JP4726827B2 - Electromagnetic shielding gasket - Google Patents

Description

  The present invention belongs to the technical field of electromagnetic shielding gaskets.

  There are electromagnetic shielding gaskets that are flexible and excellent in elasticity, such as those in which a conductive cloth is wrapped around a sponge, and those in which the outer periphery of the sponge or rubber tube is covered with a metal wire mesh. The heat resistance is limited, and it is not suitable for devices used at high temperatures.

  On the other hand, there are also gaskets made of metal to increase heat resistance. For example, there are gaskets knitted with only metal springs and metal wires, and gaskets knitted with springy wires.

Metal springs are elastic but have difficulty in flexibility (especially in corner processing). Gaskets knitted with metal wires are flexible but poor in elasticity.
If the gasket is knitted with a springy wire, both flexibility and elasticity can be obtained. However, there are difficulties in productivity. Specifically, the shape and elasticity can not be obtained unless it is knitted with a wire with a certain degree of springiness, but the knitting needle is easily damaged due to the strong springiness of the wire itself. There is a problem that productivity is not good.
Japanese Patent Laid-Open No. 11-68377 JP-A-7-162185

  An object of the present invention is to provide a gasket for electromagnetic wave shielding excellent in flexibility, elasticity and heat resistance.

The electromagnetic shielding gasket according to claim 1,
A plurality of mesh bodies obtained by knitting metal wires having a wire diameter of 0.02 mm to 0.08 mm in a tubular shape by knitting are bundled into a bundle shape.

  The electromagnetic wave shielding gasket is excellent in heat resistance because a plurality of mesh bodies in which metal wires are knitted into a cylindrical shape by knitting are bundled together, that is, the material is a metal wire.

  The metal wire has springiness means a property that elastically deforms when a bending force is applied and elastically recovers when the force is released. Examples of such metal wires having spring properties include SUS wire, beryllium copper wire, steel wire, etc., but since the wire diameter is 0.02 mm to 0.08 mm, this is knitted into a cylindrical shape by knitting. When doing this, a large load is not applied to the knitting needle. Therefore, breakage of the knitting needle is unlikely to occur, and there is no possibility that productivity is reduced due to breakage of the knitting needle.

It is also possible to increase the overall conductivity by using different types of metal wires in combination, for example, using a SUS wire or a steel wire that is inferior in conductivity and a beryllium copper wire.
A mesh body in which metal wires are knitted into a cylindrical shape by knitting, a small loop is formed for each stitch of knitting, and these function as a small spring, and are excellent in elasticity. In addition, since the knitting is knitted, it is easy to deform the adjacent stitches close to each other (increase the amount of overlapping of the eyes) or the reverse deformation, so that the flexibility is excellent.

  And since it is the structure which bundled together the above-mentioned several mesh bodies and was made into a bundle shape, even when elasticity is insufficient with a single mesh body, sufficient elasticity is acquired and a softness | flexibility can also be ensured. That is, the electromagnetic wave shielding gasket is excellent in flexibility, elasticity and heat resistance, and has good productivity.

Although there is no particular limitation on the method of bundling a plurality of mesh bodies, the configuration described in claims 2 to 7 is recommended.
First, a configuration according to claim 2 is a configuration in which an outer casing made of a metal wire is attached to an outer circumference of a core made of a plurality of mesh bodies, and a metal is attached to the outer circumference of the core. If the wire is spirally wound, the annular metal wire (many) is wound around the outer periphery of the core material, or the metal wire is knitted into a mesh shape and wound around the outer periphery of the core material, for example, As a result, it becomes difficult to collect as an electromagnetic shielding gasket, and the handling property is also improved.

  When the outer periphery of the core composed of a plurality of mesh bodies is covered with an outer mesh body formed by knitting metal wires into a cylindrical shape as described in claim 3, the outer periphery becomes an outer mesh body. Therefore, it is difficult to fray and the like as a gasket for electromagnetic wave shielding is improved, and the handleability is also improved.

  Moreover, the electroconductivity of the electromagnetic wave shielding gasket can be improved (the resistance value is lowered) by using a good conductor (for example, monel wire) as the metal wire forming the outer mesh body. This also applies to claims 5 and 6.

As described in claim 4, a plurality of mesh bodies can be applied to form a bundle, or a plurality of mesh bodies can be braided to form the bundle as described in claim 5. You can also.

  Furthermore, as described in claim 6, the outer periphery of a core material formed by covering a plurality of mesh bodies may be covered with an outer mesh body knitted with metal wires in a cylindrical shape. According to a seventh aspect of the present invention, the outer periphery of the core material formed by braiding a plurality of the mesh bodies may be covered with the outer mesh body obtained by knitting metal wires into a cylindrical shape. .

Next, embodiments of the present invention will be described based on examples of the present invention. The present invention is not limited to the following examples and the like, and it goes without saying that the present invention can be implemented in various ways without departing from the gist of the present invention.
[Example]
As shown in FIG. 1, the electromagnetic wave shielding gasket 1 of the present embodiment has an outer mesh body 4 with an outer periphery of a core material 3 formed by braiding a plurality (8 to 16) mesh bodies 2 into a bundle. It has a covered structure. In FIG. 1, the mesh body 2 and the outer mesh body 4 are described in a cylindrical shape, but since both are knitted metal wires, the actual cylindrical shape is not obtained.

  The mesh body 2 is formed by knitting a SUS wire Ws having a wire diameter of 0.04 mm into a cylindrical shape having a diameter of about 2 mm by knitting as shown in FIG. In addition, as illustrated in FIG. 1C, mixed knitting may be performed using different types of wires W1 and W2 (or using three or more types).

The mesh body 2 is braided to form a core material 3.
The outer mesh body 4 is formed by knitting a Monel wire Wm having a wire diameter of 0.04 mm into a cylindrical shape by knitting as shown in FIG.

  When the outer mesh body 4 is knitted, the core material 3 is supplied to the knitting machine, and the outer mesh body 4 is knitted so as to enclose the core material 3 so that the outer periphery of the core material 3 is externally meshed as shown in the figure. Covered with body 4.

  The core material 3 formed by blade knitting is not well-organized (roughened) as it is, so that the diameter of the outer mesh body 4 is set to be appropriately compressed to equalize this roughness. It is preferable to do this. Therefore, the diameter of the outer mesh body 4 is the diameter of the mesh body 2 constituting the core material 3, the number of the mesh bodies 2, the material of the mesh body 2 (SUS wire, beryllium copper wire, steel wire, etc.), the braided stitch It is desirable to set according to the dimensions.

  The electromagnetic wave shielding gasket 1 uses a core material 3 having a structure in which a plurality of mesh bodies 2 formed by knitting SUS wire Ws in a tubular shape by knit knitting are braided into a bundle shape. Is excellent.

  The SUS wire Ws is a metal wire having a spring property, but since its wire diameter is 0.02 to 0.08 mm (0.04 mm in this embodiment), the SUS wire Ws is knitted into a cylinder by knitting. There is no heavy load on the knitting needle. Therefore, breakage of the knitting needle is unlikely to occur, and there is no possibility that productivity is reduced due to breakage of the knitting needle.

  The mesh body 2 in which the SUS wire Ws is knitted into a cylindrical shape by knitting is formed with a small loop for each stitch of knitting, and functions as a small spring, so that it is excellent in elasticity. In addition, since the knitting is knitted, it is easy to deform the adjacent stitches close to each other (increase the amount of overlapping of the eyes) or the reverse deformation, so that the flexibility is excellent.

  Since the core material 3 has a structure in which a plurality of mesh bodies 2 are bundled together by blade knitting, a single mesh body 2 can obtain sufficient elasticity even when the elasticity is insufficient, and flexibility. Can also be secured.

That is, the electromagnetic shielding gasket 1 is excellent in flexibility, elasticity, and heat resistance, and also has good productivity.
The core material 3 of the present embodiment can be used as it is as an electromagnetic wave shielding gasket, but it is difficult to handle the core material 3 by simply braiding it. However, by covering this with the outer mesh body 4, it becomes difficult to fray and the like as a gasket for electromagnetic wave shielding is improved, and the handleability is also improved. For example, it can be easily inserted into a groove. In addition, since the outer mesh body 4 is also knitted with a metal wire, the flexibility and elasticity of the core material 3 are not impaired.

  The braided core material 3 has a resistance value of about 1 to 5 Ω / m (can be used as an electromagnetic shielding gasket), but the outer mesh body 4 has a resistance value of 0. It was possible to improve the conductivity to 1 Ω / m or less.

  When using different types of metal wires as shown in FIG. 1C, for example, if SUS is used as the wire W1 and a beryllium copper wire is used as the wire W2, the conductivity of the mesh body 2 and thus the core material 3 is used. Will be better.

Further, as shown in FIG. 1D, a plurality of wires W1 and W2 may be knitted together. In this case, the wires W1 and W2 may be the same material or different materials.
The formation of the core material 3 by the mesh body 2 is not limited to blade knitting, and a plurality of mesh bodies 2 may be simply bundled or may be formed in a rope shape by applying a plurality of mesh bodies 2.
[Others]
In the embodiment, the electromagnetic shielding gasket 1 has a circular cross-sectional shape. However, depending on the arrangement of the mesh body 2, a triangle as shown in FIG. 2A, a quadrangle as shown in FIG. D-shape such as, P-shape and dumbbell-shaped in FIG. In any case, since it is a knitted metal wire, it does not become an exact circle, triangle, square or the like.

Structure explanatory drawing (a) of electromagnetic wave shielding gasket of an Example, knitting knitting explanatory drawing (b), knitting knitting modification explanatory drawing (c), co-knitting demonstrating drawing (d). The illustration of the cross-sectional shape of the gasket for electromagnetic wave shielding.

Explanation of symbols

1 ... gasket for electromagnetic shielding,
2 ... Mesh body,
3. Core material,
4 ... Outer mesh body,
Ws ... SUS wire,
Wm ... Monel wire.

Claims (7)

A gasket for electromagnetic wave shielding, characterized in that a plurality of mesh bodies obtained by knitting a metal wire having a wire diameter of 0.02 mm to 0.08 mm in a tubular shape by knitting are bundled into a bundle. The gasket for electromagnetic wave shielding according to claim 1, wherein an outer casing made of a metal wire is attached to an outer periphery of a core made of a plurality of mesh bodies. 2. The electromagnetic shielding gasket according to claim 1, wherein an outer periphery of a core material composed of a plurality of mesh bodies is covered with an outer mesh body formed by knitting metal wires into a cylindrical shape. The gasket for electromagnetic wave shielding according to claim 1, wherein the bundle is formed by covering with a plurality of mesh bodies. The electromagnetic shielding gasket according to claim 1, wherein a plurality of mesh bodies are braided into the bundle shape. The electromagnetic shielding gasket according to claim 1, wherein the outer periphery of a core material formed by covering the plurality of mesh bodies is covered with an outer mesh body formed by knitting metal wires into a cylindrical shape. 2. The electromagnetic shielding gasket according to claim 1, wherein the outer periphery of a core material formed by braiding a plurality of mesh bodies is covered with an outer mesh body obtained by knitting metal wires into a cylindrical shape.

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