Camera module multi-angle out-of-focus curve testing device

Abstract

The invention relates to the field of camera manufacturing, and discloses a camera module multi-angle out-of-focus curve testing device, which is characterized by comprising a base; a clamp for fixing a camera is arranged on the mounting seat in a sliding manner, and a sliding rail for the clamp to move is constructed on the mounting seat; the swing arm is arranged on the base and can rotate relative to the surface of the base, and the rotating axis of the swing arm is perpendicular to the length direction of the sliding rail; the collimator is arranged on the swing arm, and the collimator is arranged to be capable of moving in the length direction of the swing arm. The technical scheme has the beneficial effects that the camera is fixed on the mounting seat through the clamp, and is adjusted to be right below the collimator through the sliding rail. The distance between the collimator and the camera is adjusted to facilitate the defocus curve test. The swing arm is rotated to change the included angle between the axis of the collimator and the optical axis of the camera, so that defocus curves at different angles are measured.

Description

Technical Field

[0001] This invention relates to the field of camera manufacturing technology, specifically to a multi-angle defocus curve testing device for camera modules. Background Technology

[0002] Currently, back focus shift testing of camera modules mostly uses collimators with a fixed optical axis. While this can obtain the peak position of the modulation transfer function in a single direction, it cannot evaluate the defocus characteristics of the camera module at different angles. In practical applications, the optical axis of the camera module may shift due to assembly tilt, structural deformation, or changes in the usage environment, thus affecting image quality. Existing technologies lack systematic testing methods for the multi-angle defocus behavior of camera modules, making it difficult to comprehensively evaluate their optical performance in actual use. Summary of the Invention

[0003] The purpose of this invention is to provide a multi-angle defocus curve testing device for camera modules to solve the problems mentioned in the background art.

[0004] One aspect of the present invention provides a technical solution: a multi-angle defocus curve testing device for a camera module, comprising: a base; a mounting base, on which a clamp for fixing a camera is slidably disposed, and a slide rail for moving the clamp is constructed on the mounting base; a swing arm, which is disposed on the base and configured to rotate relative to the surface of the base, the axis of rotation of the swing arm being perpendicular to the length direction of the slide rail; and a collimator, which is arranged on the swing arm and located above the mounting base, and is configured to move along the length direction of the swing arm.

[0005] The beneficial effects of the above technical solution are as follows: the camera is fixed to the mounting base by a clamp and adjusted to be directly below the collimator via a slide rail. Adjusting the distance between the collimator and the camera facilitates defocus curve testing. Rotating the swing arm changes the angle between the axis of the collimator and the optical axis of the camera, thereby measuring defocus curves at different angles.

[0006] Furthermore, a stepper motor for driving the swing arm is installed on the base, and a mounting slot for arranging the stepper motor is constructed directly below the swing arm on the base, with the shaft of the stepper motor connected to the axis of the swing arm.

[0007] Furthermore, a support base is constructed on the base to connect with the swing arm, and an arc-shaped groove is constructed on the support base for the swing arm to swing. The arc-shaped groove is cut from a part of a whole circle, and an arc-shaped slider is constructed at the bottom of the swing arm to match the arc-shaped groove.

[0008] Furthermore, a marker plate with angular markings is provided on the base. The marker plate is located directly in front of the swing arm. An indicator rod is fixed to the front of the swing arm, extending to the front of the marker plate. A pointer parallel to the marker plate is fixed to the end of the indicator rod.

[0009] Furthermore, the parallel light tube is connected to the swing arm via a lifting seat, and a sliding groove is constructed on the swing arm, while a protrusion matching the sliding groove is provided on the lifting seat.

[0010] Furthermore, the swing arm is also equipped with a lead screw that drives the lifting seat. The top of the lead screw extends out of the swing arm and is connected to a handle. A nut that is screwed to the lead screw is fixed on the lifting seat.

[0011] Furthermore, an auxiliary plate is provided on the base, and the auxiliary plate and the swing arm are arranged in parallel at intervals. Multiple adjustment points are arranged at equal angles on the auxiliary plate, and a strong magnet is fixed at each adjustment point. An adjustment handle is fixed on the side of the swing arm facing the auxiliary plate, and an adjustment magnet corresponding to the strong magnet is fixed on the adjustment handle. The polarity of the adjustment magnet is opposite to that of the side facing the strong magnet.

[0012] Furthermore, an engagement component is provided between the swing arm and the auxiliary plate. When no external force is involved, the engagement component bites the outer edge of the auxiliary plate, and the engagement component disengages from the auxiliary plate under the action of external force.

[0013] Another aspect of the present invention provides a technical solution: a multi-angle defocus curve testing device for a camera module, comprising: Base; The swing arm has its front end rotatably mounted on the base and its rear end slidably connected to the base. The axis of rotation of the swing arm is perpendicular to the plane of the base. A collimator is arranged on the swing arm, and the collimator is configured to move along the length of the swing arm. The mounting base is located near the front end of the swing arm. A clamp for fixing the camera is slidably mounted on the mounting base. The camera's shooting direction is towards the collimator. The mounting base is constructed with a slide rail for the clamp to move. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention; Figure 2 This is a side view of an embodiment of the present invention; Figure 3 This is a schematic diagram of the auxiliary plate in an embodiment of the present invention; Figure 4 This is a schematic diagram of the horizontally arranged swing arm in an embodiment of the present invention.

[0015] In the diagram: base 100, arc-shaped slide 110, mounting base 200, clamp 210, camera 300, swing arm 400, shaft 401, lifting seat 410, adjusting magnet 420, parallel light tube 500, sign plate 600, pointer 610, auxiliary plate 700, strong magnet 710, and engagement assembly 720. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] like Figure 1-4 As shown, this embodiment provides a multi-angle defocus curve testing device for a camera module, including: a base 100 for providing basic support to ensure the stability of the testing device; a mounting base 200 on which a clamp 210 for fixing a camera 300 is slidably disposed, and a slide rail for moving the clamp 210 is constructed on the mounting base 200; a swing arm 400 disposed on the base 100 and configured to rotate relative to the surface of the base 100, the axis of rotation of the swing arm 400 being perpendicular to the length direction of the slide rail; and a parallel light tube 500 disposed on the swing arm 400 and located above the mounting base 200, the parallel light tube 500 being configured to move along the length direction of the swing arm 400, and the parallel light tube 500 being positioned above the mounting base 200 to ensure that it can illuminate the camera 300. The base 100 has a large working surface on its top, which lowers the overall center of gravity of the testing device, making the testing device more stable.

[0018] During testing, the camera 300 is fixed to the mounting base 200 using the clamp 210 and adjusted to be directly below the collimator 500 via the slide rail. Adjusting the distance between the collimator 500 and the camera 300 facilitates defocus curve testing. Rotating the swing arm 400 changes the angle between the axis of the collimator 500 and the optical axis of the camera 300, thereby measuring the defocus curves at different angles.

[0019] In some embodiments, to facilitate and accurately adjust the angle of the swing arm 400, a stepper motor driving the swing arm 400 is mounted on the base 100. A mounting groove is constructed on the base 100 directly below the swing arm 400 for mounting the stepper motor, and the shaft of the stepper motor is connected to the axis of the swing arm 400. The swing arm 400 can be suspended, meaning it is only fixedly connected to the shaft of the stepper motor via its shaft. Alternatively, the swing arm 400 can be rotatably mounted on the base 100. A support base is constructed on the base 100 to connect with the swing arm 400. The support base has an arc-shaped groove for the swing arm 400 to swing. The arc-shaped groove is a portion of a complete circle to ensure smooth rotation of the swing arm 400. Specifically, an arc-shaped slider matching the arc-shaped groove is constructed at the bottom of the swing arm 400, and flanges are provided on both sides of the arc-shaped groove to prevent the arc-shaped slider from radially disengaging.

[0020] See Figure 2 In some embodiments, to clearly define the rotation angle of the swing arm 400, a marker plate 600 with angle markings is provided on the base 100, located directly in front of the swing arm 400. An indicator rod is fixed to the front of the swing arm 400, extending to the front of the marker plate 600. A pointer 610 parallel to the marker plate 600 is fixed to the end of the indicator rod, and the rotation angle of the swing arm 400 is determined by the angle markings indicated by the pointer 610. Furthermore, the indicator rod extends from the top of the marker plate 600. To accommodate the rotation trajectory of the indicator rod, the top of the marker plate 600 is constructed in an arc shape, with the center of the arc located on the axis of the swing arm 400. Even further, the indicator rod can pass through the marker plate 600, which has an arc-shaped hole for the indicator rod to pass through and swing.

[0021] In some embodiments, to facilitate adjustment of the distance between the collimator 500 and the camera 300 under test, the collimator 500 is connected to the swing arm 400 via a lifting seat 410. A groove is constructed on the swing arm 400, and a protrusion matching the groove is provided on the lifting seat 410. Furthermore, a lead screw for driving the lifting seat 410 is also provided on the swing arm 400. The top end of the lead screw extends out of the swing arm 400 and is connected to a handle. A nut screwed to the lead screw is fixed on the lifting seat 410. Rotating the lead screw moves the lifting seat 410 along the length of the swing arm 400. The adjusted lifting seat 410 will remain in the adjusted position. The friction between the lead screw and the nut prevents the lifting seat 410 from moving easily, ensuring that the collimator 500 and the camera 300 do not change during the experiment. Furthermore, a scale for displaying length is provided on the surface of the swing arm 400, and the lower edge of the lifting seat 410 is parallel to the scale. The specific displacement of the collimator 500 during adjustment can be determined by the relative position of the lower edge of the lifting seat 410 and the scale.

[0022] See Figure 2-3In some embodiments, to facilitate the adjustment of the angle of the swing arm 400, an auxiliary plate 700 is provided on the base 100, and the auxiliary plate 700 and the swing arm 400 are arranged parallel to each other at intervals. Multiple adjustment points are arranged at equal angles on the auxiliary plate 700, and the included angle between adjacent adjustment points is the minimum angle to be adjusted. A strong magnet 710 is fixed at each adjustment point, and each strong magnet 710 has the same magnetic properties facing the swing arm 400. An adjustment handle is fixed on the side of the swing arm 400 facing the auxiliary plate 700, and an adjustment magnet 420 corresponding to the strong magnet 710 is fixed on the adjustment handle. The polarity of the adjustment magnet 420 is opposite to that of the side facing the strong magnet 710. When changing the angle of the swing arm 400, an external force is used to remove the adjustment magnet 420 from the currently attracted strong magnet 710 and move it to the position of the next strong magnet 710. When the strong magnet 710 is moved to the desired adjustment position, the adjusting magnet 420 and the strong magnet 710 are tightly attracted again to fix the swing arm 400 in place. After the strong magnet 710 and the adjusting magnet 420 complete their magnetic attraction, a basic connection is provided for the stability of the swing arm 400. However, this connection is not particularly strong. To further enhance the stability of the swing arm 400 after adjustment, an engagement component 720 is provided between the swing arm 400 and the auxiliary plate 700. After the swing arm 400 is adjusted to the desired position, the engagement component 720 can hold the swing arm 400 in its current position.

[0023] The engagement assembly 720 includes a pair of coupled clamping arms. The lower ends of the clamping arms are brought closer together by a spring to clamp the auxiliary plate 700. The upper ends of the clamping arms are operating handles. Pressing the operating handles will open the lower ends of the clamping arms, allowing the swing arm 400 to rotate again.

[0024] See Figure 4 In some embodiments, to improve the mechanical structure of the swing arm 400 and prevent the supporting force of the swing arm 400 from concentrating at the lower part, the swing arm 400 is laid flat on the base 100, so that both ends of the swing arm 400 can be supported. Specifically, the axis of rotation of the swing arm 400 is perpendicular to the plane of the base 100. The mounting base 200 is located at the front end of the rotatable connection between the swing arm 400 and the base 100, and is spaced apart from the swing arm 400. The parallel light tube 500 mounted on the swing arm 400 can illuminate the camera 300 on the mounting base 200. Specifically, to facilitate the rotation of the swing arm 400, the front end of the swing arm 400 is connected to the base 100 through a shaft 401, and the rear end of the swing arm 400 is connected to the arc-shaped groove 110 of the base 100 through a slider.

[0025] In the description of this application, it should be understood that the terminology used is for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly defined.

[0026] In this application, unless otherwise expressly specified and limited, the terms "connected," "linked," "fixed," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0027] Numerous specific details are set forth in this specification. However, it will be understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, systems, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. A multi-angle defocus curve testing device for a camera module, characterized in that, include: Base; Mounting base, on which a clamp for fixing the camera is slidably mounted, and the mounting base is constructed with a slide rail for the clamp to move; A swing arm is disposed on the base and configured to rotate relative to the surface of the base, wherein the axis of rotation of the swing arm is perpendicular to the length direction of the slide rail. A collimator is arranged on the swing arm and above the mounting base, and the collimator is configured to move along the length of the swing arm.

2. The multi-angle defocus curve testing device for a camera module according to claim 1, characterized in that, The base is equipped with a stepper motor that drives the swing arm. The base has a mounting slot for arranging the stepper motor directly below the swing arm. The shaft of the stepper motor is connected to the axis of the swing arm.

3. The multi-angle defocus curve testing device for a camera module according to claim 2, characterized in that, A support base is constructed on the base to connect with the swing arm. An arc-shaped groove is constructed on the support base for the swing arm to swing. The arc-shaped groove is cut from a part of a whole circle. An arc-shaped slider that matches the arc-shaped groove is constructed at the bottom of the swing arm.

4. The multi-angle defocus curve testing device for a camera module according to claim 1, characterized in that, The base is provided with a marker plate with angular markings. The marker plate is located directly in front of the swing arm. An indicator rod is fixed to the front of the swing arm and extends to the front of the marker plate. A pointer parallel to the marker plate is fixed to the end of the indicator rod.

5. The multi-angle defocus curve testing device for a camera module according to claim 1, characterized in that, The parallel light tube is connected to the swing arm via a lifting seat. A sliding groove is constructed on the swing arm, and a protrusion matching the sliding groove is provided on the lifting seat.

6. The multi-angle defocus curve testing device for a camera module according to claim 5, characterized in that, The swing arm is also equipped with a lead screw that drives the lifting seat. The top of the lead screw extends out of the swing arm and is connected to a handle. A nut that is screwed to the lead screw is fixed on the lifting seat.

7. The multi-angle defocus curve testing device for a camera module according to claim 1, characterized in that, An auxiliary plate is provided on the base. The auxiliary plate and the swing arm are arranged in parallel at intervals. Multiple adjustment points are arranged at equal angles on the auxiliary plate. A strong magnet is fixed at each adjustment point. An adjustment handle is fixed on the side of the swing arm facing the auxiliary plate. An adjustment magnet corresponding to the strong magnet is fixed on the adjustment handle. The polarity of the adjustment magnet is opposite to that of the side facing the strong magnet.

8. The multi-angle defocus curve testing device for a camera module according to claim 7, characterized in that, An engagement component is also provided between the swing arm and the auxiliary plate. The engagement component bites the outer edge of the auxiliary plate when no external force is involved, and disengages from the auxiliary plate under the action of external force.

9. A multi-angle defocus curve testing device for a camera module, characterized in that, include: Base; A swing arm, the front end of which is rotatably mounted on the base, and the rear end which is slidably connected to the base, wherein the axis of rotation of the swing arm is perpendicular to the plane of the base; A collimator is arranged on the swing arm, and the collimator is configured to move along the length direction of the swing arm. A mounting base is arranged near the front end of the swing arm. A clamp for fixing the camera is slidably mounted on the mounting base. The camera's shooting direction is towards the collimator. A slide rail is constructed on the mounting base for the clamp to move.

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