Steel mesh for enhancing shielding performance of shielding case

Abstract

The utility model discloses a steel mesh for enhancing the shielding performance of a shielding case, a plurality of open pores for assisting solder paste to be transmitted to a shielding case welding point pattern on a bonding pad are formed on the steel mesh, the open pores comprise outer-layer open pores and inner-layer open pores at the welding position of the shielding case, and continuously alternate concave-convex bending structures are arranged between the two layers of open pores. The concave-convex bent structure is arranged on the outer side of the outer layer, the inward concave portion of the outer side of the concave-convex bent structure is provided with an outward first connecting portion, the outer layer opening surrounds the top end of the first connecting portion, the outward convex portion of the inner side of the concave-convex bent structure is provided with an inward second connecting portion, and the inner layer opening surrounds the top end of the second connecting portion. The holes of the steel mesh are designed into the inner layer and the outer layer, so that a channel for communicating the inner layer and the outer layer of soldering tin is bent, the electromagnetic passing path length is increased, the relative gap between solder paste is reduced, the electromagnetic entering and exiting difficulty is increased, and the shielding performance of the shielding cover is improved; and meanwhile, the tin consumption of the shielding cover is increased, so that the welding is firmer, batch production can be realized and the cost is not increased.

Description

Technical Field

[0001] The utility model relates to a steel mesh for enhancing the shielding performance of a shielding cover. Background Art

[0002] In the field of electronic engineering, in order to prevent external electric, magnetic or electromagnetic fields from interfering with internal sensitive devices, or to reduce the impact of the electromagnetic field generated by the device itself on the external environment, we usually use a metal structure called a shield. This shield, usually in the form of a closed or nearly closed metal shell or metal mesh, is widely used in various electronic devices to ensure their electromagnetic compatibility and stability.

[0003] As an efficient electromagnetic shielding tool, the main function of the shielding cover is to isolate external electromagnetic waves from internal circuits to prevent them from interfering with each other. At the same time, it can also effectively prevent the electromagnetic waves generated by the internal circuit from leaking out, protecting the surrounding environment and equipment from electromagnetic pollution.

[0004] When designing PCBs that have extremely high requirements for electromagnetic compatibility (EMC), such as key components such as DC-DC power supplies or analog RF modules, we usually need to consider more sophisticated and professional shielding solutions. In order to improve shielding performance while controlling production costs, engineers often use steel mesh welding to install shielding covers.

[0005] Although this steel mesh welding process reduces the production difficulty and cost to a certain extent, there are some problems that cannot be ignored in practical applications. In particular, when tinning the openings of the steel mesh, the height of the tinning area and the gaps between the two pieces of solder paste provide possible paths for the entry and exit of electromagnetic waves. After the shielding cover is welded, these gaps allow electromagnetic energy inside or outside the shielding cover to easily penetrate, thereby weakening the shielding effect. Utility Model Content

[0006] In order to overcome the deficiency of the shielding cover of the prior art that has a tin-smeared and welded steel mesh structure and has insufficient shielding performance, the utility model provides a steel mesh that enhances the shielding performance of the shielding cover.

[0007] The technical solution of the utility model is as follows:

[0008] A steel mesh for enhancing the shielding performance of a shielding cover, a plurality of openings for assisting the transfer of solder paste to a shielding cover welding point pattern on a pad are formed on the steel mesh plate body, at the shielding cover welding position, the openings include outer layer openings and inner layer openings, a continuously alternating concave-convex bending structure is provided between the outer layer openings and the inner layer openings, and an outward first connecting portion is provided on the concave portion on the outer side of the concave-convex bending structure, the outer layer openings surround the top end of the first connecting portion, and an inward second connecting portion is provided on the convex portion on the inner side of the concave-convex bending structure, the inner layer openings surround the top end of the second connecting portion.

[0009] Furthermore, in one embodiment, at a straight position on the shielding cover, the outer layer opening and the inner layer opening are inverted concave holes or positive concave holes, and the convex portions at both ends of the positive concave holes respectively extend into the concave portions of two adjacent inverted concave holes, and the convex portions at both ends of the inverted concave holes respectively extend into the concave portions of two adjacent positive concave holes.

[0010] Furthermore, in one embodiment, the width from the outer edge of the outer layer opening to the inner edge of the inner layer opening is consistent with the welding width of the shielding cover, and the welding width is 60 mil-80 mil.

[0011] Furthermore, in one embodiment, the concave holes of the outer layer openings are consistent in size with the concave holes of the inner layer openings.

[0012] Furthermore, in one embodiment, the first connecting portion, the second connecting portion and the concave-convex bending structure have the same width.

[0013] Furthermore, in one embodiment, the width from the outer edge of the outer layer opening to the inner edge of the inner layer opening is 80 mil.

[0014] Among them, the width of the concave-convex bending structure, the width of the first connecting part and the width of the second connecting part are all 10 mils; the length of the concave hole is 110 mils, the width is 50 mils, the width of the convex part of the concave hole is 20 mils, the height of the concave between the two convex parts is 30 mils, and the length of the concave part is 70 mils.

[0015] Furthermore, in one embodiment, the outer layer openings and the inner layer openings are made by laser, electroforming or etching.

[0016] The utility model according to the above scheme has the beneficial effect of changing the structure of the steel mesh, designing the openings of the steel mesh into two layers of outer openings and inner openings, and alternating and complementing the outer openings and the inner openings, so that the shape of the channel connecting the inside and outside of the shielding cover solder is bent, which increases the length of the electromagnetic passage path and reduces the relative gap between the solder pastes, increases the difficulty of electromagnetic entry and exit, and improves the shielding performance of the shielding cover; at the same time, the amount of tin consumed by the shielding cover is increased to make the welding of the shielding cover more firm, which can meet the needs of mass production without increasing costs, and can also increase shielding performance. The present application reduces the gaps between the solder pastes, improves the overall sealing of the shielding cover, and meets the requirements of applications requiring high-precision electromagnetic shielding. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the solder paste distribution of a general steel mesh shield;

[0018] Figure 2 It is a structural schematic diagram of the utility model;

[0019] Figure 3 for Figure 2 A magnified view of part A;

[0020] Figure 4 It is a schematic diagram of partial solder paste distribution when the shielding cover of the utility model is welded.

[0021] In the figure, 100, solder paste welding block; 200, solder paste gap;

[0022] 1. Steel mesh plate body; 101. Concavo-convex bending structure; 102. First connecting part; 103. Second connecting part; 2. Inner layer opening; 3. Outer layer opening. DETAILED DESCRIPTION

[0023] The utility model is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on another element or there can be one or more centered elements therebetween. When an element is described as "connected" to another element, it can be directly connected to another element or there can be one or more centered elements therebetween. The terms "vertical", "horizontal", "left", "right", "inside", "outside" and similar expressions used in this specification are for illustrative purposes only. In the description of the utility model, the terms "first" and "second" are used only for descriptive purposes and cannot be understood as indicating relative importance or implicitly indicating the number of technical features indicated. Therefore, unless otherwise specified, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features; the meaning of "multiple" is two or more. The term "include" and any variation thereof means non-exclusive inclusion, and one or more other features, integers, steps, operations, units, components and / or combinations thereof may be present or added.

[0024] In addition, unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" 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 a direct connection, an indirect connection through an intermediate medium, or a connection between two components. All technical and scientific terms used in this specification have the same meaning as those generally understood by technicians in the technical field of the present utility model. The terms used in the specification of the present utility model are only for the purpose of describing specific embodiments and are not used to limit the present utility model. The term "and / or" used in this specification includes any and all combinations of one or more related listed items.

[0025] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0026] like Figure 2-Figure 3As shown, the present application provides a steel mesh embodiment for enhancing the shielding performance of the shielding cover, and a plurality of openings for assisting the solder paste to be transferred to the shielding cover welding point pattern on the pad are formed on the steel mesh plate body 1. At the shielding cover welding position, the openings include outer layer openings 3 and inner layer openings 2, and there are continuously alternating concave-convex bending structures 101 between the outer layer openings 3 and the inner layer openings 2, and the concave part on the outer side of the concave-convex bending structure 101 has an outward first connecting portion 102, and the outer layer opening 3 surrounds the top of the first connecting portion 102, and the convex part on the inner side of the concave-convex bending structure has an inward second connecting portion 103, and the inner layer opening 2 surrounds the top of the second connecting portion 103. The first connecting portion 102 and the second connecting portion 103 connect the concave-convex bending structure 101 with the steel mesh plate body 1. The structure of the steel mesh described in the present application is to design the openings of the steel mesh into two layers, the outer openings 3 and the inner openings 2, which are alternately complementary. During the welding process, the concave-convex bending structure 101 of the present embodiment makes the channel shape of the shielding cover soldering inside and outside bend, which helps the shielding cover to be almost completely tinned to form a sealed space, increases the length of the electromagnetic passage path and reduces the relative gap between the solder pastes, increases the difficulty of electromagnetic entry and exit, and improves the shielding performance of the shielding cover; at the same time, it also increases the amount of tin eaten by the shielding cover to make the welding of the shielding cover more firm, which can meet the needs of mass production without increasing costs, and can also increase the shielding performance. The present application can reduce the gaps between the solder pastes, improve the overall sealing of the shielding cover, and meet the requirements of applications requiring high-precision electromagnetic shielding.

[0027] In one embodiment, in the straight position of the shielding cover, the outer layer opening 3 and the inner layer opening 2 are inverted concave holes or positive concave holes, and the convex parts at both ends of the positive concave hole extend into the concave parts of the two adjacent inverted concave holes, and the convex parts at both ends of the inverted concave hole extend into the concave parts of the two adjacent positive concave holes. The concave hole of the outer layer opening 3 is consistent with the concave hole of the inner layer opening 2. The regular outer layer opening 3 and the inner layer opening 2 facilitate the drawing of the steel mesh pattern, improve the efficiency of steel mesh production, and facilitate the subsequent opening of the steel mesh.

[0028] At the bending position of the shielding cover, it is necessary to ensure that the concave-convex bending structure 101 has alternating concave and convex shapes, and to adjust the shapes of the outer layer opening 3 and the inner layer opening 2 accordingly. Figure 2 As shown, the opening can also be L-shaped, an irregular hole formed by connecting two concave holes, or an irregular hole with two bends at the inner concave position, as well as a concave hole with asymmetric convex parts on both sides. The shape of the opening at the bending position can be adaptively adjusted to ensure that the solder paste gap 200 formed by the steel mesh remains the same. The concave-convex bending structure 101 has an alternating concave and convex shape to ensure that the solder paste gap 200 is bent, so that electromagnetic radiation cannot directly enter the shielding cover.

[0029] In one embodiment, the width from the outer edge of the outer opening 3 to the inner edge of the inner opening 2 is consistent with the welding width of the shielding cover, and the welding width is 60 mil-80 mil.

[0030] In one embodiment, the widths of the first connecting portion 102, the second connecting portion 103 and the concave-convex bending structure 101 are consistent. After the printed circuit board is tinned, the solder paste gap 200 between each solder paste welding block 100 formed at the position of the outer opening 3 and the inner opening 2 is formed by the space occupied by the concave-convex bending structure 101, the first connecting portion 102 and the second connecting portion 103. When the widths of the first connecting portion 102, the second connecting portion 103 and the concave-convex bending structure 101 are consistent, the solder paste gap 200 also maintains the same width. When the gaps between the shielding cover solder are uneven, these gaps will form a path for electromagnetic leakage, allowing the external electromagnetic field to penetrate the shielding cover, or the internal electromagnetic field to radiate outward. Therefore, maintaining the sameness of the solder gap helps to reduce such leakage and improve the shielding effect. Consistent gaps also help to ensure the predictability and repeatability of shielding performance. Through standardized welding process and parameter control, it is easier to achieve gap consistency and reduce uncertainty and error rate in the production process. Therefore, maintaining the same solder gap also helps to improve production efficiency and quality. That is, the consistency of the width of the first connecting portion 102, the second connecting portion 103 and the concave-convex bending structure 101 can ensure the efficiency and consistency of electromagnetic shielding, improve the electromagnetic compatibility of the device shielding cover, and optimize the production process of the circuit board.

[0031] In one embodiment, the width from the outer edge of the outer opening 3 to the inner edge of the inner opening 2 is 80 mil, wherein the width of the concave-convex bending structure 101, the width of the first connecting portion 102, and the width of the second connecting portion 103 are all 10 mil; the length of the concave hole is 110 mil, the width is 50 mil, the width of the convex portion of the concave hole is 20 mil, the height of the concave between the two convex portions is 30 mil, and the length of the concave portion is 70 mil. The steel mesh of the above embodiment can be formed as follows Figure 4 The solder paste welding blocks of the shielding cover shown in the figure have an inner and outer layer solder paste welding block 100 with a width of 80 mils. The sizes of the solder paste welding blocks 100 formed by tinning the concave holes are respectively consistent with the sizes of the corresponding openings. The width of the solder paste gap 200 is consistent with the width dimensions occupied by the first connecting portion 102, the second connecting portion 103 and the concave-convex bending structure 101. In the present embodiment, the width of the solder paste gap 200 is 10 mils.

[0032] In one embodiment, the outer openings 3 and the inner openings 2 are made by laser, electroforming or etching.

[0033] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the claims attached to the utility model.

[0034] The above is an exemplary description of the utility model patent in conjunction with the accompanying drawings. It is obvious that the implementation of the utility model patent is not limited to the above-mentioned method. As long as various improvements are made by adopting the method concept and technical solution of the utility model patent, or the concept and technical solution of the utility model patent are directly applied to other occasions without improvement, they are all within the protection scope of the utility model.

Claims

1. A steel mesh for enhancing the shielding performance of a shielding cover, wherein a plurality of openings for assisting the solder paste to be transferred to the shielding cover welding point pattern on the pad are formed on the steel mesh plate, characterized in that: At the welding position of the shielding cover, the opening includes an outer opening and an inner opening, and a continuously alternating concave-convex bending structure is provided between the outer opening and the inner opening, and the concave part on the outer side of the concave-convex bending structure has a first outward connecting portion, and the outer opening surrounds the top end of the first connecting portion, and the convex part on the inner side of the concave-convex bending structure has a second inward connecting portion, and the inner opening surrounds the top end of the second connecting portion.

2. The steel mesh for enhancing the shielding performance of the shielding cover according to claim 1, characterized in that: In the straight position of the shielding cover, the outer opening and the inner opening are inverted concave holes or positive concave holes, and the convex parts at both ends of the positive concave hole extend into the concave parts of the two adjacent inverted concave holes, and the convex parts at both ends of the inverted concave hole extend into the concave parts of the two adjacent positive concave holes.

3. The steel mesh for enhancing the shielding performance of the shielding cover according to claim 2, characterized in that: The width from the outer edge of the outer layer opening to the inner edge of the inner layer opening is consistent with the welding width of the shielding cover, and the welding width is 60 mil-80 mil.

4. The steel mesh for enhancing the shielding performance of the shielding cover according to claim 3, characterized in that: The concave holes of the outer layer openings have the same size as the concave holes of the inner layer openings.

5. The steel mesh for enhancing the shielding performance of the shielding cover according to claim 4, characterized in that: The first connecting portion, the second connecting portion and the concave-convex bending structure have the same width.

6. The steel mesh for enhancing the shielding performance of the shielding cover according to claim 5, characterized in that: The width from the outer edge of the outer layer opening to the inner edge of the inner layer opening is 80 mil. Among them, the width of the concave-convex bending structure, the width of the first connecting part and the width of the second connecting part are all 10 mils; the length of the concave hole is 110 mils, the width is 50 mils, the width of the convex part of the concave hole is 20 mils, the height of the concave between the two convex parts is 30 mils, and the length of the concave part is 70 mils.

7. The steel mesh for enhancing the shielding performance of the shielding cover according to claim 1, characterized in that: The outer layer openings and the inner layer openings are made by laser, electroforming or etching.

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