JP3071375U - Clip type conductive gasket - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To increase physical coupling force, uniform electric conductivity, increase contact area, decrease contact electric resistance, reduce manufacturing cost and increase production efficiency. To provide a conductive gasket. A conductive metal finger strip inserted into an application portion of an electrical or electromagnetic device for electrically shielding or making electrical contact with electromagnetic interference or radio frequency interference, and dispensed on the finger strip. A clip-type conductive gasket made of a conductive elastic body is configured.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a conductive gasket, and more particularly, to a clip type conductive gasket in which a liquid conductive elastic body is discharged onto a metal finger gasket and cured. Things.

[0002]

[Prior art]

 Electromagnetic interference (EMI) refers to electrical or electromagnetic interference that is induced or emitted from an electrical device or electromagnetic device. Radio frequency interference (RFI) is sometimes used in the same sense as electromagnetic interference, but it is an electromagnetic interference generated between 10 kHz and 10 GHz in the radio frequency band of the electromagnetic spectrum. Means

[0003] There are various technical methods for solving the electromagnetic interference of the electromagnetic or electric devices, but a method of mainly shielding EMI / RFI is used. In order to shield EMI / RFI, a conductive gasket capable of absorbing or reflecting the energy of EMI / RFI between EMI / RFI sources or from the part to be shielded to reduce the energy level. Is inserted. This conductive gasket forms a conductive barrier between EMI / RFI sources to shield EMI / RFI energy from moving, or forms a conductive path to shield generated EMI / RFI energy. Or dissipate as ground.

[0004] Such conductive gaskets are used in various fields, for example, personal cell phones.

FIG. 4 is a perspective view showing that a conventional conductive elastic gasket is applied inside a personal mobile phone. Usually, a rib 10 is integrally formed on the case 14 of the personal mobile phone from the bottom surface for each module of the case 14 for shielding electromagnetic waves. A conductive substance through which electricity flows is applied to the bottom surface of the case 14 and the surface of the rib 10 by a method such as vapor deposition, sputtering or spraying, or the case 14 itself is made of a conductive substance such as magnesium oxide.

As shown in FIG. 4, a conductive elastic gasket 12 is formed on the conductive rib 10 by discharging and hardening a liquid conductive elastic material with a precision dispenser or the like. Is done. Generally, since the width of the rib 10 is very narrow due to the miniaturization of the personal mobile phone, when dispensing the conductive elastic gasket 12 on the conductive rib 10, a precision display attached to the three-axis CNC robot is required. A precision control device such as a spencer is used.

After the conductive elastic gasket 12 is formed on the conductive rib 10 and another conductive member is brought into close contact with the conductive elastic gasket 12 from above, the upper conductive member and the conductive elastic The gasket comes into electrical and mechanical contact. At this time, the upper conductive member and the conductive elastic gasket 12 maintain linear contact along the surface, and a conductive path is formed from the upper conductive member → the conductive elastic gasket → the conductive rib.

FIGS. 5A and 5B are a perspective view and a side view showing that a conventional conductive metal finger gasket is applied inside a personal mobile phone. As shown in the figure, the body 24 of the finger gasket 20 is bent in a U-shape to form a clip shape as a whole, and the opened lower surface is inserted into the conductive rib 10. The finger gasket 20 is generally made of beryllium copper or an elastic metal such as stainless steel or phosphor bronze. An elastic projection 22 is integrally formed on the upper surface of the finger gasket 20 from the main body 24 of the finger gasket 20. Openings 26 are formed on both side surfaces so that the elastic projections 22 can be easily formed.

When such a finger gasket 20 is inserted into the conductive rib 10 and the conductive member presses the upper portion from above, the upper conductive member makes electrical and mechanical point contact with the elastic projection 22 of the finger gasket 20. Then, a conductive path consisting of the upper conductive member → the elastic projection of the finger gasket → the rib is formed.

[0010]

[Problems to be solved by the invention]

 However, in the case of the conventional conductive elastic gasket, there is a disadvantage that the conductive elastic gasket is easily detached from or separated from the conductive rib. In particular, when the surface of the conductive rib is smooth, the interfacial adhesive force between the surface of the conductive rib and the conductive elastic gasket is reduced, and the conductive elastic gasket separates or separates from the conductive rib. Since the contact between the conductive particles distributed in the conductive elastic body and the surface of the conductive rib is not uniform, there is a problem that the electrical contact resistance between them is increased or the electrical conductivity is reduced.

In the case where the portion to which the conductive elastic gasket is applied is a part of the pole of the equipment, a dispenser attached to a three-axis CNC robot for dispensing the conductive elastic gasket. However, there is a problem that the manufacturing cost increases due to the necessity of such a precision control device.

On the other hand, in the case of a conductive metal finger gasket, a portion that is in electrical contact with the upper conductive member is electrically connected only by point contact by the elastic projections of the finger gasket, so that a portion that is in electrical contact is provided. However, there was a problem that the contact electric resistance was large due to the small area.

In addition, since a large number of elastic projections cannot be formed on the finger gasket due to the size limit of the finger gasket, and since the upper conductive member and the finger gasket make mechanical and electrical point contact by the elastic projections, the upper part has When the conductive member and the finger gasket are brought into close contact with each other, there has been a problem that EMI / RFI energy leaks from between the upper conductive member and the finger gasket at a portion where there is no elastic projection.

Accordingly, the present invention has been made in view of such problems, and a first object of the present invention is to provide a conductive gasket having an increased physical bonding force.

A second object of the present invention is to provide a conductive gasket having a uniform electric conductivity, a large contact area and a low contact electric resistance.

A third object of the present invention is to provide a conductive gasket having reduced production costs and increased production efficiency.

[0017]

[Means for Solving the Problems]

 According to a feature of the present invention to achieve the above object, according to the present invention, a conductive metal inserted into an application part of an electrical or electromagnetic device for electrically shielding or making electrical contact with electromagnetic interference or radio frequency interference. A clip-shaped conductive gasket comprising a finger strip and a conductive elastic body dispensed on the finger strip is disclosed.

Here, the conductive metal finger strip is formed in a predetermined length unit and has a rectangular tube shape with one side wall opened, and preferably, both opposing side walls of the finger strip are pressure applied to an application portion. Is formed.

[0019]

[Embodiment of the invention]

 Hereinafter, the clip-type conductive gasket according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a perspective view of a clip-type conductive gasket according to the present invention. As shown, the clip-type conductive gasket 40 according to the present invention includes a conductive metal finger strip 44 inserted into an application portion of an electric or electromagnetic device, and a conductive elastic strip formed on the finger strip 44. It consists of a body 42.

FIG. 2 is a perspective view of the clip type conductive gasket according to the present invention. As shown, the finger strips 44 of the clip-shaped conductive gasket 40 according to the present invention are inserted into the conductive ribs 10. The conductive metal finger strip 44 is formed in a predetermined length unit, has a square tube shape with one side wall opened as a whole, and has a U-shaped cross section.

Preferably, the opposite side walls of the finger strip 44 are formed with bent portions 48 that, after being inserted into the conductive ribs 10, apply pressure to the conductive ribs 10 so as not to separate from the conductive ribs 10. You. Further, both side walls are opened from the bent portion 48 in a direction away from each other.

Hereinafter, a method of manufacturing the clip-type conductive gasket according to the present invention and a method of applying the clip-type conductive gasket to electrical and electromagnetic devices will be described.

First, the finger strips 44 are manufactured in a unit of a fixed length. At this time, unlike the conventional case, it is not particularly necessary to form openings on both side walls. That is, since the finger strips 44 are not separately formed, it is not necessary to form openings on both side walls, but they can be formed if necessary.

A liquid conductive elastic body, for example, a conductive elastomer (elastomer) is dispensed and hardened on the upper part of the finger strip 44 manufactured as described above to manufacture a solid conductive elastic body gasket. At this time, the conductive elastic body dispensed on the finger gasket changes to a solid while hardening, and the adhesive substance in the liquid conductive elastic body maintains the adhesive strength with the finger gasket. That is, the adhesion between the finger gasket and the conductive elastic body can be maintained without using another adhesive.

FIG. 3 is an explanatory view showing a conductive path when the clip-type conductive gasket according to the present invention is applied. As shown in the figure, the clip-shaped conductive gasket 40 is inserted into the conductive rib 10, and when the conductive member 50 presses from above, the upper conductive member 50 is displayed as indicated by an arrow A. → A conductive path composed of the conductive elastic body 42 → the metal finger strip 44 → the conductive rib 10 is formed.

[0027]

[Effect of the invention]

 As described above, according to the present invention, when a conductive elastic gasket is applied to improve EMI / RFI shielding, the use of the clip-type gasket according to the present invention eliminates the need for expensive equipment such as a CNC robot. And save money.

In addition, the conductive gasket according to the present invention is mechanically coupled to the conductive gasket finger strip and the conductive rib, so that the conductive gasket is unlikely to be detached from the conductive rib, and is formed on both side walls of the finger strip. The bent part is firmly connected to apply pressure to the rib.

Further, by increasing the surface roughness of the finger strip, the interfacial adhesion between the conductive elastic body and the finger strip can be increased, and the conductive particles and the finger dispersed in the conductive elastic body can be increased. The electrical conductivity is improved by increasing the contact area with the surface of the strip. In particular, even if the surface of the conductive rib material is smoothed through plating or evaporation, the electrical conductivity is affected by the mechanical coupling between the conductive rib and the metal finger strip. Absent.

Further, even when the conductive elastic gasket is applied to a part of the pole of the conductive rib, the clip-type conductive gasket according to the present invention can be inserted only into the applied part, thereby improving workability. There is.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a clip-type conductive gasket according to the present invention.

FIG. 2 is a perspective view of the clip-type conductive gasket according to the present invention;

FIG. 3 is an explanatory view showing a conductive path when the clip-type conductive gasket according to the present invention is applied.

FIG. 4 is a perspective view to which a conventional conductive elastic gasket is applied.

FIG. 5A is a side view to which a conventional conductive metal finger gasket is applied. (B) is a perspective view to which a conventional conductive metal finger gasket is applied.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 conductive rib 40 clip-type conductive gasket 42 conductive elastic body 44 conductive metal finger strip 48 bent part 50 conductive member

Claims (5)

[Utility model registration claims] 1. A conductive gasket that is applied to an electrical or electromagnetic device for electrically shielding or making electrical contact with electromagnetic interference (EMI) or radio frequency interference (RFI), the application portion of the device. A clip-type conductive gasket comprising: a conductive metal finger strip inserted into the finger strip; and a conductive elastic body dispensed on the finger strip. 2. The clip-type conductive gasket according to claim 1, wherein the conductive metal finger strip is formed in a predetermined length unit and has a rectangular cylindrical shape with one side wall opened. 3. The clip-type conductive gasket according to claim 2, wherein a bent portion for applying pressure to the application portion is formed on the opposite side walls of the finger strip. 4. The clip-type conductive gasket according to claim 1, wherein the conductive metal fingerstrip is a metal having elasticity. 5. The clip-type conductive gasket according to claim 1, wherein conductive particles are dispersed inside the conductive elastic body.