CN116259992A

CN116259992A - Solderable elastic electric contact terminal

Info

Publication number: CN116259992A
Application number: CN202211578368.7A
Authority: CN
Inventors: 金镇山; 朴炳柱; 金亨圭; 金善基
Original assignee: Joinset Co Ltd
Current assignee: Joinset Co Ltd
Priority date: 2021-12-09
Filing date: 2022-12-09
Publication date: 2023-06-13
Also published as: KR102638217B1; KR20230087209A

Abstract

Disclosed is a solderable elastic electric contact terminal capable of minimizing crack generation of a metal layer even if a core is press-folded. In the electric contact terminal, a non-adhesive portion in which the polymer film and the core are not adhered to each other is formed in the length direction from the left and right side walls of the core, wherein in the non-adhesive portion, the polymer film is independent with respect to folding of the core caused by a force applied to the electric contact terminal in the vertical direction.

Description

Solderable elastic electric contact terminal

Technical Field

The invention relates to a solderable elastic electric contact terminal, and particularly discloses a technology capable of reducing crack generation of a metal layer even if an upper object presses a core in a vertical direction to fold the core.

Background

In general, solderable elastic electric contact terminals are required to have good conductivity, excellent elastic restoring force, and to be able to withstand soldering temperatures.

In particular, when the object is sandwiched between objects having conductivity facing in the vertical direction and the objects press the electric contact terminals in the vertical direction, the electric contact terminals electrically connect the objects in a state having low resistance.

Fig. 1 shows an example of a conventional elastic electric contact terminal according to the present invention.

As shown in the enlarged view within the circle, the electrical contact terminal 200 is configured to include: an elastic core 210 having a tubular shape with a through hole 215 formed therein along the longitudinal direction; a heat-resistant polymer film 230 bonded by sandwiching the adhesive layer 220 to surround the core 210; and a metal layer 240 formed on an outer surface of the polymer film 230.

If lower portions of both sides of the electric contact terminal 200 are placed on the solder paste 20 on the

separation patterns

10, 12 of the circuit substrate by vacuum pickup and reflow soldering is performed, the solder paste 20 adhered to the metal layer 240 is soldered on the

separation patterns

10, 12 while being cooled after being melted, and mounted.

When the conventional electrical contact terminal 200 is pressed by the pressing force in the vertical direction from the object on the upper side, the core 210 is folded at the position where the stress caused by the applied force is concentrated, and the polymer film 230 and the metal layer 240 adhered to both side surfaces of the core 210 are similarly folded at the adjacent positions.

The portion where the core 210 is folded differs depending on the size and shape of the electric contact terminal 200 and the core 210, the size or shape of the through hole 215 formed in the core 210, and the like, and when the electric contact terminal 200 is welded, the lower end of the electric contact terminal 200 is fixed by welding, and thus can be determined by welding.

As described above, the core 210 and the polymer film 230 are bonded by the adhesive layer 220, and the core 210 and the polymer film 230 are moved by an external force not independently of each other, and if the core 210 is folded by being pressed by a force applied in a vertical direction from the upper portion, the polymer film 230 adjacent to the portion where the core 210 is pressed to be folded and the metal layer 240 formed on the polymer film 230 are also pressed to be folded.

Further, if repeated force is applied to the electrical contact terminal 200, the corresponding portion of the core 210 is repeatedly folded, and thus, the corresponding portion of the metal layer 240 is also repeatedly folded, and thus, the metal layer 240 is cracked (Crack) along the corresponding portion of the metal layer 240, thereby increasing resistance, and in severe cases, the corresponding portion of the metal layer 240 is cut off due to the Crack, thereby causing electrical connection to be broken or resistance to become large.

As described above, the conventional electrical contact terminal 200 has a disadvantage in that the core 210 and the polymer film 230 are adhered by the adhesive layer 220, and thus, the polymer film 230 is folded together at a portion (for example, at a welded portion) where a large amount of force repeatedly applied in a vertical direction is provided to fold the core 210, and thus, the metal layer 240 at the portion is easily cracked.

Disclosure of Invention

Accordingly, an object of the present invention is to provide an elastic electrical contact terminal capable of dispersing or minimizing the occurrence of cracks in a metal layer at a folded portion of a core even if the core is repeatedly folded with repeated pressurization in a vertical direction.

Another object of the present invention is to provide a flexible electrical contact terminal that minimizes the variation in resistance of the metal layer in the vertical direction with repeated pressurization in the vertical direction, reliably and economically.

Another object of the present invention is to provide an elastic electrical contact terminal that minimizes a change in resistance of a metal layer in a vertical direction by an external force.

According to one aspect of the present invention, there is provided a solderable elastic electric contact terminal characterized by: comprising the following steps: an elastic core having a tubular shape of a through hole formed in a longitudinal direction; a heat-resistant polymer film bonded by sandwiching an elastic adhesive layer to surround the core; and a metal layer formed on an outer surface of the polymer film, wherein a non-adhesive portion where the polymer film and the core are not adhered to each other is formed in at least a portion of both side walls of the core of the electrical contact terminal in a length direction, and in the non-adhesive portion, folding of the polymer film includes a case of being independent of folding of the core caused by a force applied in a vertical direction from an upper portion of the electrical contact terminal.

According to other aspects of the present invention, there is provided a solderable elastic electric contact terminal characterized by: comprising the following steps: an elastic core; a heat-resistant polymer film bonded by sandwiching an elastic adhesive layer to surround the core; and a metal layer formed on an outer surface of the polymer film, wherein a non-adhesive portion is formed with a heat-resistant reinforcing member extending in the longitudinal direction between the adhesive and the core in at least a portion of both side walls of the core of the electric contact terminal, and wherein the polymer film is independent of folding of the core caused by a force applied in a vertical direction from an upper portion of the electric contact terminal in the non-adhesive portion.

According to a further aspect of the present invention, there is provided a solderable elastic electric contact terminal characterized by: comprising the following steps: an elastic core; a heat-resistant polymer film bonded by sandwiching an elastic adhesive layer to surround the core; and a metal layer formed on an outer surface of the polymer film, wherein non-adhesive portions where the polymer film and the core are not adhered to each other are symmetrically formed in a length direction at both sides of the core of the electric contact terminal, and in the non-adhesive portions, folding of the polymer film is not folded or minimized independently of folding of the core caused by a force applied in a vertical direction from an upper portion of the electric contact terminal.

Preferably, the non-adhesive portion may be formed throughout the sidewall, and the non-adhesive portions of the both sidewalls may be configured to be symmetrical to each other.

Preferably, the lower end of the non-adhesive portion may be located at upper and lower portions adjacent to a boundary point of a portion where solder is formed on the sidewall.

Preferably, in the non-adhesive portion, at least one protrusion extending in the length direction may be formed at an outer side surface of the side wall of the core.

Preferably, a plate-shaped metal clip may be provided on a lower surface of the electric contact terminal to contact the metal layer, and both ends of the metal clip may be clamped at both ends of the through hole in a length direction.

Preferably, the wall thickness of the side wall in the non-bonded portion may be thinner than that of the other side walls, or the side wall of the core may be curved inward in the non-bonded portion.

Preferably, the reinforcing member may be adhered to the polymer film by sandwiching the adhesive layer, may be other polymer film, a wire (Thread), or a Rod (Rod), in the case of polymer film, cracks of the metal layer are reduced by increasing mechanical strength of the electric contact terminal, and the electric contact terminal is widened in a width direction by an applied force.

Preferably, the core may be a tubular silicone rubber having a through hole formed therein in the longitudinal direction, or may be a foam rubber having no through hole formed therein.

According to the present invention, even if the electrical contact terminal is folded by repeatedly applying force in the vertical direction, since the polymer film and the metal layer are independent with respect to the folding of the core in the non-adhesive portion, the folding of the metal layer can be dispersed or minimized by the folding of the core, thereby minimizing cracks of the metal layer and thus minimizing the variation of the resistance of the metal layer in the vertical direction.

Further, since the heat-resistant reinforcing member makes the folding of the polymer film and the metal layer relative to the core more independent, the variation in resistance of the metal layer in the vertical direction is minimized.

Further, the non-adhesive portion is reliably and economically formed by the heat-resistant reinforcing member, and the metal layer is protected from an external force by the mechanical strength of the heat-resistant reinforcing member, thereby minimizing the variation in resistance of the metal layer in the vertical direction.

Drawings

Fig. 1 shows an example of a conventional elastic electrical contact terminal.

Fig. 2 shows an electrical contact terminal according to an embodiment of the invention.

Fig. 3 shows the result of being pressed by the object.

Fig. 4 shows an electrical contact terminal according to another embodiment of the invention.

Fig. 5 shows an electrical contact terminal according to a further embodiment of the invention.

Fig. 6a and 6b show a variant of the electrical contact terminal, respectively.

Symbol description

100: electrical contact terminal

110: core(s)

120: adhesive layer

130: polymer film

140: metal layer

Detailed Description

The technical terms used in the present invention are only for the description of specific embodiments, and it should be noted that the present invention is not limited thereto. Further, the technical terms used in the present invention should be construed as meaning generally understood by those having a basic knowledge in the art to which the present invention pertains without other special definitions in the present invention, and should not be construed as meaning excessively generalized or excessively contracted. In addition, in the case where a technical term used in the present invention is an erroneous technical term that cannot accurately express the idea of the present invention, it should be understood instead of a technical term that can be correctly understood by those skilled in the art. Furthermore, the general terms used in the present invention should be interpreted according to definitions in a dictionary or according to the context, and should not be interpreted as excessively contracted meanings.

The present invention will be described in detail below with reference to the drawings.

Fig. 2 shows an electrical contact terminal according to an embodiment of the present invention, and fig. 3 shows a result of the electrical contact terminal being pressed by an object in a vertical direction.

The electric contact terminal 100 is constituted to include an elastic core 110, a heat-resistant polymer film 130 bonded by an elastic adhesive layer 120 so as to surround the core 110, and a solderable metal layer 140 is integrally formed on an outer surface of the polymer film 130, and opposite surfaces thereof are bonded to the core 110 by sandwiching the adhesive layer 120.

Hereinafter, the respective configurations of the electrical contact terminal 100 will be specifically described.

The material of the core 110 may be a non-foaming heat-resistant elastic rubber (e.g., silicone rubber) that forms a through hole having heat resistance and elasticity for reflow soldering.

For vacuum pickup of the electric contact terminal 100, at least a portion of the upper surface of the core 110 is formed flat in a horizontal manner, preferably, the lower surface of the core 110 is formed to protrude upward from both side edges toward the center portion with an inclination, both side portions of the lower surface are placed on the circuit substrate, and the metal layer 140 formed at this portion becomes a solder.

Preferably, the polymer film 130 may be spaced at the center of the lower surface of the core 110 so as to be less wobbled and not offset in one direction when the reflow soldering is performed.

The cores 110 may be formed so as to be laterally symmetrical, and may be formed so that the weights of the cores are substantially similar or identical with respect to the vertical center line in the cross section, so that the wobbling is small and the cores are not offset in one direction during reflow soldering.

As shown in fig. 2, the solder portion of the metal layer 140 formed on the lower surface of the core 110 is mounted on each of the

conductive patterns

10, 12 of the circuit substrate indicated by a broken line by means of the solder 20.

Preferably, the core 110 may be formed with the through-holes 112 penetrating in the longitudinal direction of the core 110 and be formed in a tubular shape, and may be applied to a foam core such as a sponge in which the through-holes 112 are not formed.

The adhesive layer 120 is located between the core 110 and the inner surface of the polymer film 130, thereby reliably bonding the core 110 and the polymer film 130, and also maintaining adhesion and elasticity before and after welding.

The adhesive layer 120 may be formed using an elastic rubber having heat resistance, and may be formed by, for example, thermally curing a liquid silicone rubber that adheres to an opposing object while being cured, and forms a solid heat-resistant rubber adhesive after curing, and retains elasticity after curing once, and also retains adhesive force even if heat is applied again.

For example, the polymer film 130 may be a Polyimide (PI) film or other heat resistant polymer film capable of adapting to the soldering temperature.

A metal layer 140 capable of being soldered by a solder paste may be integrally formed on the outer surface of the polymer film 130, and for example, may be provided by coating and curing a liquid polymer corresponding to the polymer film on a copper foil used as the metal layer 140.

Wherein, the metal layer 140 may be a copper layer or a copper foil formed by plating, and the metal layer 140 and the polymer film 130 are firmly adhered so that the metal layer 140 is not separated from the polymer film 130 after welding.

Preferably, the outermost layer of the metal layer 140 may be a plating layer of tin, silver or gold in order to facilitate reflow soldering by solder paste while preventing corrosion of the copper foil.

According to the present invention, as shown in the enlarged circle of fig. 2, it is preferable that the non-adhesive portions 122 where the polymer film 130 and the core 110 are not adhered to each other are symmetrically formed on both side walls 115 of the core 110, and the non-adhesive portions 122 have a predetermined width with respect to the side walls 115 and extend in the length direction.

The longitudinal direction refers to a direction vertically entering or leaving the screen in a width direction crossing the width of the electric contact terminal 100 in fig. 2, and the metal layer 140 is formed in the longitudinal direction.

Further, the non-adhesive portion 122 refers to a portion to which an adhesive has been applied but is not sufficiently applied to actually contribute to adhesion with the core 110, except for a portion to which an adhesive has not been applied at all.

The non-adhesive portions 122 are formed on both side walls 115 of the core 110, and the width in which the non-adhesive portions 122 are formed is not particularly limited, but may be formed in such a manner as to include a position where folding of the side walls 115 of the core 110 (hereinafter, simply referred to as folding of the core) is likely to occur, or may be formed on the entire side walls 115.

Preferably, the lower end of the non-adhesive portion 122 may be located at upper and lower portions adjacent to the boundary point of the portion of the sidewall 115 where the solder 20 is formed.

In particular, in the case where the lower end of the non-adhesive portion 122 is located below the boundary point of the portion where the solder 20 is formed in the side wall 115, since the core 110 may be separated from the polymer film 130 at this position and moved inward, the polymer film 130 may be relatively independent of the folding of the side wall 115 of the core 110.

As shown in this embodiment, by forming the non-adhesive portion 122 where the polymer film 130 and the core 110 are not adhered to each other at both side wall 115 portions of the electric contact terminal 100, even if the electric contact terminal 100 is applied with force in the vertical direction to fold the core 110, since the polymer film 130 and the metal layer 140 adhered thereto are independent with respect to the folding of the core 110 in the non-adhesive portion 122, the metal layer 140 is not folded or folded to be dispersed even if the core 110 is folded, so that it is possible to minimize the crack of the metal layer 140 formed in the length direction, with the result that the cutting caused by the crack can be prevented.

In the present invention, the cracks of the metal layer 140 include cracks in which the metal layer is completely cut, cracks in which the metal layer is partially cut, or cracks in which the thickness is thinned, and are interpreted as an increase in resistance or a deterioration in appearance of the metal layer 140 in the up-down direction, or the like. For example, the electric contact terminal 100 serves to connect objects facing in the vertical direction so as to have a small resistance, and if a crack in the metal layer 140 occurs along the longitudinal direction of the metal layer, the upper and lower resistances of the metal layer 140 are increased by about several m to several k from the original resistance.

This will be described in detail with reference to fig. 3.

As shown by the arrow, when the electric contact terminal 100 is repeatedly pressed by the object in the vertical direction, the weak portion of the core 110 horizontally expands on both sides in the width direction, and at the same time, the portion where the stress due to the pressing force is concentrated is pushed inward and folded, for example, in this embodiment, the side wall 115 of the core 110 corresponding to the lower end of the through hole 112 is pushed inward and folded.

The position where the core 110 is folded is not constant, and a portion where stress due to a pressing force is most concentrated on the sidewall 115 of the core 110 is folded according to the size and shape of the electric contact terminal 100, the thickness of the polymer film 130 and the metal layer 140, and the size or shape of the through hole 112, the wall thickness of the core 110, and the position of a boundary point of a portion covered with the solder 20, and the like.

As the polymer film 130 and the metal layer 140 are formed with the non-adhesive portion 122 between the folded position of the core 110 and the core 110, as opposed to the case where the core 110 is folded by the applied force, as viewed from within the enlarged circle of fig. 3, the polymer film 130 and the metal layer 140 are not folded or are folded less to be inconsistent with the folding of the core 110, and the remaining portion of the polymer film 130 is instead pressed to the outside by the folding of the core 110, so that the space volume of the non-adhesive portion 122 may be increased.

Finally, even if the core 110 is repeatedly folded at the corresponding position, the occurrence of cracks on the metal layer 140 can be reduced.

Although not shown, a plate-shaped metal clip that can be welded may be provided on the lower surface of the electric contact terminal 100 to contact the metal layer 140, and both ends of the metal clip may be sandwiched between both ends of the through hole 112 in the longitudinal direction.

In this case, the soldering of the electrical contact terminal 100 is performed on the lower end surface of the metal clip, and the crack of the metal layer 140 is reduced by the non-adhesive portion 122 after the soldering.

According to this embodiment, as shown in an enlarged circle of fig. 4, the non-adhesive portion 122 is formed by the reinforcing member 150 having heat resistance extending in the length direction.

The reinforcement member 150 may be a heat-resistant polymer film, a wire (Thread), or a round bar (Rod), and is adhered to the polymer film 130 by sandwiching the adhesive layer 120. For example, a liquid adhesive is coated on one surface of the polymer film 130, the reinforcing member 150 is continuously placed thereon, the core 110 is continuously surrounded with the polymer film 130 and thermally cured, and then the liquid adhesive is cured to form the adhesive layer 120, and the portion where the reinforcing member 150 is located becomes the non-adhesive portion 122 where the core 110 and the polymer film 130 are not directly adhered by the reinforcing member 150. Thereby, the reinforcing member 150 and the core 110 are not bonded.

In order to provide the size and the manufactured product of the non-adhesive portion 122 with reliability and with economy, it is preferable that the reinforcing member 150 is a polyimide film or a heat-resistant film having a uniform width and thickness.

In the case where the reinforcing member 150 is a film, the thickness may be 0.008mm to 0.1mm, and the width may be 1.2mm or more.

The reinforcing member 150 of the polymer film reduces cracks of the metal layer 140 by improving mechanical strength of the electrical contact terminal and is widened in the width direction of the electrical contact terminal by an applied force.

Preferably, the width of the reinforcing member 150 is smaller than the height dimension of both side walls of the core 110, and the dimensions of the reinforcing members 150 located at both side walls are formed to be identical to each other and symmetrical to each other so as to be pressed into the same shape on both side walls when the electric contact terminal 100 is pressed.

According to this structure, as shown in fig. 4, when the core 110 is pressed by the object and the side wall of the core 110 is opened to the outside in the non-adhesive portion 122, the polymer film 130 is supported by the mechanical strength of the reinforcing member 150, so that the folding of the polymer film 130 can be reduced or dispersed.

Further, in the portion where the reinforcing member 150 is formed, since the core 110 and the polymer film 130 are not adhered to each other, the folding of the core 110 and the folding of the polymer film 130 are independent, so that the generation of cracks of the metal layer 140 at the portion where the core 110 is folded can be reduced or dispersed.

In addition, the reinforcing member 150 having mechanical strength may function to protect the metal layer 140 located at the portion where the reinforcing member 150 is formed from another external force.

According to this embodiment, in the non-adhesive portion 122, at least one protrusion 111 extending in the length direction at both side surfaces of the core 110 is formed to protrude apart from each other.

According to this structure, even if a part of the adhesive layer 120 remains on the non-adhesive portion 122 during the manufacturing process, it is possible to adhere only on the adhesive layer 120 remaining on the end portion of the protrusion 111, thereby easily securing the non-adhesive portion 122.

For example, since the adhesive layer 120 is formed by curing by applying a liquid adhesive to the polymer film 130, it is difficult to provide the non-adhesive portion 122 of a predetermined width, so that this disadvantage can be solved by forming the protrusion 111.

Finally, even if the core 110 is folded, the non-adhesive portion 122 can be always reliably ensured by the protrusion 111, and thus, unlike the folding of the core 110, the polymer film 130 and the metal layer 140 may not be folded or scatter-folded.

In addition, there is an advantage in that the folding position and degree of the core 110 can be adjusted and the folding can be dispersed by the number, position and shape of the protrusions 111.

Fig. 6a and 6b show a variant of the electrical contact terminal, respectively.

As seen in fig. 6a, the wall thickness of the sidewall 115a of the core 110 at the non-bonded portion 122 is thinner than the wall thickness of the sidewall at the other portions.

According to this structure, in the non-adhesive portion 122, the wall thickness of the side wall 115a of the core 110 is thinner, and therefore the folded portion of the core 110 can be guided to the portion of the thinner wall thickness by the force applied to the electrical contact terminal 100 in the vertical direction, and finally, the folded portion of the core 110 can be predicted, and the folding of the polymer film 130 caused by the folding of the core 110 can be reduced or dispersed by taking the portion as the non-adhesive portion 122. Thus, when the electric contact terminal is repeatedly pressed in the vertical direction, the occurrence of cracks of the metal layer 140 can be reduced.

Referring to fig. 6b, in the non-adhesive portion 122, the sidewall 115b of the core 110 may be bent inward.

According to this structure, in the non-adhesive portion 122, the side wall 115b of the core 110 can be bent to the inside, and thus the folded portion of the core 110 is likely to be a bent portion by the force applied to the electrical contact terminal 100 in the vertical direction, and finally, the folded portion of the core 110 can be predicted, and the folding of the polymer film 130 caused by the folding of the core 110 can be reduced or dispersed by taking the portion as the non-adhesive portion 122.

The embodiment has described the case where the through-holes are formed on the core 110, but even in the case where the core 110 is a foamed rubber in which the through-holes are not formed, the non-adhesive portions 122 may be symmetrically formed on both sides of the foamed rubber, and the foamed rubber and the polymer film 130 may be independently folded by a vertically applied force, so that cracks of the metal layer 140 may be reduced or dispersed as a whole, and eventually an increase in the up-down resistance of the electric contact terminal may be reduced.

In this case, the foaming rubber as the core 110 has a quadrangular shape, and is folded at 1/2 height of the foaming rubber, i.e., at the most in the central portion of the height, by an external force applied vertically.

This has an advantage in that even in the case of using the foamed rubber, the reinforcing member 150 can be applied to both sides of the foamed rubber, so that the non-adhesive portion 122 can be reliably and economically formed, and the pressing force and range of the electric contact terminal can be partially adjusted by the width and thickness of the reinforcing member 150.

While the embodiments of the present invention have been described above mainly, it is obvious that various modifications can be made by those skilled in the art. Accordingly, the scope of the claims of the present invention should not be construed as limited to the above-described embodiments, but should be construed by the scope of the claims set forth below.

Claims

1. A solderable elastic electrical contact terminal, comprising:

a core having a tubular shape with a through hole formed in a longitudinal direction and having elasticity;

a polymer film bonded by sandwiching an elastic adhesive layer so as to surround the core and having heat resistance; and

a metal layer formed on the outer surface of the polymer film,

wherein a non-adhesive portion where the polymer film and the core are not adhered to each other is formed in at least a part of both side walls of the core of the electric contact terminal in a length direction,

and, in the non-adhesive portion, the folding of the polymer film includes a case independent of the folding of the core caused by a force applied in a vertical direction from an upper portion of the electrical contact terminal.

2. The solderable elastic electric contact terminal according to claim 1, wherein,

the non-adhesive portion is formed throughout the sidewall.

3. The solderable elastic electric contact terminal according to claim 1, wherein,

the non-adhesive portions of the sidewalls are configured to be symmetrical to each other.

4. The solderable elastic electric contact terminal according to claim 1, wherein,

the lower end of the non-adhesive portion is located at the upper and lower portions adjacent to the boundary point of the portion where the solder is formed on the side wall.

5. The solderable elastic electric contact terminal according to claim 1, wherein,

in the non-adhesive portion, at least one protrusion extending in the length direction is formed on an outer side surface of the side wall of the core.

6. The solderable elastic electric contact terminal according to claim 1, wherein,

in the non-adhesive portion, the folding of the polymer film with respect to the core is independent so that cracks generated in the metal layer are reduced or dispersed to generate.

7. The solderable elastic electric contact terminal according to claim 6, wherein,

cracks of the metal layer are generated along the length direction of the metal layer.

8. The solderable elastic electric contact terminal according to claim 1, wherein,

a plate-shaped metal clip is provided on the lower surface of the electric contact terminal so as to be in contact with the metal layer, and both ends of the metal clip are sandwiched between both ends of the through hole in the longitudinal direction.

9. The solderable elastic electric contact terminal according to claim 1, wherein,

the wall thickness of the side wall at the non-adhesive portion is thinner than the wall thickness of the other side walls.

10. The solderable elastic electric contact terminal according to claim 1, wherein,

in the non-adhesive portion, the side wall of the core is curved inward.

11. The solderable elastic electric contact terminal according to claim 1, wherein,

the upper and lower resistances of the metal layer are changed by the cracks of the metal layer.

12. A solderable elastic electrical contact terminal, comprising:

a core having elasticity;

a metal layer formed on the outer surface of the polymer film,

wherein a heat-resistant reinforcing member extending in a longitudinal direction is formed between the adhesive and the core in at least a part of both side walls of the core of the electric contact terminal to form a non-adhesive portion,

and, in the non-adhesive portion, the polymer film is independent of folding of the core caused by a force applied in a vertical direction from an upper portion of the electrical contact terminal.

13. The solderable elastic electric contact terminal according to claim 12, wherein,

the reinforcing member is bonded to the polymer film by sandwiching the adhesive layer.

14. The solderable elastic electric contact terminal according to claim 12, wherein,

the reinforcing member is other polymeric film, wire or rod.

15. The solderable elastic electric contact terminal according to claim 14, wherein,

the other polymer film increases the mechanical strength of the electrical contact terminal to reduce cracking of the metal layer.

16. The solderable elastic electric contact terminal according to claim 14, wherein,

the other polymer film widens the electrical contact terminal in the width direction by the applied force.

17. The solderable elastic electric contact terminal according to claim 12, wherein,

the reinforcing members of the side walls are configured to be symmetrical to each other.

18. A solderable elastic electrical contact terminal, comprising:

a core having elasticity;

a metal layer formed on the outer surface of the polymer film,

wherein non-adhesive portions where the polymer film and the core are not adhered to each other are symmetrically formed in a length direction on both sides of the core of the electric contact terminal,

and, in the non-adhesive portion, the folding of the polymer film is not folded or minimized independently of the folding of the core caused by the force applied in the vertical direction from the upper portion of the electrical contact terminal.

19. The solderable elastic electric contact terminal according to claim 18, wherein,

the core is a tubular silicone rubber having a through hole formed therein in the longitudinal direction, or a foam rubber having no through hole formed therein.

20. The solderable elastic electric contact terminal according to claim 18, wherein,

the non-adhesive portion is formed by being bonded by the heat-resistant reinforcing member via the adhesive.