JPH0837394A - Radio wave absorber - Google Patents

Abstract

PURPOSE:To inexpensively provide a wave absorber which has an excellent radio wave absorbing property, sound insulating property, decorativeness, heat insulating property, etc., and is constituted in a light-weight structure. CONSTITUTION:A radio wave absorber is constituted by successively forming a magnetic layer 2, electromagnetic wave reflecting layer, and second light- transmissive substrate 1B on a first light-transmissive substrate 1A and the electromagnetic wave reflecting layer is formed of a porous conductor, melt- sprayed metal, and heat-ray reflecting film having an electromagnetic wave reflecting property. The magnetic layer 2 is formed of magnetic powder mixed in an adhesive layer and the heat-ray reflecting layer having an electromagnetic wave transmitting property and a decorative layer are formed on the first substrate 1A.

Description

Detailed Description of the Invention

[0001]

INDUSTRIAL APPLICABILITY The present invention is applied to the ceiling, inner wall surface, partition wall, floor, etc. of a general building to absorb electromagnetic waves emitted from OA equipment or the like used indoors and to the outside. The present invention relates to a light-shielding architectural base material for forming a so-called anechoic chamber that prevents leakage of electric waves. Specifically, it is a radio wave with a lightweight structure excellent in functionality, soundproofing, decoration, and heat insulation. Regarding the absorber.

[0002]

2. Description of the Related Art Conventionally, in buildings, offices, hospitals, etc. where precision electronic devices such as computers are used, from the viewpoint of preventing noise generation, malfunction, and information leakage, mutual electromagnetic waves are indoors and outdoors. There is a need for a shielding means that does not allow light to penetrate. As the electromagnetic wave shielding means, for example, a transparent conductive film is formed on a glass plate and radio waves transmitted through the electromagnetic wave shielding glass are shielded by the transparent conductive film, or a ferrite having a block structure on one surface of the conductive substrate is used. Stacked products and the like are known. Of these, the former is mainly used for building openings because it is a light-transmitting electromagnetic wave shield, and the latter is used for building walls because it is a light-shielding electromagnetic wave absorber. .

However, in the former case, since the transparent conductive film is not substantially a radio wave absorber, most of the radio waves are reflected,
Buildings around the building to which the electromagnetic wave shielding glass is attached have a problem of receiving radio interference, and are rarely actually used. On the other hand, the latter has the problems that the construction is difficult because the base is heavy, the manufacturing cost is high, and the interior / exterior material has very poor decorativeness.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional drawbacks by providing a radio wave absorber having a light transmitting property.
A base material, a magnetic material layer provided on the first base material, an electromagnetic wave reflection layer provided on the magnetic material layer, and a translucent second base material provided on the electromagnetic wave reflection layer. In this way, it is possible to provide a radio wave absorber having a lightweight structure suitable for use on the ceiling, wall surface, floor, etc. of a general building that needs to shield electromagnetic waves.

[0005]

The object of the present invention is to focus on the above reasons,
It is an object of the present invention to provide a unit type electromagnetic wave absorber which has excellent radio wave absorbing property, and also has a lightweight structure excellent in soundproofing property, decorative property, heat insulating property and the like and can be provided at low cost.

[0006]

The radio wave absorber of the present invention has a structure in which a transparent first base material, a magnetic material layer provided on the first base material, and an electromagnetic wave reflection layer provided on the magnetic material layer. The electromagnetic wave reflection layer is formed of a light-transmitting second base material provided on the electromagnetic wave reflection layer, and the electromagnetic wave reflection layer is formed of a foamable conductor, a porous conductor, a sprayed metal, and an electromagnetic wave reflection heat ray reflective film. The magnetic material layer is formed of magnetic powder mixed in the adhesive layer, and the electromagnetic wave permeable heat ray reflective film and the decorative layer are formed on the first base material.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention which has achieved such an object will be described with reference to the drawings of the following embodiments.

FIG. 1 is a schematic sectional view of a radio wave absorber according to a first embodiment of the present invention, FIG. 2 is a schematic sectional view of a radio wave absorber according to a second embodiment of the present invention, and FIG. 5 is a schematic sectional view of a radio wave absorber according to a third embodiment of the present invention, and FIG. 4 is a schematic cross sectional view of a radio wave absorber according to a fourth embodiment of the present invention.
FIG. 6 is a schematic sectional view of a radio wave absorber according to a fifth embodiment of the present invention, FIG. 6 is a schematic sectional view of a radio wave absorber according to a sixth embodiment of the present invention, and FIG. It is a schematic sectional drawing of the electromagnetic wave absorber of 7th Example.

The radio wave absorber 1 of each embodiment of the present invention is a building base material used for windows, decorative walls, etc. of general buildings, and is a translucent first group mainly made of sheet glass. A radio wave absorber having a radio wave absorption layer provided between the material 1A and the transparent second base material 1B. This radio wave absorption layer is basically composed of a magnetic material layer 2 and an electromagnetic wave reflection layer 4 provided on the magnetic material layer 2, and specifically, a translucent base material 1a, A magnetic material layer 2 provided on the base material 1a, an electromagnetic wave reflection layer 4 provided on the magnetic material layer 2, and a light-transmissive second base material 1B provided on the electromagnetic wave reflection layer 4. It is something.

The first and second translucent materials used in the present invention
Substrate 1A. 1B is transparent or translucent glass such as float glass, polished plate glass, template glass, and reinforced glass. By using these as a laminated structure with an adhesive layer or as a multilayer structure with a spacer, The functions such as soundproofing and mechanical strength such as penetration resistance are improved. On the other hand, for the magnetic material layer 2, any magnetic material such as magnetite, permalloy, ferrite or stainless can be used.

As shown in FIG. 1, a radio wave absorber 1 of the first embodiment of the present invention comprises a transparent first base material 1A and a magnetic material layer 2 provided on the first base material 1A. The electromagnetic wave reflection layer 4 provided on the magnetic material layer 2 and the light-transmissive second base material 1B provided on the electromagnetic wave reflection layer 4, and the electromagnetic wave reflection layer 4 is foamed with aluminum foam or the like. Foaming conductor 4a made of conductive metal
It was formed in.

On the other hand, the electromagnetic wave absorber of the second embodiment of the present invention is, as shown in FIG. 2, a translucent first base material 1A and a magnetic material layer 2 provided on the first base material 1A. And an electromagnetic wave reflection layer 4 provided on the magnetic material layer 2 and a transparent second base material 1B provided on the electromagnetic wave reflection layer 4, and the electromagnetic wave reflection layer 4 is made of porous carbon or the like. It is formed of the porous conductor 4b.

The foamable conductor 4a and the porous conductor 4
The b is provided with innumerable minute voids throughout, and it is possible to improve the absorption of electromagnetic waves by the magnetic material layer 2 by diffusely reflecting radio waves propagating in the voids.

The electromagnetic wave absorber of the third embodiment of the present invention is shown in FIG.
As shown in FIG. 1, a translucent first base material 1A and the first base material 1A
A magnetic material layer 2 provided on A, an electromagnetic wave reflection layer 4 provided on the magnetic material layer 2, and a translucent second base material 1B provided on the electromagnetic wave reflection layer 4, and the electromagnetic wave Al, Zn, which is obtained by low-temperature spraying the reflective layer 4 on the transparent second base material 1B,
Thermal sprayed metal 4c made of a metal such as Cu or an alloy thereof
It was formed in.

Since a fine uneven surface is formed on the surface of the sprayed metal 4c, it is possible to improve the absorbing power of electromagnetic waves by the magnetic material layer 2 as described above.

The electromagnetic wave absorber of the fourth embodiment of the present invention is shown in FIG.
As shown in FIG. 1, a translucent first base material 1A and the first base material 1A
A magnetic material layer 2 provided on A, an electromagnetic wave reflection layer 4 provided on the magnetic material layer 2, and a transparent second base material 1B provided on the electromagnetic wave reflection layer 4, Magnetic powder 2a in which the material layer 2 is mixed in an adhesive layer composed of a curable resin such as naphthol or white Portland cement
It was formed in.

In the adhesive layer, in addition to the magnetic powder 2a,
By mixing a conductive powder such as carbon powder, it is possible to improve the radio wave absorption.

The electromagnetic wave absorber of the fifth embodiment of the present invention is shown in FIG.
As shown in FIG. 1, a translucent first base material 1A and the first base material 1A
A magnetic wave absorber comprising a magnetic material layer 2 provided on A, an electromagnetic wave reflection layer 4 provided on the magnetic material layer 2, and a translucent second base material 1B provided on the electromagnetic wave reflection layer 4. The electromagnetic wave reflection layer 4 is formed of an electromagnetic wave reflection heat ray reflection film 4d provided on the side of the magnetic material layer 2 on the transparent second base material 1B.

The electromagnetic wave-reflecting heat ray reflecting film 4d is made of, for example, Cr, Ti, Ag, Au, Al, Cu, N on the surface of a synthetic resin film such as a polyester film.
i or other transparent metal or alloy, or Zn
It is possible to use a structure in which thin films of O, etc. are laminated.

The electromagnetic wave absorber of the sixth embodiment of the present invention is shown in FIG.
As shown in FIG. 1, a translucent first base material 1A and the first base material 1A
A magnetic wave absorber comprising a magnetic material layer 2 provided on A, an electromagnetic wave reflection layer 4 provided on the magnetic material layer 2, and a translucent second base material 1B provided on the electromagnetic wave reflection layer 4. , The electromagnetic wave permeable heat ray reflective film 1 on the side of the magnetic material layer 2 on the first substrate 1A.
b is formed.

The electromagnetic wave reflection layer 4 may be formed of not only the various conductors used in the above-mentioned embodiments but also a plate material having a single layer or a laminated structure of gold, silver, copper, nickel, aluminum, iron or the like. it can.

In the fifth and sixth embodiments of the present invention,
Heat ray reflective film 4d. Since it has 1b, it has extremely excellent heat insulating properties.

The electromagnetic wave absorber of the seventh embodiment of the present invention is shown in FIG.
As shown in FIG. 1, a translucent first base material 1A and the first base material 1A
A radio wave absorber comprising two magnetic material layers provided on A, an electromagnetic wave reflection layer 4 provided on the magnetic material layer 2, and a translucent second base material 1B provided on the electromagnetic wave reflection layer 4. A non-conductive decoration layer 5 is formed on the magnetic material layer 2 side on the first base material 1A.

For the decorative layer 5, a paint or a non-metal sheet material using a coloring component that does not affect electromagnetic waves is used. By forming the decorative layer 5, it is possible to camouflage the presence of the magnetic material and form the radio wave absorber 1 excellent as an interior / exterior material. The decorative layer 5 can also be formed as a heat ray reflective film as in the sixth embodiment.

[0025]

The radio wave absorber of the present invention comprises a transparent base material for the radio wave absorber, a magnetic material layer provided on the base material, and an electromagnetic wave reflection layer provided on the magnetic material layer. It is composed of a light-transmitting base material provided on the electromagnetic wave reflection layer, and the electromagnetic wave reflection layer is formed of a foaming conductor, a porous conductor, a sprayed metal, and an electromagnetic wave reflection heat ray reflection film, and further, magnetic The material layer is formed of the magnetic powder mixed in the adhesive resin layer to provide a base material having excellent radio wave absorption. Further, since the radio wave absorber of the present invention is formed as a laminated or multi-layered structure, the radio wave absorption layer is located in the middle between the base materials, so that it is durable and excellent in soundproofing. As a matter of course, since the heat ray reflective film is provided, the heat insulating property is excellent, and by using glass as the translucent base material, decorativeness can be added. Generally, the electromagnetic wave absorber of the present invention can use inexpensive and lightweight materials for each member,
Since it can be formed as an integrated unit, it provides a low-cost and easy-to-install lightweight structure electromagnetic wave absorber suitable for use on the ceiling, wall, floor, etc. of general buildings that need to shield electromagnetic waves. It is a temporary and meaningful invention.

[0026]

[Brief description of drawings]

FIG. 1 is a schematic sectional view of a radio wave absorber according to a first embodiment of the present invention.

FIG. 2 is a schematic sectional view of a radio wave absorber according to a second embodiment of the present invention.

FIG. 3 is a schematic sectional view of a radio wave absorber according to a third embodiment of the present invention.

FIG. 4 is a schematic sectional view of a radio wave absorber of a fourth embodiment of the present invention.

FIG. 5 is a schematic sectional view of a radio wave absorber of a fifth embodiment of the present invention.

FIG. 6 is a schematic sectional view of a radio wave absorber of a sixth embodiment of the present invention.

FIG. 7 is a schematic sectional view of a radio wave absorber of a seventh embodiment of the present invention.

[0027]

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Radio wave absorber 1A 1st base material 1a Electromagnetic wave transparent heat ray reflective film 1B 2nd base material 2 Magnetic material layer 2a Magnetic powder 4 Electromagnetic wave reflection layer 4a Foaming electric conductor 4b Porous electric conductor 4c Sprayed metal 4d Electromagnetic wave reflective property Heat ray reflective film 5 decorative layer

Claims (7)

[Claims] 1. A transparent first base material, a magnetic material layer provided on the first base material, and an electromagnetic wave reflection layer provided on the magnetic material layer,
A radio wave absorber comprising a second transparent base material provided on the electromagnetic wave reflection layer, and the electromagnetic wave reflection layer formed of a foaming conductor. 2. A translucent first base material, a magnetic material layer provided on the first base material, and an electromagnetic wave reflection layer provided on the magnetic material layer,
A radio wave absorber comprising a transparent second base material provided on the electromagnetic wave reflection layer, and the electromagnetic wave reflection layer formed of a porous conductor. 3. A translucent first base material, a magnetic material layer provided on the first base material, and an electromagnetic wave reflection layer provided on the magnetic material layer.
An electromagnetic wave absorber comprising a transparent second base material provided on the electromagnetic wave reflection layer, and the electromagnetic wave reflection layer formed of a sprayed metal provided on the transparent second base material. . 4. A transparent first base material, a magnetic material layer provided on the first base material, and an electromagnetic wave reflection layer provided on the magnetic material layer,
An electromagnetic wave absorber comprising a light-transmitting second base material provided on the electromagnetic wave reflection layer and formed of magnetic powder in which the magnetic material layer is mixed in an adhesive layer. 5. A transparent first base material, a magnetic material layer provided on the first base material, and an electromagnetic wave reflection layer provided on the magnetic material layer.
In a radio wave absorber made of a translucent second base material provided on the electromagnetic wave reflection layer, the electromagnetic wave reflection layer is formed of an electromagnetic wave reflective heat ray reflection film provided on the magnetic material layer side of the second base material. The electromagnetic wave absorber characterized by having done. 6. A translucent first base material, a magnetic material layer provided on the first base material, and an electromagnetic wave reflection layer provided on the magnetic material layer,
An electromagnetic wave absorber comprising a transparent second base material provided on the electromagnetic wave reflection layer, wherein an electromagnetic wave transparent heat ray reflective film is formed on the magnetic material layer side of the first base material. Radio wave absorber. 7. A transparent first base material, a magnetic material layer provided on the first base material, and an electromagnetic wave reflection layer provided on the magnetic material layer.
A radio wave absorber made of a translucent second base material provided on the electromagnetic wave reflection layer, characterized in that a non-conductive decoration layer is formed on the magnetic material layer side of the first base material. Absorber.