Precision detection device and method for anti-shake structure of camera module

Abstract

The invention discloses a precision detection device and method for an anti-shake structure of a camera module, and belongs to the technical field of camera modules. The device is used for testing the motion precision of a motion module in an anti-shake structure, the device comprises a test platform, a fixing clamp arranged on the test platform, a driving assembly, a distance measuring assembly and a precision detection module, and the driving assembly is used for driving the motion module to translate along a first direction or a second direction or rotate around a third direction; the distance measuring assembly comprises two laser range finders and is used for detecting the moving distance when the moving module translates in the first direction or the second direction or the rotating angle when the moving module rotates around the third direction; the precision detection module is used for determining whether the motion precision of the motion module meets the requirement according to the motion parameters detected by the distance measurement assembly. According to the device, the movement distance and the rotation angle of the movement module are measured through the two laser range finders, and the cost is lower. And the requirement for experience of operators is low, and operation and maintenance are easy.

Description

Technical Field

[0001] The present invention relates to the technical field of camera modules, and in particular to a precision detection device and method for an anti-shake structure of a camera module. Background Art

[0002] Sensor-Shift technology is an optical image stabilization technology that uses the drive mechanism in the camera module to drive the image sensor to perform an anti-shake movement relative to the lens. The motion module in the camera module, that is, the component used to install the image sensor, also moves in all directions. In order to ensure the anti-shake effect, the motion accuracy of the motion module needs to be tested during the production of the camera module.

[0003] In related technologies, the three-dimensional laser measurement method is often used to test the motion accuracy of the motion module, that is, the moving distance and rotation angle of the motion module are measured using a three-dimensional measuring instrument. The test principle is mainly as follows: the object to be measured is placed in the three-dimensional measurement space, and the laser transmitter in the three-dimensional measuring instrument emits a laser beam to the surface of the object. The laser beam bounces back and is received by the receiver. The receiver calculates the propagation time and reflection angle of the laser beam to obtain the coordinate position of each measuring point on the object to be measured. According to the three-dimensional spatial coordinate values ​​of these points, the geometric size, shape and position of the object to be measured are calculated.

[0004] However, the above three-dimensional measuring instruments are expensive, have high testing costs, are difficult to maintain, and are easily affected by the environment. They are also complicated to use, and the operator's skills and experience have a great impact on the accuracy of the measurement results. If the operator is not fully trained or lacks skills, it may also lead to inaccurate measurement results or large errors. Summary of the invention

[0005] In view of the above problems, the present invention is proposed to provide a precision detection device and method for the anti-shake structure of a camera module that overcomes the above problems or at least partially solves the above problems. The moving distance and rotation angle of the motion module can be measured by two laser rangefinders, which has lower cost, low experience requirements for operators, is easy to operate and maintain, and has good reliability.

[0006] In a first aspect, a precision detection device for an anti-shake structure of a camera module is provided, which is used to test the motion precision of a motion module in the anti-shake structure, wherein the motion module is a module in the camera module that moves synchronously with an image sensor, and the device comprises:

[0007] Test platform;

[0008] A fixing fixture, arranged on the test platform and used for fixing the motion module;

[0009] A driving component, arranged on the test platform, for driving the motion module to translate along a first direction or a second direction, or to rotate about a third direction, wherein the first direction and the second direction are parallel to the plane where the test platform is located and perpendicular to each other, and the third direction is perpendicular to the plane where the test platform is located;

[0010] A distance measuring component, comprising two laser distance meters, arranged on the test platform, and used to detect the motion parameters of the motion module, wherein the motion parameters include: the moving distance of the motion module when it translates along the first direction or the second direction, or the rotation angle of the motion module around the third direction;

[0011] The precision detection module is used to obtain the motion parameters detected by the distance measurement component, and determine whether the motion precision of the motion module meets the requirements according to the detected motion parameters.

[0012] Optionally, the ranging component includes:

[0013] A first laser rangefinder is disposed on the test platform and spaced apart from the motion module in the first direction, and is used to detect a first distance between the motion module and the first laser rangefinder in the first direction;

[0014] A second laser rangefinder is disposed on the test platform and spaced apart from the motion module in the second direction, and is used to detect a second distance between the motion module and the second laser rangefinder in the second direction;

[0015] The laser angles of the first laser rangefinder and the second laser rangefinder are orthogonal at 90°.

[0016] Optionally, the ranging component further includes:

[0017] A moving distance determination module is used to obtain the first distance detected by the first laser rangefinder before and after the motion module is translated along the first direction, and determine the first moving distance of the motion module when it is translated along the first direction according to a first change in the first distance; or to obtain the second distance detected by the second laser rangefinder before and after the motion module is translated along the second direction, and determine the second moving distance of the motion module when it is translated along the second direction according to a second change in the second distance.

[0018] Optionally, the ranging component further includes:

[0019] A first reflective calibration object, disposed on the motion module, and used to reflect the first laser beam emitted by the first laser rangefinder;

[0020] The second reflective calibration object is arranged on the motion module and is used to reflect the second laser beam emitted by the second laser rangefinder.

[0021] Optionally, the ranging component further includes:

[0022] A rotation angle determination module is used to obtain the first distance detected by the first laser rangefinder and the second distance detected by the second laser rangefinder before and after the motion module rotates around the third direction; and determine the rotation angle of the motion module around the third direction based on the detected first distance and second distance.

[0023] Optionally, the rotation angle determination module is further used for:

[0024] The rotation angle of the motion module around the third direction is calculated according to the following formula:

[0025]

[0026] Wherein, θ is the rotation angle of the motion module around the third direction, L x0 is the first initial distance between the first laser rangefinder and the initial position installation point of the motion module in the first direction; L x1 is the first distance detected by the first laser rangefinder before the motion module rotates around the third direction by an angle θ; x2 L is the first distance detected by the first laser rangefinder after the motion module rotates around the third direction by an angle θ; y0 is the second initial distance between the second laser rangefinder and the initial position installation point of the motion module in the second direction; L y1 is the second distance detected by the second laser rangefinder before the motion module rotates around the third direction by an angle θ; y2 It is the second distance detected by the second laser rangefinder after the motion module rotates by an angle θ around the third direction.

[0027] Optionally, the accuracy detection module is further used to:

[0028] When the first moving distance is within the error range of the first standard distance, determining that the motion accuracy of the motion module meets the requirement;

[0029] Among them, the first moving distance is the moving distance detected by the distance measuring component when the motion module is translated along the first direction; the first standard distance is the moving distance set by the tester that the motion module needs to reach when it is translated along the first direction.

[0030] Optionally, the accuracy detection module is further used to:

[0031] When the second moving distance is within the error range of the second standard distance, it is determined that the motion accuracy of the motion module meets the requirement;

[0032] Among them, the second moving distance is the moving distance detected by the ranging component when the motion module is translated along the second direction; the second standard distance is the moving distance set by the tester that the motion module needs to reach when it is translated along the second direction.

[0033] Optionally, the accuracy detection module is further used to:

[0034] When the rotation angle of the motion module around the third direction is within the error range of the standard rotation angle, it is determined that the motion accuracy of the motion module meets the requirement;

[0035] The standard rotation angle is a rotation angle set by a tester that the motion module needs to reach when rotating around the third direction.

[0036] In a second aspect, a method for testing the accuracy of an anti-shake structure of a camera module is provided, wherein the accuracy detection device as described in the first aspect is used to test the motion accuracy of a motion module in the anti-shake structure, wherein the motion module is a module in the camera module that moves synchronously with an image sensor, and the method comprises:

[0037] The motion module is fixedly mounted on a fixing fixture of the test platform;

[0038] A driving assembly is used to drive the motion module to translate along a first direction or a second direction, or to rotate around a third direction, wherein the first direction and the second direction are parallel to the plane where the test platform is located and perpendicular to each other, and the third direction is perpendicular to the plane where the test platform is located;

[0039] After the driving component drives the motion module to move to a certain position, a distance measuring component is used to detect motion parameters of the motion module, wherein the motion parameters include: a moving distance of the motion module when it translates along the first direction or the second direction, or a rotation angle of the motion module around the third direction;

[0040] The motion parameters detected by the ranging component are acquired, and it is determined whether the motion accuracy of the motion module meets the requirements according to the detected motion parameters.

[0041] The technical solution provided in the embodiments of the present invention has at least the following technical effects or advantages:

[0042] The precision detection device and method of the anti-shake structure of the camera module provided by the embodiment of the present invention provide a new precision detection device for testing the motion precision of the motion module in the anti-shake structure. The fixing fixture in the device can fix the motion module on the test platform, and the driving component can drive the motion module to translate along the first direction or the second direction parallel to the test platform, or rotate around the third direction perpendicular to the test platform. After the driving component drives the motion module to move in place, the ranging component can be used to detect the motion parameters of the motion module, that is, the moving distance of the motion module when it translates along the first direction or the second direction, or the rotation angle of the motion around the third direction. Finally, the precision detection module can determine whether the motion precision of the motion module meets the requirements according to the motion parameters of the motion module detected by the ranging component. Compared with the prior art using a three-dimensional measuring instrument, the device can measure the moving distance and rotation angle of the motion module through two laser rangefinders, which is lower in cost and has low requirements on the experience of the operator. The entire device is easy to operate and maintain, and has good reliability.

[0043] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0045] Figure 1 It is a structural schematic diagram of a precision detection device for an anti-shake structure of a camera module provided by an embodiment of the present invention;

[0046] Figure 2 This is a schematic diagram of a laser ranging principle provided by an embodiment of the present invention;

[0047] Figure 3 It is a flow chart of a method for testing the accuracy of a camera module anti-shake structure provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0048] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings.

[0049] Various structural schematic diagrams according to embodiments of the present disclosure are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may further design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0050] In the context of the present disclosure, when a layer / element is referred to as being "on" another layer / element, the layer / element may be directly on the other layer / element, or there may be an intervening layer / element therebetween. Additionally, if a layer / element is "on" another layer / element in one orientation, the layer / element may be "below" the other layer / element when the orientation is reversed. In the context of the present disclosure, similar or identical components may be denoted by the same or similar reference numerals.

[0051] In order to better understand the above-mentioned technical scheme, the above-mentioned technical scheme will be described in detail below in combination with specific implementation methods. It should be understood that the embodiments of the present disclosure and the specific features in the embodiments are detailed descriptions of the technical scheme of the present application, rather than limitations on the technical scheme of the present application. In the absence of conflict, the embodiments of the present application and the technical features in the embodiments can be combined with each other.

[0052] Figure 1 is a structural schematic diagram of a precision detection device for an anti-shake structure of a camera module provided by an embodiment of the present invention, such as Figure 1 As shown, the device includes a test platform 10 , a fixing fixture 20 , a driving component 30 , a distance measuring component 40 and an accuracy detection module 50 .

[0053] The fixing fixture 20 is arranged on the test platform 10 and is used to fix the motion module M. The driving component 30 is arranged on the test platform 10 and is used to drive the motion module M to translate along the first direction X or the second direction Y, or to rotate around the third direction Z. The first direction X and the second direction Y are parallel to the plane where the test platform 10 is located and perpendicular to each other, and the third direction Z is perpendicular to the plane where the test platform 10 is located. The distance measuring component 40 includes two laser rangefinders, which are arranged on the test platform 10 and are used to detect the motion parameters of the motion module M. The motion parameters include: the moving distance when the motion module M translates along the first direction X or the second direction Y, or the rotation angle of the motion module M around the third direction Z. The accuracy detection module 50 is connected to the distance measuring component 40 for communication, and is used to obtain the motion parameters detected by the distance measuring component 40, and determine whether the motion accuracy of the motion module M meets the requirements according to the detected motion parameters.

[0054] The above device can measure the moving distance and rotation angle of the motion module by using two laser rangefinders, has lower cost, low operator experience requirements, is easy to operate and maintain, and has good reliability.

[0055] In this embodiment, the motion module M is a module in the camera module for installing an image sensor and moving synchronously with the image sensor. The motion module M may include structures such as a frame, a moving platform, a driving assembly, and a suspension mechanism. Among them, the frame is used as a supporting structure of the entire motion module, usually in a frame structure, and surrounds the installation area. The frame not only provides stable support, but also cooperates with other components to achieve precise movement of the image sensor. The moving platform is located in the installation area and is used to install the camera body, that is, the image sensor and its related components, and the moving platform can move along the X-axis direction and / or the Y-axis direction, and can also rotate around the Z-axis direction. The image sensor is installed on the moving platform, so the movement of the moving platform will drive the image sensor to move synchronously. The design of the moving platform usually takes into account stability and accuracy to ensure smooth movement of the image sensor. The driving assembly is a key component that drives the moving platform to move, and is used to drive the moving platform to move. The suspension mechanism is used to suspend the moving platform in the installation area and provide elastic forces to reset the moving platform to the initial state along the X-axis direction, the Y-axis direction, and the Z-axis direction. When the driving assembly stops working, the suspension mechanism ensures that the moving platform returns to the initial position smoothly. In addition, the motion module may also include other auxiliary components, such as flexible circuit boards, for the transmission and connection of electrical signals. These components work together to achieve the precise movement and anti-shake function of the image sensor.

[0056] Optionally, the distance measuring component 40 includes a first laser distance measuring device 41 and a second laser distance measuring device 42 .

[0057] The first laser rangefinder 41 is disposed on the test platform 10 and is spaced apart from the motion module M in the first direction X, and is used to detect a first distance L between the motion module M and the first laser rangefinder 41 in the first direction X. x The second laser rangefinder 42 is disposed on the test platform 10 and is spaced apart from the motion module M in the second direction Y, and is used to detect a second distance L between the motion module M and the second laser rangefinder 42 in the second direction Y. y The laser angles of the first laser rangefinder 41 and the second laser rangefinder 42 are orthogonal at 90°.

[0058] By setting up two laser rangefinders, the moving distance of the motion module M can be detected from the X direction and the Y direction respectively.

[0059] Optionally, the distance measuring component 40 further includes:

[0060] The moving distance determination module 43 is used to obtain the first distance L detected by the first laser rangefinder 41 before and after the motion module M is translated along the first direction X. x , according to the first distance L x The first change amount is used to determine the first moving distance when the motion module is translated along the first direction X; or, to obtain the second distance L detected by the second laser rangefinder 42 before and after the motion module M is translated along the second direction Y Y , according to the second distance L Y The second change amount determines the second moving distance of the motion module M when it translates along the second direction Y.

[0061] In this embodiment, the motion module M moves forward and backward along the first direction X, and the first distance L x The first change ΔL x That is, the first moving distance when the motion module M moves along the first direction X. Before and after the motion module M moves along the second direction Y, the first distance L Y The second change ΔL Y That is, the second moving distance when the motion module M moves along the second direction Y.

[0062] Optionally, the distance measuring component 40 further includes a first reflective calibration object and a second reflective calibration object (not shown in the figure).

[0063] The first reflective calibration object is arranged on the motion module M, and is used to reflect the first laser beam emitted by the first laser rangefinder 41 ; the second reflective calibration object is arranged on the motion module M, and is used to reflect the second laser beam emitted by the second laser rangefinder 42 .

[0064] In another implementation of this embodiment, a larger reflective calibration object may be provided on the motion module to meet the requirements of reflecting the first laser beam and the second laser beam, which is not limited in this embodiment. In a specific implementation, the first reflective calibration object and the second reflective calibration object may be installed on the moving platform of the motion module.

[0065] Optionally, the distance measuring component 40 further includes:

[0066] The rotation angle determination module 44 is used to obtain the first distance L detected by the first laser rangefinder 41 before and after the motion module M rotates around the third direction Z. X and the second distance L detected by the second laser rangefinder 42 Y ; According to the detected first distance L X and the second distance L Y , determine the rotation angle θ of the motion module M around the third direction Z.

[0067] Optionally, the rotation angle determination module 44 is further used for:

[0068] The rotation angle of the motion module around the third direction is calculated according to the following formula (5):

[0069]

[0070] Where θ is the rotation angle of the motion module around the third direction, L x0 L is the first initial distance between the first laser rangefinder and the initial position installation point of the motion module in the first direction; x1 L is the first distance detected by the first laser rangefinder before the motion module rotates around the third direction by an angle θ; x2 L is the first distance detected by the first laser rangefinder after the motion module rotates around the third direction by an angle θ; y0 L is the second initial distance between the second laser rangefinder and the initial position installation point of the motion module in the second direction; y1 L is the second distance detected by the second laser rangefinder before the motion module rotates around the third direction by an angle θ; y2 It is the second distance detected by the second laser rangefinder after the motion module rotates around the third direction by an angle θ.

[0071] Figure 2 Schematic diagram of a laser ranging principle provided by an embodiment of the present invention. Figure 2 As shown in the figure, O is the installation origin, O' represents the initial position installation point of the motion module, Lb represents the first laser rangefinder, La represents the second laser rangefinder, B1 represents the position of the motion module M in the first direction X before the motion module M rotates around the third direction Z by an angle θ, B2 represents the position of the motion module M in the first direction X after the motion module M rotates around the third direction Z by an angle θ; A1 represents the position of the motion module M in the second direction Y before the motion module rotates around the third direction Z by an angle θ, and A2 represents the position of the motion module M in the second direction Y after the motion module M rotates around the third direction Z by an angle θ.

[0072] By calculating the vector The angle between the rotation angle θ of the motion module around the third direction can be obtained. The specific calculation formula is as follows:

[0073]

[0074] Expands to:

[0075] (OLb-LaA1, OLa-LbB1)*Mr= (OLb-LaA2, OLa-LbB2); (2)

[0076] Among them, Mr is the rotation matrix, and the rotation matrix is ​​fixed.

[0077]

[0078]

[0079] Among them, OLa and OLb are the known installation distances of the ranging laser, OLa=O'Lb=L x0 , OLb=O'La=L y0 , LbB1=L x1 , LbB2=L x2 , LaA1=L y1 , LaA2=L y2 , then the above formula (4) can be transformed into the following formula (5):

[0080]

[0081] Optionally, the accuracy detection module 50 is further used for:

[0082] When the first moving distance is within the error range of the first standard distance, it is determined that the motion accuracy of the motion module meets the requirement;

[0083] The first moving distance is the moving distance detected by the distance measuring component 40 when the motion module M moves in the first direction X; the first standard distance is the moving distance that the motion module M needs to reach when it moves in the first direction X set by the tester.

[0084] On the contrary, when the first moving distance is not within the error range of the first standard distance, it means that the motion accuracy of the motion module does not meet the requirement.

[0085] Optionally, the accuracy detection module 50 is further used for:

[0086] When the second moving distance is within the error range of the second standard distance, it is determined that the motion accuracy of the motion module meets the requirement;

[0087] Among them, the second moving distance is the moving distance detected by the distance measuring component 40 when the motion module M translates along the second direction Y; the second standard distance is the moving distance that the motion module M needs to reach when it translates along the second direction Y set by the tester.

[0088] Optionally, the accuracy detection module 50 is further used for:

[0089] When the rotation angle θ of the motion module M around the third direction Z is within the error range of the standard rotation angle, it is determined that the motion accuracy of the motion module M meets the requirements;

[0090] The standard rotation angle is the rotation angle that the motion module needs to achieve when rotating around the third direction set by the tester.

[0091] In this embodiment, the error range can be set manually according to the accuracy requirement. For example, the distance error can be set within ±0.5 mm. The angle error can be set within ±0.5°, etc. The present invention is not limited to this.

[0092] It should be noted that, in this embodiment, the moving distance determination module 43 and the rotation angle determination module 44 can be connected to the two laser rangefinders by wired or wireless communication, so as to obtain the distance parameters detected by the two laser rangefinders. The moving distance determination module 43 and the rotation angle determination module 44 can also be connected to the precision detection module 50 by wired or wireless communication, and the present invention does not limit this. The precision detection module 50 may include a data processing unit and a comparison and judgment unit. The data processing unit may be responsible for receiving the data transmitted by the distance measurement component 40, and processing and analyzing it. It may include computing elements such as a microprocessor and a single-chip microcomputer, as well as corresponding data processing algorithms and programs. Through the data processing unit, the actual moving distance or rotation angle of the motion module can be calculated. The comparison and judgment unit may include components such as a comparator and a logic judgment circuit, which are used to compare the actual measurement value with the preset value to determine whether the motion accuracy of the motion module meets the requirements.

[0093] The device provided in the above embodiment is only illustrated by the division of the above functional modules. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0094] Based on the same inventive concept, an embodiment of the present invention also provides a method for testing the accuracy of the anti-shake structure of a camera module, using an accuracy detection device as described in the above embodiment to test the motion accuracy of a motion module in the anti-shake structure, wherein the motion module is a module in the camera module that moves synchronously with the image sensor. Figure 3 : is a flow chart of a method for testing the accuracy of a camera module anti-shake structure provided by an embodiment of the present invention. Figure 3 As shown, the method includes:

[0095] Step S310, fixing the motion module on a fixing fixture of the test platform;

[0096] Step S320: Use a driving component to drive the motion module to translate along the first direction or the second direction, or to rotate around a third direction.

[0097] The first direction and the second direction are parallel to the plane where the test platform is located and perpendicular to each other, and the third direction is perpendicular to the plane where the test platform is located.

[0098] Step S330: After the driven component drives the motion module to move to the desired position, the distance measuring component is used to detect the motion parameters of the motion module. The motion parameters include: the moving distance of the motion module when it translates along the first direction or the second direction, or the rotation angle of the motion module around the third direction.

[0099] In this embodiment, the distance measuring component includes two laser rangefinders. The specific principle of the distance measuring component detecting motion parameters can be found in the relevant description in the above embodiments, which will not be repeated here.

[0100] Step S340: acquiring the motion parameters detected by the distance measurement component, and determining whether the motion accuracy of the motion module meets the requirements according to the detected motion parameters.

[0101] In this embodiment, step S340 can be implemented by the accuracy detection module in the above embodiment. The specific implementation principle of the accuracy detection module can refer to the relevant description in the above embodiment, which will not be repeated here.

[0102] The technical solution provided in the embodiments of the present invention has at least the following technical effects or advantages:

[0103] The precision detection device and method of the anti-shake structure of the camera module provided by the embodiment of the present invention provide a new precision detection device for testing the motion precision of the motion module in the anti-shake structure. The fixing fixture in the device can fix the motion module on the test platform, and the driving component can drive the motion module to translate along the first direction or the second direction parallel to the test platform, or rotate around the third direction perpendicular to the test platform. After the driving component drives the motion module to move in place, the ranging component can be used to detect the motion parameters of the motion module, that is, the moving distance of the motion module when it translates along the first direction or the second direction, or the rotation angle of the motion around the third direction. Finally, the precision detection module can determine whether the motion precision of the motion module meets the requirements according to the motion parameters of the motion module detected by the ranging component. Compared with the prior art using a three-dimensional measuring instrument, the device can measure the moving distance and rotation angle of the motion module through two laser rangefinders, which is lower in cost and has low requirements on the experience of the operator. The entire device is easy to operate and maintain, and has good reliability.

[0104] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0105] Similarly, it should be understood that in order to streamline the present disclosure and aid in understanding one or more of the various inventive aspects, in the above description of exemplary embodiments of the present invention, various features of the present invention are sometimes grouped together into a single embodiment, figure, or description thereof. However, this disclosed method should not be interpreted as reflecting the intention that the claimed invention requires more features than those explicitly recited in each claim. More specifically, as reflected in the claims below, inventive aspects lie in less than all the features of the individual embodiments disclosed above. Therefore, the claims that follow the specific embodiment are hereby expressly incorporated into the specific embodiment, with each claim itself serving as a separate embodiment of the present invention.

[0106] It should be noted that the above embodiments illustrate the present invention rather than limit it, and that those skilled in the art may devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference symbol between brackets shall not be construed as a limitation on the claims. The word "comprising" does not exclude the presence of components or steps not listed in the claims. The word "one" or "an" preceding a component does not exclude the presence of a plurality of such components. The present invention may be implemented by means of hardware comprising a number of different components and by means of a suitably programmed computer. In a unit claim enumerating a number of devices, several of these devices may be embodied by the same hardware item. The use of the words first, second, and third, etc., does not indicate any order. These words may be interpreted as names.

Claims

1. A precision detection device for an anti-shake structure of a camera module, characterized in that: Used to test the motion accuracy of a motion module in an anti-shake structure, where the motion module is a module in a camera module that moves synchronously with an image sensor, the device comprises: Test platform; A fixing fixture, arranged on the test platform and used for fixing the motion module; A driving component, arranged on the test platform, for driving the motion module to translate along a first direction or a second direction, or to rotate about a third direction, wherein the first direction and the second direction are parallel to the plane where the test platform is located and perpendicular to each other, and the third direction is perpendicular to the plane where the test platform is located; A distance measuring component, comprising two laser distance meters, arranged on the test platform, and used to detect the motion parameters of the motion module, wherein the motion parameters include: the moving distance of the motion module when it translates along the first direction or the second direction, or the rotation angle of the motion module around the third direction; The precision detection module is connected to the distance measurement component for obtaining the motion parameters detected by the distance measurement component and determining whether the motion precision of the motion module meets the requirements according to the detected motion parameters.

2. The device according to claim 1, characterized in that The ranging component comprises: A first laser rangefinder is disposed on the test platform and spaced apart from the motion module in the first direction, and is used to detect a first distance between the motion module and the first laser rangefinder in the first direction; A second laser rangefinder is disposed on the test platform and spaced apart from the motion module in the second direction, and is used to detect a second distance between the motion module and the second laser rangefinder in the second direction; The laser angles of the first laser rangefinder and the second laser rangefinder are orthogonal at 90°.

3. The device according to claim 2, characterized in that The ranging component also includes: A moving distance determination module is used to obtain the first distance detected by the first laser rangefinder before and after the motion module is translated along the first direction, and determine the first moving distance of the motion module when it is translated along the first direction according to a first change in the first distance; or to obtain the second distance detected by the second laser rangefinder before and after the motion module is translated along the second direction, and determine the second moving distance of the motion module when it is translated along the second direction according to a second change in the second distance.

4. The device according to claim 2, characterized in that The ranging component also includes: A first reflective calibration object, disposed on the motion module, and used to reflect the first laser beam emitted by the first laser rangefinder; The second reflective calibration object is arranged on the motion module and is used to reflect the second laser beam emitted by the second laser rangefinder.

5. The device according to claim 2, characterized in that The ranging component also includes: A rotation angle determination module is used to obtain the first distance detected by the first laser rangefinder and the second distance detected by the second laser rangefinder before and after the motion module rotates around the third direction; and determine the rotation angle of the motion module around the third direction based on the detected first distance and second distance.

6. The device according to claim 5, characterized in that The rotation angle determination module is also used for: The rotation angle of the motion module around the third direction is calculated according to the following formula: Wherein, θ is the rotation angle of the motion module around the third direction, L x0 is the first initial distance between the first laser rangefinder and the initial position installation point of the motion module in the first direction; L x1 is the first distance detected by the first laser rangefinder before the motion module rotates around the third direction by an angle θ; x2 L is the first distance detected by the first laser rangefinder after the motion module rotates around the third direction by an angle θ; y0 is the second initial distance between the second laser rangefinder and the initial position installation point of the motion module in the second direction; L y1 is the second distance detected by the second laser rangefinder before the motion module rotates around the third direction by an angle θ; y2 It is the second distance detected by the second laser rangefinder after the motion module rotates by an angle θ around the third direction.

7. The device according to claim 1, characterized in that The accuracy detection module is also used for: When the first moving distance is within the error range of the first standard distance, determining that the motion accuracy of the motion module meets the requirement; Among them, the first moving distance is the moving distance detected by the distance measuring component when the motion module is translated along the first direction; the first standard distance is the moving distance set by the tester that the motion module needs to reach when it is translated along the first direction.

8. The device according to claim 1, characterized in that The accuracy detection module is also used for: When the second moving distance is within the error range of the second standard distance, it is determined that the motion accuracy of the motion module meets the requirement; Among them, the second moving distance is the moving distance detected by the ranging component when the motion module is translated along the second direction; the second standard distance is the moving distance set by the tester that the motion module needs to reach when it is translated along the second direction.

9. The device according to claim 1, characterized in that The accuracy detection module is also used for: When the rotation angle of the motion module around the third direction is within the error range of the standard rotation angle, it is determined that the motion accuracy of the motion module meets the requirement; The standard rotation angle is a rotation angle set by a tester that the motion module needs to reach when rotating around the third direction.

10. A method for testing the accuracy of an anti-shake structure of a camera module, characterized in that: The accuracy detection device according to any one of claims 1 to 9 is used to test the motion accuracy of a motion module in an anti-shake structure, wherein the motion module is a module in a camera module that moves synchronously with an image sensor, and the method comprises: The motion module is fixedly mounted on a fixing fixture of the test platform; A driving assembly is used to drive the motion module to translate along a first direction or a second direction, or to rotate around a third direction, wherein the first direction and the second direction are parallel to the plane where the test platform is located and perpendicular to each other, and the third direction is perpendicular to the plane where the test platform is located; After the driving component drives the motion module to move to a certain position, a distance measuring component is used to detect motion parameters of the motion module, wherein the motion parameters include: a moving distance of the motion module when it translates along the first direction or the second direction, or a rotation angle of the motion module around the third direction; The motion parameters detected by the ranging component are acquired, and it is determined whether the motion accuracy of the motion module meets the requirements according to the detected motion parameters.

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