Elastic electrical contact terminal

Abstract

The invention discloses an elastic electrical contact terminal with increased operating distance, small pressing force and excellent elastic restoring force. The electrical contact terminal includes: a tube formed of non-foamed elastic rubber; a polymer film adhered to the outside of the tube by interposing an adhesive and having a metal layer formed on an external exposed surface; and a foam core filling at least a part of the storage space of the tube and pasted to a side wall of the storage space, the foam core being made of elastic rubber with an open cell structure.

Description

technical field [0001] The invention relates to an electrical contact terminal, in particular to an electrical contact terminal with relatively small pressing force, relatively long operating distance, excellent elastic recovery force, heat resistance, and relatively stable reflow soldering performed by vacuum pick-up. Background technique [0002] In general, the elastic electrical contact terminal is preferably an elastic electrical contact terminal that is good in electrical conductivity and elasticity, has a large operating distance, is excellent in elastic recovery force, and is easy to reflow soldering by vacuum pick-up, so that it can be applied to mass production. [0003] The electrical contact terminal disclosed in Korean Granted Patent No. 1001354 filed by the present applicant has elasticity by means of a tube-shaped insulating elastic core having a through-hole formed inside, thereby having elastic restoring force. Also, it has the advantages of enabling vacuum ...

AI Technical Summary

Problems solved by technology

[0005] However, the above-mentioned patent has the following problems: Since the core is made of rubber material and is a non-foaming material, if it is left at high temperature for a long time, the performance will be reduced due to the deterioration of the rubber, and if the tube is pressed at high temperature If the pressing force is released after being placed in the state for a long time, the elastic recovery rate, which is the performance of the core returning to the original height, will decrease

[0006] In other words, there is a disadvantage that the pressing force and recovery rate of the electrical contact terminal are mainly determined by the wall thickness of the non-foamed rubber constituting both side walls of the core, but if the wall thickness is thinned in order to reduce the pressing force , the elastic recovery rate becomes worse after being placed at a high temperature. If the wall thickness is thickened, the elastic recovery rate becomes better, but the pressing force becomes larger and the operating distance that can be pressed along the height direction becomes smaller

[0007] For example, there is a disadvantage that it is difficult to return to more than 90% of the original height when the core with a through hole of a normal size is pressed to about 30% of the original core height and left in an oven at 125°C for about 1,000 hours and the pressing force is released.

[0011] However, such a sponge has disadvantages that it is difficult to have various cross-sectional shapes in precise dimensions and to manufacture continuously and economically in a roll state.

[0012] In other words, since the rubber material foams and hardens in the open free space to become the final shape of the sponge, there is a disadvantage that it is difficult to precisely and continuously manufacture the sponge with the cross-section of the desired shape and the manufacturing equipment is expensive

[0013] In particular, there is a difficulty in providing a shape of a sponge having an open cell structure with many pores formed so that the pressing force is small and the recovery rate is excellent so that there is less shaking or warping due to molten solder when soldering Shortcomings

[0014] In addition, there is a disadvantage that if the conductive film is bonded while covering the sponge with a liquid adhesive, the liquid adhesive will permeate into the pores constituting the open cells, and ultimately it is necessary to use a large amount of adhesive. Adhesive, and some of the pores are blocked due to the adhesive that penetrates into the pores, and finally the hardness of the sponge becomes high, which requires more material costs, and it is difficult to provide reliable quality

[0015] Also, there is a disadvantage that when the electrical contact terminal made of sponge is continuously manufactured in a reel state, since the sponge is easily stretched, it is difficult to manufacture the electrical contact terminal.

[0016] In addition, there are disadvantages as follows: relative to the volume, the weight of the sponge is relatively light, so the phenomenon of shaking or warping during reflow soldering is serious, and it is difficult to provide stable reflow soldering.

[0017] In particular, there is a disadvantage that it is difficult to provide stable reflow soldering when the height is high relative to the width and length

[0019] Such pads have the following disadvantages: although such pads are easy to use on objects such as instruments and the like, it is difficult to provide sponges of various shapes, and because the heat-resistant temperature of the hot-melt adhesive is low and can be used at high temperatures It is difficult to use in high-temperature applications such as vehicles because it melts

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