KR101867338B1 - Elastic electric connection terminals - Google Patents

Abstract

The elastic electrical contact terminal comprises: an insulated elastic core having two through holes formed therein; An insulating non-foamed rubber coating layer wrapped around the insulating elastic core; And a metal layer adhered to the insulating non-foamed rubber coating layer so as to surround the insulated non-foamed rubber coating layer, wherein both ends of the metal layer are separated from each other by a predetermined distance to form a groove, And both ends thereof are cut vertically downward. In this embodiment of the present invention, two through holes are formed on both sides of the foamed rubber layer, and it is stable when the electrical contact terminals are soldered between the printed circuit boards by forming the center space without emptying.

Description

[0001] Elastic electric connection terminals [0002]

The present invention relates to an elastic electrical contact terminal, and more particularly, to an elastic electrical contact terminal for preventing leakage of an insulation non-foamed rubber coating layer during soldering from being disturbed by soldering and uniformly forming a solder cream on an electrical contact terminal during soldering will be.

Generally, an elastic electrical contact terminal capable of reflow soldering has good electrical conductivity, good resilience, and can withstand the soldering temperature.

As regards the elastic contact terminals related thereto, an insulating foam rubber or an insulating non-sparking rubber; An insulating non-foamed rubber coating layer which is wrapped around the insulating foam rubber or non-foam rubber; And a heat-resistant polymer film having one surface bonded to the insulating non-foamed rubber coating layer so as to surround the insulating non-foamed rubber coating layer and a metal layer integrally formed on the other surface.

However, according to such a structure, when the heat-resistant polymer film is adhered to a liquid insulated non-foamed rubber coating layer, a part of the insulated non-foamed rubber coating layer in the liquid phase protrudes out of the heat- The middle part of the terminal bottom becomes bulging, and the lower surface is not horizontal or is not soldered by the insulating non-foaming rubber coating layer which is protruded to the outside.

As a result, during reflow soldering, the molten solder cream is shifted to one side, resulting in lifting of the electrical contact terminals after soldering, or partial soldering, which leads to weak soldering strength.

This problem is exacerbated as the size of the electrical contact terminal is increased and the amount of protrusion increases as the amount of the non-foamed rubber coating layer increases.

In addition, when both ends of the heat-resistant polymer film are overlapped, the amount of the insulating non-foamed rubber coating layer protruding from the overlapped portions at both ends is further increased, which adversely affects normal soldering.

In order to solve such a problem, conventionally, a heat-resistant polymer film is applied to an insulation non-foam rubber coating layer (not shown) so that both ends of the heat- And the leakage of the insulated non-foamed rubber coating layer which protrudes from both ends of the heat-resistant polymer film when the heat-resistant polymer film is adhered to the insulated non-foamed rubber coating layer, In a state in which a user is allowed to use the apparatus.

However, this conventional technique is not stable when soldering the electrical contact terminals between the printed circuit boards due to the large through-holes formed in the foamed rubber layer.

The leakage of the insulation non-foamed rubber coating layer is accommodated in the spacing space formed by both ends of the spaced apart heat-resisting polymer film, but the upper portion of the spacing space is formed of an isosceles triangle structure.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a foam rubber layer having two through holes on both sides thereof, Thereby providing an electrical contact terminal.

It is another object of the present invention to provide a non-foamed rubber coating layer having a rectangular shape so that the leakage of the insulation non-foamed rubber coating layer is sufficiently large in a groove formed by both ends of the separated metal layer. And to provide an elastic electrical contact terminal that forms a groove.

It is another object of the present invention to provide an elastic electrical contact terminal for collecting leakage of the insulation non-foamed rubber coating layer into a groove formed by both ends of a metal layer spaced from the upper portion, .

Another object of the present invention is to provide a resilient electrical contact terminal for preventing leakage of leaking water to the outside by forming a groove in an upper portion of a rectangular shape to accommodate a sufficient amount .

According to an aspect of the present invention, there is provided an elastic electrical contact terminal,

An insulated elastic core having two through holes formed therein;

An insulating non-foamed rubber coating layer wrapped around the insulating elastic core;

And a metal layer formed to surround the insulated non-foamed rubber coating layer,

The metal layer is adhered to the insulation non-foamed rubber coating layer while both ends thereof are spaced apart from each other by a predetermined distance,

And the separated both ends are vertically cut down.

And the groove has a rectangular cross section.

Characterized in that when the metal layer is adhered to the insulated non-foamed rubber coating layer, the leakage of the insulation non-foamed rubber coating layer protruding from both ends of the metal layer is accommodated in the groove formed by both ends of the separated metal layer .

Further, both side edges of the upper surface of the insulating elastic core may be rounded.

Preferably, the through holes may be formed in the central portion of the insulative elastic core such that the two are symmetrical to each other.

And a soft corrugation is formed in the lower center of the insulative elastic core.

According to another aspect of the present invention, there is provided an elastic contact terminal comprising:

An insulated elastic core having two through holes formed therein;

An insulating non-foamed rubber coating layer wrapped around the insulating elastic core;

And a metal layer adhered to the insulated non-foamed rubber coating layer so as to surround the insulated non-foamed rubber coating layer,

Wherein the metal layer is adhered to the insulating non-foamed rubber coating layer while both ends of the metal layer in contact with the upper portion of the insulating elastic core are spaced apart from each other by a predetermined distance,

And the separated both ends are vertically cut down.

According to the embodiment of the present invention, it is possible to provide a stable elastic electrical contact terminal when two through holes are formed on both sides of the non-foaming rubber layer and the middle space is formed without emptying to solder the electrical contact terminals between the printed circuit boards.

Further, in the embodiment of the present invention, an elastic electrical contact terminal is provided in which a leaked portion of the insulating non-foamed rubber coating layer forms a groove with a rectangular structure so as to receive a sufficient amount in a groove formed by both ends of the spaced apart metal layer .

Further, in the embodiment of the present invention, it is possible to provide an elastic electrical contact terminal in which the leakage of the insulating non-foamed rubber coating layer is collected in the groove formed by both ends of the metal layer spaced from the upper portion.

Further, in the embodiment of the present invention, it is possible to provide an elastic electrical contact terminal which forms a groove on the upper part with a rectangular structure so as to accommodate a sufficiently large amount and prevents leakage of the leakage to the outside.

1 is a perspective view illustrating an elastic electrical contact terminal according to a first embodiment of the present invention.
2 is a cross-sectional view taken along the line A-A 'shown in Fig.
FIG. 3 is a cross-sectional view showing the use state of the electrical contact terminal according to the first embodiment of the present invention.
4 is a cross-sectional view of an elastic electrical contact terminal according to a second embodiment of the present invention.
5 is a perspective view showing an elastic electrical contact terminal according to a third embodiment of the present invention.
6 is a cross-sectional view taken along the line B-B 'shown in Fig.
7 is a cross-sectional view illustrating a state of use of the electrical contact terminal according to the third embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

1 is a perspective view showing an elastic electrical contact terminal according to a first embodiment of the present invention,

2 is a cross-sectional view taken along the line A-A 'shown in Fig. 2,

FIG. 3 is a cross-sectional view showing the use state of the electrical contact terminal according to the first embodiment of the present invention.

1 to 3, the elastic electrical contact terminal 100 capable of reflow soldering according to the first embodiment of the present invention electrically connects the printed circuit boards 1 and 1 ' For example,

An extruded insulative elastic core 10, an insulated non-foamed rubber coating layer 20, and a metal layer 30 are sequentially laminated.

The insulative elastic core 10 may be formed in a tubular shape having two through holes 15 and 16 therein and may have a circular cross section, but is not limited thereto and may be provided by an extrusion process to have various shapes.

The material of the insulating elastic core 10 is preferably an insulating silicone rubber or a heat resistant elastic rubber in order to satisfy reflow soldering and elastic conditions.

The hardness of the material of the insulative elastic core 10 is preferably Shore A 40 to 70 for proper mechanical strength and elasticity and the pressing force of the upper surface of the insulative elastic core 10 is the same as that of the through holes 15 and 16 Can be reduced by size and shape.

2, the lower surface of the insulative elastic core 10 may be formed in a shape which is widened downward from both ends in the width direction.

Preferably, the grounding pattern 2 and the solder cream 3 are separated at the center by an insulation gap and the spacing distance is about 0.3 to 2 mm.

Further, both side edges of the upper surface of the insulative elastic core 10 may be rounded. According to this structure, it is easy to handle, and it is possible to prevent the engagement of the completed electrical contact terminal 100 on both sides in the process of being assembled with the opposing object after being soldered to the printed circuit board or the like.

The through holes 15 and 16 formed in the insulative elastic core 10 are preferably symmetrically formed on both sides from the center so that the elasticity of the insulative elastic core 10 can be stably formed.

Further, the thick thickness of the lower portion 11 of the insulating elastic core 10 acts to be pressed only to a certain level by the external pressure, so that the upper portion 12 becomes as horizontal as possible when the object contacts the opposing object.

The through holes (15, 16) passing through the inside of the insulative elastic core (10) may be circular or elliptical.

According to this structure, the pressure applied by the printed circuit board 1 ', which is in contact with the upper surface of the insulative elastic core 10, is dispersed outside the both sides of the insulative elastic core 10 to form the through holes 15 and 16 It is possible to prevent the upper portion of the insulating elastic core 10 from tilting to one side.

That is, two through-holes 15 and 15 are formed on both sides of the non-foamed rubber layer, and the electrical contact terminals are tilted to one side when the electrical contact terminals are soldered between the printed circuit boards 1 and 1 ' Can be prevented and is very stable

In addition, the lower central portion of the through holes 15, 16 is inclined at a predetermined distance from the center to both sides. According to this structure, the center portion of the upper portion 12 can be kept flat without being depressed by the pressure applied to the upper surface of the insulating elastic core 10. Further, the lower portion 11 of the insulating elastic core 10 can be divided into a balanced weight.

The thickness of both side portions 13 of the through holes 15 and 16 of the insulating elastic core 10 is formed to be similar to the thickness of the upper and lower portions 11 and 12 so as to improve stability .

The insulation non-foamed rubber coating layer 20 is located between the insulating elastic core 10 and the metal layer 30 and reliably bonds the insulating elastic core 10 and the metal layer 30.

The insulation non-foamed rubber coating layer 20 should have no change in adhesive force even at the reflow soldering temperature and should always maintain elasticity. Preferably, the hardness of the fully cured insulated non-foamed rubber coating layer 20 for flexibility and elasticity is 20 to 40 Shore A and a thickness of about 0.02 to 0.1 mm.

The insulated non-foamed rubber coating layer 20 may be formed by curing, and may be selected from silicone rubber which is cured by heat or silicone rubber which is cured by moisture. Preferably, a type that is fully cured by heat is used to increase the working speed.

The liquid silicone rubber has adhesion with an opposing object while being cured and is formed of a solid insulated nonfoamed rubber coating layer 20 after curing and maintains elasticity after once curing and maintains adhesion even when heat is applied again. Preferably, an additive or the like is added to the liquid silicone rubber in order to obtain a reliable adhesive force, or the surface of an object to be bonded is subjected to a surface treatment such as a corona treatment and then adhered.

As shown in FIG. 2, both ends of the metal layer 30 are spaced apart from each other by a predetermined distance and bonded to the non-foamed rubber coating layer 20.

According to this structure, when the metal layer 30 is pressed and bonded to the insulating non-foamed rubber coating layer 20 while passing through a metal mold (not shown), both ends of the metal layer 30 Since the leakage 21 of the liquid non-foam rubber coating layer 20 protruding from the solid insulating non-foam rubber 20 is accommodated in the groove 14 formed by both ends of the separated metal layer 30, The solder is prevented from being disturbed by the leakage 21 of the coating layer 20.

The recesses 21 which are not soldered are accommodated by the grooves 14 to keep the lower surface of the insulative elastic core 10 in a plane to prevent lifting during reflow soldering and increase the soldering strength.

Preferably, such grooves 14 are formed in a rectangular shape symmetrically with respect to the center of the lower surface of the insulative elastic core 10 to provide a similar soldering strength on the left and right sides of the electrical contact terminal 100 after reflow soldering , And can accommodate a large amount of leaking water 21. Preferably, the width of the groove 14 is about 0.2 to 1.5 mm.

According to this structure, the upper surface and the lower surface of the electrical contact terminal 100 can be clearly distinguished by the groove 14, which is convenient for reel packaging.

The material of the metal layer 30 may include, for example, copper or other metal material. The thickness of the metal layer 30 is preferably set to, for example, 0.01 to 0.05 mm in consideration of flexibility and mechanical strength.

The metal layer 30 may be one kind of copper or may be plated with gold or gold or the like.

Alternatively, the metal layer 300 may be cut later and then be subjected to a barrel plating process (plating of screws or small parts) to raise the stones or gold.

Further, by dividing the metal layer 30 into a plurality of electrically insulated portions and dividing the grounding pattern into which the resilient electrical contact terminals are soldered into a plurality of grounding patterns having an insulating gap corresponding to each of the plurality of portions, The electrical contact terminal 100 may be used as a plurality of electrical contact terminals.

Preferably, the metal layer 30 may be comprised of a plurality of metal layers, and the outermost surface may comprise any one of tin, silver, or gold to facilitate corrosion prevention and reflow soldering.

Hereinafter, a method of manufacturing the elastic electrical contact terminal 100 having such a configuration will be described.

First, a liquid silicone rubber, which is hardened by moisture or heat, is applied on the surface of the metal layer 30 cut to have a constant width in a thickness of 0.02 mm to 0.1 mm to form a liquid insulated non-foam rubber coating layer 20.

At this time, if the thickness of the insulating non-foamed rubber coating layer 20 in the liquid phase is too thin, the adhesive force between the insulating elastic core 10 and the metal layer 30 will deteriorate. If the thickness is too thick, There is a disadvantage that a large amount of leaking water 21 is generated in the process.

Next, an insulative elastic core 10 having through holes 15 and 16 formed therein in a roll shape by an extrusion process is placed on a liquid insulated non-foamed rubber coating layer 20, and a fixed shape jig (Not shown).

As described above, the insulative elastic core 10 has the through holes 15 and 16 formed therein, and has the effect of lowering the hardness of the insulative elastic core 10. In addition, the size of the through-holes 15 and 16 can be adjusted to control the degree of pressing and the like, and since it is produced by extrusion, a small-sized product can be manufactured economically.

Thereafter, when the insulative elastic core 10 is passed through a metal mold (not shown) that is wrapped with the metal layer 30 and is heated, the liquid insulated non-foamed rubber coating layer 20 interposed therebetween is cured, Foamed rubber coating layer 20 to reliably adhere the insulating elastic core 10 and the metal layer 30 to each other.

Since the dimension of the metal mold is generally smaller or smaller than the dimension of the insulating elastic core 10, the liquid insulating foam coating layer 10 receives pressure while passing through the metal mold, And is then stored in the grooves 14 formed by both ends of the metal layer 30 on the bottom surface of the insulating elastic core 10 and then cured to form the leakage 21 of the solid insulating non-foamed rubber coating layer 20 ).

Preferably, the center of the groove 14 is located at the center of the lower surface of the insulative elastic core 10 and is symmetrical.

At this time, in order to accelerate the curing speed of the liquid silicone rubber located inside the mold, it is preferable to maintain the temperature of the mold at about 60 to 250 DEG C and maintain the ambient humidity at about 60%.

When the liquid non-foamed rubber coating layer 20 is once cured, the liquid non-foamed rubber coating layer 20 is not melted again by heat. Therefore, even when the electric contact terminal 100 is reflow soldered, the original adhesion performance is maintained and the elasticity is always maintained .

The electrical contact terminal 100 thus manufactured has a problem of wrinkling or the like due to the metal layer 30 having a too long length, so that it is usually manufactured to a length of 1 m or less and finally cut to a required length of 0.5 mm to 10 mm Can be used.

Thereafter, the insulating non-foamed coating layer 20 is completely cured by being left in a curing furnace of about 160 ° C for about 1 hour.

The liquid silicone rubber, which is preferably cured by moisture, can also shorten the curing time by applying heat.

The outer surface of the electrical contact terminal 100 thus fabricated is made of a metal layer 30 which is not easily oxidized and is easy to reflow solder. Since the main component of the metal layer 30 is copper, the electrical conductivity is good and the price is low.

In the first embodiment, since the heat-resistant silicone rubber is used as the material of the insulative elastic core 10 and the non-foamed rubber coating layer 20, electrical and mechanical performance is maintained as the electrical contact terminal 100 before and after reflow soldering. Further, the elastic core 10 and the non-foamed rubber coating layer 20 are excellent in elastic restoring force and are not melted by heat.

Preferably, the bottom surface of the electrical contact terminal 100 is in contact with the solder cream 3, and the top surface is planar so that reflow soldering by surface mounting by vacuum pick-up is possible.

The electric contact terminal 100 thus manufactured is cut to a desired length by a blade and reeled on a carrier tape.

The electrical contact terminal 100 is then surface mounted on the solder cream 3 of the printed circuit board 1 by vacuum pick-up and then attached to the printed circuit board 1 by reflow soldering.

Preferably, the ground pattern 2 on the printed circuit board 1 and the solder cream 3 are formed by dividing the solder cream 3 horizontally symmetrically with one or more insulation gaps (not shown) in the center.

That is, due to the insulation gap formed at the center of the ground pattern 2 and the solder cream 3, the phenomenon of lifting or tilting of the electrical contact terminal 100 by the solder cream 3 during reflow soldering is reduced. Preferably, the width of the insulation gap is 0.2 to 2 mm.

In the embodiment of the present invention, two through holes are formed on both sides of the foamed rubber layer, and are formed when the center space is not emptied, so that it is stable when the electrical contact terminals are soldered between the printed circuit boards.

In addition, in the embodiment of the present invention, the leakage of the insulating non-foamed rubber coating layer forms a groove in a rectangular shape so as to receive a sufficient amount in the groove formed by both ends of the spaced-apart metal layer 30.

FIG. 4 shows an example in which both edges of the upper and lower surfaces of the insulating elastic core 10 are rounded. FIG.

4 is a cross-sectional view of an elastic electrical contact terminal according to a second embodiment of the present invention.

Referring to FIG. 4, since both edges of the upper and lower surfaces of the insulative elastic core 10 are formed in a round shape, the angle of break of the metal layer is smooth, so that the manufacturing is easy and the probability of occurrence of cracks is reduced.

In the SMD process, the lead area becomes larger than the angular shape, so that it can be more advantageous for the current application.

The third embodiment will be described as follows.

FIG. 5 is a perspective view illustrating an elastic electrical contact terminal according to a third embodiment of the present invention, FIG. 6 is a cross-sectional view taken along the line B-B ' Sectional view showing the use state of the contact terminal.

5 to 7, the elastic electrical contact terminal 100 capable of reflow soldering according to the third embodiment of the present invention electrically connects the printed circuit boards 1 and 1 ' An extruded insulative elastic core 10, an insulated non-foamed rubber coating layer 20, and a metal layer 30 are sequentially laminated.

The insulative elastic core 10 may be formed in a tubular shape having two through holes 15 and 16 therein and may have a circular cross section, but is not limited thereto and may be provided by an extrusion process to have various shapes.

The material of the insulating elastic core 10 is preferably a non-foaming rubber in order to satisfy reflow soldering and elastic conditions.

The hardness of the material of the insulative elastic core 10 is preferably Shore A 40 to 70 for proper mechanical strength and elasticity and the pressing force of the upper surface of the insulative elastic core 10 is the same as that of the through holes 15 and 16 Can be reduced by size and shape.

2, the lower surface of the insulative elastic core 10 may be formed in a shape which is widened downward from both ends in the width direction.

Preferably, the grounding pattern 2 and the solder cream 3 are separated at the center by an insulation gap.

Further, the upper and lower edges of the insulating elastic core 10 may be rounded. According to this structure, it is easy to handle, and it is possible to prevent the engagement of the completed electrical contact terminal 100 on both sides in the process of being assembled with the opposing object after being soldered to the printed circuit board or the like.

The through holes 15 and 16 formed in the insulative elastic core 10 are preferably symmetrically formed on both sides from the center so that the elasticity of the insulative elastic core 10 can be stably formed.

Further, the thick thickness of the lower portion 11 of the insulating elastic core 10 acts to be pressed only to a certain level by the external pressure, so that the upper portion 12 becomes as horizontal as possible when the object contacts the opposing object.

The through holes (15, 16) passing through the inside of the insulative elastic core (10) may be circular or elliptical.

According to this structure, the pressure applied by the printed circuit board 1 ', which is in contact with the upper surface of the insulative elastic core 10, is dispersed outside the both sides of the insulative elastic core 10 to form the through holes 15 and 16 It is possible to prevent the upper portion of the insulating elastic core 10 from tilting to one side.

That is, two through-holes 15 and 15 are formed on both sides of the non-foamed rubber layer, and the electrical contact terminals are tilted to one side when the electrical contact terminals are soldered between the printed circuit boards 1 and 1 ' Can be prevented and is very stable

Further, the central portion of the lower unfoamed rubber layer of the through-holes 15, 16 is inclined at a predetermined distance from the center to both sides. That is, a bone is formed.

According to this structure, the center portion of the upper portion 12 can be kept flat without being depressed by the pressure applied to the upper surface of the insulating elastic core 10. In addition, the valley of the lower portion 11 of the insulating elastic core 10 becomes parallel so that the weight can be divided equally.

The thickness of both side portions 13 of the through holes 15 and 16 of the insulating elastic core 10 is formed to be similar to the thickness of the upper and lower portions 11 and 12 so as to improve stability .

The insulation non-foamed rubber coating layer 20 is located between the insulating elastic core 10 and the metal layer 30 and reliably bonds the insulating elastic core 10 and the metal layer 30.

The insulation non-foamed rubber coating layer 20 should have no change in adhesive force even at the reflow soldering temperature and should always maintain elasticity. Preferably, the hardness of the fully cured insulated non-foamed rubber coating layer 20 for flexibility and elasticity is 20 to 40 Shore A and a thickness of about 0.02 to 0.1 mm.

The insulated non-foamed rubber coating layer 20 may be formed by curing, and may be selected from silicone rubber which is cured by heat or silicone rubber which is cured by moisture. Preferably, a type that is fully cured by heat is used to increase the working speed.

The liquid silicone rubber has adhesion with an opposing object while being cured and is formed of a solid insulated nonfoamed rubber coating layer 20 after curing and maintains elasticity after once curing and maintains adhesion even when heat is applied again. Preferably, an additive or the like is added to the liquid silicone rubber in order to obtain a reliable adhesive force, or the surface of the object to be adhered is subjected to a surface treatment such as corona treatment, and then the adhesive is adhered.

As shown in FIG. 6, both ends of the metal layer 30 are spaced apart from each other by a predetermined distance and bonded to the non-foamed rubber coating layer 20.

According to this structure, when the metal layer 30 is pressed and bonded to the insulating non-foamed rubber coating layer 20 while passing through a metal mold (not shown), both ends of the metal layer 30 Since the leakage 21 of the liquid non-foam rubber coating layer 20 protruding from the solid insulating non-foam rubber 20 is accommodated in the groove 14 formed by both ends of the separated metal layer 30, The solder is prevented from being disturbed by the leakage 21 of the coating layer 20.

Here, since the groove 14 is positioned on the upper portion of the electrical contact terminal, it becomes more difficult for the leakage of the leaking product 21 to the outside.

By the grooves 14, the leaking material 21 which is not soldered is stably received, and the upper surface of the insulative elastic core 10 is maintained in a plane to prevent lifting and the like in reflow soldering and increase the soldering strength .

Preferably, such grooves 14 are formed in a right-left symmetrical shape with respect to the center of the top surface of the insulative elastic core 10 to provide a similar soldering strength on the left and right sides of the electrical contact terminal 100 after reflow soldering , And can accommodate a large amount of leaking water 21. Preferably, the width of the groove 14 is about 0.2 to 1.5 mm.

According to this structure, the upper surface and the lower surface of the electrical contact terminal 100 can be clearly distinguished by the groove 14, which is convenient for reel packaging.

Referring to FIG. 7, the third embodiment of the present invention is a soldering portion at the bottom.

In addition, since the insulative elastic body is extruded, the size is not always constant. Therefore, when the film is wrapped with the film, the separation distance varies according to the lot. Particularly, when it is shifted to one side, the bonding strength is weakened because one side of the SMD process is less loaded with solder.

In contrast, in the third embodiment of the present invention, the metal layer is separated from the upper surface in order to prevent defects in such a process. The bottom surface may be an isosceles triangle shape, a flat shape, or a rectangular shape at a flat middle portion It may be a triangular part.

In the third embodiment of the present invention, two through holes are formed on both sides of the non-foamed rubber layer, and it is stable when the electrical contact terminals are soldered between the printed circuit boards by forming the center space without emptying.

Further, in the embodiment of the present invention, the leakage of the insulation non-foamed rubber coating layer may be collected in the groove formed by both ends of the metal layer spaced from the upper part.

Further, in the embodiment of the present invention, it is possible to form the groove on the upper part with a rectangular structure so as to accommodate a sufficiently large amount, and to prevent the leakage of the leaking water to the outside.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. Such changes and modifications are intended to fall within the scope of the present invention unless they depart from the scope of the present invention.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It belongs to the scope of right.

Claims (8)

An insulated elastic core having two through holes formed therein;
An insulating non-foamed rubber coating layer wrapped around the insulating elastic core;
And a metal layer formed to surround the insulated non-foamed rubber coating layer,
The metal layer is adhered to the insulation non-foamed rubber coating layer while both ends thereof are spaced apart from each other by a predetermined distance,
The spaced apart ends are vertically cut down,
Wherein the metal layer is one of copper, copper-plated or copper-plated, and has a thickness of 0.01 to 0.05 mm. The method according to claim 1,
Wherein the groove has a rectangular cross-section. 3. The method of claim 2,
Characterized in that when the metal layer is adhered to the insulated non-foamed rubber coating layer, the leakage of the insulating non-foamed rubber coating layer protruding from both ends of the metal layer is accommodated in the groove formed by both ends of the separated metal layer. Elastic electrical contact terminals. delete The method according to claim 1,
Wherein an upper surface side edge of the insulating elastic core is rounded. The method according to claim 1,
Wherein the through holes are formed in the central portion of the insulative elastic core such that the through holes are symmetrical to each other. The method according to claim 1,
And a soft corrugation is formed in the lower center of the insulative elastic core. An insulated elastic core having two through holes formed therein;
An insulating non-foamed rubber coating layer wrapped around the insulating elastic core;
And a metal layer adhered to the insulated non-foamed rubber coating layer so as to surround the insulated non-foamed rubber coating layer,
Wherein the metal layer is adhered to the insulating non-foamed rubber coating layer while both ends of the metal layer in contact with the upper portion of the insulating elastic core are spaced apart from each other by a predetermined distance,
The spaced apart ends are vertically cut down,
Wherein the metal layer is one of copper, copper-plated or copper-plated, and has a thickness of 0.01 to 0.05 mm.

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