KR-102961771-B1 - Elastic Capacitor

KR102961771B1KR 102961771 B1KR102961771 B1KR 102961771B1KR-102961771-B1

Abstract

An elastic capacitor with good elasticity, having a large capacitance and minimized electrical short circuits, is disclosed. The capacitor comprises an electrically conductive member composed of a dielectric layer made of a flexible polymer film and first and second metal layers formed on one side and the other side of the dielectric layer, respectively, and electrically contacting first and second electrically conductive objects. When the first electrically conductive object presses the capacitor, the first electrically conductive object comes into electrical contact with the first metal layer and the second electrically conductive object comes into electrical contact with the second metal layer, thereby forming a capacitance.

Inventors

김선기
박병주

Assignees

조인셋 주식회사

Dates

Publication Date: 20260513
Application Date: 20250311

Claims (20)

As an elastic capacitor interposed between opposing first and second objects, The above capacitor comprises an electrically conductive member composed of a dielectric layer made of a flexible polymer film and first and second metal layers formed respectively on one side and the other side of the dielectric layer, and The above electrically conductive member is, A first contact portion in which the first metal layer contacts the first object; A first bending portion extending from the first contact portion; A connecting part extending from the first bending part; A second bending portion extending to the above-mentioned connecting portion; and It is formed with a second contact portion extending from the second bending portion and in which the second metal layer contacts the second object, and An elastic core is fitted into the space formed between the above connecting part and the first contact part, and An elastic capacitor characterized by the above capacitor having an elastic restoring force through the first bending portion and the core, wherein the first object contacts the first metal layer of the first contact portion and the second object contacts the second metal layer of the second contact portion.
In claim 1, An elastic capacitor characterized by having another elastic core inserted into the space formed between the above-mentioned connection part and the above-mentioned second contact part.
In claim 1, The above electrically conductive member has a vertical cross-section in the shape of an S, and An elastic capacitor characterized by the above-mentioned connecting portion and the above-mentioned second contact portion being joined to each other.
In claim 1, An elastic capacitor characterized in that the capacitance of the above capacitor is determined by the overlapping area of the first and second metal layers formed on the dielectric layer, regardless of the contact area of the first and second objects.
As an elastic capacitor interposed between opposing first and second objects, The above capacitor comprises an electrically conductive member composed of a base metal layer, an adhesive layer formed on the base metal layer, a dielectric layer bonded to the adhesive layer, and a first metal layer formed on the dielectric layer. The above electrically conductive member is, A first contact portion in which the first metal layer contacts the first object; A bending portion extending from the first contact portion; and It is formed with a second contact portion extending from the above bending portion and in which the base metal layer contacts the second object, and An elastic core is fitted into a receiving space formed between the first contact part and the second contact part, and An elastic capacitor characterized in that the capacitor has an elastic restoring force through the bending portion and the core, and the first object contacts the first metal layer of the first contact portion and the second object contacts the base metal layer of the second contact portion to form a capacitance.
In claim 5, An elastic capacitor characterized in that one end of the base metal layer extends further from the electrically conductive member, and an extension portion is formed in the extended portion where the first metal layer and the dielectric layer are not formed.
In claim 5, An elastic capacitor characterized by having a second metal layer further formed between the dielectric layer and the adhesive layer.
◈Claim 8 was waived upon payment of the establishment registration fee.◈ In claim 7, An elastic capacitor characterized by the adhesive layer having electrical conductivity.
◈Claim 9 was waived upon payment of the establishment registration fee.◈ In claim 7, An elastic capacitor characterized in that the capacitance of the capacitor is determined by the overlapping area of the first metal layer formed in the dielectric layer and the base metal layer, or the first and second metal layers and the base metal layer, regardless of the contact area of the first and second objects.
In claim 1 or 7, An elastic capacitor characterized in that at least one of the first and second metal layers is thinner than the thickness of the dielectric layer.
◈Claim 11 was waived upon payment of the establishment registration fee.◈ In claim 7, An elastic capacitor characterized in that the thickness of the first and second metal layers is thinner than the thickness of the base metal layer, and the mechanical strength of the first and second metal layers is lower than the mechanical strength of the base metal layer.
◈Claim 12 was waived upon payment of the establishment registration fee.◈ In claim 1 or 7, At least one of the first and second metal layers is formed by sputtering a metal and plating a metal on the dielectric layer, or by adhering a metal foil on the dielectric layer. An elastic capacitor characterized by the fact that the thickness of the metal sputtered and plated is thinner than the thickness of the metal foil.
In claim 7, An elastic capacitor characterized by having a portion of the metal layer removed from the edges of the first metal layer, the second metal layer, and the base metal layer such that at least a portion of the edges of the first metal layer, the second metal layer, and the base metal layer are located inside the edges of the dielectric layer.
◈Claim 14 was waived upon payment of the establishment registration fee.◈ In claim 1 or 7, An elastic capacitor characterized in that, in the first contact portion, the end of the electrically conductive member is bent toward the side of the core to form a bent portion, and the bent portion is adhered to a part of the side of the core.
In claim 1 or 7, The above core is a foam, and An elastic capacitor characterized in that the above-mentioned core is wrapped by a polymer cover with an adhesive interposed therebetween.
◈Claim 16 was waived upon payment of the establishment registration fee.◈ In claim 15, An elastic capacitor characterized in that the polymer cover is bonded to the metal layer by another adhesive.
In claim 1 or 7, An elastic capacitor characterized in that the dielectric layer has a dielectric constant of 2 to 4 at 1 GHz, a dielectric loss coefficient of less than 0.9, and heat resistance corresponding to soldering.
In claim 7, An elastic capacitor characterized in that the value of the capacitance changes to 10% or less until the capacitor starts electrical contact with the object and is pressed by 40%.
In claim 7, The first object is electrically conductive or electrically insulating, and the second object is electrically conductive, and An elastic capacitor characterized in that, after the lower surface of the second metal layer or the base metal layer is electrically and mechanically fixed and connected to the second object by an electrically conductive adhesive, soldering, or welding, the upper surface of the first metal layer is pressed by pressure from the first object to make elastic electrical contact with the first object.
As an elastic capacitor interposed between opposing first and second objects, The above capacitor comprises an electrically conductive member composed of a base metal layer, an adhesive layer formed on the base metal layer, a dielectric layer bonded to the adhesive layer, and a first metal layer formed on the dielectric layer. The above electrically conductive member is, A first contact portion in which the first metal layer contacts the first object; A bending portion extending from the first contact portion; A connecting part extending horizontally from the above bending part; It is formed with a second contact portion extending from the above connecting portion and in which the base metal layer contacts the second object, and An elastic core is fitted into a receiving space formed between the above connecting part and the second contact part, and An elastic capacitor characterized in that the capacitor has an elastic restoring force through the bending portion and the core, and the first object contacts the first metal layer of the first contact portion and the second object contacts the base metal layer of the second contact portion to form a capacitance.

Description

Elastic Capacitor The present invention relates to an elastic capacitor that is interposed between objects to provide capacitance, and in particular to an elastic capacitor with good elasticity that has a large capacitance and minimizes electrical short circuits. Elastic electrical connection terminals are used to electrically connect electrically conductive objects, such as metal cases or circuit boards. Examples of such elastic electrical connection terminals include an electrical connection terminal formed by pressing a thin metal plate with a press mold and bending it into a Z shape to give it elasticity, or an electrical connection terminal formed by creating an electrically conductive material on an elastic rubber tube. However, these electrical connection terminals are interposed between electrically conductive objects and serve to electrically connect opposing objects with elasticity, but since the electrical connection terminals do not have a capacitor with capacitance built in, it is difficult for the electrical connection terminals themselves to function as a filter to remove high-frequency noise entering the electrical connection terminals or as a sensor utilizing capacitance. Typically, capacitors can store current or act as sensors without passing electricity in direct current (DC), while in alternating current (AC), they function as filters that allow current to pass through and remove some of the high-frequency noise in the case of high frequencies. As is well known, capacitance C is calculated using the following Equation 1. Here, ε is the permittivity, S is the area of the electrode overlapping with the dielectric, and d is the thickness of the dielectric. However, in order for high frequencies to pass through a high-frequency circuit without loss, it may be desirable for the dielectric material to have a low ε (permittivity) or Df (dielectric loss coefficient) and a large capacitance. Therefore, in order to increase the capacitance under conditions where the permittivity and dielectric loss factor are low, it is desirable that the area S of the overlapping electrodes be large and the thickness d of the dielectric be thin. Here, under the same conditions, reducing the thickness of the dielectric layer increases the capacitance, but there is a problem in that a short circuit may occur where two adjacent opposing electrodes are electrically connected to each other. As a technology that solves part of these problems, Korean Patent Registration No. 1743989 by the present applicant discloses an elastic composite filter comprising: an elastic core; a first electrically conductive layer that wraps around and adheres to the core; a dielectric layer made of a polymer or rubber material that wraps around and adheres to the first electrically conductive layer such that a portion of the first electrically conductive layer, including the lower surface, is exposed; and a second electrically conductive layer that wraps around and adheres to cover at least the upper surface of the dielectric layer. However, according to this technology, the area where the first and second electrically conductive layers providing capacitance overlap is structurally small, so there is a disadvantage that it is difficult to provide a large amount of capacitance. For example, since the second electrically conductive layer is formed only on a part of the upper surface of the dielectric layer and the overlapping area between the first and second electrically conductive layers is small, the capacitance provided according to Equation 1 above is small. In addition, there are structural limitations in providing an insulating layer or conductive contact member uniformly and economically. In another technology, Japanese published patent 2011-96601 discloses a contact member that contacts two conductive members, characterized by being made of a conductive thin plate, having a base member that contacts one conductive member, a conductive contact member that contacts the other conductive member, and an insulating layer that insulates the base member and the contact member. The base member is formed by press-forming a thin sheet of copper alloy, the insulating layer is formed by applying an epoxy resin film, and the contact member is a thin film formed on the insulating layer and is formed by applying an Ag-coated ink paste to Ni. However, according to this technology, as explained above, it is structurally difficult to provide a large amount of capacitance, and there are limitations in preventing an electrical short circuit between the base member and the conductive contact member. In addition, it is difficult to provide a thickness of, for example, 0.015 mm or less of the copper alloy thin sheet that provides elasticity, and there are limitations in structurally providing an insulating layer or a conductive contact member uniformly and economically. Furthermore, since a separate elastic core that provides separate elasticity is not emb