CN111474670B - Driving device of camera module - Google Patents
Driving device of camera module Download PDFInfo
- Publication number
- CN111474670B CN111474670B CN201910067026.0A CN201910067026A CN111474670B CN 111474670 B CN111474670 B CN 111474670B CN 201910067026 A CN201910067026 A CN 201910067026A CN 111474670 B CN111474670 B CN 111474670B
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- electromagnet
- piezoelectric ceramic
- ceramic stack
- lens
- camera module
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- 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
-
- 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
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lens Barrels (AREA)
Abstract
The invention relates to a driving device of a camera module, comprising: a lens mount for fixing a lens; the piezoelectric ceramic stack is fixed on the lens seat; an electromagnet arranged in contact with the lens mount; wherein the piezoelectric ceramic stack expands and contracts along the axial direction; and driving the lens to perform telescopic motion by controlling the sequence of power-on and power-off of the electromagnet and the piezoelectric ceramic stack.
Description
Technical Field
The invention relates to the technical field of camera modules, in particular to a driving device of a camera module.
Background
With the rapid development of the intelligent electronic product industry, the requirements of people on the imaging effect of the Camera are gradually improved, and compared with the traditional Camera system, the Camera Module (Camera Module) is widely applied to various new-generation handheld Camera devices due to the advantages of miniaturization, low power consumption, low cost, high image quality and the like. Present handheld device, in order to seek pleasing to the eye and by the design increasingly thin, therefore the height of camera module also reduces thereupon, corresponds lens group overall height and reduces, and because the needs of image quality, the sensitization face diagonal dimension of sensitization chip is bigger and bigger, how to guarantee that the angle of vision of lens group is unchangeable, increases sensitization chip size to satisfy the thinner outward appearance design of handheld device fuselage and always be the problem of handheld device design trade research.
Digital cameras, especially ultra-thin digital cameras, use a set of retractable lenses to solve this problem, and use mechanical structures such as screw/nut transmission and gear transmission, but such structures are bulky and cannot be placed in thinner devices such as mobile phones, notebook computers, and pads. And the voice coil motor that generally uses among the current thin and light type equipment, its lens cone can't stretch out outside the camera module, only can be used as autofocus, and the flexible function of camera lens can not be realized to the during operation, therefore can't solve above-mentioned camera module height and lower and problem that brings. In addition, in the mainstream camera module in the current market, to keep the lens at a certain position, the current needs to be continuously supplied to the coil to balance the elastic force of the elastic body, the power consumption of the module is relatively high, and when the lens barrel moves linearly along the optical axis direction, because the optical axis direction lacks a guide structure, the lens barrel is easy to shake, so that the optical path is eccentric, and the image quality is affected. Therefore, a new micro camera module is needed for a thin and light electronic device to solve the above-mentioned contradiction between the thickness and image quality of the existing module.
In view of the technical problems in the background art, it would be advantageous to provide a novel camera module suitable for slim and lightweight consumer electronics.
Disclosure of Invention
The invention aims to provide a driving device of a camera module, which is suitable for light and thin handheld electronic equipment to drive a lens, realize the telescopic function of the lens and improve the image quality.
In order to solve the above technical problem, the present invention provides a driving device of a camera module, including:
a lens mount for fixing a lens;
the piezoelectric ceramic stack is fixed on the lens seat;
an electromagnet arranged in contact with the lens mount;
wherein the piezoelectric ceramic stack expands and contracts along the axial direction; and driving the lens to perform telescopic motion by controlling the sequence of power-on and power-off of the electromagnet and the piezoelectric ceramic stack.
Optionally, after the electromagnet is powered on, the electromagnet adsorbs the lens mount; after the piezoelectric ceramic stack is electrified, the piezoelectric ceramic stack extends outwards along the axial direction; after the electromagnet and the piezoelectric ceramic stack are sequentially powered off, the piezoelectric ceramic stack restores to the original length and drives the lens mount to move outwards along the axial direction; and repeating the steps of electrifying the electromagnet, electrifying the piezoelectric ceramic stack, powering off the electromagnet and powering off the piezoelectric ceramic stack until the lens finishes focusing.
Optionally, after the piezoelectric ceramic stack is powered on, the piezoelectric ceramic stack extends and drives the lens mount to move axially inward; after the electromagnet is electrified, the electromagnet adsorbs the lens mount; after the piezoelectric ceramic stack is powered off, the piezoelectric ceramic stack recovers the original length; the electromagnet is powered off; and repeating the steps of electrifying the piezoelectric ceramic stack, electrifying the electromagnet, powering off the piezoelectric ceramic stack and powering off the electromagnet until the lens retracts.
Optionally, the method further includes: the first friction piece is fixedly connected with the shell; one side of the shell is provided with an opening for placing the electromagnet.
Optionally, the first friction member is a sheet structure fixed on two opposite sides of the inner side of the housing.
Optionally, the method further includes: and the second friction piece is fixed on the piezoelectric ceramic stack and corresponds to the first friction piece.
Optionally, the piezoelectric ceramic stack is of a hollow cylindrical structure, one end of the piezoelectric ceramic stack is fixedly connected to the lens mount, and the other end of the piezoelectric ceramic stack is fixedly connected to the second friction piece and is insulated from the lens mount and the second friction piece respectively.
Optionally, the second friction piece has a round hole in the middle and folded edges on both sides for contacting with the first friction piece.
Optionally, the lens mount is made of soft iron, a convex circular truncated cone is arranged in the middle, folded edges are arranged on two opposite sides, and the folded edge on one side is arranged in opposite contact with the electromagnet; the round table is used for fixing the lens.
Compared with the prior art, the driving device of the camera module has the following beneficial effects:
the driving device comprises an electromagnet and a piezoelectric ceramic stack, wherein the piezoelectric ceramic stack stretches along the axial direction, and the lens is driven to stretch and contract by controlling the sequence of power-on and power-off of the electromagnet and the piezoelectric ceramic stack. The camera module can enable the lens barrel to extend out of the module, ensures that the size of the photosensitive chip is increased and the image quality is improved under the condition that the field angle is not changed, simultaneously requires stable optical path of the lens, can meet the shooting work at different angles, and is convenient to be applied to light and thin electronic equipment such as mobile phones, pads and the like.
Drawings
Fig. 1 is a schematic structural diagram of a camera module according to an embodiment of the present invention;
fig. 2 is a schematic cross-sectional view of a camera module according to an embodiment of the present invention;
fig. 3 is a schematic cross-sectional view of a camera module according to an embodiment of the invention.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather construed as limited to the embodiments set forth herein.
Next, the present invention is described in detail by using schematic diagrams, and when the embodiments of the present invention are described in detail, the schematic diagrams are only examples for convenience of description, and the scope of the present invention should not be limited herein.
In order to make the above objects, features and advantages of the present invention more comprehensible, a driving apparatus of a camera module according to the present invention is described in detail below with reference to the accompanying drawings.
Referring to fig. 1, 2 and 3, the driving device of the camera module according to the present invention includes:
the friction piece comprises a shell 11 and a first friction piece 12 fixedly connected with the shell 11, wherein the first friction piece 12 is a sheet structure fixed on two opposite sides of the inner side of the shell 11.
A lens 22, a lens holder 21 for fixing the lens 22, and a piezo-ceramic stack 23 fixed to the lens holder 21. The lens mount 21 is made of soft iron, a raised circular truncated cone 211 is arranged in the middle, folding edges 212 are arranged on two opposite sides, the folding edge on one side is arranged in opposite contact with the electromagnet 13, and the circular truncated cone 211 is used for fixing the lens 22. The piezoelectric ceramic stack 23 is of a hollow cylindrical structure, the piezoelectric ceramic stack 23 and a middle circular truncated cone of the lens mount 21 are coaxial, one end of the piezoelectric ceramic stack is fixedly connected to the lens mount 21, and the other end of the piezoelectric ceramic stack is fixedly connected to the second friction piece 24 and is insulated from the lens mount 21 and the second friction piece 24 respectively.
The electromagnet 13 is disposed in contact with the lens holder 21, and one side of the housing 11 has an opening 111 for placing the electromagnet 13. When the electromagnet 13 is energized, the electromagnet interacts with the lens holder 21, and the static friction force on the whole lens holder 21 is f2, and when the electromagnet 13 is de-energized, the static friction force on the whole lens holder 21 is f 3.
The second friction member 24 fixed on the piezo-ceramic stack 23 is arranged corresponding to the first friction member 12. The second friction piece 24 has a circular hole in the middle, the circular hole in the middle is coaxial with the piezoelectric ceramic stack 23, and two sides of the circular hole are provided with folded edges 241 contacting with the first friction piece 12. The first friction element 12 is in close contact with the second friction element 24, and the static friction force between the two elements is f 1. The static friction force f2, f3 and f1 has a value of f3< f1< f 2.
Further, the driving device of the camera module further comprises: lens cover glass 25, cover glass cover 26 and first friction piece 12, second friction piece 24 fixed connection, lens cover glass 25 is fixed embedding on cover glass cover 26.
The housing 11, the first friction member 12 and the electromagnet 11 form a stator, and the lens holder 21, the lens 22, the piezoelectric ceramic stack 23 and the second friction member 24 form a mover. The piezoelectric ceramic stack 23 extends and retracts along the axial direction to drive the rotor to move in a retracting manner. The lens 22 is driven to perform telescopic motion by controlling the sequence of power-on and power-off of the electromagnet 13 and the piezoelectric ceramic stack 23.
Specifically, the process of completing the lens extension of the camera module is as follows: after the electromagnet 13 is powered on, the electromagnet 13 adsorbs the lens holder 21, at this time, the static friction force applied to the whole lens holder 21 is f2, and the static friction force between the first friction piece 12 and the second friction piece 24 is f 1; after the piezoelectric ceramic stack 23 is electrified, the piezoelectric ceramic stack 23 lengthways extends, and as f2 is greater than f1, the lens mount 21 keeps still, and the piezoelectric ceramic stack 23 drives the second friction piece 24 to move outwards along the axial direction; the electromagnet 13 is powered off, at this time, the static friction force on the whole lens mount 21 is f3, the static friction force between the first friction piece 12 and the second friction piece 24 is f1, after the piezoelectric ceramic stack 23 is powered off, the piezoelectric ceramic stack 23 recovers to the original length, and since f1 is greater than f3, the second friction piece 24 remains still, and the piezoelectric ceramic stack 23 drives the lens mount 21 to move axially outwards; the electromagnet 13 is powered off; the piezoelectric ceramic stack 23 is powered off; and repeating the steps of electrifying the electromagnet 13, electrifying the piezoelectric ceramic stack 23, powering off the electromagnet 13 and powering off the piezoelectric ceramic stack 23 until the lens 22 finishes focusing.
The shell 11, the first friction piece 12 and the electromagnet 13 form a stator, the lens seat 21, the lens 22, the piezoelectric ceramic stack 23 and the second friction piece 24 form a rotor, the electromagnet is electrified and deenergized to enable the stator and the rotor to be adsorbed or loosened, the piezoelectric ceramic stack is adopted to move along the axial direction so as to drive the lens to perform telescopic motion, large stroke and high precision can be realized, the precision can reach 0.01 mu m, and the power consumption is lower.
The process of completing the lens retraction of the camera module is as follows: after the piezoelectric ceramic stack 23 is powered on, the piezoelectric ceramic stack 23 longitudinally extends, at this time, the static friction force applied to the whole lens mount 21 is f3, the static friction force between the first friction member 12 and the second friction member 24 is f1, and since f1 is greater than f3, the second friction member 24 remains stationary, and the piezoelectric ceramic stack 23 drives the lens mount 21 to move axially inward; after the electromagnet 13 is powered on, the electromagnet 13 adsorbs the lens holder 21, at this time, the static friction force applied to the whole lens holder 21 is f2, and the static friction force between the first friction piece 12 and the second friction piece 24 is f 1; after the stack of the piezoelectric ceramic stack 23 is powered off, the piezoelectric ceramic stack 23 will recover to the original length, and since f2 is greater than f1, the lens mount 21 remains stationary, and the piezoelectric ceramic stack 23 drives the second friction piece 24 to move axially inwards; the electromagnet 13 is powered off; and repeating the steps of electrifying the piezoelectric ceramic stack 23, electrifying the electromagnet 13, powering off the piezoelectric ceramic stack 23 and powering off the electromagnet 13 until the lens retracts.
In conclusion, the driving device drives the lens to perform telescopic motion by controlling the power-on and power-off sequence of the electromagnet and the piezoelectric ceramic stack, is particularly beneficial to the stability of the optical path characteristic of the lens, and can realize the beneficial effect of keeping the position immovable after power-off. When the camera lens seat moves, the camera lens seat is always attached to one side of the shell to move up and down, the rotor moves to generate axial bidirectional movement and high control precision, the size of the photosensitive chip is increased under the condition that the field angle is not changed, and the image quality is improved. Furthermore, the driving device of the invention has simple structure and can be applied to handheld light and thin electronic equipment.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make possible variations and modifications of the present invention using the method and the technical contents disclosed above without departing from the spirit and scope of the present invention, and therefore, any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention are all within the scope of the present invention.
Claims (7)
1. The utility model provides a drive arrangement of camera module which characterized in that includes:
a lens mount for fixing a lens;
the piezoelectric ceramic stack is fixed on the lens seat;
an electromagnet arranged in contact with the lens mount;
wherein the piezoelectric ceramic stack expands and contracts along the axial direction; driving the lens to perform telescopic motion by controlling the sequence of power-on and power-off of the electromagnet and the piezoelectric ceramic stack;
the first friction piece is fixedly connected with the shell; one side of the shell is provided with an opening for placing an electromagnet;
the second friction piece is fixed on the piezoelectric ceramic stack and corresponds to the first friction piece;
the first friction piece is in close contact with the second friction piece, and the static friction force between the first friction piece and the second friction piece is f 1; when the electromagnet is powered on, the electromagnet interacts with the lens holder, the static friction force borne by the whole lens holder is f2, and when the electromagnet is powered off, the static friction force borne by the whole lens holder is f 3;
the static friction force f2, f3 and f1 has a value of f3< f1< f 2.
2. The driving device of the camera module according to claim 1, wherein after the electromagnet is powered on, the electromagnet adsorbs the lens mount; after the piezoelectric ceramic stack is electrified, the piezoelectric ceramic stack extends outwards along the axial direction; after the electromagnet and the piezoelectric ceramic stack are sequentially powered off, the piezoelectric ceramic stack restores to the original length and drives the lens mount to move outwards along the axial direction; and repeating the steps of electrifying the electromagnet, electrifying the piezoelectric ceramic stack, powering off the electromagnet and powering off the piezoelectric ceramic stack until the lens finishes focusing.
3. The driving device of the camera module according to claim 1, wherein after the piezoelectric ceramic stack is powered on, the piezoelectric ceramic stack extends and drives the lens holder to move axially inward; after the electromagnet is electrified, the electromagnet adsorbs the lens mount; after the piezoelectric ceramic stack is powered off, the piezoelectric ceramic stack recovers the original length; the electromagnet is powered off; and repeating the steps of electrifying the piezoelectric ceramic stack, electrifying the electromagnet, powering off the piezoelectric ceramic stack and powering off the electromagnet until the lens retracts.
4. The camera module driving device according to claim 1, wherein the first friction member is a plate-like structure fixed on two opposite sides of the inner side of the housing.
5. The camera module driving device according to claim 1, wherein the piezo-ceramic stack is a hollow cylinder, one end of the piezo-ceramic stack is fixedly connected to the lens holder, and the other end of the piezo-ceramic stack is fixedly connected to the second friction member and is insulated from the lens holder and the second friction member, respectively.
6. The driving device of the camera module according to claim 1, wherein the second friction member has a circular hole in the middle and two folded edges on two sides for contacting with the first friction member.
7. The driving device of the camera module according to claim 1, wherein the lens holder is made of soft iron, a convex circular table is arranged in the middle of the lens holder, two folded edges are arranged on two opposite sides of the lens holder, and one folded edge is arranged in a manner of being opposite to and in contact with the electromagnet; the round table is used for fixing the lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910067026.0A CN111474670B (en) | 2019-01-24 | 2019-01-24 | Driving device of camera module |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910067026.0A CN111474670B (en) | 2019-01-24 | 2019-01-24 | Driving device of camera module |
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| CN111474670A CN111474670A (en) | 2020-07-31 |
| CN111474670B true CN111474670B (en) | 2022-06-21 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117255969A (en) * | 2021-05-07 | 2023-12-19 | 宁波舜宇光电信息有限公司 | Image pickup module, optical actuator, photosensitive assembly and manufacturing method thereof |
| CN115379072B (en) * | 2021-05-17 | 2024-07-09 | 宁波舜宇光电信息有限公司 | Optical actuator and corresponding camera module |
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| KR100693752B1 (en) * | 2005-10-13 | 2007-03-12 | 엘지전자 주식회사 | Piezo actuated linear motor, driving method thereof and camera module using the same |
| TW201310109A (en) * | 2011-08-18 | 2013-03-01 | Tdk Taiwan Corp | Piezoelectric driving module for lens |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE112007001349T5 (en) * | 2006-09-26 | 2009-04-09 | Nec Tokin Corp., Sendai | lens module |
| TWI347725B (en) * | 2007-04-09 | 2011-08-21 | Voice coil motor apparatus for positioning | |
| CN201188142Y (en) * | 2007-12-07 | 2009-01-28 | 德昌电机(深圳)有限公司 | Optical system driven by piezo-electric motor for focusing |
| CN201477278U (en) * | 2009-08-03 | 2010-05-19 | 一品国际科技股份有限公司 | Piezoelectric autofocus lens module |
| WO2015001954A1 (en) * | 2013-07-04 | 2015-01-08 | コニカミノルタ株式会社 | Lens driving apparatus |
| KR20150136786A (en) * | 2014-05-28 | 2015-12-08 | 삼성전기주식회사 | Actuator and Camera Module including the Same |
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| KR100693752B1 (en) * | 2005-10-13 | 2007-03-12 | 엘지전자 주식회사 | Piezo actuated linear motor, driving method thereof and camera module using the same |
| TW201310109A (en) * | 2011-08-18 | 2013-03-01 | Tdk Taiwan Corp | Piezoelectric driving module for lens |
| CN106301065A (en) * | 2016-07-28 | 2017-01-04 | 中国计量科学研究院 | There is the single shaft nanometer displacement executor of millimeter stroke |
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