Millimeter wave radar structure

Abstract

The utility model discloses a millimeter wave radar structure, which comprises an upper cover, a terminal seat, a PCB (printed circuit board), a radiating fin and a plurality of elastic blocks, the PCB is flatly laid in a groove of the terminal seat, a connecting terminal is arranged in the groove of the terminal seat, the PCB is connected with the connecting terminal, the radiating fin is stacked above the PCB, the plurality of elastic blocks are arranged at the top of the radiating fin, the upper cover is tightly pressed on the elastic blocks, and the elastic blocks are tightly pressed on the upper cover. The elastic block is compressed and presses down the radiating fin and the PCB, and the radiating fin and the PCB are tightly pressed in the terminal seat. The PCB is tightly pressed in the terminal seat through the elastic piece, the manufacturing tolerance and the accumulated assembly tolerance of all parts are absorbed by utilizing the elastic characteristic, the situation that the parts are damaged due to the fact that the stress of electronic components such as chips on the PCB is too large due to screw locking can be avoided, screw locking is not needed, and the number of the parts and the assembly cost are saved.

Description

Technical Field

[0001] The utility model relates to the field of radars, and particularly relates to a millimeter-wave radar structure. Background Art

[0002] Automobiles are the most commonly used, convenient and comfortable means of transportation today. With the improvement of people's requirements for the safety performance of automobiles, radar systems are widely used in the active safety control of intelligent driving vehicles. Currently, millimeter-wave radar sensors have become one of the mainstream sensors because of their moderate cost, strong environmental adaptability and good long-distance detection ability. A millimeter-wave radar usually includes a terminal block, an upper cover, a radar antenna PCB board, a heat sink, etc. In the traditional solution, the PCB board is fixed to the terminal block with screws. Since screwing will generate stress on the PCB board, further causing excessive stress on electronic components such as chips on the PCB board, resulting in device damage. In addition, there are many screw-locking workstations, and the cost of parts and assembly is high. Summary of the Utility Model

[0003] Aiming at the deficiencies of the prior art, the utility model provides a millimeter-wave radar structure, which does not require screwing, is convenient to assemble, and has low cost.

[0004] To achieve the above object, the utility model is realized by the following technical solutions:

[0005] A millimeter-wave radar structure includes an upper cover, a terminal block, a PCB board, a heat sink and a plurality of elastic blocks. The PCB board is laid flat in the groove of the terminal block. There are connecting terminals in the groove of the terminal block. The PCB board is connected to the connecting terminals. The heat sink is stacked above the PCB board. A plurality of elastic blocks are placed on the top of the heat sink. The upper cover is tightly pressed against the elastic blocks. The elastic blocks are compressed and press down the heat sink and the PCB board. The heat sink and the PCB board are tightly pressed into the terminal block.

[0006] Further, the elastic block has a horizontal part and a vertical part. The horizontal part and the vertical part are connected into an L shape. The horizontal part is located on the top surface of the heat sink and has an interference fit with the upper cover. The vertical part is inserted into the gap between the heat sink, the PCB board and the groove wall.

[0007] Further, there are support ribs for supporting the PCB board at the bottom of the groove of the terminal block. The groove and the PCB board are both square. All four sides of the PCB board are supported by the support ribs.

[0008] Further, there are a plurality of limiting ribs on the four groove walls of the groove. Each limiting rib cooperates to prevent the periphery of the heat sink and the periphery of the PCB board from contacting the groove wall.

[0009] Further, elastic blocks are provided at least at both ends in the length direction inside the groove of the terminal block.

[0010] Further, a thermal conductive gel or a thermal conductive gasket is provided on the side of the heat sink close to the PCB board, and the thermal conductive gel or the thermal conductive gasket is in direct contact with the PCB board.

[0011] Further, the upper cover is provided with ventilation holes, and a waterproof breathable membrane is provided on the bottom surface of the upper cover to cover the ventilation holes.

[0012] Further, the size of the upper cover matches the size of the notch of the groove of the terminal block. The upper cover is docked with the terminal block, and the two are laser welded.

[0013] The utility model has the following beneficial effects:

[0014] 1. The PCB board is tightly pressed in the terminal block by the elastic member. By using the elastic characteristics, the manufacturing tolerances of all components and the cumulative assembly tolerances are absorbed, which can avoid excessive stress on components such as chips on the PCB board caused by screwing, resulting in device damage.

[0015] 2. The PCB board, the heat sink and the elastic member are stacked. When the upper cover and the terminal block are assembled in place, the fixing of the PCB board and the heat sink is completed, saving the assembly process.

[0016] 3. There is no need to screw, saving the number of components and the assembly cost. Description of the Drawings

[0017] Figure 1 is a schematic structural diagram of the millimeter-wave radar structure according to the embodiment of the utility model;

[0018] Figure 2 is Figure 1 a cross-sectional view of the millimeter-wave radar structure;

[0019] Figure 3 is Figure 1 an exploded view of the millimeter-wave radar structure;

[0020] Figure 4 is a top view of the terminal block;

[0021] Figure 5 is a three-dimensional view of the terminal block. Detailed Embodiment

[0022] The following further describes the utility model in conjunction with the drawings and embodiments.

[0023] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "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 utility model 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, and therefore should not be construed as a limitation to the present utility model.

[0024] As Figures 1 to 5 shown, this embodiment discloses a millimeter-wave radar structure, which includes an upper cover 1, a terminal block 2, a PCB board 3, a heat sink 4, and a plurality of elastic blocks 5. The PCB board 3 is laid flat in the groove of the terminal block 2. A connecting terminal 6 is provided in the groove of the terminal block 2. The PCB board 3 is connected to the connecting terminal 6 (specifically, the through hole 8 on the PCB board 3 is sleeved on the pin 7 of the connecting terminal 6 and the two are welded or crimped). The heat sink 4 is stacked above the PCB board 3. A plurality of elastic blocks 5 are placed on the top of the heat sink 4. The upper cover 1 is tightly pressed against the elastic blocks 5. The elastic blocks 5 are compressed and press down the heat sink 4 and the PCB board 3. The heat sink 4 and the PCB board 3 are tightly pressed into the terminal block 2. An antenna for transmitting and receiving signals is provided on the PCB board 3. The terminal block 2 is a plastic antenna cover, and the upper cover 1 is a plastic part. Different from the traditional solution of locking the PCB board 3 in the terminal block 2 with screws, in this solution, the PCB board 3 is tightly pressed in the terminal block 2 by an elastic member. The elastic member is compressed and has an interference fit between the heat sink 4 and the upper cover 1. By using the elastic characteristics, the manufacturing tolerances of all components and the cumulative assembly tolerances are absorbed, avoiding excessive stress on components such as chips on the PCB board 3 and causing device damage.

[0025] A thermal gel or thermal pad 9 is provided on the side of the heat sink 4 close to the PCB board 3. The thermal gel or thermal gel 9 is in direct contact with the PCB board 3, so as to quickly transfer the heat on the PCB board 3 to the heat sink 4 for heat dissipation through the thermal gel or thermal pad 9.

[0026] The upper cover 1 is provided with a ventilation hole 10. A waterproof breathable film 11 is fixed to the bottom surface of the upper cover 1 by adhesive or ultrasonic welding to cover the ventilation hole 10. The size of the upper cover 1 matches the size of the notch of the groove of the terminal block 2. The upper cover 1 is docked with the terminal block 2, and the two are assembled by laser welding. In other embodiments, the upper cover 1 and the terminal block 2 may also have other connection methods. For example, it is not excluded that the upper cover 1 may also be connected to the terminal block 2 by a snap structure or other methods and sealed with a sealant.

[0027] On one side of the bottom of the groove towards which the PCB board 3 faces, electrical components are assembled. To avoid the electrical components from being squeezed, a certain gap is required between the PCB board 3 and the bottom of the groove. In this embodiment, support ribs 12 for supporting the PCB board 3 are provided at the bottom of the groove of the terminal block 2. Specifically, both the groove and the PCB board 3 are square, and support ribs 12 are provided at both ends in the length direction and both ends in the width direction of the groove. All four sides of the PCB board 3 are supported by the support ribs 12. A number of limiting ribs 13 are provided on all four groove walls of the groove. Each limiting rib 13 cooperates to prevent the heat sink 4 and the PCB board 3 from contacting the groove wall around the perimeter, creating a gap between the heat sink 4 and the PCB board 3 and the groove wall, avoiding the heat sink 4 and the PCB board 3 from being impacted by the groove wall during radar use, and also facilitating heat dissipation.

[0028] The elastic block 5 in this embodiment includes, but is not limited to, a rubber pad and an elastic cushion block made of a composite material. In this embodiment, the elastic block is preferably a rubber pad. The upper cover is provided with protrusions at positions corresponding to the elastic blocks. By pressing the elastic blocks tightly with the protrusions, the elastic blocks are in interference fit with the gaps between the protrusions and the heat sink. The elastic block 5 can be flat-shaped and is used to absorb manufacturing tolerances and assembly tolerances in the vertical direction. As a preferred solution, the elastic block 5 in this embodiment has a horizontal portion 51 and a vertical portion 52. The horizontal portion 51 and the vertical portion 52 are connected to form an L shape. The horizontal portion 51 is located on the top surface of the heat sink 4 and is in interference fit with the upper cover, and the vertical portion 52 is inserted into the gap between the heat sink 4 and the PCB board 3 and the groove wall, preventing the heat sink 4 and the PCB board 3 from contacting the groove wall.

[0029] In this embodiment, elastic blocks 5 are provided at both ends in the length direction inside the groove of the terminal block 2 to prevent the PCB board 3 and the heat sink 4 from displacing in the length direction and colliding with the terminal block 2. There are gaps between the two sides in the width direction of the groove and the PCB board 3 and the heat sink 4, which is conducive to heat dissipation. In other embodiments, elastic blocks 5 can also be provided on both sides in the width direction of the groove, and the length of the elastic block 5 should be less than the length of the groove to reserve a heat dissipation gap.

[0030] For the radar in this embodiment, after the upper cover presses the rubber pad, it directly fixes the PCB board and the heat sink. An interference fit is used with the rubber pad, and the elastic characteristics of the rubber pad are utilized to absorb the manufacturing tolerances of the components and the cumulative assembly tolerances. The radar assembly method is as follows:

[0031] Step 1: The terminal block and the PCB board form a first component;

[0032] Step 2: The heat sink is placed on the PCB board to form a second component;

[0033] Step 3: The rubber pad is placed at both ends of the heat sink to form a third component;

[0034] Step 4: The upper cover is pasted with a waterproof and breathable film to form an intermediate component;

[0035] Step Five: The third component and the intermediate component are plastic laser welded to form a finished component.

[0036] As described above, the embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention. Therefore, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

Claims

1. A millimeter wave radar structure, characterized in that: It includes an upper cover, a terminal seat, a PCB board, a heat sink and several elastic blocks. The PCB board is laid flat in the groove of the terminal seat. A connecting terminal is provided in the groove of the terminal seat. The PCB board is connected to the connecting terminal. The heat sink is stacked above the PCB board. Several elastic blocks are placed on the top of the heat sink. The upper cover is tightly pressed on the elastic blocks. The elastic blocks are compressed and press down the heat sink and the PCB board. The heat sink and the PCB board are tightly pressed in the terminal seat.

2. The millimeter wave radar structure according to claim 1, characterized in that: The elastic block has a horizontal portion and a vertical portion, which are connected to form an L shape. The horizontal portion is located on the top surface of the heat sink and has an interference fit with the upper cover, and the vertical portion is inserted into the gap between the heat sink and the PCB board and the groove wall.

3. The millimeter wave radar structure according to claim 1, characterized in that: The bottom of the groove of the terminal seat is provided with supporting ribs for supporting the PCB board. The groove and the PCB board are both square, and the four sides of the PCB board are supported by the supporting ribs.

4. The millimeter wave radar structure according to claim 3, characterized in that: The four groove walls of the groove are all provided with a plurality of limiting ribs, and the limiting ribs cooperate to prevent the surrounding areas of the heat sink and the surrounding areas of the PCB board from contacting the groove wall.

5. The millimeter wave radar structure according to claim 2 or 3, characterized in that: At least elastic blocks are provided at two ends in the length direction of the interior of the terminal seat groove.

6. The millimeter wave radar structure according to claim 1, characterized in that: A heat conducting gel or a heat conducting pad is arranged on one side of the heat sink close to the PCB board, and the heat conducting gel or the heat conducting pad is in direct contact with the PCB board.

7. The millimeter wave radar structure according to claim 1, characterized in that: The upper cover is provided with ventilation holes, and the bottom surface of the upper cover is provided with a waterproof and breathable membrane covering the ventilation holes.

8. The millimeter wave radar structure according to claim 1, characterized in that: The size of the upper cover matches the size of the notch of the groove of the terminal seat, and the upper cover is butted against the terminal seat, and the two are welded by laser.

Images