KR101204517B1 - Electric conductive gasket and method for making the same - Google Patents

Abstract

The present invention relates to an electrical contact terminal and a manufacturing method thereof. The electrical contact terminal of the present invention includes an upper support, a lower support parallel to the upper support, a vertical support connecting the upper support and the lower support, and an inner molding part formed of a viscoelastic resin inside the metal support. In the electrical contact terminal, the vertical support is formed to include a buffer portion bent inwardly from the metal support.
In addition, the manufacturing method of the electrical contact terminal may be provided with a method of forming such that the metal support, the inner molding portion and the outer molding portion is formed integrally.

Description

Electrical contact gasket and its manufacturing method {Electric conductive gasket and method for making the same}

The present invention provides an electrical contact terminal capable of soldering by filling a metal support and a viscoelastic resin integrally by filling a viscoelastic resin into a metal support plated by an insert injection molding method, heat and pressure, and a method of manufacturing the same.

In general, the solderable electrical contact terminals should have good electrical conductivity, excellent cushioning properties and withstand soldering temperatures. Such electrical contact terminals include finger gaskets made of beryllium or copper, conductive silicon gaskets made by mixing and curing metal powders with non-conductive silicon, and knitting gaskets knitted with electrically conductive wires on non-conductive urethane or silicon. knitting gasket).

Conventionally, a metal material is mainly used as an electrical contact terminal capable of reflow soldering. For example, a beryllium copper sheet of 0.2 to 3 mm was punched into a predetermined shape through a press die, and then an electrical contact terminal having a cushion property was manufactured through a heat treatment process. However, the electrical contact terminals made of only these metal sheets should be bent to a certain shape in order to have cushioning properties, and because of these parts, the bending height is determined, which makes it difficult to apply at a portion below a certain height and consists of only a thin metal sheet. When the surface was mounted, there was a part where the terminal moved and the soldering defect was easy to occur.

In addition, such a conventional electrical contact terminal has a compression through-hole of the electrically conductive gasket material having a compression through hole and an electrically conductive support layer having a folding process (CLIMP) formed at the bottom of the electrically conductive gasket material to produce productivity when producing an EMI gasket assembly. This has the disadvantage of falling. In addition, a gasket material having a compression through hole formed by the impact of a soldered gasket after surface mounting, and other conventional technologies, have a disadvantage of being separated from the conductive electrically conductive support layer and thus failing to serve as an electrical contact terminal.

In addition, the conventional electrical contact terminal has a technology of forming an electrical contact terminal by attaching a metal plated heat-resistant polymer film, PI film using a foamed elastic rubber as a support. These electrical contact terminals have cushioning properties with excellent resilience, but the metal plating layer formed on the heat-resistant polymer film may be peeled off, resulting in a disadvantage of failing to serve as electrical contact terminals. The heat-resistant polymer film, which is a support of the electrical contact terminal, is ruptured by the impact, so that a phenomenon in which the printed circuit board and the electrical contact terminal are separated may occur.

In order to solve the above problems, an object of the present invention is to provide an electrical contact terminal in which the surface-mounted electrical contact terminal is separated from the printed board or the separation of the metal support and the viscoelastic resin of the electrical contact terminal itself does not occur. .

Another object of the present invention is a metal support layer is plated with a nickel / tin plated on a base layer of stainless steel (SUS), copper (COPPER), aluminum (AL) of 0.03 ~ 0.05 mm to form a plating layer, the plating layer by scratches, such as scratch Even if peeled off, to provide an electrical contact terminal that can be connected to the electrical properties of the metal support of stainless and copper.

Another object of the present invention is to insert a metal support on the surface of the metal sheet of stainless (SUS), copper (copper), aluminum (AL) in the mold by the insert molding method to form a metal support to the outside to the inside of the mold By injecting a batch and viscoelastic resin, the product is molded by heat and pressure to provide an electrical contact terminal having product dimensional stability.

It is another object of the present invention to distinguish the color of the viscoelastic resin to be filled from the color of the metal support, and the metal support is filled with the viscoelastic resin, so that the distinction between the top / bottom and the side without a separate identification mark by the product self-molding It is to provide an electrical contact terminal that can be easily soldered.

Another object of the present invention is to improve the lead rise phenomenon on both sides of the electrical contact terminal, and to provide an electrical contact terminal having a reliable soldering strength.

In order to achieve the above object, an electrical contact terminal according to an embodiment of the present invention includes a metal support and the metal support formed as an upper support, a lower support parallel to the upper support, and a vertical support connecting the upper support and the lower support. In the electrical contact terminal including an inner molding portion formed of a viscoelastic resin therein, the vertical support may be formed to include a buffer portion 23 bent inwardly in the metal support.

In addition, the electrical contact terminal may be formed further comprising an outer molding portion formed of a viscoelastic resin on the outside of the metal support.

In addition, the outer molding portion may be formed from the upper end of the shock absorbing portion 23 to the connecting portion to which the lower support is connected.

In addition, the buffer part 23 may be formed between the inner molding part and the outer molding part.

In addition, the outer molding part may be formed only in the buffer part 23 bent from the vertical support.

In addition, the buffer unit 23 may be formed in that the cross section is bent in a c-shape. In addition, the buffer unit 23 may be formed in that the cross section is bent in a <shape.

In addition, the viscoelastic resin is formed of a silicone rubber having a hardness (Shore A) of 30 to 50.

In addition, the metal support may be formed by bending the metal sheet. The metal sheet may be formed in a thickness of 0.04 to 0.05 mm.

In addition, the metal sheet may be formed including a metal layer and a plating layer formed on one surface of the metal layer, and the plating layer may be formed on an outer side of the metal support.

In addition, the method of manufacturing an electrical contact terminal according to an embodiment of the present invention includes a metal sheet manufacturing step of manufacturing a metal sheet so that one surface of the metal layer is plated, and a metal sheet cutting step of cutting the manufactured metal sheet to a contact terminal size; A metal sheet bending step of bending the cut metal sheet, a metal support manufacturing step of manufacturing a metal support using the bent metal sheet, and an upper support and a lower support of the manufactured metal support correspond to the inside of the mold. It may be formed to include a metal support arrangement step of inserting the support, a molding step of forming an electrical contact terminal by injecting a viscoelastic resin into the mold and a completion step of separating the molding from the mold.

In addition, the metal sheet bending step may be bent at least one or more times in the inner direction of the metal support on the first bending step of bending the metal sheet in the upper support to form a vertical support, and the vertical support formed in the first bending step. In the second bending step in which the buffer part 23 is formed, and the vertical support formed in the second bending step, the third bending of the lower end of the vertical support is bent such that the ends of the vertical support correspond to each other and are parallel to the upper support. It may be formed to include a step.

In addition, the molding step may be characterized in that it further comprises an outer molding step so that the viscoelastic resin is molded on the outside of the vertical support on which the buffer portion 23 is formed.

According to the present invention, a tin / nickel plating process is performed on one surface of a base material of stainless steel (SUS), copper, and aluminum (AL) on the metal mold, and a metal support is formed on the outside of the metal plate on the surface of the metal mold. It is possible to prevent the phenomenon in which the metal support and the viscoelastic resin are integrated and separated by heat and pressure after being placed in a mold suitable for the shape of the metal support and filling the viscoelastic resin.

In addition, the electrical contact terminal of the present invention can prevent the phenomenon that the electrical contact terminal is separated from the printed circuit board even after the impact after the surface mounting. In addition, since the electrical contact terminal is molded into a mold, product numerical defects occurring in the existing product cannot be found and thus the product has dimensional stability.

In the metal sheet of the present invention, a tin / nickel layer is plated on a base layer of stainless steel (SUS), copper (COPPER), and aluminum (AL) having a thickness of 0.03 to 0.05 mm to form a plating layer, and the plating layer is peeled off by an impact such as a scratch. In the case of losing, there is an effect of maintaining the electrical properties of the base layer, such as stainless and copper.

In addition, in the present invention, the color of the viscoelastic resin and the color of the metal support are distinguished, and since the viscoelastic resin is filled in the metal support, it is easy to distinguish the top / bottom and the side without the separate identification mark by the product itself molding.

In addition, the electrical contact terminal according to the present invention has an effect of improving the solder rise phenomenon and improve the soldering strength.

1 is a perspective view of a metal support 20 showing an embodiment in which the metal sheet is bent.
FIG. 2 is an enlarged cross-sectional view of region 2 of FIG. 1.
3 is a cross-sectional view of the II direction in FIG.
4 is a cross-sectional view of the electrical contact terminal 100 formed by inserting a viscoelastic resin into the metal support 20 of FIG.
5 is a cross-sectional view of an electrical contact terminal 200 showing another embodiment of the present invention.
6 is a cross-sectional view of an electrical contact terminal 300 showing another embodiment of the present invention.
7 is a cross-sectional view of an electrical contact terminal 400 showing another embodiment of the present invention.
8 is a flowchart illustrating a method of manufacturing an electrical contact terminal according to an embodiment of the present invention.

Hereinafter, the electrical contact terminal of the present invention and a manufacturing method thereof through the embodiments and the accompanying drawings will be described in more detail.

First, the electrical contact terminal 100 according to an embodiment of the present invention will be described.

1 is a perspective view of a metal support 20 showing an embodiment in which the metal sheet is bent. FIG. 2 is an enlarged cross-sectional view of region 2 of FIG. 1. 3 is a cross-sectional view of the II direction in FIG. 4 is a cross-sectional view of the electrical contact terminal 100 formed by inserting a viscoelastic resin into the metal support 20 of FIG.

1 to 4, the electrical contact terminal 100 according to the exemplary embodiment of the present invention is formed to include the metal support 20 and the molding part 30.

The electrical contact terminal 100 is spaced apart from the object facing the printed circuit board after being soldered to the printed circuit board (not shown). The electrical contact terminal 100 is bent so that the metal sheet has a constant volume to form a metal support 20, the viscoelastic resin is formed inside and outside the volume.

2, the metal sheet 10 may have a thickness of 0.04 to 0.05 mm. The metal sheet 10 may be formed of a plate-shaped metal plate 12 formed of stainless steel (SUS), copper, or aluminum (AL). One side of the metal plate 12 may be formed with a plating layer 14 coated with tin or nickel.

The metal support 20 is formed by bending the metal sheet 10 cut to the size of the electrical contact terminal 100. In this case, the metal support 20 may be formed with a plating layer 14 on the outside.

The metal support 20 is formed to include the upper support 21, the vertical support (22, 25), the lower support (24, 27). The metal support 20 may have a constant volume formed inside the upper support 21, the vertical support 22, 25 and the lower support 24, 27.

The upper support 21 may be formed flat in the horizontal direction to correspond to the object facing the printed circuit board.

In addition, the vertical support (22, 25) is formed by bending both sides of the upper support (21). Hereinafter, only the first vertical support 22 formed on one side will be described. The second vertical support 25 formed on the other side of the upper support 21 may be symmetrically formed in the first vertical support 22 and the metal support 20. In addition, a buffer part 26 is formed in the second vertical support 25. Therefore, the second vertical support 25 is the same or similar to the first vertical support 22, the same reference numerals, and will not be described herein.

 An upper portion of the first vertical support 22 may be formed in a round shape 22a. The round shape 22a may prevent the upper contact 22a of the first vertical support 22 from being caught while the electrical contact terminal 100 is soldered to a printed circuit board or the like and assembled with an opposite object.

The first vertical support 22 is a buffer 23 is formed. The buffer part 23 is bent inward from the metal support 20.

2A to 3, the buffer part 23 may have a cross section having a 'C' shape. The buffer part 23 is a first bent surface 23a which is bent inwardly of the metal support 20 at the lower end of the round shape 22a, and a second bent vertically at the first bent surface 23a. A third bending surface 23d extending from the bending surface 23b and the second bending surface 23b and bent outwardly from the metal support 20 is formed.

The lower support 24 extends from the first vertical support 22 and is bent inward from the metal support 20. In this case, the lower support 24 is formed in parallel with the upper support 21. In addition, an end of the lower support 24 corresponds to an end of the lower support 27 of the second vertical support 25. In addition, the lower supports 24 and 27 corresponding to the ends may be fixed by soldering to a printed circuit board.

The molding part 30 is formed to include an inner molding part 31 and an outer molding part 32 and 33. The molding part 30 may be molded into a shape of the electrical contact terminal 100 by inserting a viscoelastic resin into the volume of the metal support 20.

Since the metal support 20 is molded with a viscoelastic resin therein, the metal support 20 may be molded to integrate the metal support 20 and the inner molding part 31 without a separate adhesive treatment.

In addition, the outer molding parts 32 and 33 may be formed in each of the buffer parts 23 and molded. The buffer part 23 may be bent inward from the metal support 20 to form a groove. The groove may be molded by filling the outer molding part 32. In this case, the buffer part 23 may be positioned between the inner molding part 30 and the outer molding part 32 to increase cushioning property when the electrical contact terminal 100 is subjected to vertical impact. In addition, since the molding part 30 is integrally molded with the metal support 20, a separation phenomenon does not occur. Therefore, it is possible to provide a stable electrical contact terminal 100.

Next, an electrical contact terminal 200 according to another embodiment of the present invention will be described. 5 is a cross-sectional view of an electrical contact terminal 200 showing another embodiment of the present invention.

Since the electrical contact terminal 200 is the same as the configuration shown in Figs. 1 to 4, detailed descriptions using the same reference numerals will be omitted. Hereinafter, a description will be given of the through hole 40 formed in the first molding part 31.

The through hole 40 is formed to penetrate the first molding part 31. In addition, the first molding part 31 may be molded so that the through hole 40 is positioned between the upper support 21 and the buffer part 23. The through hole 40 may be formed in a rectangular or polygonal shape or a circular or elliptical shape. Herein, the present invention is not limited according to the shape of the through hole 40, and the through hole 40 may be variously modified into a circular or polygonal shape. The through hole 40 may increase the cushioning property when the electrical contact terminal 200 is subjected to up and down impact, thereby improving the pressing property.

Next, an electrical contact terminal 300 according to another embodiment of the present invention will be described. 6 is a cross-sectional view of an electrical contact terminal 300 showing another embodiment of the present invention.

Since the electrical contact terminal 300 is the same as the configuration shown in Figs. 1 to 4, detailed description is omitted using the same reference numerals. In addition, a through hole 40 may be formed in the electrical contact terminal 300 to penetrate the inner molding part 31. The through-hole 40 is the same as the configuration shown in Figure 5, so a detailed description thereof will be omitted. Hereinafter, the shape of the buffer part 23 will be described.

The buffer unit 23 may have a cross section having a '⊂' shape. The buffer part 23 has a first bent surface 23d bent inward from the metal support 20 in the round shape 22a and a second bent shape that is bent in a round shape at the first bent surface 23d. A third bent surface 23f extending from the surface 23e and the second bent surface 23e and bent in a round shape outward from the metal support 20 may be formed. The second bent surface 23e has a hemispherical shape, and the cushioning property is improved when the electrical contact terminal 300 is subjected to an up-down impact.

In addition, a through hole 40 may be formed in the electrical contact terminal 300 to penetrate the inner molding part 31. The through-hole 40 is the same as the configuration shown in Figure 5, so a detailed description thereof will be omitted.

Next, an electrical contact terminal 400 according to another embodiment of the present invention will be described. 7 is a cross-sectional view of an electrical contact terminal 400 showing another embodiment of the present invention.

Since the electrical contact terminal 400 is the same as the configuration shown in Figs. 1 to 4, detailed descriptions using the same reference numerals will be omitted. In addition, a through hole 40 may be formed in the electrical contact terminal 400 to penetrate the inner molding part 31. The through-hole 40 is the same as the configuration shown in Figure 5, so a detailed description thereof will be omitted. Hereinafter, the shape of the buffer part 23 will be described.

The buffer unit 23 may have a cross section having a '<' shape. The shock absorbing portion 23 is a first bent surface (23g) bent to be inclined inwardly from the metal support 20 in the round shape (22a), the metal support 20 in the first bent surface (23g) It may be formed including a second bent surface (23h) is bent to slope in the outward direction. The first bent surface 23g and the second bent surface 23h may be bent at an angle of 10 to 80 degrees. Preferably bent at an angle of 30 to 50 degrees to improve the cushioning property when the electrical contact terminal 300 is subjected to vertical impact.

The following describes a method of manufacturing the electrical contact terminal 100 according to an embodiment of the present invention. 8 is a flowchart illustrating a method of manufacturing an electrical contact terminal according to an embodiment of the present invention.

The manufacturing method of the electrical contact terminal 100 according to the embodiment of the present invention is a metal sheet manufacturing step (S100), metal sheet cutting step (S200), metal sheet bending step (S300), metal support fabrication step (S400) It is formed, including the metal support arrangement step (S500), molding step (S600) and the completion step (S700).

The metal sheet manufacturing step (S100) forms a plating layer 14 by plating one side of the metal plate 12. The metal plate 12 may be formed of a metal material according to elasticity and electrical resistance, and preferably, may be formed of a metal material of stainless steel (SUS), copper, or aluminum (AL).

The plating layer 14 may be formed of a plurality of metals. The plating layer 14 is formed by nickel plating, and is formed by plating the upper portion of the nickel plating with tin. The metal plate 12 includes a step of activating the surface of the metal plate 12 to enable uniform plating through one side by immersion degreasing and washing with water. The surface activation step includes removing the film with hydrogen chloride on the surface of the metal plate 12 and then repeating the deposition and washing process at least once. The metal plate 12 forms a nickel plating layer with a nickel chloride solution of 60 to 80 g / l after the coating is removed. The nickel plating layer serves as a substrate so that the tin plating described below can be formed. The nickel plating layer may be omitted, but since the electrical contact terminal 100 to be described below may be formed on a printed circuit board, etc., may be formed by an EMI (Electro Magnetic Interference) function. This can be formed.

The nickel plating layer oxidizes the upper portion and then activates the surface by washing with water to form a tin plating layer. The tin plating layer is plated with 15 to 30 g / l of sulfate solution and 120 to 200 g / l of sulfuric acid solution at a temperature of 10 to 20 ℃. After the tin plating layer is formed, the surface of the tin plating solution and a solution of sodium triphosphate solution and sodium cyanide are coated at a temperature of 55 ± 5 ° C. for about 60 seconds, followed by washing with water. The tin plating layer has improved corrosion protection and solderability. The plating layer of nickel and tin is preferably formed in 0.002 to 0.01mm in consideration of the flexibility, solderability, soldering strength of the metal sheet.

Since the metal sheet produced in the metal sheet preparation step (S100) is a support of the molding part 30 to be described below, the thickness is preferably 0.04 to 0.05 mm.

In the cutting of the metal sheet (S200), the manufactured metal sheet is cut according to the size of the electrical contact terminal 100. For example, the sheet is cut to 15.4 mm in width and 6 mm in length. The numerical value of the metal sheet of the present invention is not limited.

The metal sheet bending step (S300) is bending the metal sheet cut in the cutting step (S200) to have a constant volume.

In addition, the step of bending the metal sheet (S300) is a first bending step in which at least two vertical support (22, 25) is formed by vertically bending the metal sheet relative to the upper support 21, and the first bending step In each of the vertical support (22, 25) formed in the second bending step of bending at least one or more times in the inward direction of the cross section of the metal support 20 to form the buffer portion (23, 26), and in the second bending step Each of the formed vertical supports 22 and 25 includes a third bending step in which the lower ends of the vertical supports are bent so that the ends of the vertical supports correspond to each other. A constant volume is formed inside the upper support 21, the two vertical supports 22 and 25, and the lower support 24 and 27.

In the metal support manufacturing step (S400), the metal sheet 10 is bent to complete the metal support 20. The manufactured metal support 20 may be formed to have a width of 3.8 to 4 mm and a length of 3.8 to 4 mm based on the cross-sectional area, and the side length of the metal support 20 may be 6 mm. However, the numerical value is only one example for explaining the volume of the metal support 20 of the present invention, the present invention is not limited to the numerical value. In addition, the metal support fabrication step (S400) may change the areas of the lower supports 24 and 27 so as to correspond to areas where the metal support 20 is soldered to a printed circuit board or the like.

The metal support arrangement step (S500) inserts the metal support 20 so that the upper support 21 and the lower support (24, 27) of the produced metal support 20 and the inside of the mold.

In the molding step (S600), a viscoelastic resin is injected into the mold to form an electrical contact terminal 100. The viscoelastic resin is inserted inside the metal support 20. That is, the upper support 21 and the lower support (24, 27) is formed to surround the inner molding portion (31). In addition, the viscoelastic resin is formed to surround the buffers 23 and 26 formed on the side surfaces of the metal support 20. That is, the shock absorbing parts 23 and 26 are formed outside the outer molding parts 32 and 33 so that the shock absorbing parts 23 and 26 are not visible on the outer side of the electrical contact terminal 100. The buffer parts 23 and 26 are formed between the inner molding part 31 and the outer molding parts 32 and 33 to serve as a support when the electrical contact terminal 100 is subjected to vertical impact. In addition, the outer molding portion 32, 33 is formed on the outer side of the electrical contact terminal 100, the upper / lower surface and the side can be easily distinguished.

Viscoelastic resin in the molding step (S600) is characterized in that the hardness (Shore A) is 25 to 80. Preferably it may be formed of a silicone rubber having a hardness of 30 to 50. In addition, the inner molding part 31 and the outer molding parts 32 and 33 may be integrally formed with the metal support 20 to be integrally formed without a separate adhesive treatment.

The completion step (S700) is to separate the injection molding formed in the molding step (S600) from the mold to complete the electrical contact terminal 100. Preferably, the electrical contact terminal 100 having a height of 3.9 mm, a width of 3.9 mm, and a length of 6 mm is formed. The electrical contact terminal 100 is automatically picked up and reel-packed in a mold and reflow soldered by surface mounting.

In the above description, the embodiment of the present invention has been described. Such changes and modifications may belong to the present invention without departing from the scope of the present invention. In addition, the scope of the present invention will be determined by the claims described below.

10: metal sheet 12: metal layer
14: plating layer
20: metal support 21: upper support
30: molding part 31: inner molding part
32, 33: outer molding portion 40: through hole
100, 200, 300, 400: Electrical contact terminal

Claims (13)

Upper support; A lower support parallel to the upper support; And a metal support formed as a vertical support connecting the upper support and the lower support.
In the electrical contact terminal comprising an inner molding portion formed of a viscoelastic resin inside the metal support,
The vertical support includes a buffer portion bent inwardly from the metal support,
The electrical contact terminal comprises an outer molding portion formed of a viscoelastic resin on the outside of the metal support. delete The method of claim 1,
The shock absorbing portion is formed between the inner molding portion and the outer molding portion, the electrical contact terminal. The method of claim 3, wherein
The outer molding portion is an electrical contact terminal, characterized in that formed only in the buffer portion bent from the vertical support. The method of claim 1,
The shock absorbing portion is an electrical contact terminal, characterized in that the cross-section is bent to the c shape. The method of claim 1,
The shock absorbing portion is an electrical contact terminal, characterized in that the cross section is bent in <shape. The method of claim 1,
The viscoelastic resin is an electrical contact terminal, characterized in that the silicone rubber having a hardness (Shore A) of 30 to 50. The method of claim 1,
The metal support is an electrical contact terminal, characterized in that the metal sheet is formed by bending. The method of claim 8,
The metal sheet is an electrical contact terminal, characterized in that the thickness of 0.04 to 0.05 mm. The method of claim 8,
The metal sheet is formed including a metal layer, a plating layer formed on one surface of the metal layer,
The plating layer is an electrical contact terminal, characterized in that located on the outside of the metal support. One side of the metal layer is a metal sheet manufacturing step of manufacturing a metal sheet to be plated;
A metal sheet cutting step of cutting the manufactured metal sheet into a contact terminal size;
Metal sheet bending step of bending the cut metal sheet;
A metal support manufacturing step of manufacturing a metal support using the bent metal sheet;
A metal support arrangement step of inserting the metal support so that the upper support and the lower support of the manufactured metal support correspond to the inside of the mold;
Molding step of molding an electrical contact terminal by injecting a viscoelastic resin into the mold; And
Comprising the step of separating the molding from the mold; Method of manufacturing an electrical contact terminal comprising a. The method of claim 11,
The metal sheet bending step may include a first bending step of bending a metal sheet at an upper support to form a vertical support;
A second bending step in which the vertical support formed in the first bending step is bent at least one or more times into the metal support to form a buffer part;
Each vertical support formed in the second bending step includes a third bending step in which the lower ends of the vertical supports are bent such that the ends of each vertical support correspond to each other and are parallel to the upper support. . 13. The method of claim 12,
The molding step further comprises an outer molding step of molding the viscoelastic resin on the outside of the vertical support is formed buffer.

Images