Camera module anti-electromagnetic interference structure

Abstract

The utility model discloses a kind of camera module anti-electromagnetic interference structures, comprising: protective shell, bottom detachably installed with shell cover, top is installed with protective sleeve through;Anti-electromagnetic mechanism, inside the protective shell is installed, for improving the anti-electromagnetic interference of camera;Circuit board, inside the protective shell is installed, and top central place is fixedly installed with camera, the top of camera passes through protective sleeve and extends to the top of protective sleeve;Through the setting of anti-interference mechanism, anti-interference casing in anti-electromagnetic mechanism and abutment shell plate cooperate to form closed shielding space, circuit board and camera bottom connecting end are completely wrapped, the propagation path of electromagnetic interference is directly blocked, both can actively absorb external electromagnetic interference, and electromagnetic radiation generated by internal element can be inhibited, avoid interference to other equipment.

Description

Technical Field

[0001] This utility model relates to the field of camera module technology, specifically to an anti-electromagnetic interference structure for a camera module. Background Technology

[0002] With the rapid development of electronic technology, camera modules are increasingly widely used in security monitoring, smart terminals, autonomous driving, and industrial inspection. However, in complex electromagnetic environments, camera modules are susceptible to external electromagnetic interference, leading to clutter, rolling interference, ripple interference, or even signal loss in image signals, severely affecting imaging quality and system stability. For example, in 5G communication base stations, automotive millimeter-wave radar, or industrial automation scenarios, high-frequency electromagnetic radiation (such as the GHz band) may interfere with the circuit board and camera connection terminals of the camera module through spatial coupling or conduction paths, thereby compromising the integrity of image data.

[0003] The industry's electromagnetic interference (EMI) protection design for camera modules mainly adopts a single shielding method, such as pasting a metal shielding film on the inner wall of the protective shell, or simply wrapping it with a metal shell. However, these solutions have obvious drawbacks: the shielding effect of the metal shielding film is limited, and it is easy to fall off during installation or use. It cannot stably block electromagnetic interference in a wide frequency range for a long time. Therefore, we need to propose an EMI protection structure for camera modules. Utility Model Content

[0004] The purpose of this invention is to provide an anti-electromagnetic interference structure for a camera module to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] An electromagnetic interference-resistant structure for a camera module, comprising:

[0007] The protective shell has a detachable cover at the bottom and a protective sleeve installed through the top.

[0008] The circuit board is installed inside the protective housing, and a camera is fixedly installed at the top center. The top of the camera extends through the protective sleeve to the top of the protective sleeve.

[0009] An electromagnetic interference shield, installed inside the protective housing, is used to improve the camera's resistance to electromagnetic interference.

[0010] The electromagnetic interference suppression mechanism includes a heat-conducting plate, which is detachably mounted on the inner wall of the protective shell. The circuit board is fixedly mounted at the top center of the heat-conducting plate. An anti-interference shell is fixedly mounted on the outside of the heat-conducting plate and the circuit board. The anti-interference shell has a cylindrical structure with open ends, which can completely cover the circuit board and the bottom connection end of the camera. An abutment shell plate that works with the anti-interference shell is fixedly mounted on the inner top of the protective shell. Together with the anti-interference shell, they form a closed shielding space, which completely encloses the bottom connection end of the circuit board and the camera within the shielding space, thereby blocking the propagation path of electromagnetic interference.

[0011] Preferably, the bottom of the abutting shell plate is provided with an abutting groove, and the top of the anti-interference shell is inserted into the abutting groove.

[0012] Preferably, the protective sleeve, heat-conducting plate, anti-interference shell, and abutment shell are all made of heat-conducting and wave-absorbing material, which is a composite of carbonyl iron particles, heat-conducting silicone and glass fiber cloth.

[0013] Preferably, the distance between the inner wall of the anti-interference housing and the edge of the circuit board is -mm, and the height is higher than the maximum height of the electronic components on the circuit board.

[0014] Preferably, the bottom of the heat-conducting plate is fixedly equipped with several sets of heat dissipation fins at equal intervals, and the side wall of the protective shell is provided with several sets of ventilation holes, and a dustproof net is fixedly installed inside the ventilation holes.

[0015] Preferably, fixing blocks are fixedly installed at the four corners of the inner wall of the protective shell, and second bolts are installed between the top of the heat-conducting plate and the bottom of the four sets of fixing blocks.

[0016] Preferably, the bottom of the shell cover has four sets of countersunk holes symmetrically arranged, and a first bolt is installed inside the countersunk hole. One end of the first bolt passes through the countersunk hole and is threaded into the inside of the protective shell.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] This utility model, through the setting of an anti-interference mechanism, forms a closed shielding space by cooperating the anti-interference shell and the abutment shell plate in the anti-electromagnetic mechanism, which completely wraps the circuit board and the bottom connection end of the camera, directly blocking the propagation path of electromagnetic interference. It can not only actively absorb external electromagnetic interference, but also suppress the electromagnetic radiation generated by internal components, thus avoiding interference to other devices. Attached Figure Description

[0019] Figure 1 This is a side view of the three-dimensional structure of the present invention;

[0020] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0021] Figure 3 This is a schematic diagram of the exploded structure of this utility model;

[0022] Figure 4 This is a schematic diagram of the anti-electromagnetic mechanism of this utility model.

[0023] In the diagram: 1. Protective shell; 2. Shell cover; 3. Protective sleeve; 4. Circuit board; 5. Camera; 6. Electromagnetic shielding mechanism; 61. Heat conduction plate; 62. Anti-interference shell; 63. Abutting shell plate; 64. Abutting groove; 65. Heat dissipation fins; 7. Fixing block; 8. Ventilation hole; 9. First bolt; 10. Second bolt. Detailed Implementation

[0024] 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 of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figure 1-4 This utility model provides a technical solution:

[0026] An electromagnetic interference-resistant structure for a camera module, comprising:

[0027] The protective shell 1 has a detachable cover 2 at the bottom and a protective sleeve 3 installed through the top;

[0028] Circuit board 4 is installed inside the protective shell 1, and camera 5 is fixedly installed at the top center. The top of camera 5 extends through the protective sleeve 3 to the top of the protective sleeve 3.

[0029] The protective shell 1 is made of high-strength aluminum alloy, which ensures structural stability and reduces overall weight. The connection surface between the shell cover 2 and the protective shell 1 is equipped with a rubber sealing gasket. The circuit board 4 is made of FR-4 epoxy glass cloth substrate with a thickness of 1.6mm and a 30μm thick solder resist layer. The edge of the circuit board 4 is provided with positioning holes, which are precisely connected to the mounting structure inside the protective shell 1 through positioning posts. The camera 5 is soldered onto the circuit board 4 using SMT surface mount technology. Lead-free solder is used for the solder joints, and thermal grease with a thickness of 0.2mm is applied to the connection area between the camera 5 and the circuit board 4. The lens part at the top of the camera 5 is made of sapphire glass. An elastic buffer ring is provided between the lens and the extended part of the protective sleeve 3. The buffer ring is made of silicone and its diameter is the same as the inner diameter of the sleeve.

[0030] Electromagnetic interference suppression mechanism 6 is installed inside the protective housing 1 to improve the electromagnetic interference resistance of camera 5;

[0031] In an optional embodiment: the electromagnetic interference suppression mechanism 6 includes a heat-conducting plate 61, which is detachably mounted on the inner wall of the protective shell 1. The circuit board 4 is fixedly mounted at the top center of the heat-conducting plate 61. An anti-interference shell 62 is fixedly mounted on the outside of the heat-conducting plate 61 and the circuit board 4. The anti-interference shell 62 is a cylindrical structure with open ends, which can completely cover the circuit board 4 and the bottom connection end of the camera 5. An abutment shell plate 63 that cooperates with the anti-interference shell 62 is fixedly mounted on the inner top of the protective shell 1. The abutment shell plate 63 cooperates with the anti-interference shell 62 to form a closed shielding space, which completely encloses the bottom connection end of the circuit board 4 and the camera 5 in the shielding space to block the propagation path of electromagnetic interference.

[0032] It should be noted that the contact surface of the heat-conducting plate 61 is coated with thermal paste, the thickness of which is 0.1mm. Through the cooperation of the heat-conducting plate 61, the anti-interference housing 62 and the abutment plate 63, not only can the bottom connection end of the circuit board 4 and the camera 5 be completely wrapped, but the structural strength of the housing is also enhanced, preventing the housing from deforming during use and ensuring the airtightness of the shielding space. The welding connection between the abutment plate 63 and the top of the inner part of the protective housing 1 ensures the firmness of the connection. The welded joint after grinding avoids the impact of uneven surface on the cooperation with the anti-interference housing 62, thereby ensuring the integrity of the closed shielding space, effectively blocking the propagation path of electromagnetic interference, and providing a good anti-electromagnetic interference environment for the bottom connection end of the circuit board 4 and the camera 5.

[0033] In an optional embodiment: the bottom of the abutting shell 63 is provided with an abutting groove 64, and the top of the anti-interference shell 62 is inserted into the abutting groove 64.

[0034] It should be noted that the depth of the abutment groove 64 is 5mm, and the width of the groove is 0.1mm greater than the wall thickness of the anti-interference housing 62. The abutment groove 64 enables a good connection between the anti-interference housing 62 and the abutment plate 63, further enhancing the shielding effect and preventing electromagnetic interference from entering through the gap between the two.

[0035] In an optional embodiment: the protective sleeve 3, the heat-conducting plate 61, the anti-interference shell 62 and the abutment shell 63 are all made of heat-conducting and wave-absorbing material, which is a composite of carbonyl iron particles, heat-conducting silicone and glass fiber cloth.

[0036] It should be noted that in this composite thermally conductive and microwave-absorbing material, the carbonyl iron particles have a particle size of 50-100 nm and are added at a ratio of 30%; the thermally conductive silicone has a thermal conductivity of 3 W / (m·K) and is added at a ratio of 50%; the glass fiber cloth is made of alkali-free glass fiber with a weaving density of 8×8 threads / cm. 2The addition ratio is 20%. In the preparation process of the material, carbonyl iron particles are first thoroughly mixed with thermally conductive silicone at a stirring speed of 1000 r / min for 30 min. Then, the mixed slurry is evenly coated on glass fiber cloth with a coating thickness of 2 mm. Finally, it is cured at 120℃ for 30 min to form the finished product. The thermal conductivity of the prepared material can reach 2.5 W / (m·K), and the wave absorption performance can reach more than -20 dB in the frequency range of 100 MHz-10 GHz.

[0037] Carbonyl iron particles possess excellent magnetic loss characteristics, effectively absorbing electromagnetic waves. Thermally conductive silicone provides good thermal conductivity, while fiberglass cloth enhances the material's mechanical strength and flexibility. The composite material combines thermal conductivity and wave absorption. The high thermal conductivity ensures that each component can quickly conduct internally generated heat away, preventing heat accumulation from affecting component performance and lifespan. Excellent wave absorption performance over a wide frequency range effectively absorbs external and internal electromagnetic interference, reducing its impact on camera 5 and circuit board 4, ensuring the imaging quality and operational stability of the camera module. The material's mechanical strength and flexibility also facilitate the processing and installation of each component.

[0038] In an optional embodiment, the distance between the inner wall of the anti-interference housing 62 and the edge of the circuit board 4 is 2-5 mm, and the height is higher than the maximum height of the electronic components on the circuit board 4.

[0039] It should be noted that the distance between the inner wall of the anti-interference housing 62 and the edge of the circuit board 4 can be adjusted according to the size of the circuit board 4 and the layout of the electronic components. Under normal circumstances, it is set to 3mm. The maximum height of the electronic components on the circuit board 4 is determined by three-dimensional measurement, and the height of the anti-interference housing 62 is 5mm higher than this maximum height.

[0040] The 2-5mm spacing design ensures that the anti-interference housing 62 effectively encloses and shields the circuit board 4, while also providing sufficient space for heat dissipation of the electronic components on the circuit board 4. This avoids affecting airflow due to insufficient spacing, thus ensuring heat dissipation. The height of the anti-interference housing 62 is higher than the maximum height of the electronic components, which can enclose all electronic components on the circuit board 4 in the shielding space, ensuring that each electronic component can receive effective anti-electromagnetic interference protection.

[0041] In an optional embodiment: several sets of heat dissipation fins 65 are fixedly installed at equal intervals on the bottom of the heat conduction plate 61, and several sets of ventilation holes 8 are opened on the side wall of the protective shell 1, and a dustproof net is fixedly installed inside the ventilation holes 8.

[0042] It should be noted that the heat dissipation fins 65 are made of pure copper, and the connection between the heat dissipation fins 65 and the heat conduction plate 61 is made by brazing. The thermal conductivity of the weld is similar to that of copper. The ventilation holes 8 are distributed in a matrix on the side wall of the protective shell 1. The ventilation holes 8 on the two side walls of the protective shell 1 are symmetrically arranged to form a convection air duct. The dust filter is made of stainless steel with a mesh size of 100 mesh. The dust filter is fixed inside the ventilation hole 8 by a snap-fit ​​method, which is convenient for disassembly and cleaning.

[0043] In an optional embodiment: fixing blocks 7 are fixedly installed at the four corners of the inner wall of the protective shell 1, and second bolts 10 are installed between the top of the heat-conducting plate 61 and the bottom of the four sets of fixing blocks 7.

[0044] It should be noted that the fixing block 7 is made of stainless steel. The connection between the fixing block 7 and the inner wall of the protective shell 1 is made by welding. The weld is inspected for defects to ensure the welding quality. The heat-conducting plate 61 has a threaded hole corresponding to the fixing block 7. The second bolt 10 is a hexagonal head bolt. The bolt is made of high-strength alloy steel and has been galvanized. A spring washer is provided on the contact surface between the bolt and the heat-conducting plate 61.

[0045] In an optional embodiment: the bottom of the cover 2 is symmetrically provided with four sets of countersunk holes, and a first bolt 9 is installed inside the countersunk hole. One end of the first bolt 9 passes through the countersunk hole and is threaded into the inside of the protective shell 1.

[0046] It should be noted that the countersunk hole matches the head size of the first bolt 9, ensuring that the bolt head is flush with the bottom surface of the cover 2 after installation; the protective shell 1 has an internal threaded hole corresponding to the position of the first bolt 9, and the thread accuracy matches that of the bolt.

[0047] The countersunk hole design ensures that the first bolt 9 will not protrude from the bottom surface of the cover 2 after installation, avoiding interference of the bolt head with the external structure, and making the cover 2 look flatter and more aesthetically pleasing.

[0048] Working principle: When this utility model is in use, the anti-interference shell 62 and the abutment shell plate 63 cooperate to form a closed shielding space, which completely wraps the circuit board 4 and the bottom connection end of the camera 5, directly blocking external electromagnetic interference from entering the core component area. The protective sleeve 3 protects the top outer wall of the camera 5.

[0049] The protective sleeve 3, heat-conducting plate 61, anti-interference shell 62 and abutment shell 63 are made of carbonyl iron particle composite thermal conductive and wave-absorbing material. This material can actively absorb electromagnetic interference in the frequency range of 100MHz-10GHz, convert electromagnetic energy into heat energy, which weakens external interference and suppresses the electromagnetic radiation generated by the internal components themselves, thus preventing interference from spreading.

[0050] The heat generated by the circuit board 4 and camera 5 is quickly transferred to the heat dissipation fins 65 through the heat conduction plate 61. The pure copper heat dissipation fins increase the heat dissipation area and accelerate the transfer of heat to the air inside the protective shell 1. The symmetrical matrix ventilation holes 8 on the side wall of the protective shell 1 form a convection air duct. External cold air enters the shell, takes away the heat emitted by the fins, and is discharged from the ventilation hole 8 on the other side, thus achieving continuous heat dissipation.

[0051] 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. A camera module anti-electromagnetic interference structure, characterized in that, include: The protective shell (1) has a detachable cover (2) at the bottom and a protective sleeve (3) installed through the top; The circuit board (4) is installed inside the protective shell (1), and a camera (5) is fixedly installed at the top center. The top of the camera (5) extends through the protective sleeve (3) to the top of the protective sleeve (3). An anti-electromagnetic mechanism (6) is installed inside the protective shell (1) to improve the electromagnetic interference resistance of the camera (5); The anti-electromagnetic mechanism (6) includes a heat-conducting plate (61), which is detachably installed on the inner wall of the protective shell (1). The circuit board (4) is fixedly installed at the top center of the heat-conducting plate (61). An anti-interference shell (62) is fixedly installed on the outside of the heat-conducting plate (61) and the circuit board (4). The anti-interference shell (62) has a cylindrical structure with open ends, which can completely wrap the circuit board (4) and the bottom connection end of the camera (5). An abutting shell plate (63) that cooperates with the anti-interference shell (62) is fixedly installed on the inner top of the protective shell (1). It cooperates with the anti-interference shell (62) to form a closed shielding space, which completely encloses the bottom connection end of the circuit board (4) and the camera (5) in the shielding space to block the propagation path of electromagnetic interference. 2.The camera module anti-electromagnetic interference structure of claim 1, wherein: The bottom of the abutting shell plate (63) is provided with an abutting groove (64), and the top of the anti-interference shell (62) is inserted into the interior of the abutting groove (64).

3. The anti-electromagnetic interference structure for a camera module according to claim 1, characterized in that: The protective sleeve (3), heat-conducting plate (61), anti-interference shell (62) and abutment shell (63) are all made of heat-conducting and wave-absorbing material, which is a composite of carbonyl iron particles, heat-conducting silicone and glass fiber cloth. 4.The camera module anti-electromagnetic interference structure of claim 1, wherein: The distance between the inner wall of the anti-interference housing (62) and the edge of the circuit board (4) is 2-5mm, and its height is higher than the maximum height of the electronic components on the circuit board (4). 5.The camera module anti-electromagnetic interference structure of claim 1, wherein: The bottom of the heat-conducting plate (61) is fixedly equipped with several sets of heat dissipation fins (65) at equal intervals. The protective shell (1) has several sets of ventilation holes (8) on its side wall, and a dustproof net is fixedly installed inside the ventilation holes (8). 6.The camera module anti-electromagnetic interference structure of claim 1, wherein: Fixing blocks (7) are fixedly installed at the four corners of the inner wall of the protective shell (1), and second bolts (10) are installed between the top of the heat-conducting plate (61) and the bottom of the four sets of fixing blocks (7). 7.The camera module anti-electromagnetic interference structure of claim 1, wherein: The bottom of the shell cover (2) is symmetrically provided with four sets of countersunk holes. The first bolt (9) is installed inside the countersunk hole. One end of the first bolt (9) passes through the countersunk hole and is threaded into the inside of the protective shell (1).

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