Plastic shell vehicle camera module

Abstract

The present invention relates to a plastic shell vehicle-mounted camera module, comprising a lens assembly (1), an imaging module (2), an outer shell (3), a heat-conducting assembly (4) and an external connector (5), and also comprising a heat-dissipating shield (6), the outer contour of which has a protruding portion and a concave avoiding portion. The outer shell is formed by molding a plastic material, and the heat-dissipating shield is made of metal with good thermal conductivity. The heat-dissipating shield is connected to the camera module through a grounding contact point to be grounded and shielded. According to the space of the outer shell accommodating cavity, the volume of the heat-dissipating shield is maximized, and the lower part and the periphery of the imaging module are surrounded. A heat-conducting assembly is fixedly arranged between the circuit board and the heat-dissipating shield, so that the heat of the heating part is transferred to the heat-dissipating shield through the heat-conducting assembly, and the temperature of the heating element is effectively reduced through the heat radiation effect between the circuit board and the heat-dissipating shield. The present invention effectively solves the heat dissipation and shielding problems of the plastic shell camera module when the power consumption is high.

Description

Technical Field

[0001] The present invention relates to the technical field of cameras, and in particular to a vehicle-mounted camera module with a plastic shell. Background Art

[0002] With the development trend of automobile intelligence, cameras are playing an increasingly important role in the automotive field; as people's awareness of driving safety protection continues to increase, drivers need to constantly watch the blind spots around the car body and road conditions, and the number of on-board cameras installed on vehicles continues to increase. At present, cameras are mainly used in cars for reversing images (rear view) and 360-degree panoramic views (surround view). Various auxiliary equipment of high-end cars can be equipped with up to 8 cameras to assist drivers in parking or trigger emergency braking. When cameras successfully replace side mirrors, the number of cameras on cars will reach 12. For the in-vehicle environment, cameras with plastic shells have many advantages. The high-strength all-plastic shell is light in weight, durable, waterproof, flame-retardant, impact-resistant, and heat-resistant. It is a good insulator to protect users from electrical damage. In addition, the high-strength plastic shell has very stable properties and can play a relatively stable protective role regardless of high or low temperature environments. The plastic shell has strong corrosion resistance and does not react with acids or alkalis. The molding and processing technology of plastics is very mature, the production cycle of plastic shells is short and the manufacturing cost is low, and it is easy to be molded into special-shaped surface shapes.

[0003] For vehicle-mounted camera modules, being able to shield interference from electromagnetic signals from various electronic devices in the car and being able to quickly reduce the temperature of the imaging circuit board due to operation are important factors in improving camera quality and extending service life. In addition, the vehicle-mounted camera housing also needs to be corrosion-resistant, have stable performance in high and low temperature environments, have high sealing performance requirements, and have a waterproof effect.

[0004] In order to solve the signal shielding and heat dissipation problems of the plastic shell vehicle camera module, the Chinese invention patent CN109474778A specification discloses a plastic laser front shell penetration welding vehicle camera, which includes a front shell, a rear shell, a first substrate, and a second substrate. The front shell and the rear shell are all made of plastic. A front convex lens is fixedly arranged at the front end of the front shell. An inner groove is arranged at the periphery of the rear end surface of the side convex end of the front shell for positioning the rear shell. The front end surface of the side convex end corresponding to the inner groove is a plane. The part of the rear shell facing the inner groove is a convex positioning. The first substrate is fixedly mounted on the front shell. On the rear end substrate mounting part, the second substrate is fixedly mounted on the corresponding substrate mounting part of the rear shell, the first rear end connecting part of the first substrate is connected to the front end slot of the second substrate, the protrusion of the rear shell is positioned and embedded in the inner groove of the front shell, and is connected by laser penetration welding to form a closed weld, the first substrate, the first rear end connecting part, the second substrate, and the front end slot are located in the installation cavity after the rear shell covers the front shell, and the inner wall surface of the front shell and the rear shell corresponding to the surface area where the installation cavity is located is covered with a metal layer, and the metal layer is specifically coated on the corresponding inner walls of the front shell and the rear shell by sputtering.

[0005] The camera with a plastic shell disclosed in the specification of CN 109474778 A can shield interference signals, but its metal layer is sputtered and its thickness is not enough to achieve a good heat dissipation effect, so that the temperature of the camera circuit board is too high, which causes the electronic components to age easily, thereby reducing the imaging quality of the camera; the shell is an integral welded structure, and although it has good sealing, if the internal parts of the camera are damaged, the shell cannot be easily disassembled for repair. Summary of the invention

[0006] In view of the above-mentioned defects in the prior art, the purpose of the present invention is to provide a plastic shell vehicle-mounted camera module, which can shield the electromagnetic signals of various electronic equipment in the vehicle and quickly and massively absorb the heat generated by the high-power electronic components on the imaging circuit board due to operation, thereby reducing the temperature of the imaging circuit board and the high-power electronic components.

[0007] To solve the above technical problems, the present invention provides a plastic shell vehicle-mounted camera module, comprising a lens assembly, an imaging module, an outer shell, a heat-conducting assembly and an external connector, and further comprising a heat dissipation shielding component, the outer contour of which has a protruding portion and a concave avoidance portion.

[0008] The outer shell includes a front cover and a rear cover, which are made of high-strength plastic materials. The high-strength all-plastic shell is light in weight, durable, waterproof, flame-retardant, impact-resistant, and heat-resistant. It is a good insulator and can protect users from electrical damage. In addition, the high-strength plastic shell has very stable properties and can provide relatively stable protection regardless of high or low temperature environments. The plastic shell has strong corrosion resistance and does not react with acids or alkalis. The molding process of plastics is very mature, the production cycle of plastic shells is short, the manufacturing cost is low, and it is easy to be molded into special-shaped surface shapes.

[0009] Anti-interference is a key factor in vehicle-mounted camera module technology, firstly because cables may become antennas inside the vehicle, which may produce harmful results. The surge in electrical and electronic systems in vehicles requires these systems to have good internal shielding and external shielding so that the various electronic systems in the vehicle can coexist in a compatible manner. A grounding contact point is provided in the above-mentioned plastic shell vehicle-mounted camera module, and the heat dissipation shield is connected to the camera module and grounded through the grounding contact point. Since the heat dissipation shield is made of metal material and it surrounds the bottom and periphery of the imaging module, it can provide good shielding for the camera module and act as an electrostatic conduction path, which can effectively prevent blurred imaging and noise during imaging, thereby improving the compatibility of the vehicle-mounted camera module.

[0010] The front cover and the rear cover are fixedly sealed and connected and jointly define a housing cavity, in which the camera module is accommodated, and the external connector is electrically connected to the camera module, and the external connector extends from the rear cover; the cover wall of the front cover partially faces outward and forms a mounting sleeve for the lens assembly, and the lens assembly is inserted into the mounting sleeve and connected thereto.

[0011] Furthermore, the cover wall of the rear cover is provided with a through hole, and the edge of the through hole cooperates with the external connector; the mounting sleeve is a cylinder that protrudes outward from the bottom wall of the front cover, the mounting sleeve is provided with an internal thread, and the outer surface of the lens assembly is provided with an external thread, and the lens assembly is threadedly connected to the mounting sleeve; the mounting sleeve and the front cover are an integral structure, and are made of plastic material and the front cover are integrally molded, which is conducive to sealing; or the mounting sleeve and the front cover are separate structures.

[0012] The mounting sleeve provided on the front cover needs to be connected to the interior of the accommodating cavity so that light can pass through the lens of the lens to reach the photosensitive element of the imaging module.

[0013] The respective ends of the front cover and the rear cover should be able to match each other, one matching end is provided with a circle of convex ribs, and the other matching end is provided with a circle of grooves, and the convex ribs are plugged into the grooves; the outer shell also includes a sealing ring arranged in the grooves and abutting against the convex ribs; the detachable connection between the front cover and the rear cover is convenient for subsequent maintenance work, and the installation method of the convex ribs, the grooves and the sealing rings ensures the sealing of the outer shell, which is waterproof and dustproof. In addition, sealant is applied between the through holes of the rear cover and the external connector, and sealant is applied between the lens assembly and the mounting sleeve after the threaded connection. If the mounting sleeve and the front cover are separate structures, sealant is also required to be applied at the connection parts, so that the overall outer shell has good waterproof performance, and the vehicle-mounted camera module will not be damaged by water during rain or car washing.

[0014] The imaging module in the above-mentioned plastic shell vehicle-mounted camera module includes: an imaging circuit board group, a photosensitive element, and the imaging circuit board group can be composed of at least one PCBA circuit board, and the PCBA circuit boards are electrically connected to each other, and the electrical connection method is an internal connector electrical connection or an electrical connection using a flexible circuit board, and the photosensitive element is close to the PCBA circuit board of the lens assembly. The imaging module using a high-definition wide-angle lens or composed of two or more PCBA circuit boards can improve the clarity and imaging quality of the vehicle-mounted camera, and the picture is clear.

[0015] Furthermore, the imaging circuit board group includes an ISP chip and / or a VP chip. ISP, which is the abbreviation of "Image Signal Processor", is a unit used to process the output signal of the front-end image sensor. Its application makes the effect of seeing digital images as close as possible to the effect of seeing real scenes by human eyes. After the lens projects the light signal to the photosensitive area of ​​the circuit board, the sensor undergoes photoelectric conversion and sends the original image in Bayer color format to the ISP. After algorithm processing, the ISP outputs the image in the RGB color mode space domain to the back-end video acquisition unit. In this process, the ISP controls the ISP logic through the firmware running on it, thereby controlling the lens and sensor accordingly, and then completing functions such as automatic aperture, automatic exposure, and automatic white balance. Artificial intelligence technology has entered the imaging industry as a new factor of technological change, bringing more challenges to image processing and calculation. Now, in addition to ISP chips, high-end high-definition cameras will add visual processor (VP) chips with AI capabilities.

[0016] In the above-mentioned plastic shell vehicle-mounted camera module, since the front cover and the rear cover are both formed of plastic materials, a positioning seat with a protrusion or groove for fixing or limiting the camera module can be conveniently provided on the inner surface of the front cover or the rear cover, and the imaging circuit board group is fixedly connected to the front cover or the rear cover through the positioning seat. The positioning seat can be an integral structure with the front cover or the rear cover, or it can be a positioning column or a pressure riveted rivet column fixedly installed on the front cover or the rear cover. The fixed connection method can be a positioning screw, a hook or a slot connection.

[0017] The bottom surface shape of the heat dissipation shielding part matches the inner surface shape of the bottom wall of the rear cover, and a through hole matching the outer connector shape is set on the heat dissipation shielding part. The outer connector extends out of the rear cover through the through hole, and the outer connector connects the cable to transmit the signal to the visual output device in the car. In order to make the electronic circuit technology work better, it is necessary to select high-performance and high-adaptability electrical connectors to ensure its noise resistance and excellent environmental resistance such as high waterproofness. The heat dissipation shielding part is tightly and seamlessly fixed to the inner surface of the bottom wall of the rear cover, and the fixing method is, for example, screw or rivet column fixing. If it is fixed by rivet column, the riveting part is fixed to the rear cover as a whole; if it is fixed by screw, the screw column and the rear cover are detachably fixed as a whole. In the range where the heat dissipation shielding part is parallel to the substrate of the circuit board close to the rear cover in the imaging circuit board group and has an equal area, the heat dissipation shielding part is provided with multiple concave avoidance parts on the top surface away from the rear cover. The size and shape of the concave avoidance part match the convex shape formed by the electronic components installed on the side of the circuit board close to the rear cover in the imaging circuit board group.

[0018] A spacing gap A is provided between the concave avoidance portion of the heat dissipation shield and the convex portion of the imaging module. The existence of this gap can protect the components on the circuit board from being squeezed and damaged, and at the same time, the heat generated by the circuit board is conducted to the air layer in the gap in the form of thermal radiation, which is a way to dissipate heat from the heat-generating circuit board.

[0019] The side surface shape of the heat dissipation shield matches the inner surface shape of the four walls of the accommodating cavity. There is a side gap B between the circuit board of the camera module near the rear cover and the inner surface of the inner wall of the accommodating cavity. The top surface of the heat dissipation shield within the gap range extends toward the inner surface direction of the bottom wall of the front cover, and a top gap C is set between the inner surface of the bottom wall of the front cover. The side gap B is defined by the outer dimensions of the accommodating cavity of the outer shell and the circuit board, ensuring that there is no installation interference between the outer shell and the accommodating cavity. The heat dissipation shield at the side gap B forms a continuous structure that surrounds all electronic components of the camera module, ensuring the shielding effect, protecting the electronic circuits of the car, and playing a better role in anti-interference and anti-radiation. In the vehicle-mounted camera module according to the present invention, the shape of the heat dissipation shield changes with the change of the outer contour of the imaging module that generates heat, and the gap between the two is always kept constant, and the heat dissipation shield is as close as possible and surrounded by the heating circuit board. The effect produced by this, which is different from the prior art, is that the thickness of the heat dissipation shield itself is increased, so that the volume of the heat dissipation shield in the accommodating cavity is maximized. The maximization of the volume is conducive to the heat dissipation shield to absorb and store heat. This is another main heat dissipation method for the imaging module that generates heat in the vehicle-mounted camera module according to the present invention.

[0020] As is known to all, when the temperature of electronic components is high, if the components cannot be cooled, extremely high temperatures will be generated, thus causing electron migration. Electron migration is when electrons flow at high speed, causing metal atoms to migrate. Electron migration is a slow process that damages circuit boards and chips. Once line damage occurs, the situation will become more and more serious, and will eventually cause the entire circuit to short-circuit. The high temperature generated by the short-circuit circuit can even cause the entire electronic component to burn, explode, and other phenomena, posing a great hazard to the safety of people and buildings. The heat dissipation shielding component of the vehicle-mounted camera module of the present invention can conduct the heat in the heat-generating electronic components on the circuit board of the imaging module to the greatest extent, effectively and quickly reducing the temperature of the heated circuit board, improving the imaging quality, enhancing reliability, and eliminating potential safety hazards during vehicle driving.

[0021] The heat dissipation shield is made of a metal with good thermal conductivity.

[0022] Further, the heat dissipation shield is made of a metallic material iron alloy having good thermal conductivity.

[0023] Furthermore, the heat dissipation shield is made of aluminum or aluminum alloy, a metal material with good thermal conductivity.

[0024] Furthermore, the heat dissipation shield is made of copper or copper alloy, a metal material with good thermal conductivity.

[0025] In order to conduct the heat more effectively, a heat-conducting component is fixedly arranged between the imaging circuit board group and the heat dissipation shield, and the heat-conducting component includes at least one heat-conducting pad, which is flat and preferably made of elastic material. The large-area surface of the heat-conducting pad is attached to the circuit board in the imaging circuit board group close to the rear cover, and the other large-area surface is attached to one end surface of the heat dissipation shield. The end surface of the imaging circuit board group connected to the heat-conducting component is a planar shape that forms a surface contact with the heat-conducting component, and is a shape that matches the heat-conducting component. The end surface of the heat dissipation shield connected to the heat-conducting component is a planar shape that forms a surface contact with the heat-conducting component, and is a shape that matches the heat-conducting component.

[0026] The heat conduction component is made of heat conduction material to form a heat conduction path between the heat generating circuit board and the heat dissipation shielding component.

[0027] Furthermore, the heat-conducting component is made of silicone rubber produced by chemical changes between liquid silicone and solid silicone.

[0028] Furthermore, the heat conducting component is made of rubber.

[0029] An insulating layer may be provided on the surface of the heat dissipation shielding member to prevent leakage and protect the safety of people in the vehicle.

[0030] Furthermore, the surface of the heat dissipation shield is subjected to electroplating treatment and / or treatment to prevent chemical corrosion.

[0031] In summary, the present invention has the following beneficial effects: According to the concept of the present invention, the volume of the heat dissipation shield is made as large as possible in the camera module accommodating cavity. The heat in the surrounding environment is absorbed and contained in the heat dissipation shield by utilizing the volume of the heat dissipation shield itself. With the largest possible volume, the heat dissipation shield can be placed as close as possible to the corresponding part of the imaging module, thereby quickly absorbing a large amount of heat from the imaging module. With the largest possible volume, more heat can be absorbed and stored, thereby more effectively reducing the temperature of the imaging module.

[0032] According to the concept of the present invention, the outer contour shape of the corresponding part of the heat dissipation shield and the imaging module is designed to change with the change of the protrusion or depression of the side of the PCBA circuit board near the back cover in the imaging module. When the height of the electronic component protruding from the circuit board is high, the corresponding part of the heat dissipation shield corresponding to it will be recessed into it. The depth of the depression corresponds to the protruding height of the corresponding electronic component. In particular, according to the concept of the present invention, no matter how much the electronic component protrudes from the circuit board, and no matter how much the corresponding part of the heat dissipation shield is recessed, the distance between the opposite surfaces or parts of the two remains constant. Therefore, no matter what height or length of the electronic component that generates heat during work is set on the circuit board, the heat dissipation shield can equally absorb the heat on the imaging module and cool it down in time.

[0033] According to the concept of the present invention, the volume of the heat dissipation shield is maximized in a fixed space by utilizing the surface changes of the heat dissipation shield that follow the protrusions or depressions of the imaging module, thereby absorbing the heat in the imaging module as quickly and as much as possible by utilizing thermal radiation in the non-contact area between the heat dissipation shield and the circuit board.

[0034] According to the concept of the present invention, the outer contour of the heat dissipation shielding member changes according to the specific shape of the camera module accommodating cavity, and is not fixed. The change principle of the change is to make the outer contour of the heat dissipation shielding member change with the arrangement of the electronic components on the circuit board; the quantitative principle of the change is to keep the distance between the outer contour of the heat dissipation shielding member and the electronic components arranged on the circuit board constant. For the vehicle-mounted camera module, it is particularly advantageous to maintain the spacing at 2-5 mm. This spacing can absorb heat as quickly as possible without causing adverse effects on the electronic components on the imaging circuit board group of the imaging module. The length of the large-volume metal heat dissipation shielding member according to the present invention can cover the length of the entire camera module, and can effectively shield the interference of electromagnetic signals of various other electronic devices in the car; the electronic components of the imaging module will generate a lot of heat in the high energy consumption state, so that the system temperature of the whole machine is very high. The high temperature environment is easy to cause the electronic components in the camera to age and be damaged. The imaging of the camera also has the problem of thermal noise and blurred imaging. The maximization of the volume of the heat dissipation shielding member can quickly reduce the temperature of the imaging circuit board generated by the work, improve the imaging performance, extend the service life and reduce the safety risk factor.

[0035] The shell made of high-strength engineering plastic is impact-resistant, and the plastic shell of the car camera is also corrosion-resistant and has stable performance in high and low temperature environments; the plastic shell of the present invention is detachable and has high sealing performance, and has a waterproof effect; the external connections of the present invention adopt the following three waterproof methods: one is structural waterproof; the second is sealing ring waterproof; the third is waterproof using sealant. Good sealing effectively avoids the problem of short circuit of the car camera module or blur of the camera after washing the car or on rainy days.

[0036] By clearly understanding the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the following specific implementation method is used in conjunction with the accompanying drawings for detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 The figure is a schematic structural diagram of an embodiment of a plastic shell vehicle-mounted camera module of the present invention.

[0038] Figure 2 For along Figure 1 A schematic diagram of the structure viewed from above along the AA section line is shown.

[0039] Figure 3 The figure is a schematic structural diagram of another embodiment of the plastic shell vehicle-mounted camera module of the present invention.

[0040] Figure 4 For along Figure 3 A schematic diagram of the structure viewed from above along the BB section line is shown.

[0041] The meanings of the numbers in the figure are: 1-lens assembly; 2-imaging module; 21-imaging circuit board group; 211-single PCBA circuit board; 212-dual PCBA circuit board one; 213-dual PCBA circuit board two; 22-photosensitive element; 23-inner connector; 3-outer shell; 31-front cover; 32-back cover; 33-sealing ring; 34-positioning seat; 35-pressure riveting column; 36-positioning screw; 37-mounting sleeve; 4-thermal conductive component; 41-thermal conductive pad; 5-external connector; 6-heat dissipation shield. DETAILED DESCRIPTION

[0042] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the invention are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without creative work.

[0043] When describing the embodiments of the present invention, the orientation or positional relationship expressed by the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or positional relationship shown in the relevant drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0044] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments cannot be described one by one here, but the embodiments of the present invention are not therefore limited to the following embodiments.

[0045] Figure 1 A structural schematic diagram showing an embodiment of a plastic housing vehicle-mounted camera module according to the present invention is shown in FIG. Figure 1 The plastic shell vehicle camera module shown includes a lens assembly 1, an imaging module 2, a shell 3, a heat conducting assembly 4, an external connector 5 and a heat dissipation shield 6, and the outer contour of the heat dissipation shield 6 has a protruding portion and a concave avoidance portion. The shell 3 includes: a front cover 31 and a rear cover 32, and the front cover 31 and the rear cover 32 are made of plastic material. The imaging module 2 includes: an imaging circuit board group 21, a photosensitive element 22, and the imaging circuit board group 21 is a single PCBA circuit board 211, and the photosensitive element 22 is fixed to the single PCBA circuit board 211. The single PCBA circuit board 211 is formed by integrating and assembling various electronic components required for camera on a printed circuit board PCB through a surface packaging process. The single PCBA circuit board 211 integrates other required electronic modules such as an image information processing module, an image sensing module, and a power supply module, that is, the functions of the original signal board and the power control board are integrated into one, which reduces the total power consumption and saves the space occupied by the circuit board, which is conducive to the miniaturization of the vehicle camera module.

[0046] In this embodiment, the imaging module 2 is provided with a grounding contact point, and the heat dissipation shielding member 6 is connected to the imaging module 2 and grounded through the grounding contact point to play the role of electromagnetic shielding and serving as an electrostatic conduction path.

[0047] In this embodiment, the front cover 31 and the rear cover 32 are fixedly sealed and connected and jointly define a rectangular accommodating cavity. The external connector 5 extends from the rear wall of the rear cover. The cover wall of the front cover 31 is partially outward and forms a mounting sleeve 37 for the lens assembly. The mounting sleeve 37 is integrally formed with the front cover 31.

[0048] The single PCBA circuit board 211 is fixedly accommodated in the accommodating cavity; the external connector 5 is electrically connected to the single PCBA circuit board 211, and its terminals extend into the accommodating cavity to be electrically connected to the terminal seat on the single PCBA circuit board 211. The cover wall of the rear cover 32 is provided with a circular through hole, and the edge of the through hole cooperates with the external connector 5.

[0049] The mounting sleeve 37 is a cylinder that protrudes outward from a part of the bottom wall of the front cover 31. The mounting sleeve 37 needs to be connected to the inside of the accommodating cavity. The mounting sleeve 37 is provided with a fine internal thread, and the outer surface of the lens assembly 1 is provided with a fine external thread. The lens assembly 1 is installed in the mounting sleeve 37 with the fine thread and is detachably connected to it. The mounting sleeve 37 and the front cover 1 are an integrated structure.

[0050] The respective ends of the front cover 31 and the rear cover 32 should be able to match each other. The matching rectangular end of the front cover 31 is provided with a circle of linear convex ribs, and the matching rectangular end of the rear cover 32 is provided with a circle of linear grooves. The linear convex ribs and the linear grooves are plugged and matched; the matching should be a transition or interference fit, so that the connection between the front cover 31 and the rear cover 32 has a certain strength; the outer shell 3 may also include a silicone seal ring 33 provided on the linear groove and abutting against the linear convex ribs. The front cover 31 and the rear cover 32 are further fastened with screws at the rectangular right angle to enhance the strength of the outer shell and increase the deformation of the silicone seal ring to obtain better sealing. Sealant is applied between the through hole of the rear cover 32 and the external connector 5, and sealant is applied between the lens assembly 1 and the mounting sleeve 37.

[0051] The inner surface of the front wall of the front cover 31 is provided with a positioning seat 34, and a screw hole is provided in the positioning seat 34. The single PCBA circuit board 211 is fixed to the positioning seat 34 by screws to be fixedly connected with the front cover 31. The heat dissipation shielding member 6 is tightly fixedly connected to the inner surface of the bottom wall of the rear cover 32 by screws without gaps. The bottom surface shape of the heat dissipation shielding member 6 matches the inner surface shape of the bottom wall of the rear cover 32, and the through hole of the heat dissipation shielding member 6 is the same as the through hole of the rear cover 32 in diameter, and the axes of the two holes are coaxially arranged.

[0052] In the range where the heat dissipation shield 6 is parallel to and equal in area to the substrate of the single PCBA circuit board 211, the heat dissipation shield 6 is provided with a plurality of concave avoidance portions on the top surface away from the rear cover 32, and the size and shape of the concave avoidance portions match the convex shape formed by the electronic components installed on the side of the single PCBA circuit board 211 close to the rear cover.

[0053] A spacing gap A is provided between the concave avoidance portion of the heat dissipation shielding member 6 away from the side of the rear cover 32 and the convex portion of the side of the single PCBA circuit board 211 close to the rear cover 32 .

[0054] The side surface shape of the heat dissipation shield 6 matches the inner surface shape of the four walls of the rectangular accommodation cavity. There is a side gap B between the single PCBA circuit board 211 and the inner surface of the inner wall of the accommodation cavity. The top surface of the heat dissipation shield 6 within the range of the side gap B extends toward the inner surface direction of the bottom wall of the front cover 31, and a top gap C is set between the inner surface of the bottom wall of the front cover 31. The side gap B is defined by the outer dimensions of the rectangular accommodation cavity of the outer shell 3 and the single PCBA circuit board 211. In the imaging module 2 according to the present invention, the outer shape of the heat dissipation shield 6 changes with the change of the outer contour of the single PCBA circuit board 211, and the gap between the two is always kept constant, so that the heat dissipation shield 6 is as close as possible and surrounded by the single PCBA circuit board 211. In addition, the single PCBA circuit board 211 is installed on the front cover 31, so that the volume of the heat dissipation shield 6 in the rectangular accommodation cavity is maximized. The maximized volume is conducive to the heat dissipation shield 6 to absorb and store heat. This is another main heat dissipation path for the heat-generating electronic components in the imaging module 2 according to the present invention.

[0055] The heat dissipation shield 6 is made of metal having good thermal conductivity.

[0056] Taking into account the thermal conductivity, price and processing cost of metal materials, the heat dissipation shielding member 6 of this embodiment is made of aluminum alloy, a metal material with good thermal conductivity.

[0057] In order to conduct heat more effectively, a thermal pad 41 is fixedly arranged between the single PCBA circuit board 211 and the heat dissipation shield 6. The thermal pad 41 is a flat square and is preferably made of silicone. A large surface of the thermal pad 41 is attached to the single PCBA circuit board 211, and another large surface is attached to one end surface of the heat dissipation shield 6.

[0058] The surface where the single PCBA circuit board 211 fits with the thermal pad 41 is a square plane without printed circuit lines, and the size of the square plane is the same as the size of the large surface of the thermal pad 41. The end surface of the heat dissipation shield 6 that fits with the thermal pad 41 is a square plane that forms surface contact with the thermal pad 41, and the size of the square plane is the same as the size of the large surface of the thermal pad 41.

[0059] The thermal pad 41 is made of elastic silicone material and has a thickness greater than the spacing gap A between the single PCBA circuit board 211 near the rear cover 31 and the heat dissipation shielding member 6 .

[0060] An insulating layer may be provided on the surface of the heat dissipation shielding member 6 to prevent leakage and protect the safety of the people in the vehicle.

[0061] Figure 3 A structural schematic diagram showing another embodiment of a plastic housing vehicle-mounted camera module according to the present invention is shown in FIG. Figure 3The plastic shell vehicle-mounted camera module shown includes a lens assembly 1, an imaging module 2, an outer shell 3, a heat-conducting assembly 4, an external connector 5 and a heat-dissipating shield 6. The outer contour of the heat-dissipating shield 6 has a protruding portion and a concave avoidance portion. The outer shell 3 includes: a front cover 31 and a rear cover 32. The front cover 31 and the rear cover 32 are made of high-strength engineering plastic materials. The imaging module 2 includes: an imaging circuit board group 21 and a photosensitive element 22. The imaging circuit board group 21 is two PCBA circuit boards, which are a double PCBA circuit board 1 212 and a double PCBA circuit board 2 213, to achieve high-definition photography of the vehicle-mounted camera module. The photosensitive element is fixed to each PCBA circuit board. The two PCBA circuit boards are electrically connected with an internal connector.

[0062] In this embodiment, the camera module 2 is provided with a grounding contact point, and the screw positioning hole areas of the two imaging PCBA circuit boards are respectively provided with exposed copper grounding planes. The heat dissipation shielding member 6 is connected to the camera module 2 through the grounding contact point to be grounded, so as to play the role of electromagnetic shielding and as an electrostatic conduction path. When the air is discharged, the electrostatic discharge path is from the metal shielding member 6 to the imaging circuit board group 21 to the male and female sockets of the external connector 5 to the harness shielding layer, and finally released to the vehicle body and to the ground.

[0063] In this embodiment, the front cover 31 and the rear cover 32 are fixedly sealed and connected and jointly define a rectangular accommodating cavity. The cover wall of the front cover 31 is partially outward and forms a mounting sleeve 37 of the lens assembly. The mounting sleeve 37 is a cylindrical structure. The mounting sleeve 37 and the mounting seat of the lens mounting sleeve 37 of the front cover 31 are detachably installed in a threaded connection. The mounting sleeve 37 is made of high-strength engineering plastic.

[0064] The mounting sleeve 37 needs to be connected to the interior of the accommodating cavity. The mounting sleeve 37 is provided with a fine internal thread. The outer surface of the lens assembly 1 is provided with a fine external thread. The lens assembly 1 is installed in the mounting sleeve 37 with the fine thread and is detachably connected to it. The mounting sleeve 37 and the front cover 31 are separate structures.

[0065] The imaging circuit board group 21 is fixedly accommodated in the accommodating cavity; the external connector 5 extends from the rear wall of the rear cover, and the external connector 5 is electrically connected to the second dual PCBA circuit board 213, and its terminals extend into the accommodating cavity to be electrically connected to the terminal seat on the second dual PCBA circuit board 213. The cover wall of the rear cover 32 is provided with a circular through hole, and the edge of the through hole cooperates with the external connector 5.

[0066] The respective ends of the front cover 31 and the rear cover 32 should be able to match each other. The matching circular end of the front cover 31 is provided with a circular rib around the periphery, and the matching circular end of the rear cover 32 is provided with a circular groove around the periphery. The linear rib is plugged into the linear groove and matched, and its cross section is rectangular. The matching should be a transition or interference fit, so that the connection between the front cover 31 and the rear cover 32 has a certain strength. The outer shell 3 may also include a silicone seal ring 33 provided on the linear groove and abutting against the linear rib. The front cover 31 and the rear cover 32 are further fastened with screws at the circular outer ring to enhance the strength of the outer shell and increase the deformation of the silicone seal ring 33 to obtain better sealing. Sealant is applied between the through hole of the rear cover 32 and the external connector 5, between the lens assembly 1 and the mounting sleeve 37, and between the mounting sleeve mounting seat of the front cover 31 and the mounting sleeve 37.

[0067] Two riveting columns 35 are arranged at both ends of the inner surface of the rear wall of the rear cover 32, and the dual PCBA circuit board 213 is fixedly connected to the rear cover 32 through the riveting columns 35. The two circuit boards are reliably connected by a pin-and-socket type internal connector. The dual PCBA circuit board 212 is placed on the side close to the front cover, and the pins and sockets of the internal connector 23 are machined from an elastic copper alloy material with good electrical conductivity, and the surface is silver-plated and gold-plated to achieve low contact resistance and corrosion resistance. The outer shell of the internal connector 23 used is added with a shielding ring to ensure 360° electromagnetic interference shielding capability. The height of the riveting columns 35 determines the average thickness of the heat dissipation shielding component 6, so the riveting columns 35 try to raise the circuit board in the accommodating cavity and ensure that the dual PCBA circuit board 212 does not interfere with the inner wall of the front cover 31.

[0068] The heat dissipation shielding member 6 is tightly and gaplessly fixed to the inner surface of the bottom wall of the rear cover 32 by rivets, the bottom surface shape of the heat dissipation shielding member 6 matches the inner surface shape of the bottom wall of the rear cover 32, and the through hole of the heat dissipation shielding member 6 is aligned with the through hole of the rear cover 32 in diameter, and the axes of the two holes are coaxially arranged.

[0069] In the range where the heat dissipation shielding member 6 is parallel to and equal in area to the substrate of the second dual PCBA circuit board 213, the heat dissipation shielding member 6 is provided with multiple concave avoidance portions on the top surface away from the rear cover 32. The size and shape of the concave avoidance portions match the convex shape formed by the electronic components installed on the side of the second dual PCBA circuit board 213 close to the rear cover 32.

[0070] A spacing gap A is provided between the concave avoidance portion of the heat dissipation shielding member 6 away from the side surface of the rear cover 32 and the convex portion of the side surface of the second double PCBA circuit board 213 close to the rear cover.

[0071] The side surface shape of the heat dissipation shield 6 matches the inner surface shape of the four walls of the rectangular accommodating cavity. There is a side gap B between the imaging circuit board group 21 and the inner surface of the rectangular inner wall of the accommodating cavity. The top surface of the heat dissipation shield 6 within the range of the side gap B extends toward the inner surface direction of the wall of the front cover bottom 31, and a top gap C is set between the inner surface of the bottom wall of the front cover 31. The side gap B is defined by the outer dimensions of the rectangular accommodating cavity of the outer shell 3 and the imaging circuit board group 21. In the vehicle-mounted camera module according to the present invention, the outer shape of the heat dissipation shield 6 changes with the change of the outer contour of the imaging circuit board group 21, and the gap between the two is always kept constant, so that the heat dissipation shield 6 is as close as possible to the imaging circuit board group 21 in an enclosing manner. Although the imaging circuit board group 21 is installed on the back cover 32, the heat dissipation shield 6 is maximized in the rectangular accommodating cavity as much as possible. The maximization of the volume is conducive to the heat dissipation shield 6 to absorb and store heat. This is another main heat dissipation path for the electronic components that generate heat in the vehicle-mounted camera module according to the present invention.

[0072] The heat dissipation shield 6 is made of metal having good thermal conductivity.

[0073] Taking into account the thermal conductivity, price and processing cost of metal materials, the heat dissipation shield 6 of this embodiment is made of copper alloy, a metal material with good thermal conductivity.

[0074] In order to conduct the heat more effectively, a thermal pad 41 is fixedly arranged between the second dual PCBA circuit board 213 and the heat dissipation shield 6. The thermal pad 41 is flat and round and is preferably made of rubber. A large surface of the thermal pad 41 is attached to the second dual PCBA circuit board 213 fixedly mounted on the rear cover 32, and another large surface is attached to one end surface of the heat dissipation shield 6.

[0075] The surface of the dual PCBA circuit board 213 fixedly mounted on the rear cover that is in contact with the thermal pad 41 is a square plane without printed circuit lines, and the size of the square plane is the same as the size of the large surface of the thermal pad 41. The end surface of the heat dissipation shield 6 that is in contact with the thermal pad 41 is a square plane that forms a surface contact with the thermal pad 41, and the size of the square plane is the same as the size of the large surface of the thermal pad 41.

[0076] The thermal pad 41 is made of elastic rubber material and has a thickness greater than the spacing gap A between the second double PCBA circuit board 213 near the rear cover and the heat dissipation shielding member 6 .

[0077] The surface of the heat dissipation shielding member 6 may be provided with a chemical corrosion resistant coating.

[0078] The above is only one solution of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A plastic housing vehicle-mounted camera module, comprising a lens assembly (1), an imaging module (2), an outer housing (3), a heat conducting assembly (4) and an external connector (5), characterized in that : comprising a heat dissipation shielding member (6), the outer contour of the heat dissipation shielding member (6) having a protruding portion and a concave avoidance portion; The outer shell (3) comprises a front cover (31) and a rear cover (32), and the front cover (31) and the rear cover (32) are made of plastic material; The front cover (31) and the rear cover (32) are fixedly sealed and connected and jointly define a housing cavity, the imaging module (2) is accommodated in the housing cavity, the external connector (5) is electrically connected to the imaging module (2), the external connector (5) extends from the rear cover (32), and a cover wall of the front cover (31) partially faces outward and forms a mounting sleeve (37) for accommodating the lens assembly (1); The imaging module (2) comprises: an imaging circuit board group (21) and a photosensitive element (22); In a parallel range equal to the base material area of ​​the circuit board in the imaging circuit board group (21) close to the back cover (32), at a top surface away from the back cover (32), the heat dissipation shielding member (6) has a concave avoidance portion, the size and shape of the concave avoidance portion matching the convex shape formed by the electronic components mounted on the side of the circuit board in the imaging circuit board group (21) close to the back cover close to the back cover (32); A spacing gap (A) is provided between the concave avoidance portion of the heat dissipation shielding member (6) and the side convex portion of the circuit board close to the back cover (32) in the imaging circuit board group (21) of the imaging module (2).

2. The plastic housing vehicle-mounted camera module according to claim 1, characterized in that: The imaging circuit board group (21) is composed of at least one PCBA circuit board, the PCBA circuit boards are electrically connected to each other, and the photosensitive element (22) is fixed to the PCBA circuit board close to the lens assembly.

3. The plastic housing vehicle-mounted camera module according to claim 2, characterized in that: The heat dissipation shielding component (6) is fixedly connected to the inner surface of the bottom wall of the rear cover (32), and the shape of the bottom surface of the heat dissipation shielding component (6) corresponds to the shape of the inner surface of the bottom wall of the rear cover (32).

4. The plastic housing vehicle-mounted camera module according to claim 3, characterized in that: The heat dissipation shielding member (6) is provided with a through hole matching the outer shape of the external connector (5).

5. The plastic housing vehicle-mounted camera module according to claim 4, characterized in that: The side surface shape of the heat dissipation shielding component (6) corresponds to the inner surface shape of the four walls of the accommodating cavity.

6. The plastic housing vehicle-mounted camera module according to claim 5, characterized in that: A gap, called a side gap (B), is provided between the circuit board in the imaging circuit board group (21) close to the rear cover (32) and the inner surface of the inner wall of the accommodating cavity. Within the range of the side gap (B), the top surface of the heat dissipation shielding component (6) extends toward the inner surface of the bottom wall of the front cover (31), and a top gap (C) is provided between the top surface of the heat dissipation shielding component (6) and the inner surface of the bottom wall of the front cover (31).

7. The plastic housing vehicle-mounted camera module according to claim 6, characterized in that: The heat dissipation shielding component (6) is made of metal.

8. The plastic housing vehicle-mounted camera module according to claim 7, characterized in that: It comprises a grounding contact point, and the heat dissipation shielding component (6) and the imaging module (2) are connected to the ground via the grounding contact point.

9. The plastic housing vehicle-mounted camera module according to claim 8, characterized in that: The cover wall of the rear cover (32) is provided with a through hole, and the edge of the through hole cooperates with the external connector (5); the mounting sleeve (37) is a cylinder that partially protrudes outward from the bottom wall of the front cover, and the mounting sleeve (37) is provided with an internal thread. The outer surface of the lens assembly (1) is provided with an external thread. The lens assembly (1) is threadedly connected to the mounting sleeve (37), and the mounting sleeve (37) and the front cover (31) are an integrated structure.

10. The plastic housing vehicle-mounted camera module according to claim 8, characterized in that: The cover wall of the rear cover (32) is provided with a through hole, the edge of which cooperates with the external connector (5); the mounting sleeve (37) provided on the front cover (31) needs to be connected to the inside of the accommodating cavity, and the mounting sleeve (37) and the front cover (31) are separate structures.

11. The plastic housing vehicle-mounted camera module according to claim 9 or 10, characterized in that: The respective ends of the front cover (31) and the rear cover (32) are capable of matching with each other, one matching end is provided with a convex rib around it, and the other matching end is provided with a groove around it, and the convex rib is plugged into and matched with the groove; the outer shell (3) also includes a sealing ring (33) arranged in the groove and abutting against the convex rib.

12. The plastic housing vehicle-mounted camera module according to claim 11, characterized in that: Sealant is applied between the through hole of the rear cover (32) and the external connector (5), and sealant is applied between the lens assembly (1) and the mounting sleeve (37).

13. The plastic housing vehicle-mounted camera module according to claim 8, characterized in that: The electrical connection between the circuit boards of the imaging circuit board group (21) is a flexible circuit board electrical connection or an internal connector electrical connection.

14. The plastic housing vehicle-mounted camera module according to claim 13, characterized in that: The front cover (31) is provided with a protruding or recessed positioning seat (34) for fixing or limiting the imaging module, and the imaging circuit board group (21) is fixedly connected to the front cover (31) via the positioning seat (34).

15. The plastic housing vehicle-mounted camera module according to claim 13, characterized in that: The rear cover (32) is provided with a protruding or recessed positioning seat (34) for fixing or limiting the imaging module, and the imaging circuit board group (21) is fixedly connected to the rear cover via the positioning seat (34).

16. The plastic housing vehicle-mounted camera module according to claim 14 or 15, characterized in that: A heat-conducting component (4) is fixedly arranged between the imaging circuit board group (21) and the heat-dissipating shielding component (6), and the heat-conducting component (4) is made of silica gel or rubber.

17. The plastic housing vehicle-mounted camera module according to claim 16, characterized in that: The heat-conducting component (4) comprises a heat-conducting pad (41), which is flat and square. A large surface area of ​​the heat-conducting pad (41) is attached to a circuit board in the imaging circuit board group (21) close to the rear cover (32), and another large surface area is attached to an end surface of the heat-dissipating shield (6).

18. The plastic housing vehicle-mounted camera module according to claim 17, characterized in that: The end surface of the imaging circuit board group (21) connected to the heat-conducting component (4) is in a planar shape that forms surface contact with the heat-conducting component (4) and has an outer shape that matches the heat-conducting component (4).

19. The plastic housing vehicle-mounted camera module according to claim 18, characterized in that: The end surface of the heat dissipation shielding member (6) connected to the heat-conducting component (4) is in a planar shape that forms surface contact with the heat-conducting component (4) and has an outer shape that matches the heat-conducting component (4).

20. The plastic housing vehicle-mounted camera module according to claim 1, characterized in that: An insulating layer is provided on the surface of the heat dissipation shielding member (6).

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