Flexible electrical contact terminals

Abstract

The present invention discloses an elastic electrical contact terminal that can realize reliable electrical connection between objects. The electrical contact terminal comprises: an elastic core; a silicone adhesive coated on the outer surface of the elastic core; and a conductive fiber sandwiched with the silicone adhesive and wound and bonded to the elastic core, wherein the sheet forms a polymer coating on the inner surface opposite to the silicone adhesive and forms a metal layer on the outer surface.

Description

Technical Field

[0001] The present invention relates to an elastic electrical contact terminal, and in particular to an elastic electrical contact terminal which has elasticity between objects, realizes reliable electrical connection, and has low electrical contact resistance with the opposite object. Background Art

[0002] Generally, the elastic electrical contact terminal should have excellent electrical conductivity and elasticity, and be fixed on the printed circuit board by welding or a double-sided conductive pressure sensitive adhesive.

[0003] Figure 1 An example of a conventional electric contact terminal is shown.

[0004] A conductive sheet 30 coated with a hot melt adhesive 20 such as a thermoplastic polymer adhesive such as polyurethane or acrylic is wound around the insulating polyurethane sponge 10 and bonded by heat, and then a double-sided conductive pressure-sensitive tape 40 is attached to the bottom surface of the conductive fiber.

[0005] Among them, as described in the authorized utility model No. 217600 of the present applicant, the conductive sheet is usually electrolessly plated with copper on polyester fiber (PET) or nylon woven or non-woven fabric, and then plated with nickel or gold for the purpose of corrosion protection, thereby forming a metal layer.

[0006] According to such existing electrical contact terminals, when the conductive sheet is thin, in particular, Figure 1 As shown in the circle in FIG. 1 , when the fiber 32 is woven to form the sheet 30 , the hot melt adhesive 20 melted by heat and in a liquid state is squeezed onto the fiber 32 through the gaps 33 formed when the fiber 32 is woven, and can be cured in a protruding state.

[0007] Since hot melt adhesives are generally electrically insulating, if the hot melt adhesive protrudes relatively high from the outer surface of the conductive sheet and the protruding portion contacts a conductive object, the electrical resistance between the object and the conductive sheet will eventually increase, resulting in an inability to reliably achieve electrical connection between the objects through the electrical contact terminals.

[0008] If the hot melt adhesive is conductive, it has disadvantages of being expensive and having a resistance much higher than that of a conductive sheet.

[0009] Furthermore, such hot melt adhesives are generally composed of thermoplastic polymers such as polyurethane, and will melt again when heated, so that it is difficult to maintain adhesion at higher temperatures (assuming that it is 105° C. or higher) and is difficult to use at such temperatures.

[0010] Furthermore, since only polyurethane sponge is used as the elastic body, there is a disadvantage that it is difficult to provide electrical contact terminals having various shapes in an economical manner. Summary of the invention

[0011] Technical issues

[0012] Therefore, an object of the present invention is to provide a resilient electrical contact terminal that is easy to use at high temperatures and has stretchability and flexibility in multiple directions.

[0013] Another object of the present invention is to provide a resilient electrical contact terminal having improved elastic restoring force at high temperatures.

[0014] Another object of the present invention is to provide an elastic electrical contact terminal that minimizes electrical contact resistance by allowing a conductive sheet to directly electrically contact a conductive object by virtue of elasticity.

[0015] Another object of the present invention is to provide an elastic electrical contact terminal that can easily minimize the amount of adhesive and the compressive force between the terminal and an opposing object.

[0016] Another object of the present invention is to provide an elastic electrical contact terminal which has advantages in terms of small pressing force, good elastic restoring force and high height.

[0017] Another object of the present invention is to provide a resilient electrical contact terminal that can be easily and economically provided in a variety of shapes.

[0018] Technical Solution

[0019] The above-mentioned purpose is achieved by the following elastic electrical contact terminal, which is an elastic electrical contact terminal placed between opposing objects to electrically connect the opposing objects, characterized in that it includes: an elastic core; a silicone adhesive coated on the outer surface of the core; and a conductive sheet, which is sandwiched with the adhesive and wrapped and bonded to the core, wherein the sheet is formed by plating metal on woven fibers, a polymer coating is formed on the inner surface of the sheet opposite to the adhesive and bonded to the adhesive, and the outer surface of the sheet is in direct electrical contact with the opposing objects.

[0020] Preferably, the core may be a foam body having a quadrilateral end surface, a separation layer is formed on a pair of surfaces corresponding to each other, and both side end surfaces along the length direction exposed to the outside may be an open-cell structure.

[0021] Preferably, the core may further include: a non-foamed elastomer, laminated with an adhesive sandwiched under the foam, the height of the foam may be greater than the height of the elastomer, and the hardness and compression force of the foam may be less than the hardness and compression force of the elastomer.

[0022] Preferably, the core may be a silicone tube.

[0023] Preferably, the adhesive may be formed by thinly coating liquid silicone corresponding to the adhesive and then hardening it.

[0024] Preferably, the polymer coating may be formed by thinly coating a liquid polymer coating liquid opposite to the polymer coating and then hardening it, and the polymer coating may not be in direct contact with the object due to the polymer coating liquid being exposed through the gaps between the woven fibers.

[0025] Preferably, the electrical contact terminal may include: a double-sided conductive pressure-sensitive adhesive tape bonded to cover the outer surface of the sheet bonded to the lower surface of the core in a spaced manner.

[0026] Technical Effects

[0027] According to the present invention, a silicone adhesive that will not melt again at high temperatures is applied to a braided conductive sheet having stretchability and flexibility in multiple directions, so that the elastic electrical contact terminal can be used at high temperatures and has stretchability and flexibility in multiple directions.

[0028] Furthermore, by using the silicone adhesive having good elastic recovery force at room temperature or high temperature, the elastic recovery rate at room temperature is improved, and the elastic recovery force at high temperature is maintained.

[0029] Furthermore, since the liquid silicone adhesive is not squeezed out to the outer surface of the conductive sheet due to the polymer coating, the conductive fibers are in direct electrical contact with the conductive object, thereby minimizing the electrical contact resistance.

[0030] Furthermore, by using a foam having an open-cell structure having a skin layer on the surface in contact with the adhesive as the elastic core, or using a composite body of a foam and a non-foamed elastic body laminated together, the amount of adhesive and the compressive force can be easily minimized.

[0031] Furthermore, a silicone tube having a smooth surface and through holes formed along the length direction is used as the elastic core, so that the amount of adhesive can be minimized, it can be easily used at high temperatures, and it can be easily provided in various shapes under the premise of being economical. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a diagram showing an example of a conventional electrical contact terminal.

[0033] Figure 2 This is a front view showing an example of the electric contact terminal according to the present invention.

[0034] Figure 3It is a perspective view showing an example of the electric contact terminal according to the present invention.

[0035] Figure 4 This is a front view showing another example of the electric contact terminal according to the present invention. DETAILED DESCRIPTION

[0036] Hereinafter, specific embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0037] Figure 2 is a front view showing an example of an electrical contact terminal according to the present invention, Figure 3 It is a perspective view showing an example of the electric contact terminal according to the present invention.

[0038] The electrical contact terminal 100 includes: a foamed elastic core 110 ; a silicone adhesive 120 coated on the outer surface of the elastic core 110 ; and a conductive sheet 130 , which is wound around the elastic core 110 with the silicone adhesive 120 interposed therebetween and formed with a polymer coating 135 .

[0039] A double-sided conductive pressure-sensitive adhesive tape 140 may be included as needed, and the double-sided conductive pressure-sensitive adhesive tape 140 covers and bonds the lower surface of the conductive sheet 130 separated at both ends.

[0040] The electric contact terminal 100 with the double-sided conductive pressure-sensitive tape 140 attached thereto is adhered to an object for easy use, and the electric contact terminal 100 without the double-sided conductive pressure-sensitive tape 140 attached thereto can be inserted into a groove of the object for use.

[0041] The foamed elastic core 110 can be made of polyurethane rubber or a foam (sponge) of silicone suitable for high temperatures. The silicone adhesive 120, as a thermosetting silicone, will not be melted again by heat and maintains adhesion, thereby improving the elasticity and elastic recovery rate of the electrical contact terminal 100 at room temperature or high temperature.

[0042] When the elastic core 110 is a foam, a surface layer may be formed on a pair of surfaces of the foam corresponding to each other. In this case, the silicone adhesive 120 applied on the surface layer is not absorbed by the foam, so that the amount of adhesive can be reduced.

[0043] The foam is formed to have a quadrilateral end surface, and in the process of forming the elastic core 110, the quadrilateral shape may be maintained, or may be deformed into a rectangle with rounded corners on both sides of the upper surface.

[0044] The two side end faces along the length direction exposed on the outer surface of the elastic core 110 have an open hole structure so that air can be easily discharged through the pores of the elastic core 110, so that more pressure can be applied with less force, and when the force is removed, air can flow in to improve the elastic recovery force.

[0045] Although not shown in the figure, the elastic core 110 of the present invention can be a heat-resistant silicone tube with through holes formed along the length direction. In this case, since the surface of the tube is smooth, the amount of adhesive can be minimized, it can be used at high temperatures, and it can be provided in a variety of shapes under the premise of being economical.

[0046] The conductive sheet 130 is formed by electrolessly plating woven nylon or polyester fibers with nickel, copper, silver, or gold, thereby forming a metal layer on the outermost layer.

[0047] Furthermore, since the conductive fibers are woven, holes are formed in the thickness direction, and the size of the holes is preferably as small as possible.

[0048] The woven fiber thickness may be 0.015 mm to 0.01 mm.

[0049] In the case where the outer surface of the woven fiber is black due to the metal layer as the outermost layer, it may be plated with nickel, or may be coated with a conductive paint containing conductive carbon.

[0050] A polymer coating layer 135 is formed on the inner surface of the conductive sheet 130 , and is formed to a degree that can block pores formed in the plated conductive sheet 130 in the thickness direction after weaving.

[0051] Since the polymer coating 135 is formed on the woven fiber plated with the metal layer and the surface of the fiber is curved, the thickness thereof is not uniformly constant, but may be approximately about 0.001 mm to 0.007 mm.

[0052] The polymer coating 135 can be formed on one surface of the plated fiber by single-sided casting or transfer printing, and the material can be a polymer resin adhesive with high heat resistance.

[0053] Liquid silicone adhesive corresponding to the silicone adhesive 120 is sandwiched on the polymer coating 135 of the conductive sheet 130 to wrap around the elastic core 110 . When heat and pressure are applied, the silicone adhesive 120 hardens and bonds the elastic core 110 and the polymer coating 135 .

[0054] As described above, in the conductive sheet 130 , the polymer coating layer 135 is formed with a relatively thin thickness on the inner surface facing the silicone adhesive 120 .

[0055] from Figure 2 As shown in the enlarged circle portion of , the conductive sheet 130 is formed by weaving weft and warp filaments 132 , and a polymer coating 135 is formed on the inner surface of the conductive sheet 130 .

[0056] Specifically, a liquid polymer coating liquid is thinly applied to the inner surface of the conductive sheet 130 and hardened to form a polymer coating 135. At this time, the polymer coating liquid completely covers the inner surface of the conductive sheet 130, and a portion of it is squeezed out to the outer surface opposite to the inner surface through the gaps 133 between the woven fibers 132 to form a leakage layer 136.

[0057] At this time, the coating amount of the polymer coating liquid is controlled so that the formed leakage layer 136 does not protrude more than the upper limit height L of the conductive sheet 130 .

[0058] The coating amount of the polymer coating liquid is controlled by adjusting the viscosity of the polymer coating liquid and the coating speed.

[0059] According to such a structure, when the liquid silicone adhesive 120 is applied to the polymer coating 135 and then hardened, the liquid silicone adhesive 120 will not leak out of the polymer coating 135. As a result, the polymer coating 135 of the conductive sheet 130 and the silicone adhesive 120 will not be in electrical contact with the conductive object located on the outer surface of the conductive sheet 130.

[0060] As a result, there is an advantage that the surface of the conductive fiber is in direct electrical contact with the conductive object, and the resistance between the electrical contact terminal and the conductive object is smaller than when there is silicone adhesive protruding outside the fiber surface.

[0061] Figure 4 This is a front view showing another example of the electric contact terminal according to the present invention.

[0062] In this embodiment, the elastic core 210 includes a foamed body 211 and a non-foamed elastic body 212 , and an adhesive is placed at a lower portion of the foamed body 211 to be laminated with the foamed body 211 .

[0063] In this case, considering the operating distance, compression force and elastic recovery rate of the electrical contact terminal, preferably, the height of the foam body 211 can be higher than the height of the non-foamed elastomer 212, and the hardness and compression force of the foam body 211 can be smaller than the hardness and compression force of the non-foamed elastomer 212.

[0064] The foamed body may have the same material, structure and features as those of an embodiment, and the non-foamed elastic body may be heat-resistant silicone and may be formed with or without holes.

[0065] According to such a structure, the non-foamed elastic body 212 located at the lower part is mainly used for maintaining the overall shape, and the foamed body 211 located at the upper part is mainly used for pressing force, operating distance and elastic recovery.

[0066] The above is described mainly based on the embodiments of the present invention, but various changes can be made by those skilled in the art. Therefore, the protection scope of the present invention should not be limited to the above embodiments and should be interpreted by the contents described in the claims.

Claims

1. An elastic electrical contact terminal, as an elastic electrical contact terminal placed between opposing objects to electrically connect the opposing objects, characterized in that: include: Elastic core; A silicone adhesive is applied to the outer surface of the elastic core; as well as The conductive sheet is sandwiched with the silicone adhesive and is wound and bonded to the elastic core. The conductive sheet is formed by plating a metal layer on the woven fibers. A polymer coating layer bonded to the silicone adhesive is formed on the inner surface of the conductive sheet opposite to the silicone adhesive. A portion of the liquid polymer coating liquid corresponding to the polymer coating is squeezed out to the outer surface of the conductive sheet through the gaps between the woven fibers to form a leakage layer. The leakage layer does not protrude more than the upper limit height of the conductive sheet, so as not to be in direct contact with the object, and the outer surface of the conductive sheet is in direct electrical contact with the opposite object, The silicone adhesive is prevented from being squeezed out to the outer surface of the conductive sheet by the polymer coating.

2. The elastic electrical contact terminal according to claim 1, characterized in that: The elastic core is a foam body having skin layers formed on a pair of surfaces corresponding to each other on the end surfaces, and both side end surfaces along the length direction exposed to the outside have an open-cell structure.

3. The elastic electrical contact terminal according to claim 2, characterized in that: The elastic core further comprises: The non-foamed elastic body is laminated under the foamed body by sandwiching the silicone adhesive.

4. The elastic electrical contact terminal according to claim 3, characterized in that: The height of the foamed body is greater than the height of the non-foamed elastic body.

5. The elastic electrical contact terminal according to claim 3, characterized in that: The hardness and compression force of the foamed body are smaller than those of the non-foamed elastic body.

6. The elastic electrical contact terminal according to claim 1, characterized in that: The elastic core is a silicone tube.

7. The elastic electrical contact terminal according to claim 1, characterized in that: The silicone adhesive is formed by applying liquid silicone corresponding to the silicone adhesive and then hardening it.

8. The elastic electrical contact terminal according to claim 1, characterized in that: The coating amount of the liquid polymer coating liquid is controlled by adjusting the viscosity of the liquid polymer coating liquid and the coating speed, so that the formed leakage layer does not protrude more than the upper limit height of the conductive sheet.

9. The elastic electrical contact terminal according to claim 1, characterized in that: Also includes: The double-sided conductive pressure-sensitive tape covers and bonds the outer surface of the conductive sheet bonded to the lower surface of the elastic core in a spaced manner.

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