High-shielding camera module

Abstract

The utility model discloses a camera module with high shielding performance. The camera module comprises a shell assembly, a cable assembly and a shielding assembly, the shell assembly comprises a front cover, a rear cover and a circuit board, the front cover and the rear cover are welded and fixed, and the circuit board is locked and attached to the front cover after being positioned; the cable assembly and the rear cover are clamped and fixed, and sealant is arranged at a seam; the shielding assembly comprises a front shielding case located in the front cover and a rear shielding case located in the rear cover, the front shielding case is fixed to the front cover in a hot melting mode, the rear shielding case and the circuit board are synchronously locked and attached, and the rear shielding case is electrically connected with the outer conductor of the cable assembly through an elastic structure to form a grounding shielding loop. On one hand, the camera module is good in structural stability, on the other hand, the camera module has excellent anti-electromagnetic interference capability and good waterproof sealing performance, is convenient to assemble, reduces the production cost, and meets the requirements of vehicle-mounted and other complex scenes on the performance and the cost of the camera module.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of electric connector, especially relates to a high shielding property camera module. BACKGROUND

[0002] With the transformation of automobile industry to automation and intelligence, the vehicle-mounted camera as a core perception component, its performance directly determines the vehicle environment perception accuracy and user experience. The current mainstream vehicle-mounted camera is limited by the installation space, and adopts a plastic integrated rear cover connector structure, and a large number of electronic components such as radar and electronic control unit are distributed around the camera. These components will generate high-frequency electromagnetic radiation when working, which is easy to invade the camera interior and interfere with the image signal, resulting in imaging blur, screen flashing and other problems, affecting the reliability of the driving assistance function.

[0003] To solve the problem of electromagnetic interference, the vehicle-mounted camera module on the market currently adopts a shielding scheme of vacuum ion plating metal layer on the inside of the plastic shell, and is assisted by conductive tape connection. This scheme has the following disadvantages: 1. The vacuum ion plating equipment investment is large, and the operation cost is also relatively high; 2. The plating layer is easy to be scratched and worn in the process of assembly and use, resulting in a decrease in shielding effectiveness; 3. The conductive tape is easy to age under the high and low temperature cycle of the vehicle-mounted environment, and the adhesion and conductivity performance decline, resulting in unreliable shielding connection. Therefore, it is urgent to develop a new type of vehicle-mounted camera module shielding scheme with high shielding effectiveness, reliable connection and low cost. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a kind of high shielding property camera module to solve the deficiency of prior art.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0006] A kind of high shielding property camera module, including shell assembly, cable assembly and shielding assembly;The shell assembly includes front cover integrated with lens and rear cover provided with plug-in hole, and the end of the front cover close to the rear cover is installed with circuit board;The cable assembly includes coaxial line, the shielding layer and center line are exposed after stripping and cutting of one end of the coaxial line, and the center terminal is riveted on the center line, and the shielding layer is riveted with outer conductor through copper pipe;Insulating medium is provided between the outer conductor and the center terminal;The connection place of the outer conductor and the shielding layer is covered with encapsulating piece fixedly connected with the rear cover;The shielding assembly includes front shielding cover and rear shielding cover;The front shielding cover is covered on one side of the circuit board close to the lens, and a light hole is formed in the middle part;The rear shielding cover is covered on one side of the circuit board close to the rear cover, and is in electrical contact with the front shielding cover and the outer conductor side wall at the same time.

[0007] Further, one end of the front cover close to the rear cover is provided with a fixing column, and the front shielding cover is provided with a fixing hole correspondingly; the fixing column is deformed to form a mushroom head limiting structure through a hot pressing process after penetrating the fixing hole, so that the front shielding cover and the front cover are fixed firmly.

[0008] Further, the rear shielding cover comprises a shielding side plate which is attached to the inner side wall of the rear cover, a shielding bottom plate which covers the inner bottom surface of the rear cover, and a fixing plate which is formed by the shielding side plate being bent and extended; the fixing plate is used for fixedly connecting with the circuit board.

[0009] Further, the circumferential edge of the front shielding cover is provided with a plurality of elastic abutting pieces which extend to the rear shielding cover and have elasticity; the abutting pieces elastically abut against the shielding side plate of the rear shielding cover.

[0010] Further, the fixing plate of the rear shielding cover and the circuit board are both provided with mounting holes, and the rear shielding cover and the circuit board are fixedly connected through screws on the front cover.

[0011] Further, the circuit board is provided with a positioning hole, and the front cover is provided with a positioning column correspondingly; after the circuit board is positioned through cooperation of the positioning column and the positioning hole, the circuit board is fixed to the front cover through screws.

[0012] Further, the shielding bottom plate of the rear shielding cover is provided with a via hole through which the outer conductor penetrates, and a plurality of elastic clamping claws extend to the front cover from the edge of the via hole; the elastic clamping claws elastically abut against the outer conductor.

[0013] Further, the outer circumferential surface of the outer conductor is provided with an annular stepped structure which cooperates with the elastic clamping claws, and the annular stepped structure axially limits the rear shielding cover.

[0014] Further, the front cover and the rear cover are fixedly connected after being welded.

[0015] Further, the joint between the cable assembly and the rear cover is filled with sealant.

[0016] Compared with the prior art, the high shielding camera module has the following beneficial technical effects:

[0017] 1、The front shielding cover and the rear shielding cover are arranged, the rear shielding cover is tightly and electrically connected with the outer conductor through the elastic clamping claws, a complete grounding shielding loop is formed, and good anti-electromagnetic interference capability is achieved.

[0018] 2, the utility model discloses a hot melt fixed front shielding cover, and the rear shielding cover and circuit board are fixed synchronously through screw, and the front cover is welded with the rear cover and is installed, is easy to assemble, reduces production cost's simultaneously still has good structural stability and waterproof tightness, can satisfy the performance and cost demand of complex scene such as vehicle-mounted to camera module very well. BRIEF DESCRIPTION OF DRAWINGS

[0019] The drawings in the following description are only some embodiments, and other drawings can be obtained according to these drawings without creative labor for ordinary skilled in the art. In the drawings:

[0020] Figure 1 The overall structure schematic diagram of a high shielding camera module is provided for the utility model embodiment;

[0021] Figure 2 The explosion view of a high shielding camera module is provided for the utility model embodiment;

[0022] Figure 3 The sectional view of a high shielding camera module is provided for the utility model embodiment;

[0023] Figure 4 The assembly mode schematic diagram of cable assembly and rear cover in a high shielding camera module is provided for the utility model embodiment;

[0024] Figure 5 The structure schematic diagram of front cover in a high shielding camera module is provided for the utility model embodiment;

[0025] Figure 6 The structure schematic diagram of rear cover in a high shielding camera module is provided for the utility model embodiment;

[0026] Figure 7 The structure schematic diagram of front shielding cover in a high shielding camera module is provided for the utility model embodiment;

[0027] Figure 8 The structure schematic diagram of rear shielding cover in a high shielding camera module is provided for the utility model embodiment.

[0028] In the drawings, the component list represented by each sign is as follows:

[0029] 1-Front cover, 101-Lens, 102-Limiting groove, 103-First mounting hole, 104-Fixing post, 105-Positioning post, 2-Rear cover, 201-Insertion hole, 202-Allowing groove, 203-Limiting boss, 3-Circuit board, 301-Coaxial board end connector, 302-Second mounting hole, 303-Positioning hole, 4-Cable assembly, 401-Center terminal, 402-Outer conductor, 403-Riveted section, 404 - Annular stepped structure, 405-Copper tube, 406-Insulating medium, 407-Encapsulation component, 408-Snap fastener, 409-Coaxial cable, 5-Sealant, 6-Front shield, 601-Light transmission hole, 602-Fixing hole, 603-Abutting piece, 7-Rear shield, 701-Shielding side plate, 702-Shielding base plate, 703-Fixing plate, 704-Third mounting hole, 705-Through hole, 706-Elastic claw, 8-Screw. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0031] like Figures 1 to 8 As shown, this utility model embodiment provides a highly shielded camera module, which is particularly suitable for scenarios with complex electromagnetic environments such as vehicle-mounted installations. It mainly includes a housing assembly, a cable assembly 4, and a shielding assembly. The specific structures of each component are as follows:

[0032] The shell assembly is used as the mounting carrier and external protection structure of the camera module, comprising a front cover 1, a rear cover 2 and a circuit board 3. The front cover 1 is integrally injection molded by plastic material, and has an integrated structure of "front-end cylinder + rear-end plate". The lens 101 is directly integrated at the front end of the front cover 1. The rear end of the front cover 1 (i.e. the end close to the rear cover 2) is not only provided with a limiting groove 102 for covering the rear cover 2, but also integrally formed with a plurality of first mounting holes 103 for mounting the circuit board 3 and at least two outwardly protruding fixing columns 104 for fixing the shielding assembly. The circuit board 3 is provided with second mounting holes 302 corresponding to the positions of the first mounting holes 103, and is fixed to the rear end of the front cover 1 by screws 8. Furthermore, the circuit board 3 is provided with an image sensor, a signal processing circuit and a coaxial board connector 301 for connecting with the cable assembly 4. Further, in order to prevent the circuit board 3 from shaking and mispositioning when locking the screws 8, the circuit board 3 is further provided with positioning holes 303 beside the second mounting holes 302, and the front cover 1 is correspondingly provided with positioning columns 105. The circuit board 3 is precisely positioned by cooperation of the positioning columns 105 and the positioning holes 303, and then is fixed to the front cover 1 by the screws 8, thereby improving the assembly efficiency and yield.

[0033] The rear cover 2 is also integrally injection molded by plastic material, and has a rectangular cavity shape. An insertion hole 201 is formed on the panel at the rear end of the rear cover 2 to provide an installation channel for the cable assembly 4. The front cover 1 and the rear cover 2 are aligned and covered, and are fixed by welding. In this embodiment, the laser transmission welding process is used to circumferentially weld and fix the joint surfaces of the front cover 1 and the rear cover 2. This fixing method is firm and reliable, has good consistency, and can ensure that the camera module has good waterproof sealing performance.

[0034] The cable assembly 4 is used to mate with the coaxial board connector 301 on the circuit board 3 to realize signal transmission between the module and external equipment. The cable assembly 4 comprises a coaxial cable 409, a center terminal 401, an outer conductor 402, an insulating medium 406 and an encapsulating member 407. The coaxial cable 409 comprises, from outside to inside, an outer insulating layer, a shielding layer, an inner insulating layer and a center line. The coaxial cable 409 is subjected to stripping treatment at one end thereof towards the circuit board 3: part of the outer insulating layer is stripped off, the inner shielding layer is exposed, the inner insulating layer inside the shielding layer is stripped off, and the center line in the center is exposed. The exposed segments of the shielding layer and the center line are in a "stepped" distribution. The center terminal 401 is tightly riveted with the exposed segment of the center line. The outer conductor 402 is a metal cylinder, and a copper pipe 405 is sleeved on a riveting segment 403 of the outer conductor 402. The riveting segment 403 of the outer conductor 402 is tightly riveted with the exposed segment of the shielding layer by riveting the copper pipe 405. The insulating medium 406 is sleeved on the outer periphery of the center terminal 401 and fills the gap between the outer conductor 402 and the center terminal 401, is fixed by riveting dots (protrusions formed by stamping on the outer periphery of the outer conductor 402), prevents the center terminal 401 from moving axially or radially, and ensures electrical insulation between the outer conductor 402 and the center terminal 401.

[0035] The encapsulating member 407 is integrally injection molded and tightly covers the outer insulating layer of the coaxial cable 409 and the riveting segment 403 of the outer conductor 402, thereby sealing the connection part of the cable and the outer conductor 402. Two buckles 408 are symmetrically arranged on the outer periphery of the insertion end of the encapsulating member 407. Correspondingly, the inner wall of the insertion hole 201 of the rear cover 2 is formed with an avoiding groove 202 for the buckles 408 to pass through and a limiting boss 203 for being engaged with the buckles 408. When the buckle 408 passes through the avoiding groove 202, it can be engaged with the limiting boss 203 by being axially rotated by 90°, thereby being fixed by latching, and avoiding the internal connection from being loosened due to pulling of the cable.

[0036] In order to further ensure the waterproof sealing of the connector, the joint between the cable assembly 4 and the rear cover 2 is filled with sealing glue 5. Specifically, the sealing glue 5 is filled in the joint between the end face of the encapsulating member 407, the outer wall of the outer conductor 402 and the insertion hole 201 of the rear cover 2, and the joint between the end face of the insulating medium 406, the outer wall of the center terminal 401 and the inner wall of the outer conductor 402, so as to form multiple sealing barriers.

[0037] The shielding assembly, as the core of anti-electromagnetic interference, functions to form a continuous electromagnetic shielding cavity, protects the internal circuit from external electromagnetic interference and suppresses internal electromagnetic radiation. The shielding assembly comprises a front shielding cover 6 on the front cover and a rear shielding cover 7 in the rear cover 2.

[0038] The front shielding cover 6 is formed by stamping a metal sheet, is located in the front cover 1, covers one side of the circuit board 3 close to the lens 101, and is provided with a light passing hole 601 in the middle. The aperture of the light passing hole 601 is adapted to the light transmission area of the lens 101, so as to ensure that the light reaches the image sensor on the circuit board 3 without obstruction. The front shielding cover 6 is provided with a fixing hole 602 adapted to the fixing column 104 formed on the front cover 1. When the front shielding cover 6 is installed at the rear end of the front cover 1, the fixing column 104 passes through the fixing hole 602, and the end of the fixing column 104 is deformed to form a mushroom head limiting structure by a hot pressing process, so as to firmly fix the front shielding cover 6 and the front cover 1. In addition, the circumferential edge of the front shielding cover 6 is provided with a plurality of elastic abutting pieces 603 extending towards the rear shielding cover 7, so as to ensure that the rear shielding cover 7 forms a good and stable electrical contact.

[0039] The rear shielding cover 7 is also formed by stamping a metal sheet, covers one side of the circuit board 3 close to the rear cover 2, and is in electrical contact with the abutting pieces 603 of the front shielding cover 6 and the side wall of the outer conductor 402, so as to form a grounding shielding loop. In this embodiment, the rear shielding cover 7 includes a shielding side plate 701, a shielding bottom plate 702, and a fixing plate 703. The shielding side plate 701 is attached to the inner side wall of the rear cover 2 to provide side shielding. When assembled, the abutting pieces 603 of the front shielding cover 6 can continuously and elastically contact the shielding side plate 701 of the rear shielding cover 7 to form a stable conduction path. The shielding bottom plate 702 covers the inner bottom surface of the rear cover 2 to provide bottom shielding, and is provided with a through hole 705 for the outer conductor 402 to pass through. The edge of the through hole 705 extends towards the front cover 1 and is provided with a plurality of elastic clamping claws 706. The elastic clamping claws 706 adopt a cantilever beam structure and elastically abut the outer circumferential surface of the outer conductor 402. Correspondingly, the outer circumferential surface of the outer conductor 402 is also provided with an annular step structure 404 matched with the elastic clamping claws 706, so as to axially limit the rear shielding cover 7. The fixing plate 703 is formed by bending and extending the shielding side plate 701, is used for fixedly connecting with the circuit board 3, is provided with a third mounting hole 704, and the third mounting hole 704 on the fixing plate 703 matches the position of the second mounting hole 302 on the circuit board 3. The rear shielding cover 7 and the circuit board 3 are fixedly connected by a screw 8 at the rear end of the front cover 1, so as to realize the grounding of the circuit board 3, the fixation of the rear shielding cover 7, and the electrical connection with the front shielding cover 6.

[0040] The assembling steps of the utility model are as follows: first, the front shielding cover 6 is fixed on the front cover 1 by hot melting, then the circuit board 3 is installed on the front cover 1; then the rear shielding cover 7 is fixed on the front cover 1 by screw 8 after aligning with the circuit board 3; subsequently, the assembled cable assembly 4 is fixedly connected with the rear cover 2 through the encapsulating piece 407, then the sealant 5 is filled in the joints; finally, the front cover 1 assembly and the rear cover 2 assembly are aligned and folded and fixed by laser welding, thereby completing the assembling of the whole module.

[0041] The above-mentioned embodiments only express the implementation manners of the utility model, and the description is more specific and detailed, but it cannot be understood as the limitation of the utility model patent scope. It should be pointed out that for the ordinary skilled in the art, without departing from the concept of the utility model, a number of modifications and improvements can be made, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent should be subject to the appended claims.

Claims

1. A high shielding camera module, characterized in that, The shell assembly, the cable assembly (4) and the shielding assembly are included; The shell assembly includes a front cover (1) integrated with a lens (101) and a rear cover (2) provided with a plug-in hole (201), and a circuit board (3) is mounted on one end of the front cover (1) close to the rear cover (2); The cable assembly (4) includes a coaxial line (409), one end of the coaxial line (409) is stripped to expose a shielding layer and a center line, a center terminal (401) is riveted on the center line, and the shielding layer is riveted with an outer conductor (402) through a copper pipe (405); an insulating medium (406) is arranged between the outer conductor (402) and the center terminal (401); and the connection part of the outer conductor (402) and the shielding layer is covered with an encapsulating part (407) fixedly connected with the rear cover (2); The shielding assembly includes a front shielding cover (6) and a rear shielding cover (7); the front shielding cover (6) is arranged on one side of the circuit board (3) close to the lens (101), and a light passing hole (601) is formed in the middle part; the rear shielding cover (7) is arranged on one side of the circuit board (3) close to the rear cover (2), and is in electrical contact with the front shielding cover (6) and the side wall of the outer conductor (402) at the same time.

2. The high shielding camera module of claim 1, wherein, One end of the front cover (1) close to the rear cover (2) is provided with a fixed column (104), and the front shielding cover (6) is provided with a fixed hole (602) corresponding; after the fixed column (104) passes through the fixed hole (602), a mushroom head-shaped limiting structure is formed by a hot pressing process, so that the front shielding cover (6) and the front cover (1) are firmly fixed.

3. The high shielding camera module of claim 1, wherein, The rear shielding cover (7) includes a shielding side plate (701) attached to the inner side wall of the rear cover (2), a shielding bottom plate (702) covering the inner bottom surface of the rear cover (2), and a fixing plate (703) formed by bending and extending the shielding side plate (701); the fixing plate (703) is used for fixedly connecting with the circuit board (3).

4. The high shielding camera module of claim 3, wherein, The circumferential edge of the front shielding cover (6) is provided with a plurality of elastic abutting pieces (603) extending to the rear shielding cover (7), and the abutting pieces (603) are in elastic abutment with the shielding side plate (701) of the rear shielding cover (7).

5. The high shielding camera module of claim 3, wherein, The fixing plate (703) of the rear shielding cover (7) and the circuit board (3) are both provided with mounting holes, and the rear shielding cover (7) and the circuit board (3) are fixedly locked on the front cover (1) through screws (8).

6. The high shielding camera module of claim 5, wherein, The circuit board (3) is provided with a positioning hole (303), and the front cover (1) is provided with a positioning column (105) corresponding; after the circuit board (3) is positioned through the cooperation of the positioning column (105) and the positioning hole (303), the circuit board (3) is fixed with the front cover (1) through screws (8).

7. The high shielding camera module of claim 3, wherein, The shielding bottom plate (702) of the rear shielding cover (7) is provided with a via hole (705) for the outer conductor (402) to pass through, and a plurality of elastic clamping claws (706) extend to the front cover (1) at the edge of the via hole (705), and the elastic clamping claws (706) are in elastic abutment with the outer conductor (402).

8. The high shielding camera module of claim 7, wherein, The outer circumferential surface of the outer conductor (402) is provided with an annular step structure (404) matched with the elastic clamping claw (706), and the annular step structure (404) axially limits the rear shielding cover (7).

9. The high shielding camera module according to any one of claims 1-8, wherein, After the front cover (1) and the rear cover (2) are closed, they are welded and fixed.

10. The high shielding camera module according to any one of claims 1-8, wherein, The joint between the cable assembly (4) and the rear cover (2) is filled with sealant (5).

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