Vehicle-mounted camera

Abstract

The utility model discloses a vehicle-mounted camera, and relates to the technical field of cameras. The shell comprises a front shell and a rear shell which are fixed through welding, an installation space is formed between the front shell and the rear shell, a circuit board is arranged in the installation space, a plurality of structural parts are fixedly connected to the side, close to the circuit board, of the front shell, a plurality of yielding holes are formed in the circuit board, and each yielding hole is used for allowing the corresponding structural part to penetrate through in a clearance mode; a plurality of to-be-fused pieces with preset heat conductivity coefficients are arranged on the side, away from the front shell, of the circuit board, each to-be-fused piece is arranged on the outer side wall of the corresponding structural piece, and the to-be-fused pieces are heated so that gaps between the corresponding structural pieces and the yielding holes can be partially filled with the fused to-be-fused pieces. And then the molten to-be-fused piece is cooled to fixedly connect the structural piece and the circuit board, so that the to-be-fused piece can transmit heat of the front shell when the front shell and the rear shell are welded, and the temperatures of all parts of the to-be-fused piece are relatively balanced, so that the to-be-fused piece is kept stable, and the structural piece and the circuit board are stably connected.

Description

Technical Field

[0001] This application relates to the technical field of cameras, and particularly to a vehicle-mounted camera. Background Art

[0002] As the pixel of vehicle-mounted cameras gets higher and higher, the power consumption of the cameras is also increasing, and the requirement for heat dissipation is gradually rising. The plastic housing can no longer meet the heat dissipation requirements, and each module manufacturer has adopted an aluminum alloy housing to cope with it.

[0003] Currently, there is a vehicle-mounted camera in the prior art, which includes a front housing and a rear housing made of aluminum alloy. The front housing and the rear housing are fixed together by welding. An installation space is formed between the front housing and the rear housing, and a circuit board is installed in the installation space through glue. However, it is found in the actual measurement process that when welding the front housing and the rear housing, since the melting point of the metal is above 600 °C, and the thermal conductivity of aluminum alloy is 237 (W / (m·K)), the heat generated by welding will quickly conduct to the glue. The main component of the glue is epoxy resin, and its thermal conductivity is less than 1 (W / (m·K)). The heat of the aluminum alloy cannot conduct to the glue, resulting in the temperature rise on the side of the glue far from the circuit board, which causes deformation or even melting on this side, and ultimately affects the installation stability of the circuit board in the installation space.

[0004] Therefore, there is an urgent need for a technology that can keep the circuit board stably installed in the installation space. Utility Model Content

[0005] This application provides a vehicle-mounted camera, which can solve the problem of unstable installation of the circuit board in the installation space in the prior art.

[0006] To solve the above one or more technical problems, the technical solution adopted in this application is:

[0007] In a first aspect, this application provides a vehicle-mounted camera, including a front housing and a rear housing. The front housing and the rear housing are fixed by welding. An installation space is formed between the front housing and the rear housing. A circuit board is provided in the installation space. A plurality of structural members are fixedly connected to the side of the front housing close to the circuit board. A plurality of yield holes are formed in the circuit board, and each yield hole is used for a corresponding one of the structural members to pass through with a gap.

[0008] A plurality of fuse members with a preset thermal conductivity are provided on the side of the circuit board far from the front housing, and each fuse member is disposed on the outer sidewall of the corresponding structural member.

[0009] In a first state, all the fuse members are heated and melted and partially enter the corresponding yield holes to fill the gaps between the corresponding structural members and the yield holes.

[0010] In the second state, the molten workpiece to be melted cools and solidifies to fixedly connect the corresponding structural member and the circuit board.

[0011] Furthermore, the workpiece to be melted is a single component, and is sleeved on the outer side wall of the corresponding structural member after the structural member is installed in the relief hole.

[0012] Furthermore, the workpiece to be melted is obtained by molding or winding.

[0013] Furthermore, the structural member is riveted or threadedly connected to the front shell.

[0014] Furthermore, before the workpiece to be melted is heated and melted, it is in an annular shape and is sleeved on the outer side wall of the corresponding structural member.

[0015] Furthermore, a metal coating is provided at the position where the workpiece to be melted contacts the circuit board and in the relief hole. Furthermore, the inner side wall of the workpiece to be melted is in line contact with the outer side wall of the structural member.

[0016] Furthermore, the ratio of the thermal conductivity coefficients between the front shell and the workpiece to be melted is greater than 1 and less than 4.

[0017] Furthermore, a first annular groove is provided at the end edge of the front shell close to the rear shell, a second annular groove is provided at the end edge of the rear shell close to the front shell, and a reserved space is formed between the first annular groove and the second annular groove.

[0018] Furthermore, the composition of the workpiece to be melted includes one of metals with a melting point lower than 240 °C.

[0019] In a second aspect, the present application also provides an installation method for a vehicle-mounted camera, including:

[0020] Step 1, fixedly installing a plurality of structural members in the front shell;

[0021] Step 2, placing the circuit board in the installation space formed by the front shell and the rear shell, and respectively passing a structural member through each relief hole on the circuit board with a gap, and placing the workpiece to be melted with a preset thermal conductivity on the outer side wall of each structural member;

[0022] Step 3, heating the workpiece to be melted for a first preset time to melt it and partially enter the relief hole;

[0023] Step 4, cooling the melted workpiece to be melted for a second preset time to fixedly connect the structural member and the circuit board;

[0024] Step 5, assembling the front shell and the rear shell, and welding the front shell and the rear shell.

[0025] Furthermore, after all the clearance holes on the circuit board are respectively provided with a structure, the to-be-melted component with a preset thermal conductivity is sleeved on the outer wall of each structure.

[0026] Furthermore, the method of heating the workpiece to be melted includes non-contact heating, and the non-contact heating includes laser irradiation.

[0027] Furthermore, the installation method also includes:

[0028] Before assembling the front shell and the rear shell, the oxide layer at the welding position of the front shell and the rear shell is removed.

[0029] Furthermore, after completing step 2, the circuit board and the front shell including the lens are focused, and after the focusing is completed, step 3 is performed.

[0030] According to the specific embodiments provided in this application, this application discloses the following technical effects:

[0031] The structure is first fixedly connected to the front shell, and then the structure is passed through the circuit board through the clearance hole, and a to-be-melted part with a preset thermal conductivity is placed on the side of the circuit board away from the front shell, and then the to-be-melted part is heated so that the melted to-be-melted part partially enters the clearance hole to fill the corresponding gap between the structure and the clearance hole, and then the melted to-be-melted part is cooled to fix the connection between the structure and the circuit board, so that the to-be-melted part can transfer the heat of the front shell when welding the front shell and the rear shell, and keep the temperature of each part of the to-be-melted part relatively balanced, so that the to-be-melted part is kept stable, and the structure and the circuit board are stably connected, so that the circuit board is stably installed in the installation space;

[0032] Furthermore, by providing a first annular groove at the end edge of the front shell close to the rear shell, and providing a second annular groove at the end edge of the rear shell close to the front shell, after the front shell and the rear shell are attached to each other, a reserved space is formed between the first annular groove and the second annular groove, so as to leave space for protrusions that may be generated during welding, thereby preventing the protrusions from exceeding the edge of the front shell or the rear shell, thereby ensuring the uniformity of the appearance of the vehicle-mounted camera;

[0033] In addition, the parts to be melted in the present application are independent parts. Since the parts to be melted are solid, they have certain shape-retaining and anti-oxidation capabilities, and are mounted on the structural parts after the structural parts are installed in the clearance holes. This not only facilitates storage and turnover, but also makes the entire installation process more efficient and can greatly reduce the cost of the entire assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0035] Figure 1 Schematic structural diagram of the vehicle-mounted camera provided in Embodiment 1 of the present application;

[0036] Figure 2 Schematic structural diagram of the connection relationship between the structural member and the circuit board provided in Embodiment 1 of the present application;

[0037] Figure 3 Schematic diagram of the workpiece to be melted formed in a winding manner provided in Embodiment 1 of the present application;

[0038] Figure 4 Schematic diagram of the workpiece to be melted formed in a molding manner provided in Embodiment 1 of the present application;

[0039] Figure 5 Flowchart of the vehicle-mounted camera installation method provided in Embodiment 2 of the present application.

[0040] Reference numerals: 1, front housing; 11, first annular groove; 2, rear housing; 21, second annular groove; 3, optical lens; 4, circuit board; 41, yield hole; 5, structural member; 6, connector; 7, workpiece to be melted; 8, reserved space; 9, installation space. Detailed implementation manners

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, rather than all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present application.

[0042] As described in the background art, in the prior art, during the welding process of a vehicle-mounted camera, since the heat generated by welding will quickly conduct to the glue, and the thermal conductivity of the glue is less than 1 (W / (m·K)), the heat of the housing made of aluminum alloy cannot conduct to the side of the glue close to the circuit board, resulting in the temperature of the side of the glue far from the circuit board rising, thereby causing deformation or even melting of this side, and ultimately affecting the stability of the circuit board installation.

[0043] To solve one or more of the above technical problems in the prior art, the present application creatively proposes an in-vehicle camera and an installation method. By opening a yielding hole in the circuit board, passing a structural member fixedly connected to the front shell through the yielding hole, arranging a meltable member on the side of the circuit board away from the front shell, placing the meltable member on the outer side wall of the structural member, then the meltable member is heated and melted to enter the gap between the structural member and the yielding hole and fill the gap. After the meltable member cools and solidifies, the fixation of the circuit board and the structural member is achieved. When the front shell and the rear shell are subsequently laser welded, the heat of the front shell can be conducted to the meltable member through the structural member, making the heat on the relatively two sides of the meltable member along the axial direction of the structural member similar, avoiding the accumulation of heat on one side causing melting on one side, thereby avoiding affecting the connection stability between the circuit board and the structural member and enabling the circuit board to be stably installed in the installation space.

[0044] The following specifically describes the in-vehicle camera and the installation method according to the embodiments of the present application with reference to the accompanying drawings.

[0045] Embodiment 1

[0046] Embodiment 1 of the present application provides an in-vehicle camera. Referring to Figure 1 as shown, it includes a front shell 1 and a rear shell 2. An optical lens 3 is integrally formed inside the front shell 1. The front shell 1 and the rear shell 2 are fixed by welding. After the front shell 1 and the rear shell 2 are fitted together, an installation space 9 is formed. A circuit board 4 is arranged in the installation space. A plurality of structural members 5 are fixedly connected to the side of the front shell 1 close to the circuit board 4. The circuit board 4 is provided with a plurality of yielding holes 41, and each yielding hole 41 is used for the corresponding structural member 5 to pass through with a gap. Photoelectric exchange is carried out between the optical lens 3 and the circuit board 4. The circuit board 4 is connected with a connector 6 for electrical signal communication with the outside.

[0047] Referring to Figure 1 and Figure 2 as shown, a plurality of meltable members 7 with a preset thermal conductivity are arranged on the side of the circuit board 4 away from the front shell 1. Each meltable member 7 is arranged on the outer side wall of the corresponding structural member 5. In the first state, all the meltable members 7 are heated and melted and partially enter the corresponding yielding holes 41 to fill the gap between the corresponding structural member 5 and the yielding hole 41. In the second state, the melted meltable members 7 cool and solidify to fixedly connect the corresponding structural member 5 and the circuit board 4. Preferably, the ratio of the thermal conductivity between the front shell 1 and the meltable member 7 is greater than 1 and less than 4. Specifically, in this embodiment, the front shell 1 is made of aluminum alloy, the thermal conductivity of the aluminum alloy is 237 (W / (m·K)), and the meltable member 7 selects tin, and the thermal conductivity of tin is 67 (W / (m·K)), so as to better conduct the heat from the front shell 1 and the rear shell 2, make the temperature of the meltable member 7, the front shell 1 and the rear shell 2 balance as soon as possible, and reduce the deformation caused by the temperature difference.

[0048] Among them, the workpiece to be melted 7 can be made of one of the metals with a melting point lower than 240°C. It can be understood that the metals described here include alloys.

[0049] In the embodiment of the present application, the workpiece to be melted 7 is made of tin. However, it can be understood that tin is only an exemplary rather than restrictive description of the material of the workpiece to be melted 7 in this embodiment of the present application. Without departing from the inventive concept of the present application, any known type of material that meets the thermal conductivity requirements and is convenient for heating and melting can be used to manufacture the workpiece to be melted 7.

[0050] It should be noted that in order to keep the physical state of the workpiece to be melted 7 unchanged during the welding process, the melting point of the workpiece to be melted 7 needs to be higher than the temperature reached during the welding of the front shell 1 and the rear shell 2. For example, the melting point of tin is above 183°C, while the temperature will reach 100°C when the front shell 1 and the rear shell 2 made of aluminum alloy are welded, which will not affect the physical state of the workpiece to be melted 7.

[0051] Among them, the fixed connection methods between the front shell 1 and the structural member 5 include riveting or threaded connection. In this embodiment, the connection method between the front shell 1 and all the structural members 5 is threaded connection. It should be noted that the number of structural members 5 is not less than two, and in order to make the tightening force evenly distributed and keep the connection between the circuit board 4 and the front shell 1 stable after long-term use, the number of structural members 5 is set to an even number, and at the same time, the corresponding two structural members 5 are symmetrically centered on the axis of the circuit board 4, so that the structural members 5 can be tightened in the diagonal tightening order when tightening.

[0052] As an implementation method, referring to Figure 2 As shown, the structural member 5 is integrally cylindrical, and the part thereof connected to the front shell 1 is provided with an external thread, and the inner wall of the front shell 1 is provided with an equal number of internal thread holes for partially screwing in the structural member 5. After the structural member 5 is fixedly connected to the front shell 1, the non-threaded end of the structural member 5 is passed through the corresponding relief hole 41, and the frictional force between the structural member 5 and the circuit board 4 can keep the circuit board 4 relatively stable.

[0053] Furthermore, after the circuit board 4 and the structural member 5 are initially fixed, an external device is used to heat the workpiece to be melted 7. After the workpiece to be melted 7 is heated and melted, the melted workpiece to be melted 7 partially enters the relief hole 41, thereby filling the gap between the corresponding structural member 5 and the relief hole 41. Then, the heating of the workpiece to be melted 7 is stopped, and then the melted workpiece to be melted 7 can be cooled by natural cooling or air cooling, so that the melted workpiece to be melted 7 gradually cools and solidifies, making the structural member 5 and the circuit board 4 become an integral body through the workpiece to be melted 7, thereby fixedly connecting the structural member 5 and the circuit board 4.

[0054] In an embodiment of the present application, the meltable part 7 is an independent component. After the structural component 5 is installed into the clearance hole 41, it is sleeved on the structural component 5. Preferably, as Figure 3 and 4 shown, the meltable part 7 can be obtained by molding or winding, and its outer shape can have different forms.

[0055] Since the meltable part 7 is an independent component, after the circuit board 4 and the front lens housing 1 are focused, it is installed on the structural component 5 by a manipulator and then melted, which can realize on-line assembly production in a pipeline, with high production efficiency, great flexibility and cost savings. In the prior art, solder paste needs to be printed on the circuit board in advance. If the circuit board is defective, the printed solder paste needs to be scrapped and cannot be reused; if the printed solder paste is defective, the circuit board needs to be printed with solder paste offline again, with a long cycle and high rework cost.

[0056] Moreover, for storage and turnover, the meltable part 7 of the present application can be packaged in a woven bag, which effectively protects the outer shape of the meltable part 7 and controls the temperature and humidity. At the same time, the meltable part 7 is a solid, with a certain shape retention ability and antioxidant ability. The solder paste printed offline is in a paste form. After the circuit board is printed with solder paste, it needs to be stored and turned over together with the circuit board. Limited by the volume, it needs to be protected with the circuit board, resulting in high storage cost; at the same time, the solder paste is easily damaged during the turnover of workstations, and the rework cost is high.

[0057] Referring to Figure 1 and Figure 2 shown, before the meltable part 7 is heated and melted, it is in a circular ring shape and sleeved on the outer side wall of the corresponding structural component 5. To reduce the melting time and improve the connection efficiency, the inner side wall of the meltable part 7 is in line contact with the outer side wall of the structural component 5, thereby shortening the path for the meltable part 7 in the molten state to flow into the clearance hole 41. At the same time, there is a space between the inner wall of the meltable part 7 and the clearance hole 41, which is convenient for the meltable part 7 in the molten state to flow, thereby shortening the time for the meltable part 7 in the molten state to flow into the clearance hole 41.

[0058] Furthermore, the cross-section of the meltable part 7 along the axial direction of the clearance hole 41 is circular. When heating the meltable part 7, the outer side wall of the meltable part 7 melts first and gradually collapses towards the direction close to the circuit board 4, and gradually forms a relatively stable triangle. Almost at the same time, the inner side wall of the meltable part 7 starts to melt and gradually flows into the clearance hole 41 under the influence of gravity, and finally forms a stable structure, and the cross-section of this structure along the axial direction of the structural component 5 is in a shape similar to an isosceles trapezoid.

[0059] Furthermore, a metal solderable process is performed on the position where the meltable part 7 contacts the circuit board 4 and inside the hole to form a metal coating, including but not limited to tin spraying, gold plating, silver plating, immersion gold, nickel plating, etc. Such a design can form a better adhesion ability at the position where the meltable part 7 contacts after melting, so that the welding strength is higher.

[0060] Further, a first annular groove 11 is provided at the end edge of the front housing 1 close to the rear housing 2, and a second annular groove 21 is provided at the end edge of the rear housing 2 close to the front housing 1. A reserved space 8 is formed between the first annular groove 11 and the second annular groove 21. When welding the front housing 1 and the rear housing 2, the part where the front housing 1 and the rear housing 2 are in contact will melt, and the melted part may flow radially along the front housing 1. Part of the melted front housing 1 and / or rear housing 2 overflows into the reserved space 8 and solidifies to form a protrusion. The setting of the reserved space 8 can ensure that the protrusion does not exceed the outer wall edge of the front housing 1 and the rear housing 2, thereby improving the appearance uniformity of the vehicle-mounted camera.

[0061] Embodiment 2

[0062] Corresponding to the above Embodiment 1, the present application also provides an installation method for a vehicle-mounted camera. In this embodiment, the same or similar content as that in the above Embodiment 1 can be referred to the above introduction and will not be elaborated hereinafter. Referring to Figure 5 shown, the method includes:

[0063] S100. Fix and install several structural members inside the front housing 1.

[0064] Specifically, referring to Figure 1 and Figure 2 shown, partially screw a structural member 5 into the internal thread hole of the front housing 1, and then screw another structural member 5 into the corresponding internal thread hole according to the diagonal principle, so as to ensure that the connection force between all subsequent structural members 5 and the circuit board 4 remains consistent.

[0065] S200. Place the circuit board in the installation space formed by the front housing 1 and the rear housing 2, and respectively pass a structural member 5 through all the yield holes on the circuit board 4 with a gap, and place a melting member to be melted on the outer side wall of each structural member 5;

[0066] Specifically, align each yield hole 41 on the circuit board 4 with the corresponding yield hole 41, pass the structural member 5 through the corresponding yield hole 41, and make a part of the structural member 5 extend out of the circuit board 4, and then place the melting member to be melted 7 on the outer side wall of the structural member 5, so that after the melting member to be melted 7 melts, it flows into the gap between the structural member 5 and the yield hole 41.

[0067] Preferably, before being heated and melted, the melting member to be melted 7 is in an annular shape, and the inner annular wall of the melting member to be melted 7 is in line contact with the outer side wall of the structural member 5, and the melting member to be melted 7 can be directly sleeved on the structural member 5, so that the melting member to be melted 7 remains relatively stable during the melting process.

[0068] Preferably, after completing S200, focus on the circuit board 4 and the front housing 1 including the lens. After completing the focusing, perform S300.

[0069] S300. Heat the fuse to a first preset time to melt it and partially enter the relief hole.

[0070] Specifically, heat the fuse 7 by contact or non-contact heating, and maintain the heating for a period of time to meet the requirement of the first preset time, so that the melting degree of the fuse 7 meets the requirement and fully enters the gap between the structural member 5 and the relief hole 41, thereby improving the connection strength between the circuit board 4 and the structural member 5.

[0071] Preferably, in this embodiment, the non-contact heating method is selected, specifically using laser irradiation. At the same time, the multi-path laser irradiation method can be adopted so that all the fuses 7 can be melted and solidified simultaneously, improving the connection strength between the structural member 5 and the circuit board 4.

[0072] S400. Cool the melted fuse to a second preset time to fix the connection between the structural member and the circuit board.

[0073] Specifically, after stopping heating the fuse 7, let the structural member 5, the fuse 7, the circuit board 4, and the front shell 1 stand for a period of time until the requirement of the second preset time is met, so that the melted fuse 7 cools sufficiently and solidifies again, thereby improving the connection strength between the structural member 5 and the circuit board 4 and the flatness of the fuse 7.

[0074] In this embodiment, natural cooling or air cooling can be adopted. When adopting the air cooling method, the multi-angle and one-to-one cooling method can be used to improve the cooling rate. At the same time, attention should be paid to the air cooling intensity to maintain the shape of the fuse 7.

[0075] S500. Assemble the front shell and the rear shell, and weld the front shell and the rear shell.

[0076] Specifically, align the welding surface of the front shell 1 with the welding surface of the rear shell 2, and then use laser to weld along the circumference of the welding surface of the front shell 1 and the rear shell 2 to ensure the fixing strength and sealing between the front shell 1 and the rear shell 2.

[0077] It should be noted that the welding surface refers to the surface where the front shell 1 and the rear shell 2 are in contact when assembled.

[0078] Preferably, before assembling the front shell 1 and the rear shell 2, a first annular groove 11 can be machined by CNC turning on the edge of the welding surface of the front shell 1, and a second annular groove 21 can be machined by CNC turning on the edge of the welding surface of the rear shell 2. The first annular groove 11 and the second annular groove 21 support to form a reserved space 8 to leave space for the possible overflow of the welding surface of the front shell 1 and the rear shell 2. At the same time, when machining the groove, the oxide layer on the welding surface of the front shell 1 and the rear shell 2 needs to be removed to reduce the probability of explosion holes during the welding process.

[0079] Among them, laser sintering can also be used to process the first annular groove 11 and the second annular groove 21.

[0080] The above has introduced in detail a vehicle-mounted camera and an installation method provided by the present application. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application; at the same time, for those of ordinary skill in the art, based on the idea of the present application, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present application.

[0081] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "vertical", "parallel", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation to the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise stated, the meaning of "a plurality" is two or more.

[0082] In the description of the present application, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0083] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A vehicle-mounted camera, comprising a front shell and a rear shell, wherein the front shell and the rear shell are fixed by welding, and an installation space is formed between the front shell and the rear shell, characterized in that: The installation space is provided with a circuit board, a side of the front shell close to the circuit board is fixedly connected with a plurality of structural members, the circuit board is provided with a plurality of clearance holes, and each of the clearance holes is used for a corresponding gap of the structural member to pass through; A plurality of to-be-melted parts with a preset thermal conductivity are provided on one side of the circuit board away from the front shell, wherein the to-be-melted parts are separate parts and are sleeved on the corresponding outer side wall of the structural part after the structural part is installed to the clearance hole; In the first state, all the parts to be melted are melted by heat and partially enter the corresponding clearance holes to fill the gaps between the corresponding structural parts and the clearance holes; In the second state, the melted component to be melted cools and solidifies to fixedly connect the corresponding structural component and the circuit board.

2. The vehicle-mounted camera according to claim 1, characterized in that: The inner side wall of the to-be-melted component is in line contact with the outer side wall of the structural component.

3. The vehicle-mounted camera according to claim 2, characterized in that: The to-be-melted piece is in a circular shape before being heated and melted.

4. The vehicle-mounted camera according to claim 3, characterized in that: The to-be-melted part is obtained by molding or winding.

5. The vehicle-mounted camera according to any one of claims 1 to 4, characterized in that: The composition of the to-be-melted part includes one of the metals with a melting point lower than 240°C.

6. The vehicle-mounted camera according to any one of claims 1 to 4, characterized in that: The thermal conductivity ratio between the front shell and the part to be melted is greater than 1 and less than 4.

7. The vehicle-mounted camera according to any one of claims 1 to 4, characterized in that: The structural member is connected to the front shell by riveting or threading.

8. The vehicle-mounted camera according to any one of claims 1 to 4, characterized in that: A metal coating is provided at the position where the to-be-melted component contacts the circuit board and in the clearance hole.

9. The vehicle-mounted camera according to any one of claims 1 to 4, characterized in that: The front shell has a first annular groove at its end edge close to the rear shell, and the rear shell has a second annular groove at its end edge close to the front shell. A reserved space is formed between the first annular groove and the second annular groove.

Images