CN101227814A - Spring sheet on circuit board and electromagnetic shielding assembly - Google Patents

Abstract

The present invention discloses a spring clip welded on a circuit board, the spring clip comprising: a spring clip body having two opposite side wings and two end edges adjacent to the two side wings; an elastic arm extending from one of the two end edges and extending at an angle to the spring clip body; and two reversed welding sections extending from the two side wings of the spring clip body and folding back to correspond to the spring clip body. The present invention avoids unnecessary solder creeping by elevating the reversed welding section, so that the elastic arm will not easily produce stress concentration phenomenon, and the elasticity of the spring clip can be ensured, which can effectively prevent the elastic arm from bending, deforming or breaking, and thus can be used for a long time. The present invention also discloses an electromagnetic shielding assembly having the above spring clip structure.

Description

Shrapnel and electromagnetic shielding assembly on the circuit board

technical field

The invention relates to a shrapnel welded on a circuit board; in addition, the invention also relates to an electromagnetic shielding assembly having the above-mentioned shrapnel structure.

Background technique

Generally, in the electronic device, there is usually a shrapnel made of bent metal material, which is soldered and fixed on the circuit board by surface mount technology (SMT). The elastic force of the shrapnel itself after being bent by the metal material can be used as a For example, the ground terminals of two circuit boards are connected to each other to avoid potential differences; another example is to set up a metal shell to shield some circuits and components from electromagnetic wave interference.

As shown in Figures 1 and 2, the common shrapnel 1 is a metal sheet formed by stamping, so that only a short side 102 of the central rectangular part is connected to the welding section 10 of the peripheral part, and is bent to form an elastic Arm 12, whereby the welded section 10 is a thin plate body with a rectangular perforation 100, and the elastic arm 12 is obliquely arranged at the short side 102 of the perforation 100 at an angle. When viewed from the side, the section of the elastic arm 12 is The arc-shaped sheet has a free end 120 formed on the side far away from the welding section 10 , and the elastic arm 12 forms a gentle arc near the free end 120 .

Although the shrapnel 1 can achieve the purpose of guiding, the free end 120 of the elastic arm 12 of the shrapnel 1 is a relatively gentle arc surface, and must be a thin plate because of its flexibility. 1 When soldering to the circuit board 5, the solder 6 may climb to the elastic arm 12 through the perforation 100 in the soldering section 10, so once the elastic fatigue is caused by careless operation or long-term use, it is easy to be soldered The short side 102 where the segment 10 is connected is broken or bent, so that the elastic arm 12 loses its originally intended function.

As shown in FIG. 3 , another common elastic piece 2 has a welding section 20 , an elastic arm 22 extending upward at an angle from one end of the welding section 20 , and an abutment section extending horizontally from one end of the elastic arm 22 24, so that the abutting section 24 and the welding section 20 both extend away from the elastic arm 22 toward the same side direction, so the welding section 20, the elastic arm 22 and the abutting section 24 jointly form an opening.

When connecting with a circuit board 5, first use vacuum suction equipment to adsorb on the abutting section 24 of the shrapnel 2, and move the shrapnel 2 to a specific position on the circuit board. During the transfer, it may also be accidentally collided, causing damage to the shrapnel 2. A lateral thrust causes the elastic arm 22 or the abutment section 24 to deform laterally. On the other hand, if excessive force is applied to press the abutment section 24 downward, the elastic arm 22 will , there may be an irreversible deformation at the junction of the elastic arm 22 and the welding section 20. As the deformation increases, the stress required for the deformation will be smaller. Under such a vicious cycle, the shrapnel 2 will eventually be completely damaged; the shrapnel 2 will be welded When being fixed on the circuit board 5, the solder 6 may also climb to the soldering section 20 and produce a stress concentration point 26 with a smaller radius of curvature between the soldering section 20 and the elastic arm 22, especially when the elastic arm is inadvertently operated. When the arm is tilted up in reverse, it is easy to break and bend at the stress concentration point 26.

Contents of the invention

In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is to provide an elastic arm that can effectively avoid bending deformation or breakage, and is not prone to stress concentration at the lower edge of the elastic arm due to tin climbing, and can be long-lasting. The shrapnel on the circuit board used.

The second technical problem to be solved by the present invention is to provide an electromagnetic shielding assembly having the above-mentioned elastic sheet structure.

In order to solve the above technical problems, the shrapnel on the circuit board proposed by the present invention is welded on the circuit board, including:

A shrapnel body having two opposite side wings and two end edges adjacent to the two side wings;

an elastic arm extending from one of the two end edges and forming an angle with the elastic body;

The two extend from the two side wings of the shrapnel body respectively, and fold back to the folded welding section corresponding to the shrapnel body.

As a preferred technical solution, the above-mentioned reflexed welding section of the present invention preferably includes a welding base and a welding tail extending from the welding base and corresponding to the elastic arm, and the two welding bases and the two welding tails are preferably connected to each other .

As another preferred technical solution, the elastic piece of the present invention is preferably integrally formed by a metal sheet.

In order to solve the second technical problem above, the electromagnetic shielding assembly proposed by the present invention is used to shield the circuit device on the circuit board, and includes a metal cover. Pads and a set of parts, each pad is provided with shrapnel on the aforementioned circuit board;

The metal cover includes a top wall, a plurality of side walls extending from the periphery of the top wall at an angle and respectively corresponding to the above-mentioned elastic pieces, and a connecting portion formed on the side wall;

When the metal cover is connected to the assembling part, the connecting part presses the elastic arm of the elastic piece close to its welding section.

Compared with the prior art, the shrapnel on the circuit board provided by the present invention avoids unnecessary solder creep through the height of the folded welding section, so that the elastic arm will not easily generate stress concentration, and the elasticity of the shrapnel can be ensured. It can effectively prevent the elastic arm from being bent, deformed or broken, and can be used for a long time; the electromagnetic shielding assembly provided by the present invention, when the plurality of shrapnels are welded to the pad, exerts downward pressure on the top wall of the metal cover, so that The side wall is in contact with the elastic arms of the plurality of elastic pieces, which are pressed down to narrow the opening of the elastic pieces, and the connecting part is locked with the assembly part on the circuit board to form a closed space, thereby achieving the purpose of shielding.

Description of drawings

Fig. 1 is the structural representation of common shrapnel;

Fig. 2 is the structural representation of common shrapnel;

Fig. 3 is a schematic structural view of a common shrapnel;

Fig. 4 is a three-dimensional schematic view of the first embodiment of the present invention;

5 is a schematic top view of the first embodiment of the present invention;

Fig. 6 is a schematic bottom view of the first embodiment of the present invention;

Figure 7 is a schematic rear view of the first embodiment of the present invention;

Fig. 8 is a schematic side view of the second embodiment of the present invention;

Fig. 9 is an explosion schematic diagram of the electromagnetic shielding assembly of the present invention;

Fig. 10 is a three-dimensional assembly schematic diagram of the electromagnetic shielding assembly of the present invention.

Among them: 1, 2, 3, 4 are shrapnel; 5 is circuit board; 6 is solder; 7 is electromagnetic shielding assembly; 8 is circuit device; 10, 20, 30 are welding section; 12, 22, 32 are elastic arms ;; 24 is the abutment section; 26 is the stress concentration point; 31 is the shrapnel body; 55 is the pad; 73 is the metal cover; 75 is the assembly part; 100 is the rectangular perforation; 310 is the flank; 312 is the edge; 300,400 are the welding base; 302 is the welding tail; 730 is the top wall; 733 is the side wall; 735 is the connecting portion.

Detailed ways

The foregoing and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description in conjunction with preferred embodiments and accompanying drawings.

As shown in Figures 4-7, the elastic sheet 3 on the circuit board provided by a preferred embodiment of the present invention is an integrally formed metal sheet, which includes an elastic sheet body 31, and the upper and lower sides of the elastic sheet body 31 are two opposite side wings 310 ( As shown in Figure 4), the two side wings adjacent to the left and right sides are two end edges 312. In this embodiment, the side wings 310 and the end edges 312 are perpendicular to each other to form a rectangle; Folded elastic arm 32; two opposite side wings 310 of the elastic body 31 are respectively folded downwards to form a welding section 30, and the welding section 30 can be divided into a welding base 300 corresponding to the elastic body 31 and a welding base 300 extending from the elastic body 31. Corresponding to the welding tail 302 of the elastic arm 32 , the two welding bases 300 are connected to each other, and the welding tail 302 is also the same.

When it is surface mount technology (SMT), solder the welding section 30 on the circuit board. The welding section 30 is formed by refolding the two opposite side wings 310 of the shrapnel body 31, and is integrally formed without seams, which can prevent The purpose of the elastic piece 3 being deformed or broken after long-term use, and the welding section 30 further includes the plurality of welding tails 302 , and the plurality of welding tails 302 are also helpful to achieve the purpose of welding.

Of course, as those skilled in the art can easily understand, as shown in FIG. Soldering on the circuit board by surface mount technology (SMT) can not only achieve a stable installation effect, but also save materials for the shrapnel manufacturing. The rest of the structure is the same as the first preferred embodiment and will not be described in detail.

In addition, as shown in Figures 9-10, when the open circuit device 8 is welded on the circuit board 5, it is easy to be interfered by other electronic devices and affect its own electrical characteristics, so it can be installed outside the circuit device 8. An electromagnetic shielding assembly 7 is formed, the electromagnetic shielding assembly 7 includes a metal cover 73, the metal cover 73 includes a top wall 730, a side wall 733 extending at an angle from the top wall 730, and a connecting side wall 733 connecting portion 735, one corresponding to the metal cover 73, and soldered to the predetermined welding position is a plurality of elastic pieces 3 of the pad 55, and a set corresponding to the connecting portion 735 of the metal cover 73 and located on the circuit board Set up Department 75.

In this embodiment, when the plurality of elastic pieces 3 are welded to the pad, pressure is applied downward to the top wall 730 of the metal cover 73, so that the side wall 733 is in contact with the elastic arms 32 of the plurality of elastic pieces 3, so that it moves downward. Compress and narrow the opening of the elastic piece, and lock the connecting portion 735 with the assembly portion 75 on the circuit board to form a closed space, thereby achieving the purpose of shielding.

Claims (5)

1. A shrapnel on a circuit board, which is welded on a circuit board, is characterized in that the shrapnel includes: A shrapnel body having two opposite side wings and two end edges adjacent to the two side wings; an elastic arm extending from one of the two end edges and forming an angle with the elastic body; The two extend from the two side wings of the shrapnel body respectively, and fold back to the folded welding section corresponding to the shrapnel body. 2. The elastic piece on the circuit board according to claim 1, wherein the elastic piece is integrally formed by a metal sheet. 3 . The elastic piece on the circuit board according to claim 1 , wherein the reflexed soldering sections respectively comprise a soldering base and soldering tails extending from the soldering base and corresponding to the elastic arms. 4 . 4 . The elastic piece on the circuit board according to claim 3 , wherein the two solder bases and the two solder tails are connected to each other respectively. 5. An electromagnetic shielding assembly, which is used to shield the circuit device on the circuit board, includes a metal cover, and is characterized in that a plurality of pads and a group of setting parts surrounding the circuit device are formed on the circuit board, each contact The shrapnel on the circuit board described in any one of claims 1-4 is arranged on the pad; The metal cover includes a top wall, a plurality of side walls extending from the periphery of the top wall at an angle and respectively corresponding to the above-mentioned elastic pieces, and a connecting portion formed on the side wall; When the metal cover is connected to the assembling part, the connecting part presses the elastic arm of the elastic piece close to its welding section.

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