CN212231606U - Optical axis governing system of camera module - Google Patents
Optical axis governing system of camera module Download PDFInfo
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- CN212231606U CN212231606U CN202020848833.4U CN202020848833U CN212231606U CN 212231606 U CN212231606 U CN 212231606U CN 202020848833 U CN202020848833 U CN 202020848833U CN 212231606 U CN212231606 U CN 212231606U
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- optical axis
- camera module
- lens assembly
- actuator
- adjustment system
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Abstract
The utility model provides an optical axis governing system of camera module, through the position information who corresponds the part that corresponds of a plurality of position detection component feedback camera lens subassembly that corresponds the setting with a plurality of actuators, the actuator is according to the motion distance of the part that corresponds of the position information regulation camera lens subassembly of feedback, in order to guarantee the optical axis stability of camera lens subassembly, improve the imaging quality, can be used to the large stroke drive, reduce and make and the assembly requirement, the process of initiatively aiming at can be omitted in the assembling process, the process is simplified, the cost is reduced, thereby camera module wholeness ability has been improved greatly.
Description
Technical Field
The utility model relates to an optical axis governing system of camera module.
Background
Existing camera modules generally include a lens assembly and an actuator for driving the lens assembly to move in an optical axis direction, there being only one actuator in the optical axis direction, when the actuator has a large driving stroke, a small-angle offset is easily generated between the optical axis of the lens assembly and the optical axis of the image sensor (the optical axis offset is different from an error caused by shaking in the shooting process, the shaking error generally refers to the overall offset motion of the camera module caused by motion, spontaneous shaking of a human body and the like in the shooting process, and the optical axis offset refers to the offset degree of the optical axis of the lens assembly and the optical axis of the image sensor in the camera module in the focusing process), which affects the imaging quality, although this small angular offset can be optimized during manufacturing and assembly, the manufacturing and assembly process is complicated and costly, which is not conducive to manufacturing.
With the rapid development of portable electronic devices, the requirements of people on the imaging effect of a camera module are gradually improved, the shooting quality is improved mainly by increasing the optical sizes of a lens and an image sensor at present, and the increase of the optical size and the number of pixels of the image sensor puts higher requirements on the stability of an optical axis.
In addition, during the assembly process of the camera module, an optical Active Alignment (AA) device is usually required to adjust the posture and relative position relationship between the lens assembly and the image sensor, so as to ensure that the optical axis of the lens assembly is perpendicular to the plane of the image sensor. However, the active alignment process is complicated and costly.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an optical axis governing system of camera module guarantees the optical axis stability, improves the imaging quality, reduces and makes and the assembly requirement, improves camera module wholeness ability.
Based on the above consideration, the utility model provides an optical axis governing system of camera module, include: a lens assembly; a plurality of actuators for driving the lens assembly to move in the optical axis direction; and the position detection elements are used for feeding back the position information of the corresponding part of the lens assembly, so that the actuator can adjust the movement distance of the corresponding part of the lens assembly according to the fed back position information, and the stability of the optical axis of the lens assembly is ensured.
Preferably, the camera module includes at least three actuators, and at least one position detection element is provided for each actuator.
Preferably, the camera module comprises four actuators symmetrically arranged at four corners of the lens assembly.
Preferably, the actuator is a piezoelectric actuator, a voice coil actuator or a memory alloy actuator.
Preferably, the piezoelectric actuator includes a piezoelectric element and a driving rod, and an elastic buckle fixedly connected to the lens assembly is in frictional contact with the driving rod to drive the lens assembly to move along the optical axis direction.
Preferably, two driving rods located on the same side of the lens assembly abut against the supporting structure to ensure that the movement direction of the driving rods is parallel to the optical axis direction.
Preferably, the memory alloy actuator is integrally provided with the corresponding position detection element.
Preferably, the position detection element is a hall sensor or a capacitive grating sensor.
The utility model discloses an optical axis governing system of camera module, through the position information who corresponds the part that corresponds of a plurality of position detection component feedback camera lens subassembly that corresponds the setting with a plurality of actuators, the actuator is according to the motion distance of the part that corresponds of the position information regulation camera lens subassembly of feedback, in order to guarantee the optical axis stability of camera lens subassembly, improve the imaging quality, can be used to the long-range drive, reduce and make and the assembly requirement, the process of initiatively aiming at can be omitted to the assembling process, the process is simplified, the cost reduction, thereby camera module wholeness ability has been improved greatly.
Drawings
Other features, objects and advantages of the invention will become more apparent from the following detailed description of non-limiting embodiments thereof, which proceeds with reference to the accompanying drawings.
Fig. 1 is a schematic structural view of an optical axis adjusting system of the camera module of the present invention;
fig. 2 is a flowchart of the optical axis adjusting method of the camera module according to the present invention.
In the drawings, like or similar reference numbers indicate like or similar devices (modules) or steps throughout the different views.
Detailed Description
The utility model provides an optical axis governing system of camera module, through the position information who corresponds the part that corresponds of a plurality of position detection component feedback camera lens subassembly that corresponds the setting with a plurality of actuators, the actuator is according to the motion distance of the part that corresponds of the position information regulation camera lens subassembly of feedback, in order to guarantee the optical axis stability of camera lens subassembly, improve the imaging quality, can be used to the large stroke drive, reduce and make and the assembly requirement, the process of initiatively aiming at can be omitted in the assembling process, the process is simplified, the cost is reduced, thereby camera module wholeness ability has been improved greatly.
In the following detailed description of the preferred embodiments, reference is made to the accompanying drawings which form a part hereof. The accompanying drawings illustrate, by way of example, specific embodiments in which the invention may be practiced. The illustrated embodiments are not intended to be exhaustive of all embodiments according to the invention. It is to be understood that other embodiments may be utilized and structural or logical changes may be made without departing from the scope of the present invention. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present invention is defined by the appended claims.
The present invention will be described in detail with reference to the following embodiments.
As shown in fig. 1, the optical axis adjusting system of the camera module of the present invention includes a lens assembly 1 and a plurality of actuators 2, and here, four actuators 2 are shown, preferably, symmetrically disposed at four corners of the lens assembly, and these actuators 2 are used for driving the lens assembly 1 to move along the optical axis direction. The four position detection elements 3 are respectively arranged in one-to-one correspondence with the actuators 2 and used for feeding back the position information of the corresponding parts of the lens assembly 1, so that the actuators 2 can adjust the movement distance of the corresponding parts of the lens assembly 1 according to the fed-back position information, and the stability of the optical axis of the lens assembly 1 is ensured.
Those skilled in the art can understand that, based on the principle of determining one side by three points, the optical axis adjusting system of the camera module of the present invention at least includes three actuators 2, and each actuator 2 is correspondingly provided with at least one position detection element 3, so that the actuator 2 adjusts the movement distance of the corresponding part of the lens assembly 1 according to the position information fed back by the position detection element 3, thereby adjusting the plane where the lens assembly 1 is located, and further ensuring the optical axis stability of the lens assembly 1.
Wherein the actuator 2 may be a piezoelectric actuator, a voice coil actuator or a memory alloy actuator. The position detection element 3 may be a hall sensor or a capacitive sensor.
In the preferred embodiment shown in fig. 1, the actuator 2 is a piezoelectric actuator, the piezoelectric actuator 2 includes piezoelectric elements 21 and driving rods 22, preferably, the driving rods 22 are respectively disposed on the upper surfaces of the piezoelectric elements 21, each piezoelectric element 21 will carry the corresponding driving rod 22 to reciprocate up and down with high frequency when vibrating at high frequency, and two driving rods 22 located on the same side of the lens assembly 1 abut against the same supporting structure 5, so as to ensure that the moving direction of the driving rods 22 is always parallel to the optical axis direction. Each driving rod 22 is in friction contact with an elastic buckle 4 in the tangential direction, the other end of the elastic buckle 4 is fixedly connected with the lens component 1, the driving rods 22 and the elastic buckles 4 can provide driving force moving along the optical axis direction for corresponding parts of the lens component 1 under the action of friction force and inertia, and when the resultant force of the driving force provided by the four piezoelectric actuators 2 to the lens component 1 is parallel to the optical axis direction, the lens component 1 can move up and down stably. The position detection elements 3 are respectively arranged near each piezoelectric actuator 2, the position detection elements 3 respectively provide position information of the corresponding part of the lens assembly 1 for the corresponding piezoelectric actuators 2, when the position measured by the position detection elements 3 is deviated from a calibration value, namely a target position, the corresponding piezoelectric actuators 2 can timely adjust the movement distance of the corresponding part of the lens assembly 1, the compensation mechanism can ensure that in the movement process, a plane formed by four stress points of the lens assembly 1 is always perpendicular to the optical axis direction or keeps a tiny included angle, and thus the optical axis stability of the lens assembly 1 can be ensured.
Specifically, the flow of the optical axis adjusting method of the camera module of the present invention is as shown in fig. 2, four piezoelectric actuators 2 work, the lens assembly 1 moves, according to the command issued by the platform, the corresponding portion of the lens assembly 1 should be moved to the target positions TarPos1, TarPos2, TarPos3, TarPos4, the four position detecting elements 3 should read the current positions CurPos1, CurPos2, CurPos3, and CurPos4 of the corresponding portion of the lens assembly 1, respectively, compare whether the absolute value of the difference | CurPos-TarPos | between the current position CurPos and the target position TarPos | obtained by each position detecting element 3 is less than or equal to a set value TH, if yes, the current position of the corresponding portion of the lens assembly 1 at that position meets the requirement; if not, the movement distance of the corresponding part of the lens assembly 1 is adjusted through the piezoelectric actuator 2 at the position to adjust the current position information of the corresponding part of the lens assembly 1 until the current position of the corresponding part of the lens assembly 1 at each position meets the requirement, and at this time, the optical axis of the lens assembly 1 meets the requirement.
In other preferred embodiments, not shown, when the actuator 2 is a memory alloy actuator, it may be provided integrally with the corresponding position detecting element 3.
In addition, the position detection element 3 can feed back the position information of the corresponding part of the lens assembly 1 in real time, and the actuator 2 adjusts the movement distance of the corresponding part of the lens assembly 1 in real time according to the fed back position information, so that an active alignment process can be omitted in the assembly process of the camera module, and the optical axis of the lens assembly is calibrated and calibration data is recorded after the assembly is completed, for example, the calibration data is burned into a one-time programmable memory (OTP) to be used as an optical axis reference in the subsequent movement process, so that the assembly process is simplified, and the cost is reduced.
To sum up, the utility model discloses an optical axis governing system of camera module, through the position information that corresponds the part that corresponds of a plurality of position detection component feedback lens subassembly that corresponds the setting with a plurality of actuators, the actuator is according to the motion distance of the part that corresponds of the position information regulation lens subassembly of feedback, with the optical axis stability of guaranteeing the lens subassembly, improve the image quality, can be used to the large stroke drive, reduce and make and the assembly requirement, the process of initiatively aiming at can be omitted in the assembling process, the process is simplified, therefore, the cost is reduced, thereby the camera module wholeness can be greatly improved.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive. Furthermore, it will be obvious that the word "comprising" does not exclude other elements or steps, and the word "a" or "an" does not exclude a plurality. Several elements recited in the apparatus claims may also be implemented by one element. The terms first, second, etc. are used to denote names, but not any particular order.
Claims (8)
1. The utility model provides an optical axis governing system of camera module which characterized in that includes:
a lens assembly;
a plurality of actuators for driving the lens assembly to move in the optical axis direction;
and the position detection elements are used for feeding back the position information of the corresponding part of the lens assembly, so that the actuator can adjust the movement distance of the corresponding part of the lens assembly according to the fed back position information, and the stability of the optical axis of the lens assembly is ensured.
2. An optical axis adjustment system of a camera module according to claim 1, wherein said camera module comprises at least three actuators, each actuator being provided with at least one position detection element.
3. An optical axis adjustment system for a camera module as claimed in claim 2, wherein said camera module includes four actuators symmetrically disposed at the corners of the lens assembly.
4. An optical axis adjustment system for a camera module according to claim 1, wherein said actuator is a piezoelectric actuator, a voice coil actuator or a memory alloy actuator.
5. An optical axis adjustment system for a camera module as claimed in claim 4, wherein the piezoelectric actuator comprises a piezoelectric element and a driving rod, and an elastic latch fixedly connected to the lens module is in frictional contact with the driving rod to move the lens module in the optical axis direction.
6. An optical axis adjustment system for a camera module as claimed in claim 5, wherein the two driving rods located on the same side of the lens assembly abut against the supporting structure to ensure that the moving direction of the driving rods is parallel to the optical axis.
7. An optical axis adjustment system for a camera module according to claim 4, wherein the memory alloy actuator is integrally provided with the corresponding position detection element.
8. The optical axis adjustment system of a camera module according to claim 1, wherein the position detection element is a hall sensor or a capacitive grating sensor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020848833.4U CN212231606U (en) | 2020-05-20 | 2020-05-20 | Optical axis governing system of camera module |
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| CN202020848833.4U CN212231606U (en) | 2020-05-20 | 2020-05-20 | Optical axis governing system of camera module |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114915709A (en) * | 2021-02-10 | 2022-08-16 | 宁波舜宇光电信息有限公司 | Sleeve type optical actuator and corresponding camera module and terminal equipment |
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2020
- 2020-05-20 CN CN202020848833.4U patent/CN212231606U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114915709A (en) * | 2021-02-10 | 2022-08-16 | 宁波舜宇光电信息有限公司 | Sleeve type optical actuator and corresponding camera module and terminal equipment |
| CN114915709B (en) * | 2021-02-10 | 2023-09-19 | 宁波舜宇光电信息有限公司 | Sleeve type optical actuator, corresponding camera module and terminal equipment |
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