KR101046765B1 - Solderable Elastic Electrical Contact Terminals - Google Patents

Abstract

Solderable elastic electrical contact terminals are disclosed. The electrical contact terminal, the insulating elastic rubber formed on the outer surface of the elastic rubber coating layer integrally; An electroconductive member surrounding the elastic rubber coating layer and adhering to the elastic rubber coating layer; And a metal foil adhered to the bottom surface of the insulating elastic rubber through the elastic rubber coating layer and electrically connected to the electrically conductive member.

Elastic, Foamed, Tubing, Electrical Contact, Surface Mount, Reflow Soldering, Metal Foil

Description

Solderable Elastic Electric Contact Terminal

The present invention relates to an electrical contact terminal, and in particular, one side of the electrical contact terminal is fixed to the printed circuit board (PCB) by soldering, and the other side of the electrical contact terminal is elastically contacted to the opposite object to the object and the printed circuit board The present invention relates to a solderable resilient electrical contact terminal for electrically and mechanically connecting wires.

The present invention also relates to a reflow solderable elastic electrical contact terminal by surface mount.

In general, solderable elastic electrical contact terminals should have good electrical conductivity, excellent elastic recovery, and be able to withstand soldering temperatures.

In addition, reflow solderable elastic electrical contact terminals are easily designed and manufactured for surface mounting by vacuum pickup.

To this end, conventionally, a metal sheet such as beryllium copper, which has good elasticity, is mainly used as a solderable electrical contact terminal.

However, the electrical contact terminal made of only a metal sheet as described above has a number of limitations in size in order to provide proper elasticity, a high mold cost, and a light weight, so that the yield is poor in reflow soldering.

Another conventional technique is Korean Patent No. 783588, filed and registered by the present applicant. According to this patent, the elastic rubber having low hardness is not precise in size and difficult to manufacture reliably flat on the bottom, so that the elastic electrical contact terminal has a disadvantage in that the quality is not constant during reflow soldering operation. Furthermore, there is a disadvantage in that the soldering strength is worse than that in which the metal foil is soldered.

Another conventional technique is Utility Model No. 390490, filed and registered by the applicant. According to this utility model, an electrically conductive elastic rubber has a disadvantage that it is expensive and its electrical resistance is larger than that of metal.

Therefore, the present invention is proposed to solve such a problem, and an object of the present invention is to provide a solderable elastic electrical contact terminal having good strength in elasticity, electrical conductivity and soldering and low defect rate in reflow soldering.

In addition, it is to provide an elastic electrical contact terminal that is easy to surface mount and reflow soldering by vacuum pickup.

In addition, it is to provide an elastic electrical contact terminal that can be easily distinguished up and down and good productivity.

The above object is, the insulating elastic rubber formed integrally with the elastic rubber coating layer on the outer surface; An electroconductive member surrounding the elastic rubber coating layer and adhering to the elastic rubber coating layer; And a metal foil bonded to the bottom surface of the insulating elastic rubber through the elastic rubber coating layer and electrically connected to the electrically conductive member.

Preferably, both ends of the bottom surface of the electroconductive member and the metal foil may be soldered by solder cream, but the present invention is not limited thereto and may be soldered only to the metal foil.

The insulating elastic rubber may be a tube shape having a hole therein or foam rubber. By using the tube-shaped insulating non-foamed rubber as the elastic rubber, there is an advantage that the elasticity can be adjusted by adjusting the diameter of the inner through-hole without the need to use a foam rubber having a large dimensional tolerance. In addition, there is an advantage that the hardness can be lowered when using rubber foamed with elastic rubber.

The metal foil is precisely dimensioned and reduces side to side distortion, providing reliable soldering strength.

Preferably, the metal foil can be electrically connected with the electroconductive member through the elastic rubber coating layer or by direct contact.

Moreover, the metal foil and the electroconductive member are more reliably electrically contacted by the solder cream after reflow soldering by the solder cream.

In addition, the elastic rubber coating layer is formed by curing the liquid silicone rubber.

Preferably, the elastic rubber coating layer may be electrically conductive or non-conductive. In the case of the electroconductive, the electrically conductive member and the metal foil are electrically connected more reliably, and in the case of the non-conductive, the elastic rubber, the metal foil, and the electroconductive member are more strongly bonded.

In addition, the electroconductive member may be any one of a flexible flexible metal laminate film (FCCL) or a heat resistant electroconductive fiber.

Preferably, the electrically conductive member is electrically conductive on its outer surface.

Preferably, a part of the upper surface of the elastic electrical contact terminal is flat, so that reel packaging by vacuum pickup is easy.

The above object, the bottom portion is formed in the longitudinal direction along the longitudinal direction, the outer surface of the elastic rubber coating layer formed integrally with the elastic rubber coating layer; An electrically conductive member covering the elastic rubber coating layer except for the recessed portion and adhering to the elastic rubber coating layer; And a metal foil adhered to the elastic rubber coating layer corresponding to the recessed portion and separated from the electrically conductive member, wherein the electrically conductive member and the metal foil existing on the bottom surface of the insulating elastic rubber are solder cream after reflow soldering. By means of a solderable resilient electrical contact terminal which is electrically connected to each other.

Preferably, the electrically conductive member and the base metal foil present on the underside of the insulating elastic rubber are reflow soldered by solder cream in the same level plane.

According to the above configuration, the bottom surface of the electrical contact terminal is made of metal foil, the dimensional stability is good, the soldering is strong, the yield during reflow soldering is good.

In addition, it is easy to distinguish the top and bottom by the metal foil.

In addition, the metal foil and the electroconductive member are electrically connected, and moreover, electrically connected by the solder cream.

In addition, due to the self-weight of the metal foil, there is little movement due to external influences provided during surface mounting, resulting in a high yield during reflow soldering.

In addition, the elastic rubber coating layer serves as an adhesive for bonding the elastic rubber, the electrically conductive member and the metal foil and at the same time as the elastic body of the elastic rubber.

In addition, since the metal rubber, the electrically conductive member and the elastic rubber are simultaneously bonded to the elastic rubber coating layer, the productivity is good.

In addition, when the electrical contact terminal is pressed, the metal foil and the electrically conductive member are electrically connected more reliably.

Since the flexible conductive metal laminate film or the conductive fiber is used as the conductive member, the price is low and the electrical conductivity is good.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention;

1 is a perspective view showing an electrical contact terminal 100 according to an embodiment of the present invention.

Referring to FIG. 1, an elastic rubber coating layer 20 is integrally formed on an outer surface of a tubular insulating elastic rubber 10, and the elastic rubber 10 and the electrically conductive member 30 are interposed therebetween. And the elastic rubber 10 and the metal foil 40 is bonded reliably.

Specifically, both ends of the electrically conductive member 30 are spaced apart from the bottom of the elastic rubber 10 and bonded to the elastic rubber coating layer 20, the metal foil 40 via the elastic rubber coating layer 20 in between. ) Is glued. At this time, the electrically conductive member 30 and the metal foil 40 are electrically connected by overlapping each other in direct contact with each other. That is, the elastic rubber coating layer 20 is not formed on at least one portion of the portion where the conductive member 30 and the metal foil 40 overlap, and is electrically connected. In particular, when an external force is applied from the upper and lower parts, it makes a more reliable electrical contact and has a low contact electrical resistance.

Here, the width of the metal foil 40 is equal to or slightly smaller than the width of the elastic rubber 10, but is not limited thereto, and may be larger for strong soldering strength.

The elastic rubber 10 positioned in the innermost part of the core may be a filled rubber or a non-foamed rubber in a tubular shape as in this embodiment. The cross section of the elastic rubber 10 may have various shapes, and preferably, a portion of the upper surface of the elastic rubber 10 is at least flat to facilitate vacuum pickup.

Preferably, the elastic rubber 10 may be any one of silicone rubber or synthetic rubber satisfying the soldering conditions.

According to the present invention, the elastic rubber coating layer 20 is formed by curing the liquid silicone rubber adhesive, and at the same time serves as the adhesive and the elastic body.

Preferably, the elastic rubber coating layer 20 may be either electrically conductive or non-conductive, and in the case of the electroconductive, the electrically conductive member 30 and the metal foil 40 are more reliably electrically connected to each other. In the case of conductive, the elastic rubber 10, the metal foil 40 and the conductive member 30 is more strongly bonded.

In addition, the electrically conductive member 30 may be either a flexible flexible metal laminate film (FCCL) or a heat resistant electrically conductive fiber, and an object facing the outer surface of the electrically conductive member 30, that is, the metal foil 40. The contacting surface must be electrically conductive.

In particular, when the electrically conductive member 30 is a flexible metal laminated film, the thickness of the metal layer laminated on the outside is between 0.002 and 0.01 mm in consideration of flexibility, and the polymer film is a polyimide (PI) film having good heat resistance, In consideration of the mechanical strength, the thickness is between 0.01 and 0.05 mm.

In addition, the metal foil 40 has less distortion in the left and right directions of the electrical contact terminal 100, the metal foil 40 is a precise dimension and the soldered portion is constant.

Preferably, the metal foil 40 is copper foil plated with any one of tin, silver, or gold having a thickness of 0.02 to 0.2 mm in consideration of soldering strength, workability, and the like.

The electrical contact terminal 100 manufactured as described above has the following advantages.

First, since the metal foil 40 adhered to the bottom surface of the electrical contact terminal 100 has a precise and reliable plane, the soldering strength is good and the yield of reflow soldering is good.

In addition, it is easy to distinguish the top and bottom of the electrical contact terminal 100 by the metal foil 40, the reel packaging by the vacuum pickup is easy, and the movement during the reflow soldering due to the weight of the metal foil 40 is less.

In addition, since the elastic rubber coating layer 20 serves as an adhesive and an elastic body at the same time, it maintains a reliable adhesive force and elasticity before and after soldering.

In addition, the outer surface of the electroconductive member 30, that is, the outer surface of the electrical contact terminal 100 is made of a metal layer has good electrical conductivity and the metal foil 40 and the electrically conductive member 30 are electrically connected.

In addition, the metal foil 40 and the electroconductive member 30 are electrically connected more reliably after soldering by solder cream, and more reliably electrically by external pressure.

In addition, a part of the upper surface of the elastic rubber 10 to form a plane, it is easy to vacuum pickup.

The manufacturing method of the electrical contact terminal which has such a structure is demonstrated.

A thickness of 0.02 mm to casting is achieved by casting a flexible, electrically conductive member 30 having a constant width with a metal layer formed on the back surface thereof, for example, a liquid silicone rubber that is cured by heat on the surface of a polymer film of a single-sided flexible metal laminate film. Applying 0.3 mm to form a silicone rubber coating layer, the elastic rubber 10 made in the form of a roll by the extrusion process is placed on the coating layer and both ends of the conductive member 30 while passing through a jig of a predetermined shape. The elastic rubber 10 is wrapped to be spaced apart from the bottom of the elastic rubber 10.

In this way, the liquid silicone rubber coating layer interposed between the elastic rubber 10 and the electroconductive member 30 is pushed out to the bottom spaced portion of the elastic rubber 10 which is not wrapped in the electroconductive member 30. Subsequently, the metal foil 40 having a predetermined width is continuously supplied to the portion of the liquid silicone rubber coating layer that is pushed out.

In the above, when the thickness of the liquid silicone rubber coating layer is too thin, the adhesive strength is bad, and when the thickness of the coating layer is too thick, the liquid silicone rubber is pushed to a large spaced apart portion, the metal foil 40 and the electrically conductive member 30 are electrically Because it may be insulated, it is coated with a suitable thickness.

Thereafter, the electrically conductive member 30 and the metal foil 40 wrapping the elastic rubber 10 are placed in a mold having dimensions similar to those of the elastic rubber 10, and the liquid silicone rubber coating layer interposed therebetween is opened to the heat. When cured, the liquid silicone rubber coating layer is cured and is converted into an elastic rubber coating layer 20. Preferably, the temperature of the mold is about 130 to 200 ° C. At this time, the elastic rubber coating layer 20 serves to bond the elastic rubber 10, the electrically conductive member 30, and the elastic rubber 10 and the metal foil 40. That is, the liquid silicone rubber coating layer has elasticity while acting as an adhesive for bonding the elastic rubber 10 and the electrically conductive member 30 and the elastic rubber 10 and the metal foil 40 after curing in a mold having a predetermined size. It is made of an elastic rubber coating layer (20).

At this time, when the elastic rubber coating layer 20 is electrically non-conductive, both ends of the electrically conductive member 30 and both ends of the metal foil 40 do not have the elastic rubber coating layer 20 formed on at least one portion of the overlapping portion. Electrically connected. On the other hand, as shown in Figure 1a, when the elastic rubber coating layer 20 is electrically conductive, the electrically conductive member 30 and the metal foil 40 is electrically connected to each other via the elastic rubber coating layer (20).

Here, in order for the elastic rubber coating layer 20 to have electrical conductivity, 60% or more of metal powder such as silver (Ag) is mixed with the electrically nonconductive liquid silicone rubber so as to have an electrical resistance of 1 ohm or less after curing. .

Since the liquid silicone rubber coating layer does not melt again by heat once cured, the original adhesive performance is maintained even when soldering the electrical contact terminal 100.

In addition, the liquid silicone rubber coating layer is integrally formed with the elastic rubber 10 after curing, and forms a part thereof to reliably adhere the elastic rubber 10, the electrically conductive member 30, and the elastic rubber 10 and the metal foil 40. .

Subsequently, the elastic rubber coating layer 20 is completely cured by inserting the mold into a mold having a predetermined shape and putting the same in an oven at about 100 to 160 ° C. for about 5 to 20 minutes.

On the other hand, since the electrical contact terminal 100 is made of an electrically conductive member 30, for example, using a heat-resistant polymer film (FCCL) having a metal layer formed on its back surface, a long-length product has a problem such as wrinkles, which is usually 1 m or less. After preparing to the length of the cut to 3 mm to 20 mm length which is the last required length.

In the electrical contact terminal 100 manufactured as described above, the outer surface is made of a metal layer by the electroconductive member 30, and the metal foil 40 and the electroconductive member 30 are electrically connected to each other. In addition, it is easy to distinguish the upper and lower portions of the electrical contact terminal 100 by the metal foil 40 to facilitate the reel taping operation, and in particular, the wind supplied when the surface is mounted by vacuum pickup due to the self-weight of the metal foil 40. There is an advantage that does not move easily by. In addition, the bottom surface of the electrical contact terminal 100 is made of metal foil 40, so that the soldering strength is good, the reflow soldering yield is good, and a part of the upper surface of the elastic rubber 10 is flat to facilitate vacuum pickup. .

In addition, the metal foil 40 and the electrically conductive member 30 are electrically connected more reliably after reflow soldering by solder cream.

Also, preferably, the metal foil 40 and the electrically conductive member 30 may be soldered by solder cream.

2 is a cross-sectional view showing an electrical contact terminal 120 according to another embodiment of the present invention.

Compared with the embodiment of FIG. 1, in this embodiment, the recessed portion 12 is formed along the longitudinal direction in the central portion of the bottom surface of the elastic rubber 10. In addition, both ends of the electrically conductive member 30 are located up to the depression 12, the depression 12 is filled by the elastic rubber coating layer 20, the metal foil 40 corresponding to the depression 12 The metal foil 40 is electrically separated from the electroconductive member 30 because it is bonded by the elastic rubber coating layer 20.

According to this embodiment, since both ends of the conductive member 30 and the metal foil 40 form the same level in the separated state, the electrically conductive member 30 and the metal foil 40 are rippled by solder cream. Low soldering is possible.

Therefore, the electroconductive member 30 and the metal foil 40 are in contact with the solder cream formed on the printed circuit board to be electrically connected reliably when mounted on the printed circuit board.

In addition, since the metal foil 40 is adhered to the elastic rubber coating layer 20 in correspondence with the depression 12, workability is easy.

2A is a cross-sectional view illustrating a state in which the electrical contact terminal 120 manufactured according to this embodiment is applied. That is, the metal foil 40 and the electrically conductive member 30 of the electrical contact terminal 120 are mounted on the conductive pattern 60 formed on the printed circuit board 70 by the solder cream 50, wherein the solder cream ( 50) are electrically connected to each other.

In the above description, the embodiment of the present invention has been described, but various changes or modifications can be made at the level of those skilled in the art. Such changes and modifications may be said to belong to the present invention without departing from the scope of the present invention, and therefore, the scope of the present invention should be judged by the claims described below.

1 is a perspective view showing an electrical contact terminal 100 according to an embodiment of the present invention.

1A illustrates a variation of one embodiment.

2 is a perspective view showing an electrical contact terminal 120 according to another embodiment of the present invention.

2A is a cross-sectional view illustrating a state in which an electrical contact terminal 120 manufactured according to another embodiment is applied.

Claims (11)

Insulating elastic rubber having an elastic rubber coating layer formed on the outer surface thereof; An electrically conductive member wrapped around the elastic rubber coating layer and adhered to the elastic rubber coating layer, and spaced at both ends thereof; And And a metal foil adhered to the elastic rubber coating layer between the spaced opposite ends of the electrically conductive member and electrically connected to the electrically conductive member at both edges. The method according to claim 1, The elastic rubber coating layer is a solderable elastic electrical contact terminal, characterized in that formed by curing the liquid silicone rubber applied to the insulating elastic rubber. delete The method according to claim 1, And the electrically conductive member, the insulating elastic rubber and the metal foil are attached to the elastic rubber coating layer by hardening of the elastic rubber coating layer. The method according to claim 1, The elastic rubber coating layer is solderable elastic electrical contact terminal, characterized in that it is electrically conductive or electrically non-conductive. The method according to claim 1, The electroconductive member is a solderable elastic electrical contact terminal, characterized in that any one of a flexible metal laminated film or heat-resistant electroconductive fiber. The method according to claim 1, And the at least one surface of the electrically conductive member facing the metal foil is electrically conductive. The method according to claim 1, The electroconductive member and the metal foil are solderable elastic electrical contact terminals, characterized in that soldered by solder cream and electrically connected to each other. The method according to claim 1, The elastic electrical contact terminal is solderable elastic electrical contact terminal, characterized in that the surface mounting by vacuum pick-up and reflow soldering by solder cream. A tubular insulating elastic rubber having a depression formed in the bottom surface along the longitudinal direction, and having an elastic rubber coating layer formed continuously on the outer surface thereof; An electrically conductive member covering the elastic rubber coating layer except for the recessed portion and adhering to the elastic rubber coating layer; And A metal foil adhered to the elastic rubber coating layer corresponding to the depression and separated from the electrically conductive member, The electrically conductive member and the metal foil adhered to the elastic rubber coating layer on the bottom surface of the insulating elastic rubber are electrically connected to each other by the solder cream after reflow soldering by the solder cream. . The method according to claim 10, And the electrically conductive member and the metal foil existing on the bottom surface of the insulating elastic rubber are reflow soldered by the solder cream in the same level plane.

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