Waveguide antenna structure based on laser welding
By adopting laser welding technology in the waveguide antenna structure, the problem of poor welding of waveguide antennas is solved, stable combination and efficient welding of waveguide plates are achieved, and product quality and signal stability are improved.
Patent Information
- Application Number
- CN202421788562.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-25
- Publication Date
- 2025-07-04
- Estimated Expiration
- 2034-07-25
AI Technical Summary
The existing waveguide antennas have problems such as poor solderability and poor welding during the welding process, especially due to the high furnace temperature and uneven tin filling thickness, which leads to plate curling and gaps, which affects the stability of the antenna signal and product yield.
By using laser welding technology, by setting a laser welding zone on the upper and lower waveguide plates, the non-contact thermal effect of laser welding is used to locally heat and fuse the upper and lower waveguide plates to ensure that there is no gap between the two and the bonding surface is stable.
Laser welding controls the deformation of the waveguide plate, ensures the stability of the joint surface of the waveguide cavity, prevents signal leakage, improves product yield, and improves welding efficiency and cleanliness.
Smart Images
Figure CN223066459U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of waveguide antennas, and particularly relates to a waveguide antenna structure based on laser welding. Background Art
[0002] With the development of vehicle-mounted millimeter-wave radars towards 4D imaging radars, the performance requirements for antennas are gradually increasing. The current 4D millimeter-wave radar antennas are designed based on PCB antennas, which are limited by the antenna size, the number of antenna channels, and the length of the antenna feeder. In the future, they will not be able to meet the development needs of long-distance detection of 4D millimeter-wave radars. Therefore, applying waveguide antennas to 4D millimeter-wave radars can greatly improve the detection performance of the radar itself.
[0003] The current waveguide antennas are composed of 2 - 3 layers. To ensure good splicing of each layer, special processes are required to combine each layer of the waveguide antenna.
[0004] Most of the current waveguide antennas use SMT welding technology to ensure communication with each other. However, during the SMT welding process, due to the high furnace temperature and uneven tin filling thickness, it is easy to cause board warping and gaps, resulting in poor welding. Summary of the Utility Model
[0005] The purpose of the utility model is to solve the problems of poor weldability and poor welding of existing waveguide antennas. For this reason, a waveguide antenna structure based on laser welding is provided.
[0006] In order to achieve the above purpose, the technical solutions adopted by the utility model are as follows:
[0007] A waveguide antenna structure based on laser welding, including an upper waveguide plate and a lower waveguide plate. The upper waveguide plate is set as a light-transmitting member, the lower waveguide plate is set as a light-absorbing member. An upper laser welding area is arranged on the upper waveguide plate, and a lower laser welding area is arranged on the lower waveguide plate. The upper laser welding area and the lower laser welding area are arranged corresponding to each other up and down and are laser welded.
[0008] The following is a further limited technical solution of the utility model. The surface layer of the upper waveguide plate is set as a metal coating, and the upper laser welding area does not include the metal coating; the surface layer of the lower waveguide plate is set as a metal coating, and the lower laser welding area does not include the metal coating.
[0009] The following is a further limited technical solution of the utility model. The front and back sides of the upper waveguide plate are both provided with upper laser welding areas, and the front side of the lower waveguide plate is provided with a lower laser welding area.
[0010] The following is a further limited technical solution of the utility model. The upper laser welding area is set as a concave area, and the lower laser welding area is set as a convex area.
[0011] The following is a further defined technical solution of the present utility model. Before welding, the distance between the metal plating areas of the upper waveguide plate and the lower waveguide plate is 0.2 mm - 0.5 mm for both the upper laser welding area and the lower laser welding area.
[0012] The following is a further defined technical solution of the present utility model. The melting depth of laser welding for both the upper laser welding area and the lower laser welding area is 0.2 mm - 0.5 mm, and after welding, the metal plating areas of the upper waveguide plate and the lower waveguide plate are in mutual contact and fit.
[0013] Compared with the prior art, the present utility model has the following technical effects:
[0014] 1. Non-contact laser welding causes local heating of the waveguide plate, which is beneficial to controlling the deformation of the waveguide plate, ensuring the stability of the waveguide cavity joint surface, strictly controlling the gap between the upper and lower layers, preventing antenna signal leakage, and improving the product yield;
[0015] 2. The laser welding has a relatively high energy density, can quickly reach the optimal welding temperature of the plastic joint surface, and ensures the welding efficiency and precision;
[0016] 3. Compared with SMT welding, laser welding does not require filling auxiliary materials (such as solder paste), which is beneficial to improving the cleanliness of the product.
[0017] The following further illustrates the present utility model in conjunction with the accompanying drawings and embodiments. Description of the Drawings
[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the accompanying drawings required for use in the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.
[0019] Figure 1 is a structural schematic diagram of the present utility model;
[0020] Figure 2 is a structural schematic diagram of the front side of the upper waveguide plate of the present utility model;
[0021] Figure 3 is a structural schematic diagram of the back side of the upper waveguide plate of the present utility model;
[0022] Figure 4 is a structural schematic diagram of the front side of the lower waveguide plate of the present utility model;
[0023] Figure 5 is a structural schematic diagram of the back side of the lower waveguide plate of the present utility model;
[0024] Figure 6 It is a schematic structural diagram before laser welding of the upper waveguide plate and the lower waveguide plate in the present utility model;
[0025] Figure 7 It is a schematic structural diagram after the upper waveguide plate and the lower waveguide plate in the present utility model are completed with laser welding;
[0026] Figure 8 It is a schematic partial structural diagram of laser welding of the upper waveguide plate and the lower waveguide plate in the present utility model;
[0027] Figure 9 and 10 11 is a schematic diagram of the laser welding principle of the present utility model.
[0028] Reference numerals: 1, upper waveguide plate; 2, lower waveguide plate; 3, upper laser welding area; 4, lower laser welding area. Specific embodiments
[0029] In order to make the above objects, features and advantages of the present utility model more obvious and understandable, the following detailed description of the specific embodiments of the present utility model is made with reference to the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present utility model. However, the present utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed below.
[0030] 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", "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 of the present utility model.
[0031] As Figure 1 shown, a waveguide antenna structure based on laser welding is provided. The waveguide antenna structure is composed of an upper waveguide plate 1 and a lower waveguide plate 2, and is divided into upper and lower layers, as Figure 1 shown. The upper waveguide plate 1 is a light-transmitting member, as Figure 2 and 3 shown, and the lower waveguide plate 2 is a light-absorbing member, as Figure 4 and 5 shown,
[0032] As Figure 2 and 3As shown, the metal coating on the surface of the shaded areas on both the front and back sides of the light-transmitting component needs to be removed. This area is the upper laser welding area 3, and the surface of the remaining parts is all metal coating. As Figure 4 and 5 shown, the metal coating on the surface of the black area on the front side of the light-absorbing component needs to be removed. This area is the lower laser welding area 4, and the surface of the remaining parts is all metal coating.
[0033] Laser welding fuses the upper waveguide plate 1 and the lower waveguide plate 2 together through high-temperature melting in the welding area, ensuring no gap between the two and full combination of the waveguide cavities. As Figure 6 shown, before laser welding, there is a certain gap between the upper waveguide plate 1 and the lower waveguide plate 2. The laser passes through the upper waveguide plate 1 (light-transmitting component), and the laser energy is absorbed by the lower waveguide plate 2 (light-absorbing component) and converted into heat energy. Figure 8 The shaded part is the laser welding molten surface, melting a certain thickness of its surface. During this process, energy is transferred to the upper waveguide plate 1 through heat conduction. Under the synergistic action of the internal expansion force and the external jig pressure in the upper and lower waveguide plates, they are fully fused, and finally Figure 7 the effect in
[0034] is achieved. Until the welding surface is completely melted, the upper and lower waveguide plates are completely flush, ensuring full fusion of the waveguide cavities.
[0034] Before laser welding, as Figure 6 shown, the distance between the important mating surfaces in the metallized area of the waveguide plate is 0.2 - 0.5 mm. As Figure 8 shown, the melting depth of laser welding is 0.2 - 0.5 mm. As Figure 7 shown, through the welding technology of laser welding, the installation planes are in contact and fit to achieve the gain effect required for the waveguide antenna.
[0035] As Figures 9 - 11 shown, it is a schematic diagram of the laser welding principle. The laser transfers energy to the light-absorbing component through the light-transmitting component. Due to the heat of the molten surface on the light-absorbing component, its local part melts. During the melting process, heat is transferred to the light-absorbing component, and finally the molten surface and the light-transmitting component are fully fused. As Figure 11 shown, the dotted surface in the figure is the welding plane, and the surface metal coating needs to be removed from all welding planes to ensure that the laser can pass through efficiently.
[0036] As described above, it is only a preferred embodiment of the present invention and does not impose any form of limitation on the present invention. Any person skilled in the art, without departing from the scope of the technical solution of the present invention, can make many possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above, or modify it into an equivalent embodiment with equivalent changes. Therefore, all equivalent changes made according to the shape, structure, and principle of the present invention without departing from the content of the technical solution of the present invention should be covered within the protection scope of the present invention.
Claims
1. A waveguide antenna structure based on laser welding, characterized in that It includes an upper waveguide plate (1) and a lower waveguide plate (2). The upper waveguide plate (1) is made of a light-transmitting member, and the lower waveguide plate (2) is made of a light-absorbing member. An upper laser welding area (3) is provided on the upper waveguide plate (1), and a lower laser welding area (4) is provided on the lower waveguide plate (2). The upper laser welding area (3) and the lower laser welding area (4) are arranged corresponding to each other up and down and are laser welded together.
2. The waveguide antenna structure based on laser welding according to claim 1, characterized in that, The surface layer of the upper waveguide plate (1) is provided with a metal coating, and the upper laser welding area (3) does not include the metal coating; the surface layer of the lower waveguide plate (2) is provided with a metal coating, and the lower laser welding area (4) does not include the metal coating.
3. A waveguide antenna structure based on laser welding as described in claim 1, characterized in that, The upper and lower sides of the upper waveguide plate (1) are both provided with the upper laser welding area (3), and the front side of the lower waveguide plate (2) is provided with the lower laser welding area (4).
4. A waveguide antenna structure based on laser welding as claimed in claim 1 or 3, characterized in that The upper laser welding area (3) is set as a concave area, and the lower laser welding area (4) is set as a convex area.
5. The waveguide antenna structure based on laser welding according to claim 2, characterized in that, Before the upper laser welding area (3) and the lower laser welding area (4) are welded, the distance between the metal coating areas of the upper waveguide plate (1) and the lower waveguide plate (2) is 0.2 mm - 0.5 mm.
6. The waveguide antenna structure based on laser welding according to claim 5, characterized in that, The melting depth of the laser welding of the upper laser welding area (3) and the lower laser welding area (4) is 0.2 mm - 0.5 mm. After welding, the metal coating areas of the upper waveguide plate (1) and the lower waveguide plate (2) are in contact with each other.