JPH0140232Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a flooring material having electromagnetic wave shielding properties.

As is already well known, with the development of electronics in recent years, many electrical and electronic devices are being used, and electromagnetic waves generated from these electrical and electronic devices themselves or other mechanical devices can be transmitted to other electrical and electronic devices. The impact of this is becoming a problem. At the same time, as the use of synthetic resins for various types of equipment is progressing, there is a demand for synthetic resins to be electrically conductive and provide electromagnetic shielding properties.

In order to meet this demand, the inventors of the present invention have repeatedly investigated sheet-shaped electromagnetic shielding materials using thin metal plates or foils with high conductivity. Some of the results are, for example, published in Utility Model Application Publication No. 58-29983,
Or, as seen in Japanese Utility Model Application Publication No. 58-66693,
It is already publicly known.

These sheet-shaped electromagnetic wave shielding materials have superior electromagnetic wave shielding performance compared to paint-type or molding resin-type materials mixed with conductive carbon black or metal fillers (in particular, the
The electromagnetic wave shielding material described in No. 58-93737 has a thickness of 100μ and is suitable for copper plates or iron plates of 1 mm or more), is flexible, easy to cut, and has a depth of 1 to 1 mm. It was superior to copper plates, iron plates, etc. in terms of workability, such as being able to be deep-drawn into a container shape of about 2 cm. Therefore, these electromagnetic shielding materials were suitable for use by pasting them on the inner and outer surfaces of the housings of electrical and electronic equipment, or on the walls and ceilings of electromagnetic shielding rooms, but they were highly conductive. It is made of a laminated material in which a thin metal plate or foil is laminated with plastic film, paper, cloth, etc., so even if it is attached to the bottom outer surface of the housing of electrical/electronic equipment, it is useless to protect the housing from impact. Ta. Furthermore, when it was used as a floor covering for a shielded room, it was extremely cold and difficult to get used to.

The present invention was developed in light of the above circumstances, and is a protective material that can be attached to the bottom outer surface of the housing of electrical and electronic equipment to protect the housing with excellent electromagnetic shielding performance and rich cushioning properties. is intended to provide. Furthermore, instead of being adhered to the outer surface of the bottom of the housing, the protective material of the present invention may be spread on the floor on which the housing is installed, or may be used as a floor covering for a shielded room.

That is, the present invention involves adhering a raised sheet to the surface of a highly conductive metal thin plate or foil, or a laminated material containing this metal thin plate or foil, and providing a sealant layer on the back side via an adhesive layer. It is a protective material with a characteristic electromagnetic wave shielding property.

In the present invention, the highly conductive metal thin plate or foil is an electrolytic copper foil with a thickness of 9μ or more, an electroformed iron foil with a purity of 99.95% or more made by electroforming with a thickness of 15 to 150μ, or one side of this electrocast iron foil or gold on both sides,
Preferably, the foil is plated with different metals such as silver, copper, tin, lead, zinc, chromium, nickel, etc.
In addition, annealed rolled iron foil can also be used.

In addition, as a laminated material containing a highly conductive metal thin plate or foil, a laminate is used in which the electrolytic copper foil and plated or unplated electrocast iron foil are laminated with an insulating sheet interposed between them. can.

Further, as the raised sheet, in addition to raised cloth, felt or the like can be used.

Hereinafter, the present invention will be explained with reference to the drawings. The drawings all show embodiments of the present invention, and FIG. 1 is a sectional view of the protective material.

In FIG. 1, 1 indicates the above-mentioned raised sheet, 3 indicates a highly conductive metal thin plate or foil, or a laminated material (hereinafter referred to as "metal material") containing this metal thin plate or foil. Reference numeral 2 denotes an adhesive layer for laminating these two layers, and is made of a urethane adhesive, an epoxy adhesive, or the like.

Further, 5 is a sealant layer for heat-sealing the housing of electrical/electronic equipment or the floor of a shield room, and this sealant layer 5 is attached to the metal material 3 through an adhesive layer 4 such as urethane or epoxy. are laminated on. The sealant layer 5 may be made of polyolefin resin such as polyethylene or polypropylene, polyolefin copolymer such as ethylene-(meth)acrylate copolymer or ethylene-vinyl acetate copolymer, or unsaturated carboxylic acid. Any thermoplastic resin can be used, including modified polyolefin resins such as graft-modified polyolefins and ionomers, polyvinyl chloride, nylon, and polyester.

The present invention has the above-mentioned structure, and not only has excellent electromagnetic shielding performance, but the cushioning properties of the brushed sheet can protect the housing, and it also provides warmth when used as a flooring material for shielded rooms. It is. It also has excellent workability, such as being flexible and easy to cut, but it also has a sealant layer on the back, so it can be used in electrical and electronic equipment as well as on floors. , which has the advantage of being easier to construct.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention, and FIG. 1 is a cross-sectional view of the protective material of the present invention. 1...Napped sheet, 2, 4...Adhesive layer, 3
...Metal material, 5...Sealant layer.

Claims (1)

[Scope of utility model registration request] An electromagnetic shield characterized by adhering a raised sheet to the surface of a highly conductive thin metal plate or foil, or a laminated material containing this thin metal plate or foil, and providing a sealant layer on the back side via an adhesive layer. A protective material with properties.