AA glue thickness control method and control tool based on pre-focusing

Abstract

The application relates to the technical field of camera production, and particularly discloses an AA glue thickness control method based on pre-focusing and a control tool. The method comprises the following steps: sequentially stacking and fixing a printed circuit board, a gasket and a lens assembly from bottom to top; adjusting the lens assembly to a first clear position; removing the gasket and performing glue dispensing at a gap position between the lens assembly and the printed circuit board; and adjusting the lens assembly to a second clear position. The method realizes the control of glue thickness error in the mode of additionally arranging a pre-focusing step, and improves the yield of products.

Description

Technical Field

[0001] This invention relates to the field of camera manufacturing technology, and in particular to an AA adhesive thickness control method and control tooling based on pre-focusing. Background Technology

[0002] With the increasing demand for large-aperture, wide-angle, and high-resolution camera modules in the security industry, the requirements for short depth of focus and flatness between the lens and the image sensor are also gradually increasing. Existing focusing technologies cannot meet these requirements, thus necessitating the introduction of AA (Active Alignment) technology. AA technology effectively calibrates flatness and optical center deviation, improving the image quality of the camera module. However, controlling the thickness of the AA adhesive used to bond the lens assembly to the image sensor on the printed circuit board has become a challenge in the AA process. Because AA adhesive requires high-temperature thermosetting, improper thickness control can lead to adhesive variations, causing significant changes in the module's back focus and severely impacting the image quality, reliability, and adhesion of the camera module.

[0003] In existing technologies, the pre-focusing method does not take into account the influence of tolerances. The TTL tolerance of security lenses is ±0.2 mm, and the tolerance of image sensor chips is ±0.1 mm. When these tolerances are combined, the difference between the actual adhesive thickness and the target adhesive thickness is between -0.3 mm and 0.3 mm. At this time, the adhesive thickness error is relatively large, and the adhesive thickness is prone to fluctuation due to the problem of incoming lens materials. Consistency cannot be guaranteed, which makes it difficult to achieve adhesive thickness control. Summary of the Invention

[0004] The purpose of this invention is to provide a pre-focus-based AA adhesive thickness control method and control fixture to solve the problem of large adhesive thickness error, improve the image quality, reliability and adhesion of the camera module, and ensure the yield of finished products.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A method for controlling AA adhesive thickness based on pre-focusing, the method comprising:

[0007] The printed circuit board, gasket, and lens assembly are stacked and fixed from bottom to top;

[0008] Adjust the lens assembly to the first clear position;

[0009] Remove the gasket and apply adhesive to the gap formed between the lens assembly and the printed circuit board;

[0010] Adjust the lens assembly to the second clear position.

[0011] As an optional technical solution for the above-mentioned pre-focus-based AA coating thickness control method, adjusting the lens assembly to the first sharp position includes:

[0012] Adjust the relative positions of the lens mount and the lens body of the lens assembly to adjust the lens assembly to the first clear position.

[0013] As an optional technical solution for the above-mentioned AA glue thickness control method based on pre-focusing, adjusting the relative position of the lens body and the lens mount includes:

[0014] An image detector is disposed above the lens body;

[0015] The relative position of the lens body and the lens mount is adjusted based on the image acquired by the image detector.

[0016] As an optional technical solution for the above-mentioned AA coating thickness control method based on pre-focusing, after adjusting the lens assembly to the first sharp position, the method further includes:

[0017] The lens body is bonded to the lens mount.

[0018] As an optional technical solution for the above-mentioned pre-focus-based AA coating thickness control method, after adjusting the lens assembly to the second sharp position, the method further includes:

[0019] A high-temperature thermosetting adhesive is used to form an adhesive layer in the gap between the lens assembly and the printed circuit board.

[0020] As an optional technical solution for the above-mentioned AA adhesive thickness control method based on pre-focusing, the printed circuit board is provided with a photosensitive chip, which is positioned opposite to the lens assembly.

[0021] The AA adhesive thickness control fixture based on pre-focusing is applicable to the AA adhesive thickness control method based on pre-focusing described in any one of the above-mentioned methods, wherein the fixture includes:

[0022] The pre-focusing module is used to carry and fix the printed circuit board, gaskets, and lens assembly;

[0023] A support platform for supporting the printed circuit board and the lens assembly that are glued together on the pre-focusing module;

[0024] A clamping arm that can clamp and adjust the position and height of the lens assembly on the support platform.

[0025] As an optional technical solution for the aforementioned AA adhesive thickness control fixture based on pre-focusing, the pre-focusing module includes a fixture base. The fixture base is provided with a first positioning component for positioning the pad, a second positioning component for positioning the printed circuit board, and a fixing component for fixing the lens assembly. The lens assembly is fixed on the fixture base, and the lens assembly can press the pad and the printed circuit board onto the fixture base.

[0026] As an optional technical solution for the aforementioned AA glue thickness control fixture based on pre-focusing, the first positioning component includes at least two first positioning posts disposed on the fixture base, and the gasket is provided with first positioning holes for the first positioning posts to pass through; and / or

[0027] The second positioning component includes at least two second positioning posts disposed on the tooling base, and the printed circuit board is provided with second positioning holes through which the second positioning posts pass.

[0028] As an optional technical solution for the aforementioned AA glue thickness control fixture based on pre-focusing, the fixing component includes two opposing base brackets. One end of each base bracket is connected to the fixture base, and the other end of each base bracket is provided with a positioning element for positioning the lens assembly and a locking element for fixing the lens assembly.

[0029] The beneficial effects of this invention are:

[0030] This pre-focusing-based AA (Adhesive-Ascending) adhesive thickness control method performs pre-focusing before AA focusing. A spacer with the same thickness as the adhesive layer formed by the dispensing adhesive is pre-set, simulating the cured adhesive thickness. The spacer is placed between the lens assembly and the printed circuit board (PCB) before pre-focusing. At this point, the relative gap between the lens assembly and the PCB to achieve a clear image can be determined, and the gap thickness is similar to the spacer thickness. AA focusing is performed after pre-focusing to determine the relative position of the lens assembly and the PCB. This allows for precise control of the adhesive layer thickness, spacer thickness, and relative gap, ultimately achieving effective control of the cured adhesive thickness. This effectively reduces errors caused by adhesive curing and improves the image quality, reliability, and adhesion of the manufactured camera module. By adding pre-focusing before AA focusing, effective control of the cured adhesive thickness is achieved. This method is simple, convenient, and easy to use, and can effectively improve the efficiency of AA focusing and the first-pass yield.

[0031] This pre-focus-based AA adhesive thickness control fixture, through the inclusion of a pre-focus module, enables precise positioning of the gasket, lens assembly, and printed circuit board. It allows for the simulation of adhesive curing with a pre-set, known thickness gasket. After removing the gasket, the gap between the lens assembly and the printed circuit board represents the adhesive layer thickness. Adhesive is applied to the pre-focus module to pre-fix the printed circuit board and lens assembly. The connected printed circuit board and lens assembly are then placed on a support platform. The clamping arm adjusts the height of the lens assembly relative to the printed circuit board, ensuring accurate and controllable adjustment of the gap between them. This guarantees the effective completion of pre-focusing and AA focusing operations on the camera module. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the pre-focusing module provided in an embodiment of the present invention;

[0033] Figure 2 This is an exploded view of the pre-focusing module provided in an embodiment of the present invention;

[0034] Figure 3 This is a schematic diagram of the structure of the base body provided in an embodiment of the present invention;

[0035] Figure 4 This is a schematic diagram of the structure of the clamping arm, the support platform, and the camera module provided in an embodiment of the present invention;

[0036] Figure 5 This is a flowchart of the AA adhesive thickness control method based on pre-focusing provided in an embodiment of the present invention.

[0037] In the picture:

[0038] 100. Tooling base; 110. Base body; 111. Receiving groove; 112. First positioning post; 113. Second positioning post; 114. First mounting hole; 120. Base bracket; 121. Bracket positioning post; 122. Second mounting hole; 123. Third mounting hole; 130. Base locking component; 200. Gasket; 210. Clearance hole; 220. First positioning hole; 300. Lens assembly; 310. Lens mount; 311. Fourth mounting hole; 312. Third positioning hole; 320. Lens body; 400. Printed circuit board; 410. Second positioning hole; 420. Photosensitive chip; 500. Lens locking component; 600. Clamping arm; 700. Support platform. Detailed Implementation

[0039] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. 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.

[0040] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions. Furthermore, "above," "on top of," and "over" the first feature in relation to the second feature includes the first feature directly above and diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature includes the first feature directly below and diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0041] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0042] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0043] like Figures 1-4As shown, this embodiment provides an AA adhesive thickness control fixture based on pre-focusing. The fixture includes a support platform 700, a clamping arm 600, and a pre-focusing module. The pre-focusing module is used to support and fix the printed circuit board 400, the gasket 200, and the lens assembly 300. The pre-focusing module enables accurate positioning of the gasket 200, the lens assembly 300, and the printed circuit board 400. After removing the gasket 200, the gap between the printed circuit board 400 and the lens assembly 300 positioned on the pre-focusing module is the adhesive thickness. The position between them, pre-fixed by adhesive dispensing, allows for effective control of the adhesive thickness.

[0044] The support platform 700 is used to support the printed circuit board 400 and the lens assembly 300 connected by adhesive on the pre-focusing module. The clamping arm 600 can clamp and adjust the position and height of the lens assembly 300 on the support platform 700, so that the adjustment of the gap between the lens assembly 300 and the printed circuit board 400 is accurate and controllable, ensuring that the pre-focusing and AA focusing operations of the camera module can be effectively completed.

[0045] In this embodiment, the pre-focusing module includes a fixture base 100. The fixture base 100 is provided with a first positioning component for positioning the shim 200, a second positioning component for positioning the printed circuit board 400, and a fixing component for fixing the lens assembly 300. When the lens assembly 300 is fixed on the fixture base 100, the lens assembly 300 can press the shim 200 and the printed circuit board 400 onto the fixture base 100, thus stably fixing the positions of the shim 200, the printed circuit board 400, and the lens assembly 300, thereby achieving effective control of the adhesive layer thickness.

[0046] The tooling base 100 includes a base body 110, on which a receiving groove 111 is provided. The receiving groove 111 is used to receive the plug-in terminals on the printed circuit board 400. The printed circuit board 400 is attached to the surface of the base body 110. A second positioning component is disposed on the surface of the base body 110 to achieve positioning of the printed circuit board 400, thereby improving the positioning effect of the base body 110 on the printed circuit board 400, reducing the area occupied by the printed circuit board 400 during pre-focusing, facilitating the pre-focusing operation, and improving the efficiency of pre-focusing.

[0047] Optionally, the second positioning component includes at least two second positioning posts 113 disposed on the tooling base 100, and the printed circuit board 400 is provided with a second positioning hole 410 for the second positioning posts 113 to pass through. The structure is simple and easy to install the printed circuit board 400.

[0048] Preferably, the second positioning component includes two second positioning posts 113, which are arranged diagonally, thereby simplifying the structure of the second positioning component while achieving stable positioning of the printed circuit board 400.

[0049] Optionally, the first positioning component includes at least two first positioning posts 112 disposed on the tooling base 100, and the gasket 200 is provided with a first positioning hole 220 for the first positioning posts 112 to pass through. The structure is simple and easy to install the gasket 200.

[0050] Preferably, the first positioning component includes two first positioning posts 112, which are arranged opposite to each other, thereby simplifying the structure of the first positioning component while achieving stable positioning of the gasket 200.

[0051] In this embodiment, the fixing assembly includes two opposing base brackets 120. One end of each base bracket 120 is connected to the tooling base 100, and the other end of each base bracket 120 is provided with a positioning member for positioning the lens assembly 300 and a locking member for fixing the lens assembly 300. The positioning member, while achieving the positioning of the lens assembly 300, facilitates the locking member to lock the lens assembly 300 onto the base bracket 120.

[0052] The base bracket 120 is connected to the base body 110 of the tooling base 100. Two base brackets 120 are fixed to both sides of the base body 110, and both sides of the lens assembly 300 are locked to the two base brackets 120. This separate layout of the base body 110 and base brackets 120 reduces production costs and manufacturing difficulty. This layout adjusts the connection position between the lens mount 310 and the tooling base 100, facilitating adjustment of the gap between the lens assembly 300 and the printed circuit board 400, and allowing for intuitive visual observation by operators. This structure is simple and reliable, has low production costs, and occupies little space, ensuring the smooth completion of the camera module's pre-focusing operation.

[0053] Furthermore, the base bracket 120 is an L-shaped component. The vertical plate of the base bracket 120 is fixed to the side of the tooling base 100. The vertical plate of the base bracket 120 extends upward in the vertical direction, and the horizontal plates of the two base brackets 120 extend towards each other, with the horizontal plates of the base brackets 120 located in a horizontal plane. Positioning components and locking fasteners are set on the horizontal plates of the base bracket 120, and the lens mount 310 is connected to the horizontal plate of the base bracket 120. The above connection method is simple and reliable, occupies little space, and has low production costs, which helps to improve the manufacturing efficiency of the tooling base 100.

[0054] Specifically, the fixing assembly also includes a base locking member 130, which can pass through the third mounting hole 123 on the base bracket 120 and be screwed to the first mounting hole 114 on the side of the tooling base 100.

[0055] The fastener includes a second mounting hole 122 provided on the base bracket 120, and the lens locking member 500 can pass through the fourth mounting hole 311 on the lens mount 310 and be screwed to the second mounting hole 122 on the base bracket 120.

[0056] The positioning component includes a bracket positioning post 121 disposed on the base bracket 120, and a third positioning hole 312 provided on the lens mount 310, through which the bracket positioning post 121 can be positioned.

[0057] The structures of the aforementioned support platform 700 and clamping arm 600 are existing technologies and will not be described in detail here.

[0058] This embodiment also provides a pre-focusing-based AA adhesive thickness control method, applied to the aforementioned pre-focusing-based AA adhesive thickness control device. For example... Figure 5 As shown, the AA adhesive thickness control method based on pre-focusing provided in this embodiment mainly includes the following steps:

[0059] The printed circuit board 400, the gasket 200, and the lens assembly 300 are stacked and fixed from bottom to top.

[0060] Adjust the lens assembly 300 to the first clear position;

[0061] Remove the shim 200 and apply adhesive to the gap formed between the lens assembly 300 and the printed circuit board 400;

[0062] Adjust the lens assembly 300 to the second clear position.

[0063] Before AA focusing, pre-focusing is performed. A spacer 200 with the same thickness as the adhesive layer is pre-set, simulating the cured adhesive thickness. The spacer 200 is placed between the lens assembly 300 and the printed circuit board 400 before pre-focusing. At this point, the relative gap between the lens assembly 300 and the printed circuit board 400 to achieve a clear state can be determined, and the gap thickness is similar to the thickness of the spacer 200. After pre-focusing, AA focusing is performed to determine the relative position of the lens assembly 300 and the printed circuit board 400. This allows for precise control of the adhesive layer thickness, spacer 200 thickness, and relative gap, ultimately achieving effective control over the cured adhesive thickness. This effectively reduces errors caused by adhesive curing and improves the image quality, reliability, and adhesion of the manufactured camera module. By improving the process by adding a pre-focusing step before AA focusing, effective control of the cured adhesive thickness is achieved. This method is simple, convenient, and easy to use, effectively improving the operational efficiency and first-pass yield of AA focusing.

[0064] Furthermore, this embodiment provides an AA adhesive thickness control method based on pre-focusing, including the following steps:

[0065] Step 1: Stack and fix the printed circuit board 400, gasket 200 and lens assembly 300 from top to bottom.

[0066] Specifically, the spacer 200 is placed on top of the printed circuit board 400, which has a photosensitive chip 420 facing the lens assembly 300. The photosensitive chip 420 on the printed circuit board 400 passes through the clearance hole 210 on the spacer 200.

[0067] Place the lens assembly 300 on the spacer 200, with the spacer 200 positioned between the printed circuit board 400 and the lens assembly 300, so that the lens assembly 300 and the photosensitive chip 420 are directly opposite each other.

[0068] In actual operation, the printed circuit board 400, the gasket 200 and the lens assembly 300 are respectively placed on the tooling base 100 and positioned and fixed accordingly.

[0069] By using the tooling base 100 to position and fix the connecting pad 200, lens assembly 300 and printed circuit board 400, the camera module and the pre-focusing module can be tightly fitted. This helps to fix the lens assembly 300 after focusing it to the best clear position. By fixing the relative position of the lens body 320 and the lens mount 310, the physical height of the lens assembly 300 is determined, thereby controlling the relative position of the lens assembly 300 and the photosensitive chip 420 to achieve the clearest state.

[0070] Step 2: Adjust the lens assembly 300 to the first clear position.

[0071] Specifically, the relative positions of the lens body 320 and the lens mount 310 of the lens assembly 300 are adjusted to bring the lens assembly 300 to the optimal clear position. In this embodiment, the operator adjusts the relative positions of the lens body 320 and the lens mount 310 by manually rotating the lens body 320. After finding the first clear position through AA focusing, the flatness of the lens assembly 300 also needs to be adjusted to ensure that the camera module achieves the clearest overall state.

[0072] Optionally, once the lens assembly 300 is adjusted to the optimal clear position, the relative positions of the lens body 320 and the lens mount 310 are fixed by adhesive bonding.

[0073] The adhesive used for bonding is UV adhesive, which has the advantages of being energy-saving, environmentally friendly, economical and efficient, and can effectively fix the relative position of the lens body 320 and the lens mount 310.

[0074] In this embodiment, adjusting the relative position of the lens body 320 and the lens mount 310 includes the following detailed steps: placing an image detector directly above the lens body 320 to determine the position of the lens body 320; adjusting the relative position of the lens body 320 and the lens mount 310 to determine whether the lens body 320 has reached a sharp state; if not, readjusting the relative position of the lens body 320 and the lens mount 310. The image detector can display the sharpness status of the camera module during the focusing process in real time, helping operators to determine whether a sharp state has been achieved. The above process improvement enhances the accuracy of pre-focusing, reduces the positional deviation between the lens body 320 and the lens mount 310, thereby effectively improving the image quality, reliability, and adhesion of the camera module, and increasing the yield rate of the finished camera module.

[0075] Step 3: Remove the gasket 200 and apply adhesive to the gap formed between the lens assembly 300 and the printed circuit board 400.

[0076] Specifically, after initially adjusting the focal length of the lens assembly 300, the shim 200 is removed, forming a gap between the lens assembly 300 and the printed circuit board 400. Adhesive is applied to the gap to connect the lens assembly 300 and the printed circuit board 400, and the thickness of the gap is the thickness of the adhesive layer.

[0077] In this embodiment, the adhesive is cured by high-temperature thermosetting. In other embodiments of this embodiment, the curing method is light curing.

[0078] For example, when applying adhesive to the lens mount 310, the adhesive is applied around the bottom edge of the lens mount 310; when applying adhesive to the printed circuit board 400, the adhesive is applied around the top edge of the printed circuit board 400 near the photosensitive chip 420.

[0079] The adhesive used is AA glue, which can effectively fix the relative position of the lens mount 310 and the printed circuit board 400.

[0080] Step 4: Adjust the lens assembly 300 to the second clear position.

[0081] Specifically, the pre-connected printed circuit board 400 and lens assembly 300 are mounted on the support stage 700, and the lens assembly 300 is held by the clamping arm 600 so that the lens assembly 300 is aligned with the photosensitive chip 420.

[0082] The clamping arm 600 can adjust the distance between the lens assembly 300 and the printed circuit board 400, so that the height of the lens assembly 300 is adjusted to the optimal preset position, that is, the lens assembly 300 is adjusted to the second clear position, and the lens body 320 achieves a state of center sharpness.

[0083] Step 5: Apply high-temperature thermosetting adhesive.

[0084] Specifically, by subjecting the dispensing adhesive to ultraviolet light curing and high-temperature heat curing, the relative position of the lens assembly 300 and the printed circuit board 400 is determined, and a dispensing adhesive layer is formed in the gap between the lens assembly 300 and the printed circuit board 400.

[0085] In this embodiment, the tolerance of the gasket 200 is less than or equal to 0.01 mm. The smaller tolerance of the gasket 200 improves the reliability of the gasket 200 in simulating the curing thickness of the adhesive, which helps to reduce the errors generated in the implementation of the AA adhesive thickness control method based on pre-focusing, thereby improving the first-pass yield of the camera module finished product.

[0086] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A method for controlling AA adhesive thickness based on pre-focusing, characterized in that, The method includes: The printed circuit board (400), the gasket (200) and the lens assembly (300) are stacked and fixed from bottom to top. Adjust the lens assembly (300) to the first clear position; Remove the gasket (200) and apply adhesive to the gap formed between the lens assembly (300) and the printed circuit board (400); Adjust the lens assembly (300) to the second clear position; Adjusting the lens assembly (300) to the first clear position includes: Adjust the relative positions of the lens mount (310) and the lens body (320) of the lens assembly (300) to adjust the lens assembly (300) to the first clear position; Adjusting the lens assembly (300) to the second clear position includes: Adjust the distance between the lens assembly (300) and the printed circuit board (400) so that the height of the lens assembly (300) is adjusted to the optimal preset position, that is, adjust the lens assembly (300) to the second clear position; After adjusting the lens assembly (300) to the first clear position, the following is also included: The lens body (320) is attached to the lens mount (310).

2. The AA adhesive thickness control method based on pre-focusing according to claim 1, characterized in that, Adjusting the relative position of the lens body (320) and the lens mount (310) includes: An image detector is disposed above the lens body (320); The relative position of the lens body (320) and the lens mount (310) is adjusted according to the image acquired by the image detector.

3. The AA adhesive thickness control method based on pre-focusing according to claim 1, characterized in that, After adjusting the lens assembly (300) to the second clear position, the following is also included: A high-temperature thermosetting adhesive is used to form an adhesive layer in the gap between the lens assembly (300) and the printed circuit board (400).

4. The AA adhesive thickness control method based on pre-focusing according to claim 1, characterized in that, The printed circuit board (400) is provided with a photosensitive chip (420), which is positioned opposite the lens assembly (300).

5. A pre-focused AA adhesive thickness control fixture, applicable to the pre-focused AA adhesive thickness control method according to any one of claims 1-4, characterized in that, The AA adhesive thickness control fixture based on pre-focusing includes: A pre-focusing module is used to support and fix the printed circuit board (400), the gasket (200), and the lens assembly (300); the gasket (200) is disposed between the lens assembly (300) and the printed circuit board (400). By pre-setting the gasket (200) to have the same thickness as the adhesive layer formed by the dispensing adhesive, the gasket (200) can simulate the curing thickness of the dispensing adhesive. A support platform (700) is used to support the printed circuit board (400) and the lens assembly (300) that are glued to the pre-focusing module. A clamping arm (600) is provided, which can clamp and adjust the position and height of the lens assembly (300) on the support platform (700).

6. The AA adhesive thickness control fixture based on pre-focusing according to claim 5, characterized in that, The pre-focusing module includes a fixture base (100), on which a first positioning component for positioning the gasket (200), a second positioning component for positioning the printed circuit board (400), and a fixing component for fixing the lens assembly (300) are provided. The lens assembly (300) is fixed on the fixture base (100), and the lens assembly (300) can press the gasket (200) and the printed circuit board (400) onto the fixture base (100).

7. The AA adhesive thickness control fixture based on pre-focusing according to claim 6, characterized in that, The first positioning component includes at least two first positioning posts (112) disposed on the tooling base (100), and the gasket (200) is provided with a first positioning hole (220) through which the first positioning posts (112) pass; and / or The second positioning component includes at least two second positioning posts (113) disposed on the tooling base (100), and the printed circuit board (400) is provided with a second positioning hole (410) through which the second positioning posts (113) pass.

8. The AA adhesive thickness control fixture based on pre-focusing according to claim 7, characterized in that, The fixing assembly includes two opposing base brackets (120), one end of which is connected to the tooling base (100), and the other end of which is provided with a positioning element for positioning the lens assembly (300) and a locking element for fixing the lens assembly (300).

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