CN216086772U - Plastic housing vehicle-mounted camera module - Google Patents

Abstract

The utility model relates to a plastic shell vehicle-mounted camera module which comprises a lens component (1), an imaging module (2), a shell body (3), a heat conduction component (4), an outer connector (5) and a heat dissipation shielding piece (6), wherein the outer contour of the heat dissipation shielding piece is provided with a convex part and a concave avoiding part. The shell body is made of plastic materials in a molding mode, the heat dissipation shielding piece is made of metal with good heat conductivity, and the heat dissipation shielding piece and the imaging module are communicated and grounded through the grounding contact point to play a shielding role. The heat radiation shielding part is arranged in the cavity of the shell body, the space of the cavity is accommodated in the shell body, the heat radiation shielding part is maximized in volume, the lower portion and the periphery of the imaging module are surrounded, the heat conduction assembly is fixedly arranged between the circuit board and the heat radiation shielding part, and heat of a heating part is conducted to the heat radiation shielding part through the heat conduction assembly and the temperature of the heating element is effectively reduced through the heat radiation effect between the circuit board and the heat radiation shielding part. The utility model effectively solves the problems of heat dissipation and shielding of the plastic shell camera module during high power consumption.

Description

Plastic housing vehicle-mounted camera module

Technical Field

The utility model relates to the technical field of cameras, in particular to a vehicle-mounted camera module with a plastic shell.

Background

Along with the development trend of automobile intellectualization, the camera has a more and more prominent position in the automobile field; with the continuous enhancement of the safety protection consciousness of people on driving, drivers need to watch blind areas around the vehicle body and road conditions at any time, and the number of the vehicle-mounted cameras on the vehicle is continuously increased. At present, cameras are mainly applied to reverse images (rear view) and 360-degree panorama (round view), and 8 cameras are equipped for various auxiliary devices of high-end automobiles and used for assisting drivers to park or trigger emergency brakes. When the cameras are successfully substituted for the side view mirrors, the number of cameras on the automobile will reach 12. For the vehicle-mounted environment, the camera with the plastic shell has many advantages, the high-strength all-plastic shell is light in weight, durable, good in waterproof performance, flame-retardant, impact-resistant and heat-resistant, is a good insulator and protects a user from being damaged by electricity, in addition, the high-strength plastic shell has very stable property and can play a relatively stable protection role in high-temperature or low-temperature environments, and the plastic shell is strong in corrosion resistance and does not react with acid and alkali. The plastic molding processing technology is mature, the production period of the plastic shell is short, the manufacturing cost is low, and the plastic shell is easy to be molded into a special surface shape.

For the vehicle-mounted camera module, the interference of electromagnetic signals of various electronic equipment in a vehicle can be shielded, the temperature of an imaging circuit board caused by work can be quickly reduced, and the vehicle-mounted camera module is an important factor for improving the camera quality and prolonging the service life; in addition, the vehicle-mounted camera shell also needs to be resistant to corrosion, stable in performance in high-temperature and low-temperature environments, high in sealing performance requirement and waterproof.

In order to solve the problems of signal shielding and heat dissipation of a plastic shell vehicle-mounted imaging module, the specification of chinese patent CN 109474778A discloses a plastic laser front shell penetration welded vehicle-mounted camera, which comprises a front shell, a rear shell, a first substrate, a second substrate, wherein the front shell and the rear shell are made of plastic materials, 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 front shell for positioning the side convex end of 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 positioned in a convex manner, the first substrate is fixedly mounted on a rear end substrate mounting piece of the front shell, the second substrate is fixedly mounted on a corresponding substrate mounting piece of the rear shell, a first rear end connecting piece of the first substrate is connected in a front end slot of the second substrate, the rear shell is provided with a front shell, a rear shell and a front shell, wherein the front shell is provided with a front end slot and a rear end slot, the front shell is provided with a front end, the rear shell is provided with a front end and a rear end, the front end is provided with a front end groove, the rear end is provided with a rear end groove, the front end groove is provided with a rear end groove, the rear end groove is provided with a front end groove, the front end groove is provided with a rear end groove, the rear end groove is provided with a front end groove and a rear end groove, the front end groove is provided with a front end groove, the rear end groove is provided with a rear end groove, the front end groove is provided with a rear end groove, the rear end groove is provided with a front end groove and a rear end groove, the rear end groove is provided with a rear end groove, the rear end groove is provided with a rear end, the rear end groove is provided with a rear end, the rear end groove, the rear end groove is provided with a rear end groove, the rear end is provided with a rear end, the rear end groove, the rear end groove is provided with a rear end groove, the rear end groove is provided with a rear end, the rear end is provided with a rear end, the rear end.

According to the camera with the plastic shell disclosed in the specification of CN 109474778A, although the purpose of shielding interference signals can be achieved, the metal layer is formed by sputtering, the thickness of the metal layer is not enough to achieve a good heat dissipation effect, so that electronic elements are easy to age due to overhigh temperature of a circuit board of the camera, and the imaging quality of the camera is reduced; the shell is whole welded structure, though the leakproofness is good, but the camera if internals damages, can not conveniently dismantle open the shell and maintain.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned drawbacks in the prior art, an object of the present invention is to provide a plastic-shell vehicle-mounted camera module, which can shield electromagnetic signals of various electronic devices in a vehicle and rapidly absorb a large amount of heat generated by high-power-consumption electronic components on an imaging circuit board during operation, thereby reducing the temperatures of the imaging circuit board and the high-power-consumption electronic components.

In order to solve the technical problem, the utility model provides a plastic-shell vehicle-mounted camera module which comprises a lens component, an imaging module, a shell, a heat conduction component, an outer connector and a heat dissipation shielding piece, wherein the outer contour of the heat dissipation shielding piece is provided with a convex part and a concave avoiding part.

The shell body comprises a front cover and a rear cover, and the front cover and the rear cover are made of high-strength plastic materials in a molding mode. The high-strength all-plastic shell is light in weight, durable, good in waterproof performance, flame-retardant, impact-resistant and heat-resistant, is a good insulator and can protect a user from being damaged by electricity, in addition, the high-strength plastic shell has very stable properties, can play a relatively stable protection role in high-temperature or low-temperature environments, and is strong in corrosion resistance and free from reaction with acid and alkali. The plastic molding processing technology is mature, the production period of the plastic shell is short, the manufacturing cost is low, and the plastic shell is easy to be molded into a special surface shape.

Noise immunity is a key factor in vehicle camera module technology because the cable can become an antenna in the vehicle, producing harmful results. The proliferation of electrical and electronic systems in vehicles requires that these systems have good internal and external shielding to allow the various electronic systems in the vehicle to coexist in a compatible manner. Set up the ground contact point in above-mentioned plastic casing vehicle-mounted camera module, the heat dissipation shielding piece passes through with imaging module ground connection contact point intercommunication. Because the heat dissipation shielding part is made of metal materials, and surrounds the bottom and the periphery of the imaging module, the camera module can be well shielded and used as a static conduction path, imaging blurring can be effectively prevented, noise is generated during imaging, and the compatibility of the vehicle-mounted camera module is improved.

The front cover and the rear cover are fixedly and hermetically connected and jointly define a containing cavity, the imaging module is contained in the containing cavity, the external connector is electrically connected to the imaging module, and the external connector extends out of the rear cover; the cover wall of the front cover is partially outward and forms a mounting sleeve of the lens assembly, and the lens assembly is inserted into the mounting sleeve and connected with the mounting sleeve.

Furthermore, a through hole is formed in the cover wall of the rear cover, and the edge of the through hole is matched with the outer connector; the mounting sleeve is a cylinder which is arranged by partially protruding the bottom wall of the front cover outwards, the mounting sleeve is provided with internal threads, the outer surface of the lens component is provided with external threads, and the lens component is in threaded connection with the mounting sleeve; the mounting sleeve and the front cover are of an integrated structure and are made of plastic materials and the front cover in an integrated forming mode, and sealing is facilitated; or the mounting sleeve and the front cover are of a split structure.

The installation cover that sets up on the protecgulum needs with hold intracavity portion intercommunication, makes the lens that light passes through the camera lens reach imaging module's photosensitive element.

The matched end parts of the front cover and the rear cover can be matched, one matched end part is provided with a circle of convex ribs, the other matched end part is provided with a circle of grooves, and the convex ribs are in insertion fit with the grooves; the outer shell further comprises an elastic sealing ring which is arranged in the groove and is abutted against the convex rib; preceding lid and hou gai detachably connected mode are convenient for follow-up maintenance work, the leakproofness of shell body has been guaranteed to protruding muscle and recess with the mounting means of sealing washer, it is waterproof dustproof, in addition coat sealed glue between the via hole of back lid and the external connector, coat sealed glue behind threaded connection between camera lens subassembly and installation cover, if the installation cover is the structure of components of a whole that can function independently with the preceding lid, also need seal glue at the position of connecting, whole shell body waterproof performance is good like this, at the in-process of rainy or carwash, the on-vehicle module of making a video recording can not intake the water and damage.

Imaging module in the on-vehicle module of making a video recording of above-mentioned plastic casing includes: the imaging circuit board group can be formed by at least one PCBA circuit board, the PCBA circuit boards are electrically connected in a mode that the inner connectors are electrically connected or the PCBAs are electrically connected by using flexible circuit boards, and the photosensitive elements are respectively close to the PCBA circuit boards of the lens component. The imaging module which adopts a high-definition wide-angle lens or consists of two or more PCBA circuit boards can improve the definition and the imaging quality of vehicle-mounted camera shooting, and the picture is clear.

Further, the imaging circuit board set comprises an ISP chip or/and a VP chip. An ISP, an abbreviation of "Image Signal Processor", is a unit for processing an output Signal of the front-end Image sensor. The application of the method ensures that the effect when human eyes see the digital image is as close as possible to the effect when human eyes see the real scene. After the lens projects the light signal to the photosensitive area of the circuit board, the sensor transmits the original image of Bayer color format to ISP through photoelectric conversion, and the ISP outputs the image of RGB color mode space domain to the video acquisition unit at the rear end through algorithm processing. In the process, the ISP performs corresponding control on the lens and the sensor by the Firmware running on the ISP, so that the functions of automatic aperture, automatic exposure, automatic white balance and the like are completed. Artificial intelligence technology is entering the imaging industry field as a new technical innovation element, so that image processing and calculation are facing more challenges, and a high-end high-definition camera is added with a Vision Processor (VP) chip with AI capability besides an ISP chip.

In the above-mentioned vehicle-mounted camera module with plastic casing, because the front cover and the rear cover are made of plastic materials, the positioning seats for fixing or limiting the protrusions or the grooves of the imaging module can be conveniently arranged on the inner surface of the front cover or the inner surface of the rear cover, and the imaging circuit board group is fixedly connected with the front cover or the rear cover through the positioning seats. The positioning seat can be integrated with the front cover or the rear cover, and can also be fixedly arranged on the front cover or the rear cover through a positioning column or a press riveting column. The fixed connection mode can be a positioning screw, a clamping hook or a clamping groove.

The surface shape of the bottom surface of the heat dissipation shielding piece is matched with the surface shape of the inner surface of the bottom wall of the rear cover, a through hole matched with the outer shape of the outer linker is arranged on the heat dissipation shielding piece, the outer linker extends out of the rear cover through the through hole, and the outer linker is connected with a cable to transmit signals to the visual output device in the vehicle. In order to make electronic circuit technology work better, it is necessary to select an electrical connector with high performance and high adaptation rate to ensure excellent environmental resistance such as noise resistance and high waterproof performance. The heat dissipation shielding piece is tightly and fixedly connected to the inner surface of the bottom wall of the rear cover without a gap in a fixing mode such as fixing by a screw or a riveting column, and if the fixing is the fixing by the riveting column, the riveting part and the rear cover are fixed into a whole; if the screw is used for fixing, the screw column body and the rear cover are detachably fixed into a whole. In the range that the radiating shielding piece is parallel to the base material of the circuit board close to the rear cover in the imaging circuit board group and has the same area, the radiating shielding piece is provided with a plurality of concave avoidance parts on the top surface far away from the rear cover. The size and the shape of the concave avoidance part are matched with the convex shape formed by electronic elements arranged on the side surface, close to the rear cover, of the circuit board, close to the rear cover, in the imaging circuit board group.

A spacing distance gap A is arranged between the concave avoiding part of the heat dissipation shielding piece and the protruding part of the imaging module. The existence of the gap can protect the elements on the circuit board from being damaged by extrusion, and simultaneously, the heat generated by the circuit board is conducted to the air layer of the gap in the form of heat radiation, which is a way for radiating the heat of the heating circuit board.

The surface shape of the side face of the heat dissipation shielding piece is matched with the shape of the inner surface of the four walls of the accommodating cavity, a side gap B exists between the circuit board close to one side of the rear cover of the camera module and the inner surface of the inner wall of the accommodating cavity, the top surface of the heat dissipation shielding piece in the gap range extends towards the inner surface direction of the bottom wall of the front cover, and a top gap C is arranged between the top surface of the heat dissipation shielding piece and the inner surface of the bottom wall of the front cover. The side clearance B is defined by the external dimensions of the accommodating cavity of the outer shell and the circuit board, and the outer shell and the accommodating cavity are ensured not to generate installation interference. The radiating shielding piece at the side gap B forms a continuous structure to surround all electronic elements of the imaging module, so that the shielding effect is ensured, the electronic circuit of the automobile is protected, and the anti-interference and anti-radiation effects are better achieved. In the vehicle-mounted imaging module according to the present invention, the outer shape of the heat radiation shield changes with the change of the outer shape profile of the imaging module that generates heat, and the gap between the two is always kept constant, and the heat radiation shield is located in the vicinity of the heat generating circuit board in a surrounding manner as close as possible. The resulting effect is that, unlike the prior art, the heat-dissipating shield itself is increased in thickness, maximizing its volume within the containment chamber. The volume is maximized, which is beneficial to the heat dissipation shielding piece to absorb and store heat. This is another main heat dissipation path of the imaging module that generates heat in the vehicle-mounted camera module according to the present invention.

It is known that when the temperature of an electronic component is high, if the component cannot be cooled, an extremely high temperature is generated, thereby causing an electron migration phenomenon. Electromigration is the high velocity flow of electrons that results in migration of metal atoms. The damage of electronic migration to a circuit board and a chip is a slow process, once a circuit is damaged, the situation becomes more serious, and finally, the whole circuit is short-circuited. The high temperature generated by the short circuit of the circuit can even cause the whole electronic element to generate phenomena of burning, explosion and the like, thereby causing great harm to the safety of people and buildings. The heat dissipation shielding part of the vehicle-mounted camera module can conduct heat in heating electronic elements on the circuit board of the imaging module to the maximum extent, effectively and rapidly reduces the temperature of the heating circuit board, improves the imaging quality, enhances the reliability and eliminates potential safety hazards in vehicle driving.

The heat dissipation shield is made of a metal having good thermal conductivity.

Further, the heat radiation shield is made of a metallic material iron alloy having good thermal conductivity.

Further, the heat radiation shield is made of a metal material aluminum or an aluminum alloy having good thermal conductivity.

Further, the heat dissipation shield is made of a metallic material copper or copper alloy having good thermal conductivity.

In order to conduct heat more effectively, a heat conducting component is fixedly arranged between the imaging circuit board group and the heat dissipation shielding piece, and the heat conducting component comprises at least one heat conducting pad which is flat and is preferably made of elastic materials. The large-area surface of the heat conducting pad is attached to the circuit board in the imaging circuit board group in the direction close to the rear cover, and the other large-area surface is attached to one end surface of the heat dissipation shielding member. The end surface of the imaging circuit board group connected with the heat conducting component is in a plane shape in surface contact with the heat conducting component and is in a shape matched with the heat conducting component. The end surface of the heat radiation shield connected with the heat conduction component is in a plane shape in surface contact with the heat conduction component and is in a shape matched with the heat conduction component.

The heat conducting component is made of heat conducting materials, and a heat conducting path is formed between the heating circuit board and the heat dissipation shielding piece.

Further, the heat conducting component is made of silica gel which is prepared by liquid silicon and solid silicon after certain chemical changes.

Furthermore, the heat conducting component is made of rubber.

The surface of the heat dissipation shielding part can be provided with an insulating layer, so that the safety of people in the vehicle is prevented from being protected by electric leakage.

Further, the surface of the heat dissipation shielding piece is processed by electroplating and/or chemical corrosion prevention.

In summary, the utility model has the following beneficial effects: according to the concept of the utility model, the volume of the heat dissipation shield in the camera module accommodating cavity is made as large as possible. The heat dissipation shield itself has a volume that absorbs heat from the surrounding environment and contains it in the heat dissipation shield. The volume is as large as possible, so that the local part of the heat dissipation shielding piece is close to the corresponding part of the imaging module as close as possible, and the heat on the imaging module is absorbed rapidly and massively. As large a volume as possible, more heat can be absorbed and stored, thereby more effectively reducing the temperature of the imaging module.

According to the concept of the utility model, the outline shape of the part of the heat dissipation shielding piece corresponding to the imaging module is designed to change along with the change of the side surface bulge or the dent of the PCBA circuit board close to the rear 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 the electronic component is recessed into the circuit board. The depth of the recess corresponds to the height of the protrusion of the corresponding electronic component. In particular, according to the concept of the present invention, the distance between the opposing surfaces or portions of the heat-dissipating shield is maintained constant regardless of how much the electronic component protrudes from the circuit board and regardless of how much the corresponding portion of the heat-dissipating shield is recessed. Therefore, no matter what height or length of the electronic element which can generate heat in work is arranged on the circuit board, the heat dissipation shielding part can equally absorb the heat on the imaging module and timely cool the imaging module.

According to the concept of the present invention, the volume of the heat radiation shield is maximized in a fixed space by using the surface variation of the heat radiation shield that varies following the projection or depression of the imaging module, thereby absorbing heat in the receiving imaging module as rapidly and largely as possible by using heat radiation in the non-contact area of the heat radiation shield and the circuit board.

In accordance with the concepts of the present invention, the profile of the heat dissipation shield varies, not fixedly, depending on the particular imaging module receiving cavity shape. The changing principle is that the outline of the heat dissipation shielding piece is changed along with the arrangement change of the electronic elements on the circuit board; the quantification principle of the variation is to keep the distance between the outline of the heat-dissipating shield and the electronic components arranged on the circuit board constant. It is particularly advantageous for the on-board imaging module to maintain the spacing at 2-5 millimeters. Such a spacing allows for maximum rapid heat absorption without adversely affecting the electronic components on the imaging circuit board assembly of the imaging module. The length of the large-volume metal heat dissipation shielding piece can cover the length of the whole imaging module, and the interference of electromagnetic signals of other electronic equipment in a vehicle can be effectively shielded; the electronic components of the imaging module can generate a large amount of heat under the high energy consumption state, so that the temperature of a system for working the whole camera is very high, the electronic components in the camera are easy to age and damage under the high-temperature environment, the imaging of the camera also has the problems of thermal noise and imaging blurring, the maximization of the volume of the heat dissipation shielding part can rapidly reduce the temperature of the imaging circuit board caused by working, the imaging performance is improved, the service life is prolonged, and the safety risk coefficient is reduced.

The shell made of high-strength engineering plastics resists impact, and the plastic shell of the vehicle-mounted camera can resist corrosion and has stable performance in high-temperature and low-temperature environments; the plastic shell is detachable and has high sealing performance and a waterproof effect; the utility model adopts the following three waterproof modes at the joints at the outside, and the structure is waterproof; secondly, the sealing ring is waterproof; thirdly, sealing glue is used for preventing water. Good leakproofness has effectively avoided the car wash after or when rainy day on-vehicle module of making a video recording to take place the circuit short circuit, perhaps the camera is fuzzy scheduling problem.

The present invention will be described in detail with reference to the following embodiments and accompanying drawings in order to make the present invention more comprehensible.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of a plastic-shell vehicle-mounted camera module according to the present invention.

FIG. 2 is a schematic top view along line A-A of FIG. 1.

Fig. 3 is a schematic structural diagram of another embodiment of the plastic-shell vehicle-mounted camera module of the utility model.

FIG. 4 is a bottom view along line B-B of FIG. 3.

The meaning of each number in the figure is: 1-a lens assembly; 2-an imaging module; 21-an imaging circuit board set; 211-single PCBA circuit board; 212-double PCBA circuit board I; 213-double PCBA circuit board II; 22-a photosensitive element; 23-an internal connector; 3-an outer shell; 31-a front cover; 32-rear cover; 33-sealing ring; 34-positioning seat; 35-riveting and riveting columns; 36-set screws; 37-mounting the sleeve; 4-a thermally conductive assembly; 41-a heat conducting pad; 5-an external connector; 6-Heat dissipation shield.

Detailed Description

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the present invention will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the utility model, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

In describing embodiments of the present invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship that is based on the orientation or positional relationship shown in the associated drawings, which is for convenience and simplicity of description only, and does not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, the above-described terms should not be construed as limiting the present invention.

The present invention is described in detail below with reference to the drawings and the specific embodiments, which are not repeated herein, but the embodiments of the present invention are not limited to the following embodiments.

Fig. 1 is a schematic structural diagram of an embodiment of a plastic-shell vehicle-mounted camera module according to the present invention, and the plastic-shell vehicle-mounted camera module shown in fig. 1 includes a lens assembly 1, an imaging module 2, an outer shell 3, a heat conducting assembly 4, an outer connector 5, and a heat dissipation shield 6, and an outer contour of the heat dissipation shield 6 has a convex portion and a concave avoiding portion. The outer case 3 includes: the front cover 31 and the back cover 32, and the front cover 31 and the back cover 32 are made of plastic materials by molding. The imaging module 2 includes: imaging circuit board group 21, photosensitive element 22, imaging circuit board group 21 is single PCBA circuit board 211, and photosensitive element 22 is fixed in single PCBA circuit board 211. The single PCBA circuit board 211 is formed by integrally assembling various electronic components required for image pickup on a printed circuit board PCB by a surface mounting process. The single PCBA circuit board 211 is integrated with other required electronic modules such as an image information processing module, an image sensing module and a power supply module, the functions of an original signal board and a power control board are integrated, the total power consumption is reduced, the space occupied by a circuit board is saved, and the miniaturization of the vehicle-mounted camera module is facilitated.

In the present embodiment, the imaging module 2 is provided with a ground contact point, and the heat dissipation shield 6 and the imaging module 2 are connected to the ground through the ground contact point, so as to perform the functions of electromagnetic shielding and serving as an electrostatic conduction path.

In this embodiment, the front cover 31 and the back cover 32 are fixedly and hermetically connected and together define a rectangular receiving cavity, the external connector 5 protrudes from the back wall of the back cover, the cover wall of the front cover 31 partially faces outwards and forms a mounting sleeve 37 of the lens assembly, and the mounting sleeve 37 is integrally formed with the front cover 31.

The single PCBA circuit board 211 is fixedly accommodated in the accommodating cavity; the outer connector 5 is electrically connected to the single PCBA circuit board 211, the terminals of which extend into the receiving cavity to be electrically connected with the terminal bases on the single PCBA circuit board 211, the cover wall of the rear cover 32 is provided with circular through holes, and the edges of the through holes are matched with the outer connector 5.

The installation cover 37 is the cylinder that the local outside protrusion of diapire of protecgulum 31 set up, and installation cover 37 need with hold the inside intercommunication of intracavity, and installation cover 37 is equipped with thin tooth internal thread, and lens subassembly 1 surface is provided with thin tooth external screw thread, and lens subassembly 1 is installed in installation cover 37 rather than detachable the structure of being connected, installation cover 37 and protecgulum 1 as an organic whole with thin tooth screw thread.

The matched ends of the front cover 31 and the rear cover 32 can be matched, a circle of linear convex ribs are arranged at the matched rectangular end of the front cover 31, a circle of linear grooves are arranged at the matched rectangular end of the rear cover 32, and the linear convex ribs are in plug fit with the linear grooves; the fit is transition or interference fit, so that the connection between the front cover 31 and the rear cover 32 has certain strength; the outer shell 3 can also include a silica gel elastic sealing ring 33 which is arranged on the linear groove and is butted against the linear convex rib, the front cover 31 and the rear cover 32 are further fastened by screws at the right angle of the rectangle, the strength of the outer shell is enhanced, and the deformation of the silica gel sealing ring is increased, so that better sealing performance is obtained. Sealant is applied between the via holes of the rear cover 32 and the external connector 5, and between the lens module 1 and the mounting sleeve 37.

The inner surface of the front wall of the front cover 31 is provided with positioning holes 34, screw holes are arranged in the positioning seats 34, and the single PCBA circuit board 211 is fixed on the positioning seats 34 through screws so as to be fixedly connected with the front cover 31. The heat dissipation shielding part 6 is fixedly connected with the inner surface of the bottom wall of the rear cover 32 by screws in a tight and gapless manner, the surface shape of the bottom surface of the heat dissipation shielding part 6 is matched with the inner surface shape of the bottom wall of the rear cover 32, the diameter of a through hole of the heat dissipation shielding part 6 is the same as that of a through hole of the rear cover 32, and the axes of the two holes are coaxially arranged.

In the range where the heat radiation shield 6 is parallel to the base material of the single PCBA circuit board 211 and has the same area, the heat radiation shield 6 is provided with a plurality of concave escape portions on the top surface away from the rear cover 32, and the size and shape of the concave escape portions are matched with the convex shape formed by the electronic components mounted on the side surface of the single PCBA circuit board 211 close to the rear cover.

A spacing distance gap a is provided between a concave escape portion of the side of the heat radiation shield 6 away from the rear cover 32 and a convex portion of the single PCBA circuit board 211 on the side close to the rear cover 32.

The surface shape of the side face of the heat radiation shielding piece 6 is matched with the inner surface shape of four walls of the rectangular accommodating cavity, a side gap B exists between the single PCBA circuit board 211 and the inner surface of the inner wall of the accommodating cavity, the top surface of the heat radiation shielding piece 6 within the range of the side gap B extends towards the inner surface direction of the bottom wall of the front cover 31, and a top gap C is arranged between the top surface of the heat radiation shielding piece 6 and 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 receiving cavity of the outer housing 3 and the single PCBA circuit board 211. In imaging module 2 according to the present invention, the outer shape of heat radiation shield 6 changes with the change in the outer shape profile of single PCBA circuit board 211, and the gap therebetween is always kept constant, so that heat radiation shield 6 is located as close as possible to single PCBA circuit board 211, in surrounding relation thereto, and in addition, single PCBA circuit board 211 is mounted to front cover 31, so that the volume of heat radiation shield 6 in the rectangular receiving cavity is maximized. The volume is maximized, which is beneficial for the heat dissipation shield 6 to absorb and store heat. This is a major alternative heat dissipation path for heat-generating electronic components in an imaging module 2 according to the present invention.

The heat radiation shield 6 is made of metal having good thermal conductivity.

The heat radiation shield 6 of the present embodiment is made of a metal material aluminum alloy having good thermal conductivity, taking into consideration the thermal conductivity, price, and processing cost of the metal material.

In order to conduct heat more efficiently, a thermal pad 41 is fixedly disposed between the single PCBA circuit board 211 and the heat dissipation shield 6, the thermal pad 41 having a flat square shape, preferably made of silicone. A large-area surface of the thermal pad 41 is attached to the single PCBA circuit board 211, and another large-area surface is attached to one end surface of the heat radiation shield 6.

The surface of the single PCBA circuit board 211 that is attached to the thermal pad 41 is a square surface without printed circuit lines, and the size of the square surface is the same as the size of the large surface of the thermal pad 41. The end surface of the heat radiation shield 6 attached to the thermal pad 41 is a square plane surface in surface contact with the thermal pad 41, and the size of the square plane surface is the same as the size of the large surface of the thermal pad 41.

The thermal pad 41 is made of an elastic silicone material. The thermal pad 41 has a thickness greater than the separation distance gap a between the single PCBA circuit board 211 and the heat sink shield 6 proximate the back cover 31.

An insulating layer can be arranged on the surface of the heat dissipation shielding part 6, so that the safety of people in the vehicle is prevented from being protected by electric leakage.

Fig. 3 is a schematic structural diagram of another embodiment of the plastic-shell vehicle-mounted camera module according to the present invention, and the plastic-shell vehicle-mounted camera module shown in fig. 3 includes a lens assembly 1, an imaging module 2, an outer shell 3, a heat conducting assembly 4, an outer connector 5, and a heat dissipation shield 6, and an outer contour of the heat dissipation shield 6 has a convex portion and a concave avoiding portion. The outer case 3 includes: the front cover 31 and the back cover 32, the front cover 31 and the back cover 32 are made of high-strength engineering plastic materials by molding. The imaging module 2 includes: the imaging circuit board group 21 and the photosensitive element 22, the imaging circuit board group 21 is two PCBA circuit boards, which are a double PCBA circuit board one 212 and a double PCBA circuit board two 213, to realize the high-definition shooting of the vehicle-mounted shooting module, and the photosensitive element is fixed on each PCBA circuit board. The two PCBA circuit boards are electrically connected by an internal connector.

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 a copper-exposed grounding plane. The heat dissipation shield 6 and the imaging module 2 are connected to the ground through the ground contact point to perform electromagnetic shielding and function as a static electricity conducting path, and when air is discharged, the static electricity discharging path is from the metal shield 6 to the imaging circuit board group 21 to the male and female seats of the external connector 5 to the wire harness shielding layer and is finally released to the vehicle body and to the ground.

In the present embodiment, the front cover 31 and the rear cover 32 are fixedly and hermetically 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 of a cylindrical structure, the mounting sleeve 37 and a mounting seat of the lens mounting sleeve 37 of the front cover 31 are detachably and threadedly mounted into a body, and the mounting sleeve 37 is made of high-strength engineering plastics through molding.

The mounting sleeve 37 needs to be communicated with the inside of the accommodating cavity, the mounting sleeve 37 is provided with a fine thread internal thread, the outer surface of the lens component 1 is provided with a fine thread external thread, the lens component 1 is mounted in the mounting sleeve 37 by the fine thread internal thread and is detachably connected with the mounting sleeve 37, and the mounting sleeve 37 and the front cover 31 are of a split structure.

The imaging circuit board group 21 is fixedly accommodated in the accommodating cavity; the outer connector 5 extends out of the rear wall of the rear cover, the outer connector 5 is connected with the double PCBA circuit board II 213, the terminal of the outer connector 5 extends into the accommodating cavity to be electrically connected with the terminal seat on the double PCBA circuit board II 213, the cover wall of the rear cover 32 is provided with a circular through hole, and the edge of the through hole is matched with the outer connector 5.

The matched respective ends of the front cover 31 and the rear cover 32 can be matched, a circle of circular convex rib is arranged at the matched circular end of the front cover 31, a circle of circular groove is arranged at the matched circular end of the rear cover 32, the linear convex rib is in plug-in fit with the linear groove, and the cross section of the linear convex rib is rectangular; the fit should be transition or interference fit, so that the connection between the front cover 31 and the rear cover 32 has certain strength; the outer shell 3 may further include a silicone elastic sealing ring 33 disposed on the linear groove and abutting against the linear rib, the front cover 31 and the rear cover 32 are further fastened by screws at the circular outer ring, the strength of the outer shell is enhanced, and the deformation of the silicone elastic sealing ring 33 is increased, so as to obtain better sealing performance. Sealant is coated between the via 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.

Two press riveting columns 35 are arranged at two ends of the inner surface of the rear wall of the rear cover 32, and the double PCBA circuit board II 213 is fixedly connected with the rear cover 32 through the press riveting columns 35. The two circuit boards are reliably connected by adopting a pin jack type inner connector. The double PCBA circuit board I212 is placed on one side close to the front cover, the pin jacks of the inner connector 23 are made of elastic copper alloy materials with good conductivity, and the surfaces of the double PCBA circuit board I are plated with silver and gold to achieve the purposes of small contact resistance and corrosion resistance. The inner connector 23 housing plus shielding ring used ensures a 360 electromagnetic interference shielding capability. The height of the rivet 35 determines the average thickness of the heat dissipation shield 6, so that the rivet 35 should be as high as possible to raise the circuit board in the accommodating cavity and ensure that the circuit board 212 close to the double PCBA circuit board does not interfere with the inner wall of the front cover 31.

The heat dissipation shielding part 6 is fixedly connected to the inner surface of the bottom wall of the rear cover 32 through riveting columns in a tight and gapless manner, the surface shape of the bottom surface of the heat dissipation shielding part 6 is matched with the inner surface shape of the bottom wall of the rear cover 32, the diameter of a through hole of the heat dissipation shielding part 6 is the same as that of a through hole of the rear cover 32, and the axes of the two holes are coaxially arranged.

In the range that the heat radiation shield 6 is parallel to the base material of the second PCBA circuit board 213 and has the same area, the heat radiation shield 6 is provided with a plurality of concave avoiding parts on the top surface far away from the rear cover 32. The size and shape of the concave escape portion match the shape of a protrusion formed by electronic components mounted on the side surface of the double PCBA circuit board II 213 close to the rear cover 32.

A spacing distance gap A is arranged between a concave avoidance part on the side surface of the heat dissipation shield 6 far away from the rear cover 32 and a convex part on the side surface of the double PCBA circuit board II 213 close to the rear cover.

The surface shape of the side face of the heat dissipation shielding piece 6 is matched with the shape of the inner surface of the four walls of the rectangular accommodating cavity, a side gap B is formed 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 shielding piece 6 within the range of the side gap B extends towards the inner surface direction of the bottom wall of the front cover 31, and a top gap C is arranged between the top surface of the heat dissipation shielding piece 6 and the inner surface of the bottom wall of the front cover 31. The side gap B is defined by the rectangular accommodation cavity of the outer case 3 and the outer dimensions of the imaging circuit board group 21. In the vehicle-mounted imaging module according to the present invention, the outer shape of the heat dissipation shield 6 changes with the change of the outer shape 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 located as close as possible to the vicinity of the imaging circuit board group 21 in a surrounding manner, and the volume of the heat dissipation shield 6 in the rectangular receiving cavity is maximized as much as possible although the imaging circuit board group 21 is mounted on the rear cover 32. The volume is maximized, which is beneficial for 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 vehicle-mounted camera module according to the present invention.

The heat radiation shield 6 is made of metal having good thermal conductivity.

The heat radiation shield 6 of the present embodiment is made of a copper alloy, which is a metal material having good thermal conductivity, in consideration of the thermal conductivity, price, and processing cost of the metal material.

In order to conduct heat more efficiently, a heat conducting pad 41 is fixedly disposed between the double PCBA circuit board two 213 and the heat radiation shield 6, and the heat conducting pad 41 is in the shape of a flat circle, preferably made of rubber. The heat conductive pad 41 has a large-area surface attached to the double PCBA circuit board two 213 fixedly mounted on the rear cover 32, and another large-area surface attached to one end surface of the heat radiation shield 6.

The surface of the second double PCBA circuit board 213 fixedly mounted on the rear cover, which is attached to the heat conducting pad 41, is a square plane without printed circuit lines, and the size of the square plane is the same as that of the large surface of the heat conducting pad 41. The end surface of the heat radiation shield 6 attached to the thermal pad 41 is a square plane surface in surface contact with the thermal pad 41, and the size of the square plane surface is the same as the size of the large surface of the thermal pad 41.

The thermal pad 41 is made of a rubber material having elasticity. The thermal pad 41 has a thickness greater than the separation distance gap a between the second double PCBA circuit board 213 and the heat sink shield 6 proximate the rear cover.

The surface of the heat dissipation shield 6 may be provided with a chemical corrosion resistant coating.

The above description is only one embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (22)

1. The vehicle-mounted camera module with the plastic shell comprises a lens component (1), an imaging module (2), a shell body (3), a heat conducting component (4) and an outer connector (5), and is characterized by comprising a heat dissipation shielding piece (6), wherein a convex part and a concave avoiding part are arranged on the outer contour of the heat dissipation shielding piece (6), and the heat dissipation shielding piece (6) is fixedly connected with the shell body (3) and is attached to the heat conducting component (4).

2. The plastic-covered vehicle-mounted camera module of claim 1, wherein: the outer shell (3) comprises a front cover (31), a rear cover (32) and a sealing ring (33), wherein the front cover (31) and the rear cover (32) are made of plastic materials in a molding mode;

the front cover (31) and the rear cover (32) are fixedly and hermetically connected and jointly define a containing cavity, the imaging module (2) is contained in the containing cavity, the external connector (5) is electrically connected to the imaging module (2), the external connector (5) extends out of the rear cover (32), and the cover wall of the front cover (31) is partially outward and forms a mounting sleeve (37) for containing the lens assembly (1).

3. The plastic-covered vehicle-mounted camera module of claim 2, wherein: the imaging module (2) comprises: imaging circuit board group (21), photosensitive element (22), imaging circuit board group (21) comprise a PCBA circuit board at least, and the electricity is connected between each PCBA circuit board, photosensitive element (22) are fixed in the PCBA circuit board that is close to the camera lens subassembly.

4. The plastic-covered vehicle-mounted camera module according to claim 3, characterized in that: the heat dissipation shielding piece (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 piece (6) corresponds to that of the inner surface of the bottom wall of the rear cover (32).

5. The plastic-covered vehicle-mounted camera module according to claim 4, wherein: the heat dissipation shielding piece (6) is provided with a through hole matched with the external connector (5) in shape.

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

7. The plastic-covered vehicle-mounted camera module of claim 6, wherein: the heat dissipation shield (6) has a concave escape portion having a size and shape matching a convex shape formed by electronic components mounted on a side of the circuit board in the imaging circuit board group (21) close to the rear cover (32), at a top surface away from the rear cover (32), in a parallel range equal to a base member area of the circuit board in the imaging circuit board group (21) close to the rear cover (32);

a spacing distance gap (A) is arranged between a concave avoidance part of the heat dissipation shielding piece (6) and a side surface protruding part, close to the rear cover (32), of a circuit board, close to the rear cover (32), in the imaging circuit board group (21) of the imaging module (2).

8. The plastic-covered vehicle-mounted camera module of claim 7, wherein: the heat dissipation shielding piece (6) with it is side clearance (B) to hold to be equipped with the clearance between the intracavity wall internal surface side clearance (B) within range, the top surface of heat dissipation shielding piece (6) to the internal surface direction extension of protecgulum (31) diapire, and with set up top clearance (C) between the internal surface of protecgulum (31) diapire.

9. The plastic-shelled vehicle-mounted camera module of claim 8, characterized in that: the heat dissipation shield (6) is made of metal.

10. The plastic-shelled vehicle-mounted camera module of claim 9, characterized in that: the heat dissipation shielding piece (6) and the imaging module (2) are communicated and grounded through the grounding contact point.

11. The plastic-covered vehicle-mounted camera module of claim 10, wherein: a through hole is formed in the cover wall of the rear cover (32), and the edge of the through hole is matched with the outer connector (5); the installation cover (37) does the local outside protruding drum that sets up of diapire of protecgulum, installation cover (37) are equipped with the internal thread, lens subassembly (1) surface is provided with the external screw thread, lens subassembly (1) with installation cover (37) threaded connection, installation cover (37) with protecgulum (31) are integrative structure.

12. The plastic-covered vehicle-mounted camera module of claim 10, wherein: the mounting sleeve (37) arranged on the front cover (31) needs to be communicated with the inside of the containing cavity, and the mounting sleeve (37) and the front cover (31) are of a split structure.

13. The plastic-covered vehicle-mounted camera module according to claim 11 or 12, characterized in that: the matched end parts of the front cover (31) and the rear cover (32) can be matched, one matched end part is provided with a circle of convex ribs, the other matched end part is provided with a circle of grooves, and the convex ribs are in plug-in fit with the grooves; the outer shell (3) further comprises a sealing ring (33) which is arranged in the groove and is abutted to the convex rib.

14. The plastic-shelled vehicle-mounted camera module of claim 13, characterized in that: sealant is coated between the via hole of the rear cover (32) and the outer connector (5), and sealant is coated between the lens component (1) and the mounting sleeve (37).

15. The plastic-covered vehicle-mounted camera module of claim 10, wherein: the circuit boards of the imaging circuit board group (21) are electrically connected with each other through flexible circuit boards

Or the female connector electrical connection.

16. The plastic-shelled vehicle-mounted camera module of claim 15, characterized in that: the front cover (31) is provided with a positioning seat (34) used for fixing or limiting a protrusion or a groove of the imaging module, and the imaging circuit board group (21) is fixedly connected with the front cover (31) through the positioning seat (34).

17. The plastic-shelled vehicle-mounted camera module of claim 15, characterized in that: the rear cover (32) is provided with a positioning seat (34) used for fixing or limiting a bulge or a groove of the imaging module, and the imaging circuit board group (21) is fixedly connected with the rear cover through the positioning seat (34).

18. The plastic-covered vehicle-mounted camera module according to claim 16 or 17, wherein: the imaging circuit board group (21) and the heat dissipation shielding piece (6) are fixedly provided with a heat conduction assembly (4), and the heat conduction assembly (4) is made of heat conduction material silica gel or rubber.

19. The plastic-shelled vehicle-mounted camera module of claim 18, characterized in that: the heat conducting assembly (4) comprises a heat conducting pad (41), a large-area surface of the heat conducting pad (41) is attached to a circuit board in the imaging circuit board group (21) close to the direction of the rear cover (32), and the other large-area surface is attached to one end surface of the heat dissipation shielding piece (6).

20. The plastic-shelled vehicle-mounted camera module of claim 19, characterized in that: the end surface of the imaging circuit board group (21) connected with the heat conducting component (4) is in a plane shape which is in surface contact with the heat conducting component (4) and is in an outer shape matched with the heat conducting component (4).

21. The plastic-shelled vehicle-mounted camera module of claim 20, characterized in that: the end surface of the heat dissipation shielding piece (6) connected with the heat conducting component (4) is in a plane shape in surface contact with the heat conducting component (4) and is in an appearance matched with the heat conducting component (4).

22. The plastic-covered vehicle-mounted camera module of claim 1, wherein: and an insulating layer is arranged on the surface of the heat dissipation shielding piece (6).

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