JPH05226869A - Electromagnetic countermeasure gasket and its manufacture - Google Patents

Abstract

PURPOSE:To enable a gasket to be molded into an arbitrary shape according to the size and shape of a place to use it by covering the periphery of an elastic body with a metal net smaller than the elastic body in elasticity and capable of being molded into a predetermined shape. CONSTITUTION:An electromagnetism countermeasure gasket 10 is constituted by covering the periphery of a silicon rubber (elastic body) 20, a slender rod of recess shape in cross section, with a net body (metal net) 30 made of aluminum alloy of small elasticity. This metal net 30 can be molded into a predetermined shape because of being plastically deformed by external force. The metal net 30 has an elasticity smaller than that of the elastic body 20; therefore, the shape of the whole gasket 10 is retained as the shape of the molded metal net 30. This makes the elastic body 20 retained to the shape of the metal net 30 by molding the metal net 30 into a predetermined shape with the result that an electromagnetism countermeasure gasket 10 of a desired shape can be obtained easily.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gasket for electromagnetic protection, which shields electromagnetic waves or prevents static electricity, and a method of manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, there has been a gasket for electromagnetic shielding as disclosed in Japanese Patent Publication No. 2-83998.
Such a conventional electromagnetic shielding gasket covers an elastic body with a coating layer of a conductive metal wire woven in a loop shape, and attaches it in a gap such as a contact portion between a main body of an electronic device housing and a lid. It was electromagnetically shielded.

As the required characteristics of the conventional electromagnetic shielding gasket, the characteristics such as easily adapting to the shape of the gap between the main body of the housing containing the electronic device and the lid and sealing the gap, and the repeated compression. It had a characteristic of having sufficient durability against deformation.

Therefore, in the conventional electromagnetic shielding gasket, the coating layer of the conductive metal wire is flexible and the shape of the coating layer follows the shape of the elastic body, and the overall shape of the gasket is that of the elastic body. It was decided by the shape. The shape of such an elastic body, that is, the shape of the entire gasket is string-shaped or band-shaped and has high flexibility.

[0005]

However, in the case where the shape of the portion to which the electromagnetic shielding gasket is attached is complicated, for example, a portion having irregularities at the edge of the housing or the like,
Rather than using a conventional gasket having high flexibility, using a gasket that holds a predetermined shape corresponding to the shape of the mounting location may facilitate sealing the gap, and the electromagnetic shielding effect may be enhanced.

Further, for example, in order to electromagnetically shield the gap between the corners of the pipe material, a gasket having a predetermined shape corresponding to the gap between the corners may be required. Therefore, the present invention was created for the purpose of providing an electromagnetic shielding gasket that can be molded into an arbitrary predetermined shape according to the size and shape of the place where the gasket is used, and a method for manufacturing the same.

[0007]

The structure of the first aspect of the present invention is characterized in that the periphery of the elastic body is covered with a metal net which is less elastic than the elastic body and can be formed into a predetermined shape. It is a countermeasure gasket.

The second aspect of the present invention is characterized in that the metal net and the elastic body according to the first aspect of the present invention are placed in a mold, and the metal net and the elastic body in the mold are heated and pressurized. This is a method of manufacturing a gasket for electromagnetic protection.

[0009]

In the gasket for electromagnetic protection according to the first aspect of the present invention configured as described above, the elasticity of the metal net covering the periphery of the elastic body is made smaller than that of the elastic body. Therefore, by molding the metal net into a predetermined shape, the elastic body is held in the shape of the metal net, and it is possible to easily obtain the electromagnetic countermeasure gasket having a desired shape. Then, an electromagnetic countermeasure gasket having a shape corresponding to the shape of the mounting location can be obtained, and more effective electromagnetic countermeasure can be realized. Of course, the use of the first aspect of the present invention also exerts the electromagnetic shielding function and the antistatic function of the metal net, and the function of the gasket by the elasticity of the elastic body and the metal net.

Further, in the method of manufacturing the gasket for electromagnetic protection according to the second aspect of the present invention, the metal net is formed into a desired shape by being pressurized in the mold, and the elastic body is also made of metal. While being filled inside the net, it is formed into a desired shape according to the shape of the metal net. That is,
According to the second aspect of the present invention, since the gasket can be formed into a desired shape by using the mold, it is possible to mass-produce the electromagnetic countermeasure gasket having the desired shape.

Furthermore, according to the second aspect of the present invention, an electromagnetic countermeasure gasket having a desired shape can be obtained by simply performing a step of heating and pressurizing a metal net and an elastic body using a mold without requiring other steps. be able to.

[0012]

Embodiments of the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to the examples described in detail below, and includes all examples that can be conceived by those skilled in the art without departing from the gist of the present invention.

As shown in FIG. 1, an electromagnetic countermeasure gasket 10 according to the first embodiment of the present invention is a slender rod-shaped body having a concave cross section, and a silicon rubber 20 has a mesh-like body made of an aluminum alloy having small elasticity. It is configured by being covered with 30. Since the mesh body 30 is plastically deformed by an external force, it can be molded into a predetermined shape.

Moreover, since the mesh body 30 has elasticity smaller than that of the silicone rubber 20, the gasket 10
The overall shape is retained as the shape of the molded mesh body 30. Furthermore, when an external force is applied to the gasket 10, the external force is absorbed by the elasticity of the mesh body 30 and the silicone rubber 20, so that the gasket 10 performs its original function.

Of course, since the mesh body 30 is made of an aluminum alloy, it secures an electrical connection with the ground to prevent static electricity from being generated at the mounting location, and also functions as an electromagnetic wave shield. .. In particular, since the gasket 10 according to the first embodiment is formed to have a concave cross section, it is excellent when it is attached to a joint between the lid of the housing containing the electronic device and the main body and having a ridge. It exhibits an electromagnetic shielding effect.

A method of manufacturing such a gasket 10 will be described.
This will be described below with reference to FIG. That is, first, the net-like body 30 is formed so as to cover the periphery of the silicon rubber 20 molded into a shape such as an elongated rod that is easy to manufacture, and the raw material 40 before molding is produced.

Next, the material 40 is applied to the mold 5 having a desired shape.
It is put into the mold 52 of 0. Further, the material 40 placed in the mold 52 is heated and pressed. Heat and pressurize at the same time.
Pressurization is performed by using a pressing die 54 and applying pressure from above the die 52, for example. By this pressurization, the mesh body 30 is plastically deformed according to the mold 52 and the pressing mold 54, and is molded into a concave sectional shape. Further, by heating, the silicone rubber 20 is also molded into a concave cross-section according to the mold 52 and the pressing mold 54.

In this way, the gasket 10 is easily molded into the desired shape. Moreover, the gasket 10 can be mass-produced by using the mold 52 and the pressing mold 54. Moreover, since the gasket 10 having the desired concave cross-section can be obtained only by heating and pressurizing the material 40 by using the mold 52 and the pressing mold 54, it is not necessary to perform other steps or complicated steps. It is extremely simple.

FIGS. 3 and 4 show a second embodiment and a third embodiment of the present invention, respectively. In the electromagnetic countermeasure gasket 60 according to the second embodiment, as shown in FIG. 3, not only the mesh body 30 covers the periphery of the silicone rubber 20,
The net-like body 32 also enters the inside of the silicone rubber 20, thereby enhancing the electromagnetic shield effect. Reticulate body 32
Is a silicone rubber 2 which is heated in the mold 52 and becomes flexible.
Insert within 0. By such operation, the gasket 60
Is manufactured. In the gasket 60, the silicone rubber 20
The reticulated body 32 inserted inside the is a two-layer
The number of layers is not limited to two and may be any number. A desired electromagnetic wave attenuation effect can be obtained by appropriately changing the number of layers of the mesh body 32.

As shown in FIG. 4, the gasket 70 for electromagnetic protection according to the third embodiment has a through hole 80 formed along the axis of the silicone rubber 20 having a circular cross section. It can be conveniently used when inserting a member to be shielded into the through hole 80. Such a gasket 70
Can be manufactured by a known means using a core mold when heating / pressurizing in the mold 50.

By using core molds of various shapes,
It is possible to obtain a gasket having various hollow portions corresponding to the shape of the core type. Further, neoprene rubber or another elastic body may be used instead of the silicone rubber 20 used in the above-described embodiments. In that case, by appropriately selecting the material of the elastic body according to the electromagnetic countermeasure that the gasket according to the present invention mainly focuses on, such as static electricity countermeasures and electromagnetic shields, the gasket for electromagnetic countermeasures satisfying the required characteristics can be easily obtained. Can be obtained.

[Brief description of drawings]

FIG. 1 is an electromagnetic countermeasure gasket 10 according to a first embodiment.
FIG.

FIG. 2 is an explanatory diagram for explaining a manufacturing method of the gasket 10.

FIG. 3 is a gasket 60 for electromagnetic countermeasures according to the second embodiment.
FIG.

FIG. 4 is a gasket 70 for electromagnetic protection according to the third embodiment.
FIG.

[Explanation of symbols]

10, 60, 70 ... Gasket,
20 ... Silicon rubber, 30 ... Net body,
50 ... Mold, 54 ... Pushing mold, 80 ... Through hole,

Claims (2)

[Claims] 1. A gasket for electromagnetic protection, characterized in that the periphery of an elastic body is covered with a metal net which is less elastic than the elastic body and can be molded into a predetermined shape. 2. A method of manufacturing an electromagnetic protection gasket, comprising placing the metal net and the elastic body in a mold, and heating and pressurizing the metal net and the elastic body in the mold.