of the lens holder 2 and the base 12. The control circuit board S is fixed to the inner wall of the upper cover 11.
Example two
As shown in fig. 4 to 6, in this embodiment, a conductive upper spring plate 6' is disposed between the top of the lens holder 2 and the inner top wall of the upper housing 1; the conductive upper spring plate 6' can be made of metal, the conductive upper spring plate 6' is in an annular structure, the outer edge of the conductive upper spring plate 6' is connected with the shell 1, the inner edge of the conductive upper spring plate 6' is connected with the top of the lens bracket 2, and the upper surface of the conductive upper spring plate 6' is coated with an insulating film 8; the strain film 5 is coated on the insulating film 8; therefore, the up-and-down movement of the lens support 2 can drive the conductive upper spring plate 6' to deform, and the deformation of the conductive upper spring plate 6' can enable the strain film 5 matched with the conductive upper spring plate 6' to deform correspondingly, so that the strain film 5 can deform correspondingly along with the up-and-down movement of the lens support 2. And the insulating film 8 between the upper conductive spring piece 6' and the strain film 5 can isolate the upper conductive spring piece 6' from the strain film 5, so that the upper conductive spring piece 6' is prevented from affecting the output voltage of the strain film 5.
In this embodiment, a lower spring 7 may be disposed between the bottom of the lens holder 2 and the inner bottom of the housing 1, so that a restoring force can be applied to the lens holder 2 through the upper conductive spring 6' and the lower spring 7, so that the lens holder 2 can be quickly restored to the initial position when the driving coil 3 is not energized. The material of the lower spring 7 may be a conductive material, preferably a metal.
In this embodiment, the housing 1 may include an upper cover 11 and a base 12 connected to an opening at the bottom of the upper cover 11 by means of clamping, welding or bonding; the upper conductive spring piece 6 'is disposed between the top of the lens holder 2 and the upper cover 11, the outer edge of the upper conductive spring piece 6' is fixed on the upper cover, and the lower spring piece 7 is disposed between the bottom of the lens holder 2 and the base 12.
The above examples and drawings are not intended to limit the form or form of the present invention, and any suitable variations or modifications thereof by those skilled in the art should be construed as not departing from the scope of the present invention.
Claims (8)
1. The voice coil motor capable of sensing the motion track is electrically connected with a control circuit board and comprises a shell, a lens bracket matched in the shell and capable of moving up and down, a driving coil matched on the peripheral wall of the lens bracket and at least one driving magnet fixed on the side wall of the shell, wherein the driving coil is electrically connected with the control circuit board; the method is characterized in that: the voice coil motor capable of sensing the motion trail further comprises a strain film, and the strain film is electrically connected with the control circuit board; the strain film is arranged between the top of the lens bracket and the inner top wall of the shell and generates corresponding deformation along with the movement of the lens bracket; an upper insulating spring piece is arranged between the top of the lens bracket and the inner top wall of the shell, the upper insulating spring piece is of an annular structure, the outer edge of the upper insulating spring piece is connected with the shell, and the inner edge of the upper insulating spring piece is connected with the top of the lens bracket; the strain film is coated on the upper surface of the insulating upper spring plate.
2. A voice coil motor capable of sensing motion trajectories as recited in claim 1, wherein: the shell comprises an upper cover and a base connected with an opening at the bottom of the upper cover; the outer edge of the insulating upper elastic sheet is fixed on an annular frame which is positioned in the upper cover and connected with the base.
3. A voice coil motor capable of sensing motion trajectories as recited in claim 2, wherein: a lower spring piece is arranged between the bottom of the lens bracket and the base.
4. A voice coil motor capable of sensing a motion trajectory as claimed in claim 2 or 3, wherein: the elastic sheet on the insulation is made of rubber.
5. The voice coil motor capable of sensing the motion track is electrically connected with a control circuit board and comprises a shell, a lens bracket matched in the shell and capable of moving up and down, a driving coil matched on the peripheral wall of the lens bracket and at least one driving magnet fixed on the side wall of the shell, wherein the driving coil is electrically connected with the control circuit board; the method is characterized in that: the voice coil motor capable of sensing the motion trail further comprises a strain film, and the strain film is electrically connected with the control circuit board; the strain film is arranged between the top of the lens bracket and the inner top wall of the shell and generates corresponding deformation along with the movement of the lens bracket; a conductive upper spring sheet is arranged between the top of the lens bracket and the inner top wall of the upper shell; the upper conductive spring plate is of an annular structure, the outer edge of the upper conductive spring plate is connected with the shell, the inner edge of the upper conductive spring plate is connected with the top of the lens bracket, and an insulating film is coated on the upper surface of the upper conductive spring plate; the strain film is coated on the insulation film.
6. A voice coil motor for sensing motion trajectories as recited in claim 5, wherein: the shell comprises an upper cover and a base connected with an opening at the bottom of the upper cover; the upper conductive spring piece is arranged between the top of the lens bracket and the upper cover, and the outer edge of the upper conductive spring piece is fixed on the upper cover.
7. The voice coil motor of claim 6, wherein the voice coil motor is configured to sense a motion profile of the motor, and wherein: a lower spring piece is arranged between the bottom of the lens bracket and the base.
8. A voice coil motor capable of sensing motion trajectories as set forth in claim 6 or 7, wherein: the conductive upper spring plate is made of metal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811424957.3A CN109412354B (en) | 2018-11-27 | 2018-11-27 | Voice coil motor capable of sensing motion trail |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811424957.3A CN109412354B (en) | 2018-11-27 | 2018-11-27 | Voice coil motor capable of sensing motion trail |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109412354A CN109412354A (en) | 2019-03-01 |
| CN109412354B true CN109412354B (en) | 2024-01-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811424957.3A Active CN109412354B (en) | 2018-11-27 | 2018-11-27 | Voice coil motor capable of sensing motion trail |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20100008757U (en) * | 2009-02-24 | 2010-09-02 | 이-핀 옵티칼 인더스트리 컴퍼니 리미티드 | Voice coil driving auto-focus lens module |
| JP2011069862A (en) * | 2009-09-24 | 2011-04-07 | Shicoh Engineering Co Ltd | Lens driving device, autofocus camera and cellular phone with camera |
| CN103532300A (en) * | 2012-07-03 | 2014-01-22 | 株式会社捷太格特 | Control device and motor unit including the control device |
| WO2016005568A1 (en) * | 2014-07-11 | 2016-01-14 | Asml Netherlands B.V. | Actuator, positioning device, lithographic apparatus, and method for manufacturing an actuator |
| CN107167070A (en) * | 2017-06-26 | 2017-09-15 | 厦门大学 | A kind of resistance strain sensor and its manufacture method |
| CN107707083A (en) * | 2017-09-30 | 2018-02-16 | 厦门新鸿洲精密科技有限公司 | A kind of structure for sensing voice coil motor movement locus |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002343639A (en) * | 2001-05-21 | 2002-11-29 | Sony Corp | Thin-film coil, magnet head, method of manufacturing the coil, and method of manufacturing the head |
| CN104765123A (en) * | 2014-01-08 | 2015-07-08 | 博立码杰通讯(深圳)有限公司 | Zoom lens and driver thereof |
-
2018
- 2018-11-27 CN CN201811424957.3A patent/CN109412354B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20100008757U (en) * | 2009-02-24 | 2010-09-02 | 이-핀 옵티칼 인더스트리 컴퍼니 리미티드 | Voice coil driving auto-focus lens module |
| JP2011069862A (en) * | 2009-09-24 | 2011-04-07 | Shicoh Engineering Co Ltd | Lens driving device, autofocus camera and cellular phone with camera |
| CN103532300A (en) * | 2012-07-03 | 2014-01-22 | 株式会社捷太格特 | Control device and motor unit including the control device |
| WO2016005568A1 (en) * | 2014-07-11 | 2016-01-14 | Asml Netherlands B.V. | Actuator, positioning device, lithographic apparatus, and method for manufacturing an actuator |
| CN107167070A (en) * | 2017-06-26 | 2017-09-15 | 厦门大学 | A kind of resistance strain sensor and its manufacture method |
| CN107707083A (en) * | 2017-09-30 | 2018-02-16 | 厦门新鸿洲精密科技有限公司 | A kind of structure for sensing voice coil motor movement locus |
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| CN109412354A (en) | 2019-03-01 |
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