Vehicle-mounted camera module front shell structure, camera module shell structure and vehicle

Abstract

The utility model discloses vehicle camera module front shell structure, camera module shell structure and vehicle, including front shell, PCB board, and front shell and PCB board detachable fixed and can enclose and form a closed cavity structure, and the through -hole that at least one can make cavity and cavity outer space intercommunication is seted up to the front shell circumference. In the utility model, through the escape gap of through -hole formation, when the gas in the cavity expands due to the high temperature of PCB board, can release through the through -hole, guarantee the pressure of inside and outside cavity consistent, thereby play the role of pressure balance, release the stress that produces due to thermal expansion and cold shrink, thereby improve the camera out of focus or out of focus problem that the deformation of PCB board leads to, promote the imaging stability and reliability of camera under different temperature environment.

Description

Technical Field

[0001] This utility model relates to the field of camera technology, and more specifically to the front shell structure of an in-vehicle camera module, the camera module housing structure, and a vehicle. Background Technology

[0002] This solution addresses the requirements of car manufacturers for compact and miniaturized automotive camera modules, necessitating the design of modules that meet these requirements within a relatively compact space.

[0003] Current automotive camera module structures typically consist of three main parts: a front housing, a PCB, and a rear housing. After assembly, an air cavity is formed between the front housing and the PCB, or between the rear housing and the PCB. Due to the requirements of compact and miniaturized design, the relative position between the PCB and the front housing needs to be designed with extreme compression.

[0004] During camera operation, components on the PCB generate heat due to their own power consumption and changes in ambient temperature. Because the cavity between the front housing and the PCB is typically relatively enclosed, heat dissipation is difficult, causing the temperature inside the cavity to rise continuously. As the temperature rises, various materials inside the camera, such as metals, plastics, and electronic components, undergo dimensional changes due to their thermal expansion and contraction properties. The PCB, as a key component supporting numerous electronic components, has significantly different coefficients of thermal expansion, making it susceptible to thermal expansion and contraction. When the PCB expands due to heat, its expansion is restricted because it is fixed within the camera's internal structure, thus generating stress within the PCB.

[0005] For camera imaging, the relative positional accuracy between the lens assembly on the front housing and the image sensor assembly on the PCB is crucial. If the PCB experiences stress and deformation due to thermal expansion and contraction, the image sensor mounted on the PCB will shift. This change in image sensor position directly disrupts the originally precise optical imaging relationship between the lens and the image sensor, leading to defocusing of the camera, blurry images, and a significant reduction in image quality. Utility Model Content

[0006] The technical problem to be solved by this utility model is how to avoid the camera module from defocusing or losing focus due to thermal expansion.

[0007] This utility model solves the above-mentioned technical problems through the following technical means: a front shell structure for a vehicle camera module, including a front shell and a PCB board. The front shell and the PCB board are detachable and fixed and can be enclosed to form a sealed cavity structure. The front shell has at least one through hole in the circumferential direction that allows the cavity to communicate with the external space of the cavity.

[0008] As a preferred technical solution, at least one through hole is provided on the circumferential edge of the PCB board.

[0009] As a preferred technical solution, the through holes are arranged in pairs, with each pair of through holes located on two opposite sides of the front shell in the circumferential direction, and each pair of through holes forming a convection channel that penetrates the cavity.

[0010] As a preferred technical solution, the edge of the front shell facing the PCB board is provided with a groove, and after the PCB board and the front shell are enclosed and fixed, the groove forms a through hole that communicates with the cavity.

[0011] As a preferred technical solution, the groove is located in the middle of the front shell edge.

[0012] As a preferred technical solution, at least one positioning post is provided at the end of the front shell that is connected to the PCB board, and the front shell is fastened to the PCB board by screws.

[0013] As a preferred technical solution, the PCB board has positioning holes adapted to the positioning posts, and the PCB board has screw holes adapted to the screws.

[0014] As a preferred technical solution, a lens is also included, which is glued and fixed to the end of the front shell away from the PCB board.

[0015] This utility model also provides a camera module housing structure, including a front housing structure of a vehicle camera module, a rear housing, and a connector. The rear housing is fixedly connected to the front housing and surrounds it to form another cavity covering the PCB board. The connector is fixedly connected to the end of the rear housing away from the front housing by screws.

[0016] This utility model also provides a vehicle, including the above-mentioned camera module housing structure or vehicle-mounted camera module front housing structure.

[0017] The beneficial effects of this utility model are as follows: (1) In this utility model, an air escape gap is formed by the through hole. When the gas in the cavity expands due to the high temperature of the PCB board, it can be released through the through hole to ensure that the pressure inside and outside the cavity is consistent, thereby playing the role of pressure balance; releasing the stress caused by thermal expansion and contraction, thereby improving the problem of camera defocusing or loss of focus caused by PCB board deformation, and improving the imaging stability and reliability of the camera under different temperature environments.

[0018] (2) In this utility model, the setting of two positioning posts can play a foolproof role and facilitate the positioning and connection of the PCB board and the front shell. Attached Figure Description

[0019] Figure 1 This is an exploded view of the front shell structure of the vehicle-mounted camera module provided in Embodiment 1 of this utility model; Figure 2This is a schematic diagram of the bottom structure of the front shell provided in Embodiment 1 of this utility model; Figure 3 This is a schematic diagram of the front shell and PCB board mounting structure provided in Embodiment 1 of this utility model; Figure 4 This is an exploded view of the camera module housing structure provided in Embodiment 2 of this utility model; Figure 5 This is a schematic diagram of the camera module housing structure provided in Embodiment 2 of this utility model; Figure 6 This is a schematic diagram of the analytical force data structure without through holes provided in Embodiment 1 of this utility model; Figure 7 This is a schematic diagram of the analytical force data structure for opening a through hole provided in Embodiment 1 of this utility model; Reference numerals: 1. Lens; 101. Through hole one; 102. Through hole two; 103. Through hole three; 104. Through hole four; 2. Curing adhesive; 201. Screw hole one; 202. Screw hole two; 203. Screw hole three; 204. Screw hole four; 3. Front shell; 301. Positioning post one; 302. Positioning post two; 4. PCB board; 5. Screw one; 6. Rear shell; 7. Connector; 8. Screw two. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below in conjunction with the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] Example 1 See Figure 1 The front shell structure of the vehicle-mounted camera module includes a lens 1, a front shell 3, and a PCB board 4. The lens 1 is bonded and fixed to the front shell 3. In this embodiment, the lens 1 is bonded and fixed by a curing adhesive 2. The curing adhesive 2 is applied to the connecting surface between the lens 1 and the front shell 3. The front shell 3 and the PCB board 4 are detachably fixed and can form a sealed cavity structure. The front shell 3 has at least one through hole in its circumference, which connects the cavity to the outside. The through hole forms an air escape gap. When the high temperature of the PCB board causes the gas in the cavity between the front shell 3 and the PCB board 4 to expand, it can be released through the through hole to ensure that the pressure inside and outside the cavity is consistent, thereby playing a role in pressure balance; releasing the stress caused by thermal expansion and contraction, thereby improving the problem of camera defocusing or loss of focus caused by PCB board deformation, and improving the imaging stability and reliability of the camera under different temperature environments.

[0022] It should be noted that the front shell structure of the vehicle camera module in this embodiment is assembled in a cleanroom. After the front shell structure of the vehicle camera module is assembled, it will be sealed. Therefore, in actual use, the outside of the cavity is in a closed cleanroom environment, so dust will not enter the cavity through the through hole and interfere with the PCB board 4.

[0023] See Figure 6 , Figure 7 A structural improvement was found by comparing the resolution data of camera modules 0-1 without through holes with the resolution data of camera modules 1-1 with through holes. The overall resolution data was improved (the minimum value of each column of data for 0-1 is less than the minimum value of each column of data for 1-1, indicating that there is data improvement), and this has a direct impact on the image review results of end customers.

[0024] See Figure 2 In order to better release the stress caused by thermal expansion and contraction and improve the efficiency of pressure balance, in this embodiment, grooves are provided on the four edges of the bottom of the front shell 3. After the front shell 3 is fixed to the PCB board 4, the four grooves form four through holes, namely through hole one 101, through hole two 102, through hole three 103, and through hole four 104. The bottom of the front shell 3 is a quadrilateral structure. Through hole one 101 and through hole four 104 are located on two opposite sides of the bottom of the front shell 3, and through hole two 102 and through hole three 103 are located on the other two opposite sides of the bottom of the front shell 3, thereby forming two convection channels that penetrate the cavity.

[0025] See Figure 2 The bottom of the front shell 3 can be a square or rectangular structure, or it can be a circular or other polygonal structure such as a hexagonal structure. When the bottom of the front shell 3 is a circular structure, the number of convection channels can be increased appropriately. The through holes are set in pairs. Alternatively, multiple grooves with equal or unequal angles can be set around the front shell 3. When the bottom of the front shell 3 is a hexagonal structure, three convection channels that penetrate the cavity can be formed by adding grooves on the opposite surfaces of the hexagonal structure.

[0026] See Figure 1 , Figure 2 In this embodiment, the grooves are all located in the middle of the corresponding surface of the front shell 3 and are close to the PCB board 4. Of course, they can also be located in the middle of the corresponding surface of the front shell 3, or on the side of the front shell 3 that is connected to the cavity but not close to the PCB board 4. Multiple grooves can also be provided on each surface of the front shell 3. The shape of the grooves can be rectangular, square, circular or other irregular shapes. In this embodiment, a rectangle is used as an example.

[0027] See Figure 1 , Figure 2To facilitate positioning of the PCB board 4 and the front shell 3 during installation, two positioning posts are provided at the end of the front shell 3 connected to the PCB board 4, namely positioning post one 301 and positioning post two 302. Positioning post one 301 and positioning post two 302 are used for positioning and error prevention. In this embodiment, positioning post one 301 and positioning post two 302 are located at opposite corners of the end of the front shell 3, but they can also be located at different corners. Correspondingly, the PCB board 4 is provided with two positioning holes that are adapted to positioning post one 301 and positioning post two 302. The positioning holes can be through holes or non-through holes. The PCB board 4 and the front shell 3 are connected and fastened by screw 5. Four screw holes are provided on the four corners of the front shell 3. The screw holes are screw hole 1 201, screw hole 202, screw hole 3 203 and screw hole 4 204. In order to further improve the efficiency of pressure balance, at least one through hole can also be provided in the circumference of the PCB board 4. In this embodiment, four through holes are used as an example.

[0028] Example 2 See Figure 4 , Figure 5 The difference between this embodiment and embodiment 1 is that it provides a camera module housing structure including the front housing structure of the vehicle camera module in embodiment 1, and also includes a rear housing 6, a connector 7, and a second screw 8. The rear housing 6 is fixedly connected to the front housing 3 and surrounds it to form another cavity covering the PCB board 4. In this embodiment, welding is used as an example of fixing, but it can also be fixed by bonding or threading. The connector 7 is fixedly connected to the end of the rear housing 6 away from the front housing 3, and the connector 7 is connected and fastened to the rear housing 6 by the second screw 8.

[0029] Example 3 The difference between this embodiment and Embodiment 1 or Embodiment 2 is that it provides a vehicle including the vehicle-mounted camera module front shell structure in Embodiment 1 or the camera module housing structure in Embodiment 2.

[0030] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model 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 of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A front housing structure for an in-vehicle camera module, characterized in that, It includes a front shell and a PCB board. The front shell and the PCB board are detachable and fixed and can be enclosed to form a sealed cavity structure. The front shell has at least one through hole in the circumferential direction that allows the cavity to communicate with the external space of the cavity.

2. The front shell structure of the vehicle-mounted camera module according to claim 1, characterized in that, At least one through hole is provided on the circumferential edge of the PCB board.

3. The front shell structure of the vehicle-mounted camera module according to claim 1, characterized in that, The through holes are arranged in pairs, with each pair of through holes located on two opposite sides of the front shell in the circumferential direction. Each pair of through holes forms a convection channel that penetrates the cavity.

4. The front shell structure of the vehicle-mounted camera module according to claim 1, characterized in that, The edge of the front shell facing the PCB board has a groove. After the PCB board and the front shell are enclosed and fixed, the groove forms a through hole that communicates with the cavity.

5. The front shell structure of the vehicle-mounted camera module according to claim 4, characterized in that, The groove is located in the middle of the front shell edge.

6. The front shell structure of the vehicle-mounted camera module according to claim 1, characterized in that, The front cover is provided with at least one positioning post at the end connected to the PCB board, and the front cover is fastened to the PCB board by screws.

7. The front shell structure of the vehicle-mounted camera module according to claim 6, characterized in that, The PCB board has positioning holes that match the positioning posts, and screw holes that match the screws.

8. The front shell structure of the vehicle-mounted camera module according to claim 1, characterized in that, It also includes a lens, which is glued and fixed to the end of the front cover away from the PCB board.

9. A camera module housing structure, characterized in that, The vehicle camera module includes a front shell structure, a rear shell, and a connector as described in any one of claims 1-8. The rear shell is fixedly connected to the front shell and forms another cavity covering the PCB board. The connector is fixedly connected to the end of the rear shell away from the front shell by screws.

10. A vehicle, characterized in that, Includes the camera module housing structure as described in claim 9.

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