Camera module test target board and camera module test method

Abstract

Camera module test target board and camera module test method. The camera module test target board includes: a target board main body, wherein the target board main body has a preset pattern on a test surface; and at least one reflection element, wherein the reflection element extends from the test surface and is arranged along the edge of the preset pattern, and an inner side of the reflection element has a reflection surface that mirrors the preset pattern to form a mirror image pattern, and the mirror image pattern and the preset pattern form a test image to reduce the size of the test target board.

Description

Technical Field

[0001] The present invention relates to the field of camera modules, and more particularly to a test target board for a camera module and a test method for a camera module, wherein the horizontal dimension of the test target board for the camera module is small, without affecting the size of the test image, thereby reducing the volume of the test equipment. Background Art

[0002] In recent years, with the gradual penetration of smart phones into people's lives, it has greatly promoted the rapid development of industries related to mobile phones. Among them, the camera module industry has developed rapidly. With the improvement of mobile phone performance, consumers' requirements for various functions related to mobile phones are also getting higher and higher. Among them, the camera / photo-taking function is frequently used in daily life and the attention is increasing day by day. Consumers and manufacturers are both pursuing higher-performance camera modules, and the wide-angle module is one of them. Compared with other modules, the wide-angle module can capture a larger area of scenery and is more suitable for taking pictures of larger scenes, such as buildings, landscapes, etc. The wide-angle module is loved by the majority of consumers for its excellent performance. Correspondingly, the production capacity of the module factory has also been tested.

[0003] The volumes of the test equipment used by existing camera module manufacturers are generally large, occupying a large area, and the layout rate per unit area is generally low, resulting in less-than-ideal production capacity and economic benefits. Moreover, the field of view angle of the wide-angle module is larger than that of ordinary modules, and the required target board area is larger, resulting in a more bulky calibration device for the wide-angle module, and correspondingly lower production capacity and economic benefits.

[0004] One of the main factors affecting the volume of the test equipment is the area of the test target board. Since the wide-angle module has a large field of view angle, a large size is required when designing the test target board to ensure that the size of the test target board meets the test requirements. However, when the size of the test target board is too large, it will correspondingly cause the overall size of the equipment to become larger, thereby occupying space, being unfavorable for the workshop layout, and further increasing the cost. Summary of the Invention

[0005] An object of the present invention is to provide a test target board for a camera module and a test method for a camera module, wherein the test target board can provide a test image with a horizontal dimension larger than a preset pattern horizontal dimension of the main body of the test target board, so that under the same test image size requirement, the test target board of the present invention requires a smaller volume.

[0006] Another object of the present invention is to provide a test target board for a camera module and a test method for a camera module, wherein by providing a test image with a horizontal dimension larger than the horizontal dimension of the main body of the test target board, the test target board can be applied to a traditional test equipment to test a wide-angle camera module, such as a wide-angle module, without occupying more space.

[0007] Another object of the present invention is to provide a test target for a camera module and a test method for a camera module, wherein the test target mirrors a preset pattern of the test target body through a reflecting element, so as to enlarge the size of the test image.

[0008] Another object of the present invention is to provide a test target for a camera module and a test method for a camera module, wherein the reflecting element extends vertically from the surface of the test target body to minimize the distortion of the mirrored pattern.

[0009] Another object of the present invention is to provide a test target for a camera module and a test method for a camera module, wherein the reflecting elements are joined end to end to form a closed structure, thereby avoiding incomplete test images formed by mirroring.

[0010] Another object of the present invention is to provide a test target for a camera module and a test method for a camera module, wherein the shape formed by joining the reflecting elements end to end is not fixed and can be square, circular, polygonal, etc.

[0011] Another object of the present invention is to provide a test target for a camera module and a test method for a camera module, wherein the reflecting element is implemented as a glass plate, and the thickness of the glass plate is less than 6 mm to reduce the influence of phenomena such as double images on the formation of the test image.

[0012] Another object of the present invention is to provide a test target for a camera module and a test method for a camera module, wherein the reflecting surface of the reflecting element is provided with a magnetron sputtering coating to further reduce the influence of phenomena such as double images on the formation of the test image.

[0013] Another object of the present invention is to provide a test target for a camera module and a test method for a camera module, wherein the reflecting element is implemented as a reflective film, thereby avoiding phenomena such as double images caused by the thickness of the emitting element itself.

[0014] Another object of the present invention is to provide a test target for a camera module and a test method for a camera module, wherein the test method for the camera module limits the minimum height of the reflecting element according to the maximum field of view angle and the test distance of the camera module to be measured, so that the maximum field of view angle of the camera module to be measured intersects with the reflecting element, thereby ensuring that the camera module to be measured can be completely tested.

[0015] Another object of the present invention is to provide a test target for a camera module and a test method for a camera module, wherein the test image adopted by the test method for the camera module is a virtual-real combined image. Compared with the full-solid image adopted in the prior art, there is no need to worry about the size of the test target body.

[0016] Another object of the present invention is to provide a camera module test reticle and a camera module test method, wherein the angle between the reflecting element and the test reticle body can be adjusted to be applicable to detecting camera modules with different performances.

[0017] According to one aspect of the present invention, the present invention further provides a camera module test reticle, comprising:

[0018] a reticle body, wherein the reticle body has a preset pattern on a test surface; and

[0019] at least one reflecting element, wherein the reflecting element extends from the test surface and is arranged along the edge of the preset pattern, and an inner side of the reflecting element has a reflecting surface that mirrors the preset pattern to form a mirror image pattern, and the mirror image pattern and the preset pattern form a test image.

[0020] According to an embodiment of the present invention, the mirror image pattern and the preset pattern are seamlessly mirror-connected.

[0021] According to an embodiment of the present invention, adjacent reflecting elements are arranged at intervals along the edge of the preset pattern.

[0022] According to an embodiment of the present invention, two reflecting elements are symmetrically arranged on opposite edges of the preset pattern.

[0023] According to an embodiment of the present invention, adjacent reflecting elements are correspondingly arranged in edge-to-edge contact on adjacent edges of the preset pattern.

[0024] According to an embodiment of the present invention, the reflecting element closes in on and surrounds the preset pattern.

[0025] According to an embodiment of the present invention, the reflecting element is implemented as a smooth and flat plate with a mirror plane reflection function.

[0026] According to an embodiment of the present invention, the thickness of the reflecting element is less than 6 mm.

[0027] According to an embodiment of the present invention, the reflecting element has an auxiliary film, and the auxiliary film covers the surface of the reflecting surface to enhance the fitting degree between the mirror image pattern and the preset pattern.

[0028] According to an embodiment of the present invention, the auxiliary film is implemented as a magnetron sputtering coating.

[0029] According to an embodiment of the present invention, the reflecting element includes a reflecting film and an auxiliary plate, wherein the auxiliary plate extends from the test surface end to end and closes in on and surrounds the preset pattern, and the reflecting film is attached to the inner side of the auxiliary plate to form the reflecting surface.

[0030] According to an embodiment of the present invention, the reflection element and the reticle body are arranged perpendicular to each other.

[0031] According to an embodiment of the present invention, the reflection element is movably held on the reticle body.

[0032] According to an embodiment of the present invention, the camera module test reticle further includes a transition device, wherein the transition device is disposed at a connection of adjacent sides of the reflection element and is connected to the test surface to maintain a closed connection end to end.

[0033] According to an embodiment of the present invention, the camera module test reticle further includes a rotation device, wherein the rotation device rotatably holds the reflection element on the reticle body to rotate the reflection element relative to the reticle body.

[0034] According to an embodiment of the present invention, the camera module test reticle further includes a moving mechanism, wherein the moving mechanism movably holds the reflection element on the reticle body to move the reflection element in the X and / or Y-axis directions relative to the surface of the reticle body.

[0035] According to an embodiment of the present invention, the reflection element is held on the reticle body in a highly adjustable manner.

[0036] According to an embodiment of the present invention, the camera module test reticle further includes an accuracy assisting device, wherein the accuracy assisting device is installed on the test reticle body for testing the relative levelness between the reticle body and a camera module to be tested.

[0037] According to an embodiment of the present invention, the accuracy assisting device is implemented as a spirit level or a laser rangefinder.

[0038] According to an embodiment of the present invention, the camera module test reticle further includes an accuracy assisting device, wherein the accuracy assisting device is installed on the test reticle body for measuring the angle between the reflection element and the reticle body.

[0039] According to an embodiment of the present invention, for the maximum field of view angle α of the camera module to be tested, the test distance b of the camera module to be tested, the distance c from the reflection element to the center of the reticle body, and the height h of the reflection element, the relationship is: h is not less than b - c / tan(α / 2).

[0040] In another aspect of the present invention, the present invention further provides a method for testing a camera module, including:

[0041] (a) Fix a camera module under test and a test target board such that the test range of the camera module under test is smaller than the size of the test image provided by the test target board, where the test image is a virtual-real combined test image;

[0042] (b) The camera module under test captures the virtual-real combined test image to form a captured image; and

[0043] (c) Analyze the performance of the camera module under test based on the captured image and the virtual-real combined test image.

[0044] According to an embodiment of the present invention, the virtual-real combined test image in step (a) is formed by a mirror pattern and a preset pattern, where the mirror pattern is formed by disposing at least one reflecting element at the edge of the preset pattern and mirroring the preset pattern. Description of the Drawings

[0045] Figure 1 is a three-dimensional view of a camera module test target board according to a first embodiment of the present invention.

[0046] Figure 2 is a schematic diagram of a test image of the camera module test target board according to the first embodiment of the present invention.

[0047] Figure 3 is a three-dimensional view of a camera module test target board according to a second embodiment of the present invention.

[0048] Figure 4 is a schematic diagram of a test image of the camera module test target board according to the second embodiment of the present invention.

[0049] Figure 5 is a three-dimensional view of a camera module test target board according to a third embodiment of the present invention.

[0050] Figure 6 is a schematic diagram of a test image of the camera module test target board according to the third embodiment of the present invention.

[0051] Figure 7 is a three-dimensional view of a camera module test target board according to a preferred embodiment of the present invention.

[0052] Figure 8 is a cross-sectional view of the camera module test target board according to the preferred embodiment of the present invention.

[0053] Figure 9 is a schematic diagram of a test image of the camera module test target board according to the preferred embodiment of the present invention.

[0054] Figure 10It is a cross-sectional view of a test target board for a camera module according to a modified embodiment of the above-mentioned preferred embodiment of the present invention.

[0055] Figure 11 It is a perspective view of a test target board for a camera module according to the fourth embodiment of the present invention and a schematic diagram of its state change.

[0056] Figure 12 It is a perspective view of a test target board for a camera module according to some embodiments of the present invention and a schematic diagram of its state change.

[0057] Figure 13 It is a usage scenario diagram of a test target board for a camera module according to the present invention.

[0058] Figure 14 It is a flowchart of a test method for a camera module according to the present invention. Detailed implementation manners

[0059] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles defined in the following description can be applied to other implementation manners, variations, improvements, equivalent manners, and other technical solutions that do not deviate from the spirit and scope of the present invention.

[0060] Those skilled in the art should understand that in the disclosure of the present invention, the orientation or positional relationships indicated by the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limitations on the present invention.

[0061] It can be understood that the term "a" should be understood as "at least one" or "one or more". That is, in one embodiment, the number of one element can be one, while in other embodiments, the number of this element can be multiple. The term "a" should not be construed as a limitation on the quantity.

[0062] As Figures 1 to 14 shown, the present invention provides a test target board for a camera module and a test method for a camera module. The test target board can provide a test image larger than the horizontal size of the test target board main body, so that under the same test image size requirement, the test target board of the present invention requires a smaller volume.

[0063] Specifically, the test target board 100 includes a target board main body 110 and at least one reflection element 120, wherein the reflection element 120 protrudes and extends from a test surface 111 of the target board main body 110. The target board main body 110 is provided with a preset pattern 112 on the test surface 111 for testing the performance of a to-be-tested camera module. A reflection surface 121 of the reflection element 120 is arranged inside the reflection element 120 to mirror the preset pattern 112 and form a mirror image pattern 122. That is to say, the test image 130 of the test target board 100 is formed by the mirror image pattern 122 and the preset pattern 112, as Figure 2 and Figure 9 shown. Compared with the existing all-solid test images, the horizontal dimension of the target board main body 110 of the present invention is smaller, while the size of the test image 130 does not become smaller. In particular, for a wide-angle camera module, the horizontal dimension of the target board main body 110 of the present invention is smaller, but the size of the test image 130 still meets the test requirements.

[0064] Preferably, a special anti-fouling treatment is performed on the reflection surface 121 of the reflection element 120 to prevent dirt from affecting the formation of virtual images and further affecting the calibration accuracy and precision. The reflection element 120 can be composed of, but is not limited to, a coated plane, a plane mirror, or a steel plate with a mirror surface treatment, etc., which are flat plates with a specular reflection function.

[0065] As Figure 1 and Figure 2 shown in the first embodiment of the present invention. In the first embodiment, the number of the reflection elements 120 is implemented as 1, and the reflection element 120 is implemented as a smooth and flat plate such as glass with a mirror plane reflection function. The reflection element 120 is arranged along the edge of the preset pattern 112.

[0066] Taking the example that the reflection element 120 is arranged along one edge of the preset pattern 112 in the Y direction, the preset pattern 112 is mirrored with this edge in the Y direction and extended along the X-axis direction to form a test image 130 as Figure 2 shown. At this time, compared with the prior art providing a solid test image of the same size, the test target board 100 of the present invention makes full use of the direction space of the Z axis to reduce the dimension in the X-axis direction. Similarly, when the reflection element 120 is arranged along one edge of the preset pattern 112 in the X direction, compared with the prior art, the dimension of the test target board 100 in the X-axis direction is reduced, which will not be elaborated here.

[0067] As Figure 3 and Figure 4The second embodiment of the present invention is shown. In the second embodiment, the number of the reflection elements 120 is implemented as 2, and the reflection elements 120 are implemented as smooth flat plates such as glass having a mirror plane reflection function. The two reflection elements 120 are symmetrically disposed on the opposite edges of the preset pattern 112 respectively, and mirror the preset pattern 112. At this time, the mirror pattern 122 symmetrically extends outward along the opposite edges of the preset pattern 112. Compared with the first embodiment, the size of the test image 130 formed in the second embodiment is larger, and the size of the test target 100 can be further reduced.

[0068] Taking the two reflection elements 120 symmetrically disposed on the two edges in the Y-axis direction of the preset pattern 112 as an example, the preset pattern 112 takes the two edges in the Y-axis direction as axes and extends outward in the X-axis direction to form a test image 130 as shown in Figure 4 the figure. Similarly, when the two reflection elements 120 are symmetrically disposed on the two edges in the X-axis direction of the preset pattern 112 respectively, the mirror pattern 122 extends outward from the two edges in the X-axis direction and mirrors the preset pattern 112.

[0069] As shown in Figure 5 and Figure 6 The third embodiment of the present invention is shown. In the third embodiment, the number of the reflection elements 120 is implemented as 2, and the reflection elements 120 are implemented as smooth flat plates such as glass having a mirror plane reflection function. Different from the second embodiment, in the third embodiment, the two reflection elements 120 are disposed adjacent to each other, that is to say, the edges of the two reflection elements 120 are joined to form a semi-surrounding structure. Specifically, one reflection element 120 is disposed closely along the X-axis edge of the preset pattern 112, and the other reflection element 120 is disposed closely along the Y-axis edge of the preset pattern 112, and the adjacent ends of the two reflection elements 120 are joined.

[0070] At this time, one reflection element 120 mirrors the preset pattern 112 so that the preset pattern 112 is extended in the Y-axis direction. The other reflection element 120 mirrors the preset pattern 112 so that the preset pattern 112 is extended in the X-axis direction, as shown in Figure 6 the figure, thereby further reducing the horizontal size. In addition, the adjacent reflection elements 120 connected to each other can mirror each other, reducing the possibility that the obtained mirror pattern 122 has a notch.

[0071] As shown in Figures 7 to 9As described above, this is a preferred embodiment of the present invention, wherein the reflecting element 120A closes and surrounds the preset pattern 112A along the edge of the preset pattern 112A. Here, taking the square preset pattern 112A as an example, where four reflecting elements 120A are connected end to end to form a square, this is not a limitation. Those skilled in the art can know that the reflecting element 120A can also be composed of 1, 2, 3, 5, 6 or other unequal numbers of glass plates to form corresponding closed shapes, that is, the reflecting element 120A can be designed into different shapes and adopt different numbers according to different requirements. For example, the reflecting element can be an arc surface or a toroidal surface.

[0072] The reflecting element 120A closes and surrounds the preset pattern 112A, so that the preset pattern 112A is mirror-expanded and extended with each edge as an axis, as Figure 9 shown. At the same time, since the reflecting element 120A is closed, adjacent reflecting elements 120A can be mirrored to each other, reducing the possibility of the obtained mirror pattern 122A having gaps. In addition, opposite reflecting elements 120A can be mirrored to each other, and the mirror pattern 122A can be infinitely extended. The closed reflecting element 120A defines a light-passing cavity 140A for the camera module under test to obtain the test image 130A.

[0073] Within the field of view angle of the camera module under test, the area of the target board is reduced by adding the reflecting element 120A. The reflecting element 120A forms a virtual image of the preset pattern 112A of the target board main body 110A, and uses the space that is not fully utilized in the vertical direction to reduce the area in the horizontal direction, so as to reduce the area of the target board, and further reduce the volume of the test equipment. The reflecting element 120A is tightly connected to the target board main body 110A. When the two are vertically arranged, a box body without a bottom cover (such as a rectangular box body, a square box body, a rhombic box body, a pentagonal prism box body, a cylindrical box body, etc.) is formed. The reflecting element 120A replicates the preset pattern 112A at the center and combines it with the preset pattern 112A to form a new target board plane, that is, the test image 130A. In particular, the test image 130A can be replicated infinitely large, but the range used for testing is still the size of the original target board pattern.

[0074] As Figure 13As shown, to ensure a complete test, especially for a wide-angle module with a large field of view, the field of view of the camera module to be tested should be smaller than the range of the test image 130 within the range defined by the target board main body 110. Therefore, in the present invention, the height of the reflection element 120, that is, the distance between the free end of the reflection element 120 and the target board main body 110, should be restricted. In other words, the field of view of the camera module to be tested should intersect with the reflection element 120, so as to obtain the mirror image pattern 122 and ensure a complete test. For example, if the maximum field of view of the camera module to be tested is α, the test distance of the camera module to be tested (the distance between the camera module to be tested and the target board main body 110) is b, the corresponding length of the test image required by the camera module to be tested is b*tan(α / 2), and the distance from the reflection element 120 to the center of the target board main body 110 is c, then the height of the reflection element 120 should be not less than b - c / tan(α / 2).

[0075] On the other hand, when the reflection element 120A is implemented as a smooth and flat plate such as glass with a mirror plane reflection function, the thickness of the element itself will cause a certain degree of refractive imaging, which will double-image with the mirror image pattern 122A, thus affecting the test. Therefore, the smaller the thickness of the reflection element 120A, the better. Preferably, the thickness of the reflection element 120A is less than 6 mm and can be implemented as 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, etc. without limitation.

[0076] Furthermore, the reflection element 120A has an auxiliary film 123A, where the auxiliary film 123A covers the surface of the reflection surface 121A to reduce the influence caused by refraction. For example, the auxiliary film 123A can be implemented as a magnetron sputtering coating, etc., to enhance reflection and weaken refraction, thereby increasing the fitting degree between the mirror image pattern 122A and the preset pattern 112A.

[0077] In a preferred embodiment of the present invention, to avoid deformation and distortion of the mirror image pattern 122A to the greatest extent, the reflection element 120A extends vertically from the test surface 111A of the target board main body 110A. That is to say, the reflection element 120A and the target board main body 110A are perpendicular to each other. In particular, the fixed end of the reflection element 120A fits seamlessly with the test surface 111A to avoid image distortion after mirroring near the fixed end.

[0078] As Figure 10As shown in the figure, it is a modified embodiment of the above preferred embodiment. Different from the above embodiment, in this modified embodiment, the reflecting element 120B includes a reflecting film 124B and an auxiliary plate 125B, wherein the reflecting film 124B is attached to the inner side of the auxiliary plate 125B to form the reflecting surface 121B. For example, the reflecting element 120B is implemented as a smooth and flat metal plate with mirror surface treatment, etc. That is to say, in this modified embodiment, the thickness of the reflecting film 124B is extremely small, and its influence on the mirror image pattern can be ignored.

[0079] As Figure 11 shown in the figure, it is the fourth embodiment of the test target board of the present invention. The test target board 100C includes a target board main body 110C and a reflecting element 120C, wherein the reflecting element 120C extends from a test surface 111C of the target board main body 110C and encloses a preset pattern 112C of the test surface 111C. A reflecting surface 121C of the reflecting element 120C forms a mirror image pattern 122C by mirror imaging of the preset pattern 112C.

[0080] Those skilled in the art can know that the reflecting element 120C can be implemented as a smooth and flat plate with mirror plane reflection function such as glass, or can be implemented as a smooth and flat metal plate with mirror surface treatment, etc., which is not limited in this embodiment.

[0081] Different from the above preferred embodiment and its modified embodiment, the reflecting element 120C is movably mounted on the test surface 111C of the target board main body 110C. Specifically, in the second embodiment of the present invention, the reflecting element 120C is rotatably mounted on the test surface 111C of the target board main body 110C, so that the included angle between the target board main body 110C and the reflecting element 120C can be changed to adapt to different performance tests.

[0082] The test target board 100C further includes a rotating device 150C, wherein the rotating device 150C is mounted between the target board main body 110C and the reflecting element 120C to realize the angle adjustment between the two.

[0083] In some embodiments of the present invention, the rotation device 150C can be implemented in a pivoting manner. The target plate body 110C has an installation cavity 151C, which is located outside the preset pattern 112C and is adjacent to the preset pattern 112C. A pivot shaft 152C is fixed in the installation cavity 151C, and the pivot shaft 152C extends along the periphery of the preset pattern 112C. The reflection element 120C has a pivot cavity 153C formed at the fixed end. The pivot cavity 153C is coupled to the pivot shaft 152C so that the reflection element 120C can rotate around the pivot shaft 152C. To avoid incomplete mirroring and image tomography, when the reflection element 120C rotates to the maximum angle, the reflection surface 121C still abuts against the preset pattern 112C to achieve seamless mirroring. Preferably, the cavity wall of the pivot cavity 153C is in frictional contact with the pivot shaft 152C, so as to fix the rotation angle of the reflection element 120C by using frictional force, or achieve rotational positioning by using interference fit, fastening elements, etc. The present invention is not limited thereto.

[0084] A transition device 170C is provided at the connection of the sides of adjacent reflection elements 110C to ensure that the reflection elements 110C still form a closed shape after rotation and are connected to the test surface 111C to avoid mirror tomography. That is to say, the transition device 170C is movably connected to the sides of adjacent reflection elements 110C, and its bottom edge is connected to the test surface 111C. The inner side surface of the transition device 170C is a reflection surface for mirroring the preset pattern 112C. For example, the transition device 170C can be implemented as a stretchable film with a reflection surface on the inner side.

[0085] In addition, the reflection element can be moved in the X and Y axis directions relative to the surface of the target plate body through a moving mechanism, such as a lead screw, a linear motor, etc., or the reflection element can be set to be height adjustable or moved in the Z axis direction through a lifting device, etc., so as to facilitate the adjustment of the test target plate during use, as Figure 12 shown. Generally speaking, the target plate body and the reflection element can be designed as an integral body, that is, the positions between them are kept fixed, or they can be designed as a separable body that can move relative to each other to meet different test requirements and facilitate adjustment.

[0086] It is worth mentioning that the test target board 100C includes a precision assisting device 160C for ensuring the installation and test precision. For example, the precision assisting device 160C is implemented as a spirit level or a laser rangefinder to ensure the relative levelness between the target board main body 110C and the camera module to be tested. Or the precision assisting device 160C is implemented as an angle gauge to measure the angle between the reflecting element 120C and the target board main body 110C.

[0087] During the test, a camera module testing device uses the above-mentioned test target board 100, occupying less space and eliminating the need for a large target board to meet the test requirements. As Figure 13 shown, miniaturization of the device has been achieved.

[0088] The camera module testing device includes a target board fixing device 200 and a module fixing device 300. The module fixing device 300 fixes the camera module to be tested, and the target board fixing device 200 supports the test target board 100 on the top side of the fixed camera module, that is, within the field of view angle range. When in use, the reflecting element 120 is located below the target board main body 110 and extends downward from the test target board main body 110.

[0089] Furthermore, the camera module testing device includes a position control device 400 for adjusting the spatial positions of the target board main body 110 and / or the reflecting element 120 so that the test target board 100 can be adjusted accordingly according to the field of view angle and angle of the camera module to be tested. The position control device 400 can be implemented as a hinge, a lead screw, a linear motor, etc., and the present invention is not limited thereto.

[0090] In some embodiments of the present invention, the position control device 400 is implemented as a robotic arm that moves in the X, Y, and Z axes, or a robotic arm that moves in the X and Y axes and has adjustable height, etc. The position control device 400 is coupled to the target board fixing device 200, and the movement of the position control device 400 drives the movement of the target board fixing device 200, so that the target board main body 110 moves accordingly, realizing the movement of the target board main body 110 in the X, Y, and Z axes. Combining the foregoing design for realizing the movement of the reflecting element in the X, Y, and Z axes, omnidirectional adjustment of the test target board 100 can be achieved. Of course, those skilled in the art can know that, according to requirements, both the target board main body and the reflecting element can move in the three directions of X, Y, and Z; or the target board main body can move in at least one of the X, Y, and Z directions; the reflecting element can move in at least one of the X, Y, and Z directions, and the present invention is not limited thereto.

[0091] The image acquired by the camera module to be tested is transmitted to a programming and analysis module 500, and the programming and analysis module 500 analyzes and calibrates the performance of the camera module to be tested according to the received image. When the reflection element 120 and the target board body 110 are not perpendicular, the mirror pattern 122 will be deformed to a certain extent. The programming and analysis module 500 can calculate the degree of deformation based on the included angle value, etc., so as to eliminate the influence caused by the deformation.

[0092] In some embodiments of the present invention, the camera module testing device can ensure the angle between the reflection element and the target board body through an installation assistance mechanism, such as an angle gauge, etc.

[0093] Those skilled in the art should understand that the test target board 100 can be applied to existing testing devices without changing the testing devices.

[0094] According to another aspect of the present invention, the present invention further provides a method for testing a camera module, which uses the above-mentioned test target board to achieve the above-mentioned advantages and purposes, such as Figure 13 and 14 as shown.

[0095] Step 610: Fix a camera module to be tested and a test target board, so that the test range of the camera module to be tested is smaller than the size of the test image provided by the test target board, where the test image is a virtual-real combined test image.

[0096] The reflection element mirror-copies the preset pattern, and the formed mirror pattern is mirror-connected to the preset pattern to form the virtual-real combined test image. For example, the various implementation structures of the test target board mentioned in the above embodiments will not be elaborated here.

[0097] The test range is the range defined by the field of view angle of the camera module to be tested on the horizontal plane of a target board body of the test target board, as Figure 13 shown by the part defined by the dotted circle. In the prior art, the test range is the range defined by the intersection of the boundary rays of the field of view angle of the camera module to be tested and the physical test target board. In the present invention, the test range is the range defined by the intersection of the boundary rays of its field of view angle and the reflection element, and then the intersection with the mirror pattern formed by mirroring.

[0098] Step 612: The camera module to be tested captures the virtual-real combined test image to form a captured image.

[0099] During the test, the camera module to be tested and the test device are powered to enable the camera module to be tested to start working, capture the virtual-real combined test image, and form the captured image.

[0100] Step 614: Analyze the performance of the camera module to be tested according to the captured image and the virtual-real combined test image.

[0101] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention. The object of the present invention has been fully and effectively achieved. The functions and structural principles of the present invention have been shown and described in the embodiments, and without departing from the said principles, the embodiments of the present invention can have any deformation or modification.

Claims

1. A camera module test target board, characterized in that Comprising: A transition device; A reticle body, wherein the reticle body has a preset pattern on a test surface; And At least one reflection element, wherein the reflection element extends from the test surface and is arranged along the edge of the preset pattern. An inner side of the reflection element has a reflection surface that mirrors the preset pattern to form a mirror image pattern. The mirror image pattern and the preset pattern form a test image. The reflection element is movably held on the reticle body. The transition device is movably connected to adjacent sides of the reflection element, and its bottom side is connected to the test surface to keep the reflection elements closed end to end. An inner side surface of the transition device is a reflection surface.

2. The camera module test reticle according to claim 1, wherein the mirror image pattern and the preset pattern are seamlessly connected.

3. The camera module test reticle according to claim 1, wherein adjacent reflection elements are spaced apart along the edge of the preset pattern.

4. The camera module test reticle according to claim 1, wherein two reflection elements are symmetrically arranged on opposite edges of the preset pattern.

5. The camera module test reticle according to claim 1, wherein adjacent edges of the reflection elements are correspondingly arranged in contact with adjacent edges of the preset pattern.

6. The camera module test reticle according to claim 1, wherein the reflection elements surround the preset pattern in a closed manner.

7. The camera module test reticle according to any one of claims 1 to 6, wherein the reflection element is implemented as a smooth and flat plate with a mirror plane reflection function.

8. The camera module test reticle according to claim 7, wherein the thickness of the reflection element is less than 6 mm.

9. The camera module test reticle according to claim 8, wherein the reflection element has an auxiliary film, and the auxiliary film covers the surface of the reflection surface to enhance the fitting degree between the mirror image pattern and the preset pattern.

10. The camera module test reticle according to claim 9, wherein the auxiliary film is implemented as a magnetron sputtering coating.

11. The camera module test reticle according to any one of claims 1 to 6, wherein the reflection element includes a reflection film and an auxiliary plate, and the auxiliary plate extends from the test surface end to end and surrounds the preset pattern in a closed manner.

12. The camera module test reticle according to any one of claims 1 to 6, wherein the reflection element and the reticle body are arranged perpendicular to each other.

13. The camera module test reticle according to claim 7, wherein the reflection element and the reticle body are arranged perpendicular to each other.

14. The camera module test reticle according to claim 11, wherein the reflection element and the reticle body are arranged perpendicular to each other.

15. The camera module test reticle according to claim 11, wherein the reflection film is attached to the inner side of the auxiliary plate to form the reflection surface.

16. The test target board for a camera module according to claim 15, further comprising a rotating device, wherein the rotating device rotatably holds the reflecting element on the target board body, so that the reflecting element rotates relative to the target board body.

17. The test target board for a camera module according to claim 15, further comprising a moving mechanism, wherein the moving mechanism movably holds the reflecting element on the target board body, so that the reflecting element moves in the X and / or Y axis directions relative to the surface of the target board body.

18. The test target board for a camera module according to claim 15, wherein the reflecting element is held on the target board body in a height-adjustable manner.

19. The test target board for a camera module according to any one of claims 1 to 5, further comprising an accuracy assisting device, wherein the accuracy assisting device is installed on the target board body for testing the relative levelness between the target board body and a camera module to be tested.

20. The test target board for a camera module according to claim 19, wherein the accuracy assisting device is implemented as a spirit level or a laser rangefinder.

21. The test target board for a camera module according to claim 6, further comprising an accuracy assisting device, wherein the accuracy assisting device is installed on the target board body for testing the relative levelness between the target board body and a camera module to be tested.

22. The test target board for a camera module according to any one of claims 1 to 5, further comprising an accuracy assisting device, wherein the accuracy assisting device is installed on the target board body for measuring the angle between the reflecting element and the target board body.

23. The test target board for a camera module according to claim 6, further comprising an accuracy assisting device, wherein the accuracy assisting device is installed on the target board body for measuring the angle between the reflecting element and the target board body.

24. A method for testing a camera module, using the camera module test reticle according to any one of the preceding claims 1-23, characterized in that, Comprising: (a) Fixing a camera module to be tested and a test target board, such that the test range of the camera module to be tested is smaller than the size of the test image provided by the test target board, wherein the test image is a virtual-real combined test image; (b) The camera module to be tested captures the virtual-real combined test image to form a captured image; and (c) Analyzing the performance of the camera module to be tested according to the captured image and the virtual-real combined test image, wherein in step (a), the virtual-real combined test image is formed by a mirror pattern and a preset pattern, wherein the mirror pattern is formed by at least one reflecting element disposed at the edge of the preset pattern and mirroring the preset pattern, and wherein the relationship among the maximum field of view angle α of the camera module to be tested, the test distance b of the camera module to be tested, the distance c from the reflecting element to the center of the target board body of the test target board, and the height h of the reflecting element is: h is not less than b - c / tan(α / 2).

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