An image sensor circuit board fixing structure

Abstract

This utility model discloses an image sensor circuit board fixing structure, including a bracket and an image sensor circuit board disposed on the top of the bracket. The bracket is provided with a heightening screw post, and the image sensor circuit board is provided with a fixing hole corresponding to the heightening screw post. The top of the heightening screw post extends upward to form a fixing hole and has an internal threaded hole, and an upper screw is screwed into the internal threaded hole. A horizontal gap is provided between the heightening screw post and the inner wall of the fixing hole, and a vertical gap is provided between the image sensor circuit board and the nut of the upper screw. The above design solves the technical problem that the unevenness of existing brackets or protective shells and the tightening of screws can cause deformation of the image sensor circuit board, affecting the image clarity.

Description

Technical Field

[0001] This utility model relates to the field of sensor circuit board fixing, specifically to an image sensor circuit board fixing structure. Background Technology

[0002] In the field of video surveillance, image sensor circuit boards are fixed to a protective housing or bracket as a whole by screws. After the image sensor circuit board is fixed by screws, the unevenness of the bracket or protective housing and the tightening of the screws will cause slight deformation of the image sensor circuit board. This deformation has a direct impact on the image clarity of the image sensor. The higher the resolution of the image sensor, the greater the impact of the deformation of the image sensor circuit board on the clarity.

[0003] In addition, while the image sensor circuit board is fixed to the bracket or protective housing as a whole, the protective housing still needs to position the lens using silicone rings or other methods to ensure the airtightness and appearance of the product. Due to the existence of cumulative errors, there will be differences in the positioning of the image sensor circuit board and the lens. This will cause over-positioning of the image sensor circuit board and the lens. Over-positioning will further aggravate the deformation of the circuit board and reduce the clarity of the image sensor.

[0004] In existing technologies, to achieve ideal sharpness after assembly, it's necessary to raise the focusing sharpness standard beforehand to ensure consistent sharpness after assembly. This approach increases production costs, such as labor. Even with higher focusing standards, the uncertainty of circuit board deformation increases the proportion of defective images, resulting in low first-pass yield. As image sensor resolution increases, circuit board deformation has a greater impact on the image sensor, further reducing the focusing first-pass yield of existing technologies. Therefore, once a certain resolution is achieved, higher-precision focusing solutions, such as active focusing technology, must be adopted to ensure optimal image sensor imaging performance.

[0005] To address this issue, our company provides an image sensor circuit board mounting structure. Utility Model Content

[0006] The purpose of this invention is to overcome the defects in the prior art and provide a fixing structure for an image sensor circuit board.

[0007] To achieve the above objectives, this utility model adopts the following technical solution:

[0008] An image sensor circuit board fixing structure includes a bracket and an image sensor circuit board disposed on the top of the bracket. The bracket is provided with a heightening screw post, and the image sensor circuit board is provided with a fixing hole corresponding to the heightening screw post. The top of the heightening screw post extends upward to the fixing hole and has an internal threaded hole, and a top screw is screwed into the internal threaded hole.

[0009] A horizontal gap is provided between the heightening screw post and the inner wall of the fixing hole, and a vertical gap is provided between the image sensor circuit board and the nut of the upper screw.

[0010] Preferably, the vertical gap is 0.28mm-0.32mm.

[0011] Preferably, the horizontal gap is 0.18mm-0.22mm.

[0012] Preferably, a positioning post is provided on one side of the heightening screw post, and the image sensor circuit board is provided with a positioning hole corresponding to the positioning post. The positioning post exists in the positioning hole, and the positioning hole is connected to the fixing hole.

[0013] Preferably, the bracket is provided with a plurality of mounting holes for mounting with the protective housing.

[0014] Preferably, the screws are self-tapping screws.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] This technical solution employs a suspended circuit board design. Vertically, a certain vertical gap is designed between the screws and the image sensor circuit board to reduce over-positioning of the circuit board and lens, thus minimizing the impact of overall assembly on image sharpness. Horizontally, an appropriate horizontal gap is maintained to prevent over-positioning after assembly. These structures ensure accurate relative positioning between the circuit board and the protective housing while allowing for slight displacement, thereby avoiding over-positioning due to assembly errors. For 8-megapixel resolution lens products, this technical solution can improve the first-pass yield by 20%. Attached Figure Description

[0017] Figure 1 This is a longitudinal sectional view of the present invention;

[0018] Figure 2 This is an enlarged view of section A of this utility model;

[0019] Figure 3 This is a cross-sectional view of the present invention;

[0020] Figure 4 This is an enlarged view of section B of the present invention;

[0021] Figure 5This is an assembly diagram of the lens and this utility model.

[0022] In the diagram: 1. Bracket; 11. Heightening screw post; 12. Internal threaded hole; 13. Top screw; 14. Positioning post; 15. Mounting hole; 2. Image sensor circuit board; 21. Fixing hole; 22. Positioning hole; 3. Horizontal gap; 4. Vertical gap; 100. Lens; 101. Protective housing; 102. Silicone ring. Detailed Implementation

[0023] A preferred embodiment of the present invention will now be described in conjunction with the accompanying drawings, providing a clear and complete description of the technical solution in this preferred embodiment.

[0024] An image sensor circuit board fixing structure includes a bracket 1 and an image sensor circuit board 2 disposed on the top of the bracket 1. The bracket 1 is provided with a heightening screw post 11, and the image sensor circuit board 2 is provided with a fixing hole 21 corresponding to the heightening screw post 11. The top of the heightening screw post 11 extends upward to the fixing hole 21 and has an internal threaded hole 12. An upper screw 13 is screwed into the internal threaded hole 12.

[0025] A horizontal gap 3 is provided between the heightening screw post 11 and the inner wall of the fixing hole 21, and a vertical gap 4 is provided between the image sensor circuit board 2 and the nut of the upper screw 13.

[0026] This technical solution adopts a floating design for the image sensor circuit board 2, which reduces over-positioning of the image sensor circuit board 2 and the lens 100, thereby reducing the impact of overall assembly on image clarity. At the same time, this solution can also delay the need for higher precision focusing technology for high-resolution image sensors, thereby reducing the production difficulty and cost in the field of surveillance cameras.

[0027] Specifically, such as Figure 2 As shown, in the vertical direction, a certain vertical gap 4 is designed between the upper screw 13 and the image sensor circuit board 2 to ensure that the upper screw 13 will not press against the image sensor circuit board 2 during assembly, and also to ensure that the upper screw 13 can limit the vertical movement of the image sensor circuit board 2. Specifically, a raised screw post structure is adopted, the height of which can fully ensure that after the upper screw 13 is tightened, a certain gap is maintained between the nut and the image sensor circuit board 2. This can effectively prevent the upper screw 13 from putting pressure on the image sensor circuit board 2 and prevent the image sensor circuit board 2 from deforming due to force. In the horizontal direction, a suitable horizontal gap 3 is maintained in the design to prevent over-positioning of the product after assembly. These structures ensure the accurate relative position of the image sensor circuit board 2 and the protective housing 101 while allowing a certain amount of slight displacement, thereby avoiding over-positioning caused by assembly errors.

[0028] In addition, this solution reduces reliance on assembly precision and complex processes. By optimizing gap dimensions and assembly processes, it improves assembly efficiency and product quality consistency, reduces scrap and rework rates during production, thereby lowering the production difficulty and cost in the surveillance camera field.

[0029] Specifically, the vertical gap 4 is 0.28mm-0.32mm.

[0030] Specifically, the horizontal gap 3 is 0.18mm-0.22mm.

[0031] The optimal vertical gap 4 in this technical solution is 0.3mm. The vertical gap 4 has been verified multiple times. In order to better fix the image sensor circuit board 2 and prevent over-positioning, the smaller the vertical gap 4, the better. However, when the vertical gap 4 is too small, such as 0.2mm, due to factors such as the fastening of the screw 13 and errors, it is not possible to guarantee that the image sensor circuit board 2 can move freely in the horizontal direction. If the vertical gap 4 is too large, it will result in an excessively large fixing gap for the image sensor circuit board 2, which is not conducive to the control of assembly and assembly processes.

[0032] Specifically, a positioning post 14 is provided on one side of the heightening screw post 11, and the image sensor circuit board 2 is provided with a positioning hole 22 corresponding to the positioning post 14. The positioning post 14 exists in the positioning hole 22, and the positioning hole 22 is connected to the fixing hole 21.

[0033] Specifically, the bracket 1 is provided with a plurality of mounting holes 15 for mounting with the protective housing.

[0034] The bracket 1 of this technical solution is also connected to the protective shell 101. One side of the lens 100 is locked to the image sensor circuit board 2, and the other side is snapped to the protective shell 101. A silicone ring 102 is provided at the connection between the protective shell 101 and the lens 100.

[0035] Specifically, screw 13 is a self-tapping screw.

[0036] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An image sensor circuit board fixing structure comprising a bracket (1) and an image sensor circuit board (2) provided on the top of the bracket (1), characterized in that: The bracket (1) is provided with a heightening screw post (11), and the image sensor circuit board (2) is provided with a fixing hole (21) corresponding to the heightening screw post (11). The top of the heightening screw post (11) extends upward to the fixing hole (21) and has an internal thread hole (12). The internal thread hole (12) is screwed with an upper screw (13). A horizontal gap (3) is provided between the heightening screw post (11) and the inner wall of the fixing hole (21), and a vertical gap (4) is provided between the image sensor circuit board (2) and the nut of the upper screw (13).

2. The image sensor circuit board fixing structure according to claim 1, characterized in that: The vertical gap (4) is 0.28mm-0.32mm.

3. The image sensor circuit board fixing structure according to claim 1, characterized by: The horizontal gap (3) is 0.18mm-0.22mm.

4. The image sensor circuit board fixing structure according to claim 1, characterized by: The heightening screw post (11) has a positioning post (14) on one side, and the image sensor circuit board (2) has a positioning hole (22) corresponding to the positioning post (14). The positioning post (14) exists in the positioning hole (22), and the positioning hole (22) is connected to the fixing hole (21).

5. The image sensor circuit board fixing structure according to claim 1, characterized by: The bracket (1) is provided with a plurality of mounting holes (15) for mounting with the protective housing.

6. The image sensor circuit board fixing structure according to claim 5, characterized by: The upper screw (13) is a self-tapping screw.

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