A vehicle-mounted camera module

Abstract

The utility model relates to vehicle camera module technical field especially a kind of vehicle camera module, front cover and rear cover are formed after splicing installation space;First layer PCBA board is installed in front cover, and the front end surface of first layer PCBA board is pasted with photosensitive chip, and optical lens optical axis center and photosensitive chip optical axis center coincide and keep effective focal length EFL, and the rear end surface of first layer PCBA board is installed with floating connector male head;The front end of second layer PCBA board is installed with the female head of floating connector matched with floating connector male head, and realizes floating connector soft connection;One end of FAKRA connector is connected with second layer PCBA board, and the other end of FAKRA connector is connected with external connector power connection. Two layer PCBA board is flexibly connected using floating connector, first layer PCBA board is fixed with front cover, then second layer PCBA board is connected with first layer PCBA board, finally in second layer PCBA board and rear cover side wall point gum fixed, effectively offset tolerance accumulation by floating connecting piece, guarantee each device connection accuracy.

Description

Technical Field

[0001] This utility model relates to the field of vehicle camera module technology, and in particular to a vehicle camera module. Background Technology

[0002] With the rapid development of autonomous driving, Advanced Driver Assistance Systems (ADAS) are becoming increasingly important, reducing driver fatigue and improving driving safety to a certain extent. Camera modules, acting as the eyes of the car, are an indispensable part of ADAS, and their installation volume has increased from a single unit to more than ten, while the structure of camera modules has evolved from monocular to multi-lens. Due to adverse factors such as high and low temperatures, bumps and vibrations, salt spray, and water vapor in the vehicle operating environment, camera modules require high reliability.

[0003] In the existing technology, on the one hand, most of the bonding areas between the lens and the camera front cover are directly bonded to the glue without any treatment. Due to the high-frequency vibration, wind and rain, high and low temperature environment in vehicle use, and the glue being exposed to the external environment, the glue is very likely to fail, causing the lens to fall off, which seriously affects normal use and driving safety.

[0004] On the other hand, as the requirements for intelligent camera design become increasingly demanding, single-layer PCBA boards are no longer sufficient for the placement of electronic components, leading to the introduction of double-layer PCBA boards. Most manufacturers use screws to fix the two PCBA boards to the front cover (hereinafter referred to as the front cover) and rear cover (hereinafter referred to as the rear cover) of the camera during assembly, achieving a double-layer board connection by connecting the front and rear covers. Some manufacturers even connect both PCBA boards to the front cover. Due to manufacturing and assembly tolerances, this can cause the connectors on the second-layer PCBA board to shift off-center from the through-holes in the rear cover, preventing the Fakra connector from assembling with the board-end connector. It can also cause uneven stress on the sealing ring between the front and rear covers, affecting waterproofing. Furthermore, directly screwing the first-layer PCBA board (containing a sensor, a semiconductor device that converts light signals into electrical signals) onto the front cover can cause significant sensor eccentricity or rotation, resulting in low lens anti-aliasing (AA) efficiency or AA failure. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a vehicle-mounted camera module in order to solve the problems existing in the prior art mentioned above.

[0006] The technical solution adopted by this utility model to solve its technical problem is: a vehicle-mounted camera module, comprising...

[0007] Optical lens,

[0008] The housing consists of a front cover and a rear cover, which are assembled to form an installation space.

[0009] The first PCBA board has a photosensitive chip that converts light signals into electrical signals attached to its front end. The first PCBA board is installed inside the front cover, and the optical lens is installed on the front cover. The optical axis center of the optical lens is aligned with the optical axis center of the photosensitive chip to maintain the effective focal length (EFL). The photosensitive chip is attached to the front end of the first PCBA board, and a floating connector male is installed on the rear end of the first PCBA board.

[0010] The second PCBA board has a floating connector female head that mates with the male head of the floating connector at its front end, enabling a soft connection of the floating connector. The second PCBA board is mounted on the back cover.

[0011] The FAKRA connector is an external power supply and signal transmission interface. One end of the FAKRA connector connects to the second-layer PCBA board, and the other end of the FAKRA connector is connected to an external connector for power supply.

[0012] Furthermore, an anti-fooling rib is provided on one inner side wall of the front cover, one end of the front cover is open, and a first through hole is provided on the end face of the other end of the front cover. A step is provided along the edge of the first through hole, and a second mounting hole is symmetrically provided on the step. Each of the four corners of the inner end face of the front cover is provided with a support boss for supporting the first layer of PCBA board, and a positioning post is provided on the support boss.

[0013] Furthermore, the outer end face of the front cover is provided with an annular protrusion for supporting the optical lens, and the outer circumferential wall of the annular protrusion is provided with symmetrically arranged limiting protrusions. The top surface of the annular protrusion is the bonding area of ​​the annular protrusion.

[0014] The optical lens has a flange bonding area that matches the bonding area of ​​the annular boss.

[0015] Furthermore, the contact surface of the support boss is a conductive surface. Both ends of the first PCBA board are provided with bare copper areas, which are connected to the grounding terminal of the first PCBA board. A grounding hole is provided on the grounding terminal of the first PCBA board to provide a grounding wire for connection to the grounding terminal of the first PCBA board. The grounding terminal of the first PCBA board contacts the conductive surface of the support boss and is installed by the second screw.

[0016] Furthermore, a first mounting hole is provided on each of the two symmetrically arranged corners on the outer side of the front cover. The front cover and the rear cover are connected by a first screw passing through the first mounting hole. A limit groove is provided at the lower end of the other corner on the outer side of the front cover.

[0017] Furthermore, a foolproof notch is installed on one side edge of the first layer PCBA board to match the foolproof rib in the front cover, and a positioning hole is opened on the surface of the first layer PCBA board to match the positioning post in the front cover.

[0018] Furthermore, a gap for heat dissipation is provided between the four perimeters of the first PCBA board and the inner wall of the front cover, with a gap distance of 0.8 to 2 mm, and the effective focal length (EFL) between the optical lens and the photosensitive chip is 0.95 ± 0.05 mm.

[0019] Furthermore, board-end connectors are installed on the back of the second PCBA board, and adhesive is applied to the four perimeter of the back of the second PCBA board to bond with the side of the back cover.

[0020] Furthermore, the bottom surface of the back cover has a second through hole for the board end connector of the second layer PCBA board to pass through. The bottom surface of the back cover has an annular protrusion extending towards the front cover. The second layer PCBA board is placed in the area enclosed by the annular protrusion. An embedding groove is also provided on the surface of the back cover between the annular protrusion and the four periphery of the back cover. There are notches on the four periphery of the annular protrusion. A square sealing ring is installed in the embedding groove. The inner sidewalls of the square sealing ring are provided with lugs that fit into the notches.

[0021] A limiting lug is provided on one corner of the rear cover, extending toward the front cover and cooperating with the limiting groove in the front cover. A third mounting hole is provided on the symmetrical corner of the rear cover.

[0022] Furthermore, the front end of the FAKRA connector is fitted with a sealing ring. After the sealing ring is fitted on the front end of the FAKRA connector, it passes through the second through hole in the back cover and connects to the board end connector. The back cover and the FAKRA connector are connected by a third screw.

[0023] The beneficial effects of this utility model are:

[0024] 1. A floating connector is used to flexibly connect the two PCBA boards. The first PCBA board is fixed to the front cover, and then the second PCBA board is connected to the first PCBA board. Finally, the second PCBA board is fixed to the side wall of the rear cover with glue. The floating connector effectively offsets the cumulative tolerance and ensures the connection accuracy of each component.

[0025] 2. The front cover is designed with a first-layer PCBA board positioning structure to improve the installation stability of the first-layer PCBA board, thereby ensuring the sensor positioning accuracy, shortening the AA time, and improving the average AA efficiency by 16%.

[0026] 3. Before the AA process, this utility model applies Plasma treatment to the bonding areas of the lens flange and the front cover to improve the bonding strength of the AA adhesive and reduce the risk of the lens falling off. Attached Figure Description

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0028] Figure 1 This is a schematic diagram of the structure of this utility model;

[0029] Figure 2 This is a cross-sectional view of the present invention;

[0030] Figure 3 This is an exploded view of this utility model;

[0031] Figure 4 This is a utility model Figure 3 An exploded view from another direction;

[0032] Figure 5 This is a schematic diagram of the structure of the front cover of this utility model;

[0033] Figure 6 This is a utility model Figure 5 A structural diagram from another direction;

[0034] Figure 7 This is a schematic diagram of the structure of the first layer PCBA board of this utility model;

[0035] Figure 8 This is a schematic diagram of the structure of the back cover of this utility model;

[0036] 1. Optical lens,

[0037] 2. Front cover, 201. Anti-fouling rib, 202. Supporting boss, 203. Positioning post, 204. Annular boss bonding area, 205. Second mounting hole, 206. Annular boss, 207. Limiting protrusion, 208. First mounting hole, 209. Limiting groove, 210. First through hole,

[0038] 3. First layer PCBA board: 301. Foolproof notch, 302. Positioning hole, 303. Grounding hole, 304. Photosensitive chip, 305. Floating connector male pin.

[0039] 4. Second layer PCBA board, 401. Floating connector female, 402. Board end connector,

[0040] 5. Rear cover, 501. Second through hole, 502. Limiting lug, 503. Annular protrusion, 504. Embedding groove, 505. Third mounting hole, 506. Notch,

[0041] 6. FAKRA connector, 8. First screw, 9. Second screw, 10. Adhesive, 11. Square sealing ring, 12. Sealing ring, 13. Third screw. Detailed Implementation

[0042] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0043] like Figures 1-8 The vehicle-mounted camera module shown includes

[0044] Optical lens 1 focuses external light onto the image sensor, directly affecting image quality. It includes components such as optical lenses, spacers, light shields, and lens barrels. These are existing technologies, and appropriate specifications are selected according to requirements.

[0045] The housing is divided into a front cover 2 and a rear cover 5. The front cover 2 and the rear cover 5 are assembled to form an installation space.

[0046] The first PCBA board 3 has a photosensitive chip 304 that converts light signals into electrical signals attached to its front end surface. The first PCBA board 3 is installed inside the front cover 2. The optical lens 1 is installed on the front cover 2, and the optical axis center of the optical lens 1 is aligned with the optical axis center of the photosensitive chip 304 to maintain the effective focal length (EFL) within the range of 0.95±0.05mm. A floating connector male 305 is installed on the rear end surface of the first PCBA board 3.

[0047] The second PCBA board 4 has a floating connector female head 401 that mates with the floating connector male head 305 installed at its front end, realizing a soft connection of the floating connector. This connection method can offset some of the effects of tolerance accumulation. The second PCBA board 4 is fixed on the back cover 5.

[0048] FAKRA connector 6 is an external power supply and signal transmission interface. One end of FAKRA connector 6 is connected to the second layer PCBA board 4, and the other end of FAKRA connector 6 is connected to an external connector for power supply.

[0049] like Figure 5 As shown, an anti-fooling rib 201 is provided on one inner side wall of the front cover 2 to prevent the first layer PCBA board 3 from being installed in reverse. One end of the front cover 2 is open, and a first through hole 210 is provided on the end face of the other end of the front cover 2. A step is provided along the edge of the first through hole 210, and a second mounting hole 205 is symmetrically provided on the step. Supporting bosses 202 for supporting the first layer PCBA board 3 are provided on the four corners of the inner end face of the front cover 2, that is, distributed around the perimeter. Positioning posts 203 are provided on the supporting bosses 202.

[0050] like Figure 6 As shown, the outer end face of the front cover 2 is provided with an annular protrusion 206 for supporting the optical lens 1. The annular protrusion 206 is the mounting reference of the optical lens 1. The outer circumferential wall of the annular protrusion 206 is provided with symmetrically arranged limiting protrusions 207, thereby constraining the circumferential displacement of the optical lens 1. The top surface of the annular protrusion 206 is the annular protrusion bonding area 204.

[0051] like Figures 2-3 As shown, the optical lens 1 is provided with a flange bonding area 101 that cooperates with the annular boss bonding area 204.

[0052] like Figure 7 As shown, the contact surface of the support boss 202 is a conductive surface (it can conduct electricity after removing the surface plating). Both ends of the first PCBA board 3 are provided with bare copper areas, which are connected to the grounding terminal of the first PCBA board 3. A grounding hole 303 is provided on the grounding terminal of the first PCBA board 3 to provide a grounding wire to connect to the grounding terminal of the first PCBA board 3, thereby enhancing electromagnetic interference resistance. The grounding terminal of the first PCBA board 3 contacts the conductive surface of the support boss 202 and is secured by the second screw 9.

[0053] like Figure 5 As shown, the front cover 2 has two symmetrically arranged corners with first mounting holes 208. The front cover 2 and the rear cover 5 are connected by a first screw 8 passing through the first mounting holes 208. A limit groove 209 is provided at the lower end of the other corner of the front cover 2.

[0054] like Figure 7 As shown, a foolproof notch 301 is installed on one side edge of the first layer PCBA board 3, which cooperates with the foolproof rib 201 in the front cover 2. A positioning hole 302 is opened on the surface of the first layer PCBA board 3, which cooperates with the positioning post 203 in the front cover 2, to accurately fix the first layer PCBA board 3.

[0055] Among them, the four periphery of the first PCBA board 3 and the inner wall of the front cover 2 are provided with a gap for heat dissipation. The gap distance is 0.8 to 2 mm, which is used to reserve an air convection heat dissipation channel to achieve heat dissipation.

[0056] like Figure 4 As shown, a board-end connector 402 is installed on the back of the second PCBA board 4. Adhesive 10 is provided on the four periphery of the back of the second PCBA board 4 to bond with the side of the back cover 5. That is, four-segment adhesive is applied to the back of the second PCBA board 4, and the adhesive 10 is bonded and fixed to the side wall of the back cover 5.

[0057] like Figure 8As shown, the bottom surface of the rear cover 5 has a second through hole 501 for the board end connector 402 of the second PCBA board 4 to pass through. The bottom surface of the rear cover 5 has an annular protrusion 503 extending towards the front cover 2, forming a waterproof isolation area for the second PCBA board 4. The second PCBA board 4 is placed in the area enclosed by the annular protrusion 503. The rear cover 5 also has an embedding groove 504 between the annular protrusion 503 and the four periphery of the rear cover 5. The four periphery of the annular protrusion 503 is provided with notches 506. A square sealing ring 11 is installed in the embedding groove 504. In order to achieve a better sealing effect and prevent external dust or moisture from entering the camera module, the inner sidewalls of the square sealing ring 11 are provided with lugs that fit into the notches 506 to prevent the square sealing ring 11 from twisting.

[0058] The rear cover 5 has a limiting lug 502 extending toward the front cover 2 and cooperating with the limiting groove 209 in the front cover 2 on one corner, and a third mounting hole 505 is provided on the symmetrical corner of the rear cover 5.

[0059] like Figures 3-4 As shown, the front end of the FAKRA connector 6 is fitted with a sealing ring 12. In order to prevent external dust or moisture from entering the camera module, there is a certain amount of compression between the sealing ring 12 and the back cover 5. After the sealing ring 12 is fitted on the front end of the FAKRA connector 6, it passes through the second through hole 501 in the back cover 5 and connects to the board connector 402. The back cover 5 and the FAKRA connector 6 are connected by a third screw 13, and the contact surfaces of the two are made conductive (conductive after removing the plating layer on the surface), which serves to ground and shield electromagnetic interference.

[0060] Work process:

[0061] Step 1: During installation, the anti-foolproof notch 301 of the first layer PCBA board 3 is aligned with the anti-foolproof rib 201 of the front cover 2. The positioning hole 302 of the first layer PCBA board 3 passes through the positioning post 203 and contacts the supporting boss 202, and is fixed by the second screw 9.

[0062] Step 2: Insert the floating connector female head 401 in the second layer PCBA board 4 into the floating connector male head 305 in the first layer PCBA board 3. Apply four-segment adhesive to the back of the second layer PCBA board 4, and bond and fix the adhesive 10 to the side wall of the back cover 5. Step 3: Before AA assembly, apply Plasma treatment to the bonding area 204 of the optical lens 101 and the annular boss of the front cover.

[0063] Step 4: First, apply AA glue 7 to the bonding area 204 of the annular boss, then clamp the optical lens 1 to perform the AA action and perform UV pre-curing for 15 seconds; after the pre-curing is completed, perform high-temperature curing at 80℃ for 1 hour.

[0064] Step 5: Install the square sealing ring 11 in the groove on the top surface of the back cover 5, then the second through hole 501 through which the board end connector 402 of the second layer PCBA board 4 passes, and then the front cover 2 and the back cover 5 are connected by the first screw 8.

[0065] Step 6: After the sealing ring 12 is put on the front end of the FAKRA connector 6, it passes through the second through hole 501 of the back cover 5 and connects to the board end connector 402 of the second layer PCBA board 4. Then, the back cover 5 and the flange of the FAKRA connector 6 are connected by the third screw 13. The FAKRA connector 6 is electrically connected to the external connector, which is the interface for external power supply and signal transmission.

[0066] Step 7: After the camera module assembly is completed, water tightness test and EOL test are carried out on the production line.

[0067] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A vehicle-mounted camera module, characterized in that: include Optical lens (1), The housing is divided into a front cover (2) and a rear cover (5). The front cover (2) and the rear cover (5) are assembled to form an installation space. The first PCBA board (3) has a photosensitive chip (304) that converts light signals into electrical signals attached to the front end surface of the first PCBA board (3). The first PCBA board (3) is installed inside the front cover (2). The optical lens (1) is installed on the front cover (2), and the optical axis center of the optical lens (1) is aligned with the optical axis center of the photosensitive chip (304) to maintain the effective focal length EFL. The rear end surface of the first PCBA board (3) is equipped with a floating connector male head (305). The second PCBA board (4) has a floating connector female head (401) that mates with the floating connector male head (305) installed at the front end to realize the floating connector soft connection. The second PCBA board (4) is installed on the back cover (5). The FAKRA connector (6) is an external power supply and signal transmission interface. One end of the FAKRA connector (6) is connected to the second-layer PCBA board (4), and the other end of the FAKRA connector (6) is connected to an external connector for power supply.

2. The vehicle-mounted camera module according to claim 1, characterized in that: The front cover (2) has an anti-fooling rib (201) on one inner side wall. One end of the front cover (2) is open. The other end of the front cover (2) has a first through hole (210). A step is provided along the edge of the first through hole (210). A second mounting hole (205) is symmetrically provided on the step. The four corners of the inner end face of the front cover (2) are provided with a support boss (202) for supporting the first layer PCBA board (3). A positioning post (203) is provided on the support boss (202).

3. The vehicle-mounted camera module according to claim 2, characterized in that: The front cover (2) has an annular protrusion (206) on its outer end face to support the optical lens (1). The annular protrusion (206) has symmetrically arranged limiting protrusions (207) on its outer circumferential wall. The top surface of the annular protrusion (206) is the annular protrusion bonding area (204). The optical lens (1) is provided with a flange bonding area (101) that matches the annular boss bonding area (204).

4. A vehicle-mounted camera module according to claim 2, characterized in that: The contact surface of the support boss (202) is a conductive surface. Both ends of the first PCBA board (3) are provided with bare copper areas. The bare copper areas are connected to the grounding end of the first PCBA board (3). A grounding hole (303) is provided on the grounding end of the first PCBA board (3) to provide a grounding wire to connect to the grounding end of the first PCBA board (3). The grounding end of the first PCBA board (3) contacts the conductive surface of the support boss (202) and is installed by the second screw (9).

5. A vehicle-mounted camera module according to claim 1, characterized in that: The front cover (2) has two symmetrically arranged corners with first mounting holes (208). The front cover (2) and the rear cover (5) are connected by a first screw (8) passing through the first mounting hole (208). A limit groove (209) is provided at the lower end of the other corner of the front cover (2).

6. The vehicle-mounted camera module according to claim 1, characterized in that: The first layer PCBA board (3) has a non-fake notch (301) installed on one side edge to cooperate with the non-fake rib (201) in the front cover (2), and a positioning hole (302) is opened on the surface of the first layer PCBA board (3) to cooperate with the positioning post (203) in the front cover (2).

7. A vehicle-mounted camera module according to claim 1, characterized in that: The first layer PCBA board (3) has a gap for heat dissipation between its four peripheries and the inner wall of the front cover (2). The gap is 0.8 to 2 mm long. The effective focal length (EFL) between the optical lens (1) and the photosensitive chip (304) is 0.95 ± 0.05 mm.

8. A vehicle-mounted camera module according to claim 1, characterized in that: The back of the second PCBA board (4) is equipped with a board-end connector (402), and the four sides of the back of the second PCBA board (4) are provided with adhesive (10) to bond with the side of the back cover (5).

9. A vehicle-mounted camera module according to claim 1, characterized in that: The bottom surface of the rear cover (5) is provided with a second through hole (501) for the board end connector (402) of the second layer PCBA board (4) to pass through. The bottom surface of the rear cover (5) is provided with an annular protrusion (503) extending towards the front cover (2). The second layer PCBA board (4) is placed in the area enclosed by the annular protrusion (503). Between the annular protrusion (503) and the four periphery of the rear cover (5), an embedding groove (504) is also provided on the plate surface of the rear cover (5). The four periphery of the annular protrusion (503) is provided with notches (506). A square sealing ring (11) is installed in the embedding groove (504). The inner sidewalls of the square sealing ring (11) are provided with lugs that fit into the notches (506). The rear cover (5) has a limiting lug (502) extending toward the front cover (2) and cooperating with the limiting groove (209) in the front cover (2) on one corner, and a third mounting hole (505) is provided on the symmetrical corner of the rear cover (5).

10. A vehicle-mounted camera module according to claim 1, characterized in that: The front end of the FAKRA connector (6) is fitted with a sealing ring (12). After the sealing ring (12) is fitted on the front end of the FAKRA connector (6), it passes through the second through hole (501) in the rear cover (5) and connects to the board end connector (402). The rear cover (5) and the FAKRA connector (6) are connected by a third screw (13).

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