KR102594639B1 - Clip gasket preventing stress concentration - Google Patents

Abstract

Disclosed is a gasket that can prevent stress applied to the gasket by external force from concentrating on one point. The gasket includes a single-body support made of metal, and the support includes a fixing part, an extension part bent upward from a longitudinal end of the fixing part, and an end of the extension part bent to the inside of the through hole. It consists of a fitting part that is fitted, and the fitting part is spaced apart from the bottom of the through hole at a regular interval, and the bent fitting part grasps the core to prevent the core from being separated by an external force, and the spaced apart part is spaced apart from the bottom of the through hole. When the core receives an external force, the core moves in the width direction or rotates around the support and flows.

Description

Clip gasket preventing stress concentration}

The present invention relates to a clip gasket, and particularly to a clip gasket that can prevent stress applied to the gasket by external force from concentrating on one point.

Electromagnetic waves generated from circuits of electronic devices are radiated to the outside through the atmosphere or conducted through wires.

To prevent problems caused by electromagnetic waves or to ground the circuit board, electrically conductive gaskets with solderable elasticity are used, and some of these electrically conductive gaskets are reflow soldered and mounted on the circuit board by surface mounting using vacuum pickup. do.

For example, the electrically conductive gasket of Domestic Patent No. 2340421 applied for and registered by the present applicant is a clip gasket having a support made of a single body made of metal, and the support supporting the core is It consists of an extension part bent upward at both ends in the longitudinal direction of the top and the fixing part, and a first fitting part and a second fitting part bent towards each other at the top of the extension part, and the first and second fitting parts are through holes in the core. It has a structure that is sandwiched between both ends and overlaps each other.

In the gasket of the above patent, the core is firmly fixed by the support by providing a structure in which the first and second fitting parts are inserted into both ends of the through hole of the core and overlap each other. In this structure, the external force applied by the object from the top of the gasket When the core is pressed and deformed, stress is concentrated at a specific point on the core.

For example, if the fitting part firmly fixes the bottom of the through hole, the resulting stress from an externally applied force is concentrated on the bottom of the through hole or its surroundings, causing the through hole to widen or narrow.

As a result, cracks are likely to occur in the thin metal layer surrounding the core in the area where stress is concentrated, which can increase the electrical resistance leading up and down the opposing object or cut off the electrical flow.

Therefore, the purpose of the present invention is to provide a clip gasket that can minimize stress concentration on the core due to external force while preventing the electrical contact terminal from being easily separated from the support after soldering.

Another object of the present invention is to provide a clip gasket where the compressive force repeatedly applied to the gasket after soldering is not concentrated on a certain portion of the metal layer of the electrical contact terminal, resulting in less destruction or damage to the metal layer in one portion.

Another object of the present invention is to provide a clip gasket that can stably press an object even if the upper surface of the electrical contact terminal is not horizontal or the gasket is soldered at an angle to the circuit board.

According to one aspect of the present invention, a clip gasket is sandwiched between opposing objects in a vertical direction and can be soldered by surface mounting to electrically connect the objects, wherein the gasket is a support made of metal made of a single body. It consists of an electrical contact terminal having elasticity capable of vacuum pickup, which is laminated on the upper part of the support and a part of the support is inserted and coupled, and the electrical contact terminal has elasticity with a through hole extending in the longitudinal direction formed therein. It consists of a core, a polymer film that covers and adheres to the outer surface of the core via an adhesive, and a metal layer formed on the outer surface of the polymer film, and the support member includes a fixing part and an extension bent upward from a longitudinal end of the fixing part. It consists of a portion and a fitting portion bent and fitted inside the through hole at an end of the extension portion, the fitting portion being physically spaced from at least a portion of the bottom or side wall of the through hole, and after the lower portion of the fixing portion is soldered. A clip gasket capable of soldering by surface mounting, characterized in that when the object presses the electrical contact terminal, the electrical contact terminal moves relative to the support due to the separation and the stress due to the pressing force is distributed to the metal layer. This is provided.

According to another aspect of the present invention, there is a clip gasket that is pressed in the vertical direction between opposing objects and can be soldered by surface mounting to electrically connect the objects, wherein the gasket is a support made of metal made of a single body. It is composed of an elastic electrical contact terminal that is laminated on the upper part of the support and is connected by inserting a part of the support, wherein the electrical contact terminal has an elastic core with a through hole extending in the longitudinal direction formed therein, and an adhesive is interposed. It consists of a polymer film that surrounds and adheres the core, and a metal layer formed on the outer surface of the polymer film, and the support includes a fixing part, an extension part bent upward from a longitudinal end of the fixing part, and an end of the extension part. It consists of a fitting part bent and fitted inside the through hole, and the fitting part is spaced apart from both side walls of the through hole of the core at a regular interval, and after the soldering, the electrical contact is made by an external force applied to the electrical contact terminal. At the same time as preventing the terminal from being separated from the support, when the object presses the electrical contact terminal after the lower surface of the support is soldered due to the separation, the electrical contact terminal moves in the width direction or the insertion portion of the support is A clip gasket capable of soldering by surface mounting is provided, which rotates about a central axis to minimize concentration of stress due to the pressing force on a specific part of the metal layer, thereby minimizing cracks in the metal layer.

According to another aspect of the present invention, there is a clip gasket that is sandwiched between opposing objects and can be soldered by surface mounting to electrically connect the objects, wherein the gasket includes a support made of a single body made of metal, and an upper part of the support. It consists of an elastic electrical contact terminal that is stacked and bonded to the electrical contact terminal, wherein the electrical contact terminal includes an elastic core having a longitudinally extending through hole formed therein, a polymer film that covers and adheres to the outer surface of the core through an adhesive, and a metal layer formed on the outer surface of the polymer film, wherein the support includes a fixing part, an extension part bent upward from a longitudinal end of the fixing part, and an end part of the extension part bent toward the inside of the through hole and fitted. It consists of a fitting part, and both ends of the metal layer in the width direction are separated with a gap, each of the separated metal layers is in contact with the fixing part, and the fitting part is physically spaced from the bottom or side wall of the through hole, and the fixing part is physically spaced apart from the bottom or side wall of the through hole. After the lower part of the top is soldered, when the object presses the electrical contact terminal, the electrical contact terminal moves with respect to the support due to the separation, and the stress due to the pressing force is distributed to the metal layer, and even after the movement, the electrical contact terminal moves with respect to the support. A clip gasket capable of soldering by surface mounting is provided, wherein the separated metal layer maintains contact with the fixing part.

Preferably, when the electrical contact terminal is pressed by the object, the electrical contact terminal may move with respect to the support or by rotating the fitting portion about a central axis.

Preferably, when the electrical contact terminal is pressed by the object, the stress can be spread rather than concentrated in one place due to the movement.

Preferably, the fixing part may be formed with first and second protection parts bent upward from an end in the width direction of the fixing part.

Preferably, the maximum width of both side walls of the electrical contact terminal in the height direction of the electrical contact terminal may be greater than the maximum width of the lower end of the electrical contact terminal that contacts the upper surface of the fixing part.

Preferably, both ends of the metal layer in the width direction are separated with a gap, and each of the separated metal layers can be in contact with the fixing part.

According to the present invention, since the fitting part does not tightly grasp the core due to the spacing, the core can flow even if an external force is applied to the electrical contact terminal from the top by an object after soldering, thereby minimizing stress concentration at a specific point. You can.

As a result, the electrical contact terminal can move by flow such as rotation or movement on the support, so the stress is distributed rather than concentrated in any part of the metal layer, minimizing damage to the metal layer in one part.

In addition, even if the top surface of the electrical contact terminal is not horizontal or the gasket is soldered at a slight angle to the circuit board, the gasket can be pressed flat and stably because the gasket itself flows when an object presses on the gasket at the top.

1 is an exploded perspective view showing a clip gasket according to an embodiment of the present invention.
Figures 2(a) to 2(c) are a combined perspective view and a vertical cutaway view, respectively.
Figure 3 shows another structure of the support.
Figures 4(a) and 4(b) respectively show states before and after an external force is applied by an object.
Figure 5 shows a modified example of the support.
Figure 6 shows a clip gasket according to another embodiment of the present invention.

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 is an exploded perspective view showing a clip gasket according to an embodiment of the present invention, and Figures 2(a) to 2(c) are a combined perspective view and a vertical cutaway view, respectively.

The clip gasket of the present invention is inserted so as to be pressed vertically between opposing objects and functions to electrically connect the objects to each other.

The clip gasket 10 is composed of a single-body metal support 100 and an elastic electrical contact terminal 200 movably coupled to the support 100 on the support 100.

The clip gasket 10 is reel taped and vacuum picked up from the upper surface of the electrical contact terminal 200, and the lower surface of the support 100 is reflow soldered in contact with the solder cream formed on the circuit board.

Accordingly, at least the surface of the electrical contact terminal 200 has a vacuum pickup portion and meets the soldering temperature, and as representatively shown in FIG. 1, the length may be shorter than the width and the height may be relatively large, but is not limited thereto. .

Preferably, the shape of the solder cream or the material or shape of the support 100 can be appropriately designed so that the solder cream does not contact the electrical contact terminal 200 during reflow soldering.

The electrical contact terminal 200 includes an elastic core 210 having a certain volume, a polymer film 220 that surrounds and adheres the core 210 via an adhesive, and a metal layer 230 formed on the outer surface of the polymer film 220. ), and all components have heat resistance corresponding to the soldering temperature.

Preferably, the metal layer 230 is made of a material that can be soldered with solder cream, and may be a material in which tin, silver, or gold is plated on a copper layer, but is not limited thereto.

A through hole 212 extending in the longitudinal direction is formed inside the core 210. The cross-sectional shape of the through hole 212 is varied by extruding silicone rubber gum corresponding to the core 210. Since it is manufactured by continuously extruding and curing, it can be easily provided.

As in this embodiment, the lower surface of the core 210 is flat, but it can be roughly flat by considering tolerances when manufacturing the core, and of course, a shape with a concave center portion is also possible.

The size of the support 100 is not particularly limited, but the area of the lower surface of the support 100 is preferably equal to or larger than the area of the lower surface of the electrical contact terminal 200 for good soldering strength and easy reflow soldering.

The support 100 preferably has high strength so that the bent portion does not easily spread upward, and is made of inexpensive stainless steel or copper alloy such as phosphor bronze, iron alloy, etc., and has a thickness of 0.08 mm to 0.2 mm, and is made of electrical contact. The shape, size, and thickness of the support 100 may vary depending on the size and shape of the terminal 200.

A plating layer may be formed on the outer surface of the support 100 by plating to facilitate soldering with solder cream, and tin, nickel-tin, or silver may be applied.

The support 100 can be manufactured by pressing and bending a metal foil having a certain width on which a plating layer is formed. If the support 100 is stainless steel, the plating layer is not formed on the pressed cut surface, so the molten solder does not rise through the cut surface. No.

In this embodiment, the support 100 includes a fixing part 110, an extension part 120 bent upward at both longitudinal ends of the fixing part 110, and a core (120) bent inward at the end of the extension part 120. It consists of a fitting portion 130 inserted into the through hole 212 of 210).

The fitting portion 130 has first and second fitting portions 131 and 132 formed corresponding to both ends of the fixing portion 110, and may preferably be formed to overlap each other. For example, looking at Figure 1, a certain portion of the end of the first fitting part 131 is located below the second fitting part 132 and is configured to overlap.

According to this structure, the end of the first fitting part 131 of the support 100 goes under the second fitting part 132 and overlaps each other, thereby minimizing the opening of the fitting part 130.

Figure 3 shows another structure of the support.

As shown in Figure 3, the first and second fitting portions 131 and 132 overlap each other, and the first and second fitting portions 131 and 132 are tilted downward to further reduce the phenomenon of the fitting portion being stretched or widened. It is possible to minimize the electrical contact terminal 200 from being easily removed or separated from the support 100.

According to the present invention, as shown enlarged in the circle of FIG. 2(b), the first and second fitting parts 131 and 132 are spaced apart from the bottom of the through hole 212 of the core 210 at a constant distance t1. .

As a result, the first and second fitting parts 131 and 132 of the support 130 grip the core 210 from both ends of the through hole 212 to prevent the core 210 from being easily separated by external force. At the same time, when the core 210 is pressed from above by an object, the core 210 can move in the width direction or rotate around the fitting portion 130 of the support 130 as a central axis.

As a result, when the electrical contact terminal 200 is pressed, the electrical contact terminal 200 can spread more flexibly due to movements such as movement or rotation.

Additionally, optionally, the first and second fitting portions 131 and 132 may be spaced apart from both side walls of the through hole 212 of the core 210 at a constant distance t2.

If necessary, the first and second fitting portions 131 and 132 may be spaced apart from the bottom of the through hole 212 of the core 210 at a constant distance t1 and at the same time from both side walls at a constant distance t2.

According to this structure, the electrical contact terminal 200 is basically prevented from being separated from the support 100 due to external force applied to the electrical contact terminal 200 during or after surface mounting.

In addition, the fitting portion 130 of the support 100 is spaced apart from the bottom or side wall of the through hole 212, so that the lower surface of the support 100 is soldered and when an object presses the electrical contact terminal 200, the electrical contact terminal (200) moves in the width direction or rotates around the fitting portion 130 of the support 100 to minimize the stress caused by the pressing force from being concentrated on a specific part of the metal layer 230, and as a result, the metal layer 230 cracks can be minimized.

The length of the first and second fitting portions 131 and 132 is not specifically determined, but may be about 60% to 90% of the length of the through hole 212.

In this embodiment, the area of the fixing part 110 is formed to be larger than the area of the lower surface of the electrical contact terminal 200, but the width of part of the extension part 120 and the fitting part 130 is narrowed, so that the core 210 It is inserted into the through hole 212 of , and this is a natural result because the width of the through hole 212 of the electrical contact terminal 200 cannot be larger than the width of the lower surface of the electrical contact terminal 200.

The extension part 120 is bent at 90 degrees from the fixing part 110 and contacts both end surfaces of the electrical contact terminal 200, and the fitting part 130 is bent horizontally from the extension part 120, thereby forming an electrical contact terminal. (200) can minimize the flow in the longitudinal direction.

Figures 4(a) and 4(b) respectively show states before and after an external force is applied by an object.

Referring to Figure 4 (a), when the object 10 does not press the electrical contact terminal 200, the first and second fitting parts 131 and 132 of the support 130 are through holes ( 212) and are spaced apart from both sides at a certain distance t.

Referring to Figure 4(b), when the object 10 descends and presses the electrical contact terminal 200, the electrical contact terminal 200 has no choice but to spread to the left and right while being pressed.

In this embodiment, as shown in FIG. 2(c), the first and second fitting parts 131 and 132 of the support 130 are spaced apart from the side of the through hole 212 of the core 210 at a constant distance t2. There is, the electrical contact terminal 200 rotates counterclockwise (indicated by an arrow) around the support 130 due to the pressure of the object 10, so that the first and second fitting portions 131 and 132 are connected to the core. They are spaced apart from both sides of the through hole 212 of (210) at t21 and t22, respectively (t21 < t2 < t22).

When the electrical contact terminal 200 rotates around the support 130, for example, the force pressing the object 10 is not balanced left and right, or the force is not applied uniformly overall due to the physical properties of the electrical contact terminal 200 itself. This may be the case.

As a result, compared to the case where the electrical contact terminal 200 is completely fixed by the support 130, concentration of stress at a specific point when the electrical contact terminal 200 receives an external force can be minimized, and the concentration of stress at that point can be minimized. Since stress is not concentrated on the metal layer 230 of the electrical contact terminal 200, destruction or damage to the metal layer 230 can be minimized.

Accordingly, the electrical contact terminal 200 can smoothly connect electricity between the circuit board and the conductive object.

Meanwhile, the upper surface of the electrical contact terminal 200 combined with the support 100 may not be horizontal due to problems in the joining process, and may be soldered at an angle when mounting the gasket on the circuit board.

In this state, when an object presses the gasket from the top, the object usually forms a flat surface, so the electrical contact terminal 200 flows by the flat contact surface of the object and ultimately can be stably pressed to form a flat surface.

Figure 5 shows a modified example of the support.

According to this example, first and second protection parts 151 and 152 bent upward are formed at both ends of the fixing part 110 in the width direction.

As the molten solder rises on the outer surface of the first and second protective parts 151 and 152 during the reflow soldering process, the soldering strength increases, and at the same time, the molten solder adheres to the outer surface of the metal layer 230 of the electrical contact terminal 200. It can definitely prevent sticking.

Figure 6 shows a clip gasket according to another embodiment of the present invention.

The lower surface of the electrical contact terminal 200 is formed in a concave cross-sectional shape from both ends toward the middle, and in particular, the portion in contact with the fixing portion 110 of the support 100, that is, the lowest portion of the electrical contact terminal 200. When the electrical contact terminal 200 is pressed by an object, it is shifted inward from the point indicated by the one-dot chain line and gathered at the fixing part 110 of the support 100, so that it is strongly attached to the fixing part 110 of the support 100. The reliability of electrical connections can be improved by contact.

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. Therefore, 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.

100: support
110: fixing part
120: extension part
130: Fitting part
200: Electrical contact terminal

Claims (11)

A clip gasket that is pressed upward and downward between opposing objects and can be soldered by surface mounting to electrically connect the objects,
The gasket consists of a support made of a single body made of metal, an electrical contact terminal having elasticity capable of vacuum pickup, which is laminated on the top of the support and a part of the support is inserted and coupled,
The electrical contact terminal is composed of an elastic core with a longitudinally extending through hole formed therein, a polymer film that covers and adheres to the outer surface of the core via an adhesive, and a metal layer formed on the outer surface of the polymer film. ,
The support includes a fixing part, an extension part bent upward from a longitudinal end of the fixing part, and a fitting part bent and fitted inside the through hole at an end of the extension part,
The fitting part is physically spaced from at least one of the bottom or side wall of the through hole, and after the lower surface of the fixing part is soldered to one object, when another object presses the electrical contact terminal, the electrical contact is made by the separation. A clip gasket capable of soldering by surface mounting, characterized in that the terminal moves relative to the support and the stress caused by the pressing force is distributed to the metal layer. In claim 1,
A clip gasket, characterized in that when the electrical contact terminal is pressed, the electrical contact terminal moves relative to the support or rotates the insertion portion about a central axis. In claim 1,
A clip gasket, characterized in that when the electrical contact terminal is pressed, the stress is not concentrated in one place but spreads due to the movement. In claim 1,
The fitting part consists of first and second fitting parts corresponding to both ends of the fixing part,
A clip gasket, characterized in that the first and second fitting portions are stacked to overlap each other. In claim 1,
A clip gasket, characterized in that the fixing part is formed with first and second protection parts bent upward from the width direction end of the fixing part. In claim 1,
A clip gasket, characterized in that the separation is formed by a difference in the shape and size of the fitting portion with respect to the shape and size of the through hole. In claim 1,
A clip gasket, characterized in that the maximum width of both side walls of the electrical contact terminal in the height direction of the electrical contact terminal is greater than the maximum width of the lower end of the electrical contact terminal in contact with the upper surface of the fixing part. In claim 1,
A clip gasket, characterized in that both ends of the metal layer in the width direction are separated with a gap, and each of the separated metal layers is in contact with the fixing part. In claim 1,
A clip gasket, characterized in that the vertical direction is vertical. delete A clip gasket that is sandwiched between opposing objects and can be soldered by surface mounting to electrically connect the objects,
The gasket consists of a support made of a single body made of metal, and an elastic electrical contact terminal that is laminated and coupled to the upper part of the support,
The electrical contact terminal is composed of an elastic core with a longitudinally extending through hole formed therein, a polymer film that covers and adheres to the outer surface of the core via an adhesive, and a metal layer formed on the outer surface of the polymer film. ,
The support includes a fixing part, an extension part bent upward from a longitudinal end of the fixing part, and a fitting part bent and fitted inside the through hole at an end of the extension part,
Both ends of the metal layer in the width direction are separated with a gap, and each of the separated metal layers is in contact with the fixing part,
The fitting part is physically spaced apart from the bottom or side wall of the through hole, so that when the lower surface of the fixing part is soldered to one object and another object presses the electric contact terminal, the electric contact terminal is connected to the support by the separation. The stress caused by the pressing force is distributed to the metal layer,
A clip gasket capable of soldering by surface mounting, characterized in that the separated metal layer maintains contact with the fixing part even after the movement.

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