KR102675798B1 - Elastic electric contact terminal having minimizing metal crack - Google Patents

Abstract

An elastic electrical contact terminal that does not affect the metal layer even when the core is pressed by an external force is disclosed. The electrical contact terminal is composed of an elastic core, a heat-resistant polymer film that surrounds the core and is adhered to the upper and lower surfaces of the core through an adhesive layer, and a metal layer formed on the outer surface of the polymer film, and the inside of the core has a length. A through hole penetrating along the direction is formed, and at least one side wall of the core is pressed inward to form a folded portion, and a space is formed between the inner surface of the polymer film and the side wall of the core by the folded portion.

Description

Elastic electric contact terminal having minimizing metal crack}

The present invention relates to an elastic electrical contact terminal, and particularly to an elastic electrical contact terminal that can minimize the occurrence of cracks in the metal layer even when the elastic electrical contact terminal is pressed in the vertical direction by an external force.

In general, an elastic electrical contact terminal capable of soldering must be capable of vacuum pickup for surface mounting, have low electrical resistance, excellent resilience due to elasticity, withstand soldering temperature, and have high soldering strength after soldering.

In addition, it should preferably be pressed in as wide a range as possible, the pressing force should be small, and the restoring force after pressing should be good.

In particular, when the object is sandwiched between electrically conductive objects facing in the vertical direction and presses the electrical contact terminal in the vertical direction, the electrical contact terminal must electrically connect the upper and lower objects with low electrical resistance.

Such an electrical contact terminal includes Korean Patent No. 10-1001354 of the present applicant.

When the above electrical contact terminal is pressed by vertical pressure from an object above, the core is folded or stress is concentrated in areas where the applied force tends to spread laterally or where stress is concentrated.

If this folding due to pressing occurs repeatedly and stress is concentrated, damage such as cracks may occur in the metal layer at these areas.

For example, stress is likely to be concentrated in the soldering or soldering area, and if the film and the core are fully bonded, the metal layer located in the core area where a lot of stress or force is applied is severely deformed.

To solve this problem, as in the present applicant's Korean Patent No. 10-0993253, only the heat-resistant polymer film is adhered to the insulating non-foam rubber coating layer in the part where the heat-resistant polymer film is bent into an arc shape by wrapping around the side of the heat-resistant polymer film. A space is formed between the insulating elastic core or, as in Korean Patent No. 10-2212351 of the present applicant, the polymer film or metal foil is not adhered to both sides of the core at the part where both sides of the core are wrapped and bent into an arc shape. We are creating a space.

In addition, as in Korean Patent No. 10-2324261, a non-conductive coating layer is formed to cover the upper and lower surfaces and both sides of the elastic core, and a space is formed between the elastic core and the non-conductive coating layer on both sides of the elastic core. In particular, looking at Figure 2 of the patent, a space is formed in a part, and for this, the non-conductive coating layer, that is, the adhesive layer, is not adhered to the core in that part but protrudes convexly.

As such, there is a disadvantage in that the non-conductive coating layer protrudes convexly in some parts and it is difficult to prevent it from adhering to the core during the manufacturing process.

For example, after casting a liquid non-conductive coating layer to a uniform thickness on a polymer film, it continuously passes through the mold and wraps around the side wall of the core, making it difficult to manufacture it so that a portion of the side wall of the core protrudes convexly and does not adhere to the core. , there is a disadvantage that it is difficult to control the size and location of the space.

In addition, looking at Figure 3 of the patent, it is stated that when the electrical contact terminal is pressed from top to bottom, the core part corresponding to the space expands to the side and fills the space. However, when the actual core is pressed, not only a specific part expands. Since both sides are stretched laterally as a whole, it has the disadvantage that it is difficult to fill only the space and the metal layer is easily damaged.

In addition, when the electrical contact terminal is pressed a lot, the space formed by the non-conductive coating layer limited to a portion protrudes convexly, making it difficult to accommodate all the cores spread in various directions, which has the disadvantage that the metal layer is easily damaged.

Additionally, there is a disadvantage in that only cores with through holes are applied.

In addition, the adhesive strength between the polymer film and the metal layer is not sufficient, so when the metal layer of a short electrical contact terminal is soldered to the circuit board with solder cream, there is a disadvantage that the electrical contact terminal is easily separated from the metal layer by external force. .

The purpose of the present invention is to provide an elastic electrical contact terminal that can minimize cracks in the metal layer by minimizing the effect on the metal layer even when the core is pressed in the vertical direction after the electrical contact terminal is soldered to the circuit board by external force.

Another object of the present invention is to provide an elastic electrical contact terminal that can provide space reliably and economically while maximizing the space where the polymer film of the core and the side wall do not adhere.

Another object of the present invention is to provide an elastic electrical contact terminal that can minimize cracks or deformation of the metal layer when the core is pressed from the outside by reinforcing the elasticity and mechanical strength of the polymer film portion.

Another object of the present invention is to provide an elastic electrical contact terminal that allows the polymer film positioned in response to the space to be well spread outward of the side wall when the core is pressed from the outside.

Another object of the present invention is to provide an elastic electrical contact terminal that has good resilience and the center of gravity of the electrical contact terminal is located at the lower part where the electrical contact terminal is soldered.

Another object of the present invention is to provide an elastic electrical contact terminal in which the edge of the core is difficult to spread upward due to external force.

Another object of the present invention is to provide an elastic electrical contact terminal that can increase soldering strength even when the length of the electrical contact terminal is short.

According to one aspect of the present invention, an elastic core, a heat-resistant polymer film continuously surrounding the core in the longitudinal direction and bonded to the upper and lower surfaces of the core via an elastic adhesive layer, and a metal layer formed on the outer surface of the polymer film. It is composed of, a through hole penetrating along the longitudinal direction is formed inside the core, a surface for vacuum pickup is provided on the upper surface of the core, and the side wall of the core between the upper and lower surfaces of the core is of the core. An elastic electrical contact terminal is provided that is bent toward a central axis in the width direction to form a folded portion, and in which a space is formed between the inner surface of the polymer film and the side wall of the core by the folded portion.

Preferably, the folded portion may be formed symmetrically on both side walls and may be formed in the middle portion of the core in the height direction.

Preferably, a stopper integrally formed with the core may be formed to protrude horizontally from the folded portion.

Preferably, the vertical cross section of the folded portion may be hourglass-shaped or X-shaped.

Preferably, the adhesive layer may be formed on the entire inner surface of the polymer film, but the inner surface of the polymer film is not adhered to the side wall of the core due to the folded portion.

Preferably, the width of the lower surface of the core is greater than the width of the upper surface of the core, the fleshy thickness of the lower wall of the core is thicker than the fleshy thickness of the upper wall of the core, or the volume of the lower wall of the core is greater than the volume of the upper wall of the core. there is.

Preferably, an elastic reinforcing layer made of a polymer integrally formed with the polymer film may be formed to have a uniform thickness between the polymer film and the adhesive layer.

Preferably, when the electrical contact terminal is pressed downward from the upper surface after the soldering, the polymer film may be bent in a direction opposite to the direction in which the folded portion is folded.

Preferably, the polymer film covering the space is kept flat so that the space has a constant size, and the polymer film has a tension that does not cause deformation of the core.

According to another aspect of the present invention, an elastic core, a heat-resistant polymer film that continuously wraps the core in the longitudinal direction and adheres to the upper and lower surfaces of the core via an elastic adhesive layer, and a metal layer formed on the outer surface of the polymer film. It is composed of, the vertical cross-section of the core has a Σ (sigma) shape, a surface for vacuum pickup is provided on the upper surface of the core, and the side wall of the core between the upper and lower surfaces of the core is formed by the shape of the vertical cross-section. An elastic electrical contact terminal is provided, wherein a folded portion is formed, and a space is formed between the inner surface of the polymer film and the side wall of the core by the folded portion.

According to another aspect of the present invention, an elastic core, a heat-resistant polymer film that continuously wraps the core in the longitudinal direction and adheres to the upper and lower surfaces of the core via an elastic adhesive layer, and a metal layer formed on the outer surface of the polymer film. The vertical cross-section of the core is Z-shaped, and a surface for vacuum pickup is provided on the upper surface of the core, and the top of the side wall of the core is between the upper and lower walls of the core due to the shape of the vertical cross-section. An elastic electrical contact terminal is provided, wherein folded portions are formed at and at the bottom, respectively, and a space is formed between the inner surface of the polymer film and the side wall of the core by the folded portion.

Preferably, it further includes a metal clip capable of reflow soldering that is inserted into the lower part of the core and installed in contact with the lower surface of the core, wherein the metal clip includes: a base extending in the longitudinal direction and contacting the lower surface of the core; and a bridge that is bent at both ends of the base and grips the lower wall of the core at both ends in the longitudinal direction.

According to the present invention, after the electrical contact terminal is soldered to the circuit board, when the electrical contact terminal is pressed from top to bottom by an external force, the polymer film located opposite the folded portion reliably spreads toward the outside of the side wall, thereby forming the metal layer. The effect of is small, so deformation or cracking of the metal layer can be minimized.

In addition, the shape of the core makes it easy to maximize the space provided by the side walls of the core and the polymer film, and it is easy to manufacture the space reliably and economically.

In addition, the width of the upper surface of the core is smaller than the width of the lower surface, and the spacing between the polymer films is located on the lower surface of the core, so damage from external forces is reduced.

In addition, by forming an elastic reinforcing layer on the polymer film to ensure elasticity and strength, the metal layer, polymer film, and metal layer are protected from external force, and the polymer film located at the folded portion is easily curved when pressed in the vertical direction.

Additionally, the polymer film covering the folded portion prevents the edges of the core from spreading upward due to external force.

In addition, the center of gravity of the electrical contact terminal is located at the bottom where the electrical contact terminal undergoes reflow soldering, providing reliable surface mounting.

In addition, a metal clip capable of reflow soldering is inserted into the lower part of the core, so soldering strength can be increased even when the length of the electrical contact terminal is short.

Figure 1 shows an elastic electrical contact terminal according to an embodiment of the present invention.
Figure 2 shows the state in which the electrical contact terminal is mounted and pressed.
Figures 3(a) to 3(c) show modified cores with through holes.
Figures 4(a) to 4(c) show elastic electrical contact terminals according to another embodiment.
Figures 5(a) and 5(b) each show the application of a metal clip.

It should be noted that the technical terms used in the present invention are only used to describe specific embodiments and are not intended to limit the present invention. In addition, the technical terms used in the present invention, unless specifically defined in a different sense in the present invention, should be interpreted as meanings generally understood by those skilled in the art in the technical field to which the present invention pertains, and are not overly comprehensive. It should not be construed in a literal or excessively reduced sense.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the attached drawings.

Figure 1 shows an elastic electrical contact terminal according to an embodiment of the present invention, and Figure 2 shows the electrical contact terminal in a mounted and pressed state.

The electrical contact terminal 100 is a tube-shaped elastic core 110 with a longitudinal through hole 111 formed therein, and is bonded to the upper and lower surfaces of the core 110 via an elastic adhesive layer 120. It consists of a heat-resistant polymer film 130 that wraps the 110 in the width direction and is continuous in the longitudinal direction, and a metal layer 140 formed on the outer surface of the polymer film 130, and covers the side wall of the core 110. ) is not adhered to the side wall of the core 110 and forms the space 101.

The core 110 according to this embodiment has a vertical cross-section of approximately an hourglass shape, and has a virtual central axis 2 in the width direction of the core 110 on both side walls corresponding to approximately the middle portion in the height direction of the core 110. A folded portion 112 having a concave shape toward the dot-and-dash line is formed.

Here, the folded portion 112 refers to a portion where both side walls of the core 110 move inward and are folded when the core 110 is pressed from top to bottom.

Preferably, the folded portion 112 is symmetrical on both side walls so that it can uniformly receive force applied downward from the top.

Here, the meaning of 'middle portion' refers to a position roughly corresponding to the middle and does not mean the exact middle in terms of dimensions, and may be preferably formed at a position slightly higher than the middle of the height of the core 110 for mechanical stability. there is.

As described above, a through hole 111 is formed in the longitudinal direction inside the core 110. In this embodiment, the cross-sectional shape of the through hole 111 is hourglass-shaped, similar to the cross-sectional shape of the core 110. is formed by

The distance through which the folded portion 112 moves inward due to the force pressing in the vertical direction from top to bottom is not specified, but when the core 110 is pressed with force from above, the folded portion 112 approaches each other and the through hole 111 is formed. It is enough that they do not touch each other within the interior, but they may touch each other in some parts.

The adhesive layer 120 formed on the inner surface of the portion of the polymer film 130 corresponding to both side walls of the core 110 does not adhere to both side walls of the core 110, thereby forming a space 101.

Referring to Figure 1, the polymer film 130 surrounds the upper and lower surfaces of the core 110 through the adhesive layer 120, and the adhesive layer 120 is adhered to the upper and lower surfaces of the core 110, creating a space ( 101) is structurally and naturally formed by the folded portion 112 of the core 110.

An adhesive layer 120 is formed entirely on the surface of the polymer film 130, and an adhesive layer 120 is also formed on the polymer film 130 located corresponding to the space 101.

The elasticity and mechanical strength of the polymer film 130 located in the space 101 are improved by the adhesive layer 120 having elasticity attached to the polymer film 130 located corresponding to the space 101, so that it can be protected from external forces. There is little damage or deformation of the metal layer 140 and the polymer film 130.

In the present invention, when the polymer film 130 wraps and adheres to the upper and lower surfaces of the core 110 through the adhesive layer 120, both corners of the upper and lower surfaces of the core 110 are also adhered and wrapped, and both edges The part includes short distance sides.

In this way, the side parts included in both corners of the upper and lower surfaces of the core 110 correspond to the fleshy parts of the upper and lower walls of the core 110 and are therefore not included in the side walls of the core 110.

The size of the space 101 may be proportional to the distance that the folded portion 112 of the core 110 is pushed inward.

It is desirable that the space 101 be formed as large as possible to sufficiently accommodate the deformation of the core 110 when the core 110 is pressed from top to bottom.

In this embodiment, the through hole 111 is formed in an hourglass shape by the folded portion 112 so that the core 110 can be easily pressed or pressed with a small force, but the shape is not limited thereto.

For the purpose of the present invention, the shape and dimensions of the folded portion 112 and the through hole 111 may be provided in various ways depending on the range and pressing force of the core 110.

For example, the width of the lower surface of the core 110 is greater than the width of the upper surface of the core 110, the thickness of the lower wall of the core 110 is thicker than the thickness of the upper wall of the core 110, or The volume of the lower wall of 110 is larger than the volume of the upper wall of core 110, so the electrical contact terminal 100 has good resilience and surface mounting can be performed reliably.

In addition, the size and shape of the through hole 111 are such that the core 110 can be easily pressed.

The width of the upper surface of the core 110 may be smaller than the width of the lower surface of the core 110 to reduce movement when surface mounting the electrical contact terminal 100 and to improve soldering strength after soldering, and to facilitate reflow soldering. The polymer film 110 is spaced apart from the central portion of the lower surface of the core 110.

Additionally, when the width of the upper surface of the core 110 is smaller than the width of the lower surface of the core 110, contact of the electrical contact terminal 100 from the outside may be reduced after soldering.

In addition, both edges of the upper and lower surfaces of the core 110 are curved, so damage to the electrical contact terminal 100 due to external force after soldering is minimal.

The electrical contact terminal 100 is vacuum picked up from the metal layer 140 located on the upper surface of the core, and the metal layer 140 on the lower surface is reflow soldered using solder cream.

As is well known, the core 110 and the adhesive layer 120 are silicone rubber with good elasticity, and the polymer film 130 is a material such as polyimide that has heat resistance and flexibility, and all correspond to the soldering temperature.

The core 110 on which the through hole 111 is formed is provided in various shapes by extrusion, and the adhesive layer 120 is provided by curing a liquid silicone adhesive.

In addition, the metal layer 140 formed on the outer surface of the polymer film 130 is formed by sputtering metal on the polymer film 130 and plating copper, or by casting a liquid polymer resin on a copper foil and then curing it, or It can be formed by adhering the copper foil to the polymer film 130 using another adhesive. Preferably, the metal layer 140 may be formed by sequentially plating tin, nickel, and gold on the copper foil.

Although not particularly limited, the thickness of the polymer film 130 may be approximately 5㎛ to 25㎛, the thickness of the adhesive layer 120 may be approximately 10㎛ to 50㎛, and the thickness of the metal layer 140 may be approximately 2㎛ to 20㎛. The dimensions are designed and provided in various ways to suit the characteristics of the electrical contact terminal 100.

Optionally, as shown enlarged in circle B of FIG. 1, an elastic reinforcement layer 150 made of a flexible polymer material may be formed by adhering to the inner surface of the polymer film 130.

Preferably, the elastic reinforcement layer 150 is a silicone rubber layer that has good adhesion to the adhesive layer 120 and has elasticity.

The elastic reinforcement layer 150 is adhered to the core 110 via an adhesive layer 120 on the upper and lower surfaces of the core 110, and is attached to the adhesive layer 120 in the space 101 on both side walls of the core 110. covered by

The portion of the elastic reinforcement layer 150 corresponding to the space 101 on both side walls of the core 110 provides elasticity and mechanical strength to the polymer film 130, thereby strengthening the polymer film 130 and the metal layer 140 located in this area. It protects the core 110 from the top to the bottom, causing the polymer film 130 to spread in the opposite direction of both side walls.

As an example, the thickness of the elastic reinforcement layer 150 may be about 10㎛ to 50㎛, and is formed to a uniform thickness on the polymer film 130 through a casting process.

Referring to FIG. 2, when force is applied from the upper surface to the lower surface of the electrical contact terminal 100 and the core 110 is pressed downward, the folded portions 112 on both side walls move in directions facing each other (dotted arrows in FIG. 2). (represented by) the height of the core 110 is lowered.

In this process, the portion of the polymer film 130 corresponding to the space 101 is preferably spread outward on both sides, as shown by solid arrows in FIG. 2.

At this time, as described above, an adhesive layer 120 is formed on the inner surface of the polymer film 130 at a position corresponding to the space 101, and the elasticity and mechanical strength of the polymer film 130 are improved by the adhesive layer 120. It is easy to reliably expand to the outside of the space 101, and damage to the polymer film 130 or the metal layer 140 due to external forces is minimal.

Referring again to FIG. 1, the polymer film 130 covering the space 101 is maintained flat so that the space 101 has a constant size, and the core 110 is not deformed by the polymer film 130. It has a certain amount of tension.

Figures 3(a) to 3(c) show modified cores with through holes.

Referring to FIG. 3(a), a stopper 115 that limits the movement of the polymer film 130 is formed at the folded portion 112 of the core 110 integrally with the core 110, protrudes to a certain length, and extends in the longitudinal direction. It may be formed to extend in a direction (i.e., into the ground).

As described later, the stopper 115 prevents the metal layer 130 from being damaged by being folded by limiting the depth at which the polymer film 130 is pushed inward rather than spreading outward when the electrical contact terminal 100 is pressed from above, as will be described later. can do.

The stopper 115 is manufactured integrally with the core 110 during the extrusion process. Preferably, the protruding length of the stopper 115 is smaller than the width of the lower surface of the core 110 and larger than the width of the upper surface.

In addition, looking at FIG. 3(b), the through hole 111 of the core 110 has a rectangular shape, and the width of the through hole 111 corresponding to the folded portion 112 is formed to be wider than that of the above embodiment. As a result, there is an advantage that the electrical contact terminal 100 can be folded a lot when pressed, so it can be pressed a lot.

Referring to FIG. 3(c), the vertical cross-section of the core 110 is approximately X-shaped, and a folded portion 112 is formed in the middle portion of both side walls.

According to this embodiment, a single intersection 114 is formed at the portion where the folded portion 112 is formed, and through holes 111 are formed separately at the top and bottom around the intersection 114.

According to this structure, when the core 110 is pressed from above, the intersection portion 114 moves downward and the folded portion 112 is folded on the left and right, so there is an advantage that the operation is performed stably and reliably.

In the three embodiments of FIGS. 3(a) to 3(c), the upper surface of the core 110 is positioned so that the load of the electrical contact terminal 100 is located at the bottom and the electrical contact terminal 100 has less contact with the outside. It is preferable that the width is smaller than the width of the lower surface.

Normally, the polymer film 130 located in the folded portion 112 is pushed out of the space 101 when the core 110 is pressed from above, but in rare cases, it may be pushed into the space 101, and the present invention covers all of these. It can be included.

When pushed into the space 101, the radius of curvature at which the polymer film 130 is folded is smaller compared to when pushed into the space 101, so more force is applied to the metal layer 140, so there is a high possibility that the metal layer 140 will be damaged. (101) When pushed outward, the polymer film 130 has a large bending radius of curvature, so less force is applied to the metal layer 140, thereby reducing the possibility of damage to the metal layer 140.

Accordingly, when the width of the upper surface of the core 110 is smaller than the width of the lower surface, the possibility of the polymer film 130 being pushed into the space 101 is reduced, thereby reducing the possibility of the metal layer 140 being damaged by being folded.

The electrical contact terminal 100 of this embodiment is placed by pressing the lower surface of the metal layer 140 onto the solder cream on the conductive pattern 20 formed on the circuit board 10 by vacuum pickup from the upper surface of the metal layer 140 and reflowed. In soldering, as is well known, liquid molten solder cream is cooled between the lower surface of the metal layer 140 and the conductive pattern 20 to form a solid solder layer 30 and is mounted on the circuit board 10.

When the electrical contact terminal 100 soldered in this way is pressed vertically from top to bottom, the change in the cross-sectional shape of the polymer film 120 due to the space 101 does not follow the change in the cross-sectional shape of the core 110, so it is pressed. There is an advantage in that damage or cracks to the metal layer 140 due to damage can be minimized.

Figures 4(a) to 4(c) show elastic electrical contact terminals according to another embodiment.

Referring to FIG. 4(a), the vertical cross-section of the core 110 forms a Σ (sigma) shape, and a folded portion 112 is formed in the middle of one side wall.

According to this embodiment, when the core 110 is pressed from above, the folded portion 112 can go deeper inward compared to the embodiment of FIG. 1, thereby increasing the distance at which the core 110 is pressed.

The electrical contact terminal 100 of this shape has the advantage of reducing the overall pressing force.

Referring to FIG. 4(b), the vertical cross-section of the core 110 has a Z-shape, so that the upper and lower walls and the inclined side walls connecting the upper and lower walls are formed integrally, and folded portions are formed at the top and bottom of the inclined side walls, respectively. (112, 113) are formed.

According to this embodiment, when the core 110 is pressed from top to bottom, the folded portion 113 mounted and fixed on the circuit board is folded as is, while the folded portion 112 on the upper right side is pushed while being pressed and the polymer film 130 ) may flare outward.

In this embodiment, the thickness of the lower wall of the core 110 is preferably formed to be partially thicker than the thickness of the upper wall, thereby improving the restoring force and maintaining a stable posture during soldering. As described later, a metal clip is applied. In this case, the metal clip ensures stable grip.

FIG. 4(c) is a modified example of FIG. 4(b), in which the end of the upper surface of the core 110 is bent and extended downward to form a bent portion 116, and the end of the lower surface is bent and extended upward to form a bent portion 117. ) to form.

According to this structure, the electrical contact terminal 100 has the advantage that it is no longer pressed by the bent portions 116 and 117 when pressed downward from the top.

In addition, since the polymer film 130 also adheres to the bent portions 116 and 117 via the adhesive layer 120, the polymer film 130 and the metal layer 140 formed at a position corresponding to the space 101 are more stable. You can.

Each embodiment of FIG. 4 commonly forms folded portions 112 and 113 in which at least one side wall of the core 110 is pressed, and the inner surface of the polymer film 130 and the core ( A space 101 is formed between the side walls of 110).

Preferably, when the electrical contact terminal 100 is pressed, the polymer film 130 preferably opens to the outside of the space 101.

In addition, as shown in FIG. 4(c), the width of the upper surface of the core 110 is smaller than the width of the lower surface of the core 110 to reduce movement when surface mounting the electrical contact terminal 100 and to improve soldering strength after soldering. It can be small.

Since both side walls and corners of the core 110 are covered by the polymer film 130, there is an advantage in preventing the corners of the core 110 from being lifted by external forces.

In each embodiment of Figure 4, as described above, the core 110 is made of silicone rubber with good elasticity, but is not limited to this and may be made of a metal material such as copper alloy or stainless steel with high mechanical strength.

When applying a metal material, it has greater mechanical strength than silicone rubber, so it is easy to make it thin.

Preferably, the metal material is a spring metal material with high strength and good elasticity.

Figures 5(a) and 5(b) each show the application of a solderable metal clip 200.

In this embodiment, the core 110 to which the metal clip 200 is applied is given as an example in a Z-shape, but the same can be applied to other embodiments described above.

The metal clip 200 is installed in the lower part of the core 110 in close contact with the lower surface of the core 110. A base 210 extending in the longitudinal direction and contacting the lower surface of the core 110, and the base 210 It consists of bridges 220 and 222 that are bent at both ends and hold the lower wall of the core 110 at both ends in the longitudinal direction.

According to this structure, the metal clip 200 prevents soldering to the metal layer 140, thereby preventing damage to the metal layer 140 when repeatedly pressed, and the soldering strength improves due to the metal clip 200.

In addition, there is an advantage that soldering strength can be increased by the metal clip 200 even when the length of the electrical contact terminal is short.

For other modified examples of the metal clip applied to the electrical contact terminal of the present invention, refer to Korean Patent No. 2340421 applied and registered by the present applicant.

Due to the structure or shape described above, the electrical contact terminal of the present invention has the advantage of being able to be pressed with less force and more pressure, and has the advantage that the metal layer is less deformed or cracked when pressed a lot or repeatedly.

In addition, there is an advantage that it is easy to manufacture electrical contact terminals in various shapes and can be reflow soldered reliably.

Although the above description focuses on embodiments of the present invention, it goes without saying that various changes can be made at the level of those skilled in the art. Accordingly, the scope of the present invention cannot be construed as limited to the above-described embodiments, and should be interpreted in accordance with the claims set forth below.

10: circuit board
20: Challenge pattern
30: solder layer
100: Electrical contact terminal
101: space
110: core
111: Through hole
112: folded part
120: Adhesive layer
130: Heat-resistant polymer film
140: metal layer
150: Elastic reinforcement layer

Claims (15)

It is composed of an elastic core, a heat-resistant polymer film that continuously surrounds the core in the longitudinal direction and is bonded to the upper and lower surfaces of the core through an elastic adhesive layer, and a metal layer formed on the outer surface of the polymer film,
A through hole penetrating along the longitudinal direction is formed inside the core, and a surface for vacuum pickup is provided on the upper surface of the core,
The side wall of the core between the upper and lower surfaces of the core is bent toward the central axis in the width direction of the core to form a folded portion,
An elastic electrical contact terminal in which a space is formed between the inner surface of the polymer film and the side wall of the core by the folded portion, so that the inner surface of the polymer film is not adhered to the side wall of the core. In claim 1,
The folded portion is an elastic electrical contact terminal formed symmetrically on both side walls. In claim 1,
The folded portion is an elastic electrical contact terminal formed in the middle portion of the core in the height direction. In claim 1,
An elastic electrical contact terminal in which a stopper integrally formed with the core is formed to protrude horizontally from the folded portion. In claim 1,
The vertical cross section of the folded portion is an elastic electrical contact terminal having an hourglass shape or an X shape. In claim 1,
An elastic electrical contact terminal in which the adhesive layer is formed on the entire inner surface of the polymer film. delete In claim 1,
An elastic electrical contact terminal in which an elastic reinforcing layer made of a polymer material and integrally formed with the polymer film is formed between the polymer film and the adhesive layer to a uniform thickness. In claim 1,
An elastic electrical contact terminal wherein when the electrical contact terminal is pressed downward from the upper surface after being soldered, the polymer film opens in a direction opposite to the direction in which the folded portion is folded. In claim 1,
The polymer film covering the space is maintained flat so that the space has a constant size, and the elastic electrical contact terminal has tension such that the core is not deformed by the polymer film. In claim 1,
The width of the lower surface of the core is greater than the width of the upper surface of the core, or
The thickness of the lower wall of the core is thicker than the thickness of the upper wall of the core, or
An elastic electrical contact terminal in which the volume of the lower wall of the core is larger than the volume of the upper wall of the core. In claim 1,
It further includes a metal clip capable of reflow soldering that is inserted into the lower part of the core and installed in contact with the lower surface of the core,
The metal clip is,
a base extending in the longitudinal direction and contacting the lower surface of the core; and
An elastic electrical contact terminal composed of a bridge that is bent at both ends of the base and grips the lower wall of the core at both ends in the longitudinal direction. It consists of an elastic core, a heat-resistant polymer film that continuously surrounds the core in the longitudinal direction and is bonded to the upper and lower surfaces of the core through an elastic adhesive layer, and a metal layer formed on the outer surface of the polymer film,
The vertical cross section of the core has a Σ (sigma) shape,
A surface for vacuum pickup is provided on the upper surface of the core,
A folded portion is formed on the side wall of the core between the upper and lower surfaces of the core due to the shape of the vertical cross-section,
An elastic electrical contact terminal in which a space is formed between the inner surface of the polymer film and the side wall of the core by the folded portion and is capable of reflow soldering by surface mounting. It consists of an elastic core, a heat-resistant polymer film that continuously surrounds the core in the longitudinal direction and is bonded to the upper and lower surfaces of the core via an elastic adhesive layer, and a metal layer formed on the outer surface of the polymer film,
The vertical cross section of the core is Z-shaped,
A surface for vacuum pickup is provided on the upper surface of the core,
By the shape of the vertical cross-section, folded portions are formed at the top and bottom of the side walls of the core, respectively, between the upper and lower walls of the core,
An elastic electrical contact terminal in which a space is formed between the inner surface of the polymer film and the side wall of the core by the folded portion and is capable of reflow soldering by surface mounting. It consists of an elastic core, a heat-resistant polymer film that continuously surrounds the core in the longitudinal direction and is bonded to the upper and lower surfaces of the core through an elastic adhesive layer, and a metal layer formed on the outer surface of the polymer film,
The vertical cross-section of the core has an hourglass shape,
A surface for vacuum pickup is provided on the upper surface of the core,
A folded portion is formed on the side wall of the core between the upper and lower surfaces of the core due to the shape of the vertical cross-section,
An elastic electrical contact terminal in which a space is formed between the inner surface of the polymer film and the side wall of the core by the folded portion and is capable of reflow soldering by surface mounting.

Images