JP2000179068A - Anechoic chamber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an anechoic chamber of a high electromagnetic shielding property. SOLUTION: This anechoic chamber 2 built in the inner space 2 of the building frame 1 of a building is constituted of a plurality of inner facing building materials having conductivity such as an electromagnetic shielding ceiling 4, electromagnetic shielding side walls 5, and electromagnetic shielding floor 6. In this case, at least one of a plurality of the inner facing building materials constituting the anechoic chamber is formed so that a plurality gypsum boards including electromagnetic shielding material are piled on the outside and the inside, the outside gypsum boards and the inside gypsum boards are arranged so as to shift longitudinally and laterally from each other, the peripheral edges of the outside gypsum boards are connected to each other through conductive members, and the peripheral edges of the inside gypsum boards are connected to each other through conductive members. Meanwhile, at the butt parts of a plurality of the inner facing building materials, a plurality of the inner facing building materials are connected to each other through conductive connecting members bendingly formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anechoic chamber for preventing electromagnetic waves from entering a building from inside to outside and preventing leakage of electromagnetic waves from inside a building to the outside.

[0002]

2. Description of the Related Art With the advent of a highly information-oriented society, such as the spread of mobile phones and the spread of LAN communication systems in intelligent buildings and hospitals, the deterioration of living environments due to electromagnetic waves has become a problem. For example, Japanese Patent Publication No. 3-62320 discloses that two boards of the same shape are vertically and horizontally shifted by a predetermined distance and bonded to each other, and the bonding surfaces thereof are formed by a conductive film. BACKGROUND ART Interior building materials such as ceilings and floors that prevent the entry of electromagnetic waves and prevent the leakage of electromagnetic waves from inside a building to the outside are disclosed.

[0003]

However, the conventional interior building material has a structure in which two plates are bonded together with a conductive film interposed therebetween. In some cases, a gap may be formed in the abutting portion between a plurality of interior building materials. When such a gap is formed, there is a possibility that an electromagnetic wave may enter or leak from the gap.

Accordingly, an object of the present invention is to provide an electromagnetic wave anechoic chamber having high electromagnetic shielding properties.

[0005]

According to the first aspect of the present invention, an electromagnetic wave is prevented from entering the building from the outside to the inside, or the leakage of the electromagnetic wave from the building to the outside is prevented. An anechoic chamber constructed of a plurality of conductive interior building materials such as an electromagnetic shielding ceiling, an electromagnetic shielding floor, and an electromagnetic shielding side wall in an internal space of a building frame, wherein at least one of the plurality of interior building materials is A plurality of gypsum boards containing an electromagnetic shielding material are superimposed on the outside and the inside, and the outside gypsum board and the inside gypsum board are arranged vertically and horizontally,
The outer edges of the gypsum board are connected to each other by a conductive member, and the edges of the inner gypsum board are connected to each other by a conductive member. It is characterized in that a plurality of interior building materials are connected to each other by a connection member having a property. The invention of claim 2 is characterized in that a recess is formed at the butting portion between the peripheral edges of the gypsum board according to claim 1, and the recess is filled with a conductive putty.
In the invention of claim 3, the gypsum board according to claim 1 embeds a conductive mesh in a gypsum layer obtained by mixing a fibrous or granular conductive material, and forms a peripheral edge of the gypsum layer with a conductive material. It is characterized by being covered with a conductive border connected to a mesh.

[0006]

1 to 8 show a first embodiment of the present invention. FIG. 1 shows a cross section of an anechoic chamber 1 cut in a vertical direction, and FIG. FIG. 2 shows a plane
Fig. B shows a cross section of Fig. 2a cut along the line FF, Fig. 3 shows the interior building material 9 forming the electromagnetic shielding ceiling 4 and the electromagnetic shielding floor 6 viewed from the indoor side, and Fig. 4 shows FIG. 5 shows one connection structure between the gypsum boards 8 in the portion A of FIG.
6 shows another connection structure between the gypsum boards 8 in the B portion, FIG. 6 shows a connection structure between the electromagnetic shielding ceiling 4 and the electromagnetic shielding side wall 5 in the C portion in FIG. 1, and FIG. 8 shows a connection structure between the electromagnetic shielding side wall 5 and the finish ceiling 7, and FIG.
3 shows a connection structure between the electromagnetic shielding side wall 5 and the electromagnetic shielding floor 6 at the portion E of FIG.

The anechoic chamber 3 will be described with reference to FIG. The anechoic chamber 3 uses a plurality of conductive building materials such as an electromagnetic shielding ceiling 4, an electromagnetic shielding side wall 5, and an electromagnetic shielding floor 6 to form an inner space 2 of a skeleton 1 made of reinforced concrete of a building, and from the outside of the building. The building is constructed to prevent electromagnetic waves from entering the inside and to prevent leakage of electromagnetic waves from the inside of the building to the outside. The ceiling of the anechoic chamber 3 has a double structure including an electromagnetic shielding ceiling 4 and a normal finishing ceiling 7, and forms a suspended ceiling or a freestanding ceiling with respect to the frame 1.

With reference to FIG. 2, a gypsum board 8 used as an interior building material as the electromagnetic shielding ceiling 4 and the electromagnetic shielding side wall 5 will be described. In the gypsum board 8, a gypsum layer 8b in which a fibrous or granular conductive material 8a is mixed embeds a conductive mesh 8c, and both sides of the gypsum layer 8b are board paper 8d.
The peripheral portion of the gypsum board 8 has a conductive edge 8e such as a metal tape or a conductive film as a connecting member.
It is covered with. The conductive mesh 8c and the conductive border 8e are connected to each other. Thus, the gypsum board 8 is lightweight, non-combustible, and has high electromagnetic shielding properties.
Further, an interior building material as the electromagnetic shielding side wall 5 can be formed.

FIG. 3 shows an electromagnetic shielding ceiling 4 and an electromagnetic shielding side wall 5.
The interior building material 9 will be described. Interior building materials 9
A plurality of gypsum boards 8 including an electromagnetic shielding material are superposed on the outside and the inside, and the outer gypsum board 8 and the inner gypsum board 8 are arranged to be shifted vertically and horizontally to form an outer gypsum board group. An abutting portion between the plurality of gypsum boards 8 and an abutting portion between the plurality of gypsum boards 8 constituting the inner gypsum board group are formed so as not to be at the same position on the outside and the inside. In FIG. 3, a solid line L
Reference numeral 1 denotes an abutting line between the inner gypsum boards 8, and a dotted line L2 in FIG. 3 denotes an abutting line between the outer gypsum boards 8.

Referring to FIG. 4, one connection structure between the inner gypsum boards 8 in the interior member 9 will be described.
In this connection structure, connection fittings 10 and 1 as conductive connection members are provided at the butted portions of the inner gypsum boards 8.
1 are superimposed. The connection fittings 10 and 11 are formed in a band shape extending along the butting line L1 shown in FIG. 3, and in a portion where the vertical connection fitting 10 and the horizontal connection fitting 11 overlap, one of the connection fittings 11 is the other. Over the connection fitting 10. Then, in a state before one connection fitting 11 is overlapped, a metal screw 12 such as a tapping screw passes through the conductive border 8 e of the gypsum board 8 inside the other connection fitting 10 and the inside gypsum layer 8 b. By being fastened to the outer gypsum board 8, the inner gypsum board 8 is connected to each other by the metal screw 12, the conductive rim 8 e and the connection fitting 10. The inner and outer gypsum boards 8 are connected to each other by the metal screws 12 and the conductive material 8a (see FIG. 2B) in the gypsum layer 8b. The outer gypsum board 8 has a light steel support 1
3 is backed.

Referring to FIG. 5, another connection structure between the inner gypsum boards 8 in the interior member 9 will be described. At the butting portion corresponding to the butting line L1 on the inner gypsum board 8, a groove-shaped concave portion 15 is formed over the ends of both gypsum boards 8 and the gypsum layer 8b of the outer gypsum board 8. The recess 15 is filled with the conductive putty 16 and solidified, so that the inner and outer gypsum boards 8 are connected to each other.

Referring to FIG. 6, a connection structure between the electromagnetic shielding ceiling 4 and the electromagnetic shielding side wall 5 will be described. In this joining structure, the connecting fittings 17 and 18 as connecting members are provided in the wall rising direction and the horizontal direction, and the outer connecting fitting 17 is connected to the frame 1.
And the lightweight steel frame supporters 21 and 20 arranged on the side of the upper slab 1c (see FIG. 1) and the lightweight steel frame support 21 arranged on the side slab 1b (see FIG. 1) of the skeleton 1. Have been combined. The electromagnetic shielding side wall 5 is superimposed on the wall rising portion and the horizontal portion of the connection metal 17, and the electromagnetic shielding ceiling 4 is superimposed on the horizontal portion of the connection metal 17 while abutting the electromagnetic shielding side wall 5. Then, a metal screw 22 such as a tapping screw is connected to the outside of the electromagnetic shielding ceiling 4 from the horizontal portion of the inner connection fitting 18 via the conductive border 8e of the inner gypsum board 8 and the gypsum layer 8b in the electromagnetic shielding ceiling 4. And a metal screw 23 such as a tapping screw on the inner side of the electromagnetic shielding side wall 5 from the wall rising portion of the inner connection fitting 18 superimposed on the electromagnetic shielding ceiling 4 and the electromagnetic shielding side wall 5. Gypsum board 8
Is fastened to the gypsum board 8 outside the electromagnetic shielding side wall 5 via the conductive rim 8e and the gypsum layer 8b.
The electromagnetic shielding ceiling 4 and the electromagnetic shielding side wall 5 are made of metal screws 22 and 2.
3, the conductive border 8 e and the connection fitting 18.

Referring to FIG. 7, a connection structure between the electromagnetic shielding side wall 5 and the finish ceiling 7 will be described. In this joint structure,
At the butting portion of the inner gypsum board 8 on the electromagnetic shielding side wall 5, a connection fitting 25 as a conductive connection member is provided.
Are superimposed. The connection fitting 25 is formed in a band shape extending along the butting line L1 shown in FIG. Then, a metal screw 26 such as a tapping screw is attached to the connection fitting 25 by a lightweight steel support 27 via the connection fitting 25 and the conductive fringe 8e of the inner gypsum board 8 and the inner gypsum layer 8b. As a result, the inner and outer gypsum boards 8 are connected to each other by the metal screws 26, the conductive rim 8 e, and the connection fittings 25. The finished ceiling 7 is positioned by being abutted against the support 27 from the inside. The outer gypsum board 8 is lined with a support 28 made of a lightweight steel frame.

Referring to FIG. 8, a connection structure between the electromagnetic shielding side wall 5 and the electromagnetic shielding floor 6 will be described. In this joint structure, connection fittings 30 and 31 as connection members are provided in the wall rising direction and the horizontal direction, and the outer connection fitting 30 is connected to the frame 1.
32 made of lightweight steel fixed to the lower slab 1c
And the lower slab 1c. The electromagnetic shielding side wall 5 is provided at the wall rising portion and the horizontal portion of the connection fitting 30.
Are superimposed, and the inner connection fitting 31 is overlapped on the horizontal portion of the electromagnetic shielding side wall 5 and the connection fitting 30, so that the electromagnetic shielding side wall 5 has connection fittings 30, 3 between the inside and the outside.
It is sandwiched by 1. Then, a metal screw 33 such as a tapping screw is connected to the electromagnetic shield side wall 5 via the conductive edge 8 e of the inner gypsum board 8 and the gypsum layer 8 b in the electromagnetic shield side wall 5 from the wall rising portion of the inner connection fitting 31.
Is fastened to the gypsum board 8 outside. The electromagnetic shielding floor 6 is formed of conductive rubber and is overlapped on the horizontal portion of the connection fitting 31 on the inner side while being abutted against the electromagnetic shielding side wall 5. Then, the electromagnetic shielding floor 6 and the connection fittings 30 and 3 are provided by the thin connecting fitting 35 on the inside where the metal screw 34 such as a tapping screw is superimposed on the electromagnetic shielding floor 6.
By being fastened to the lower slab 1c via 1
The electromagnetic shielding side wall 5 and the electromagnetic shielding floor 6 are made of metal screws 33, 34.
, Conductive border 8e, connection fittings 30, 31 and connection fitting 3
5. 36 is a finishing floor laid on the electromagnetic shielding floor 6, and 37 is a finishing skirting board applied to the electromagnetic shielding side wall 5.

According to the structure of this embodiment, the connection metal fittings 17 and 1 as conductive connection members in which the electromagnetic shielding ceiling 4, the electromagnetic shielding side walls 5 and the electromagnetic shielding floor 6 are formed to be bent.
8, 30, 31 are connected by the anechoic chamber 3
Shielded ceiling 4 and electromagnetically shielded side wall 5 electrically connected to each other
The electromagnetic wave anechoic chamber 3, which is formed by six surfaces including the electromagnetic shielding floor 6 and has high electromagnetic shielding properties, can be obtained.

Further, a plurality of gypsum boards 8 superposed on the inner side and the outer side including the electromagnetic shielding material are vertically and horizontally shifted, and the conductive fringes 8e of the upper gypsum board 8 are connected to each other, and Since the conductive edgings 8e as the conductive connecting members of the gypsum board 8 on the side are connected to each other, the interior building material 9 constituting the electromagnetic shielding ceiling 4 and the electromagnetic shielding side wall 5 is in a state where there is no gap as a whole. It has conductivity, is lightweight, is nonflammable, and can exhibit good electromagnetic shielding properties.

In the above embodiment, the electromagnetic shielding ceiling 4, the electromagnetic shielding side wall 5, and the electromagnetic shielding floor 6 are connected to each other, so that the anechoic chamber 3 is formed inside the frame 1.
It goes without saying that an earth wire (not shown) is buried in the construction ground where the frame 1 is constructed from any one of the electromagnetic shielding ceiling 4, the electromagnetic shielding side wall 5, and the electromagnetic shielding floor 6, and is installed.

The gypsum board 8 has a conductive border 8e on the entire periphery.
Gypsum board 8 with metal screws 12, 22, 2
In the case where the plurality of gypsum boards 8 can be electrically connected to each other by fastening with 3, 33, 34, the conductive border 8e does not have to be provided on the periphery of the gypsum board 8 in that portion.

[0019]

As described above, according to the first aspect of the present invention,
Since a plurality of conductive interior building materials, such as an electromagnetic shielding ceiling, an electromagnetic shielding side wall, and an electromagnetic shielding floor, are connected by a conductive connecting member that is formed by bending, the anechoic chamber is electrically connected to the plurality of electromagnetic anechoic chambers. An anechoic chamber formed of six surfaces made of interior building materials and having high electromagnetic shielding properties can be obtained.
In addition, at least one of the plurality of interior building materials has a plurality of gypsum boards including an electromagnetic shielding material overlapped on the outside and the inside, and the outer gypsum board and the inner gypsum board are vertically and horizontally shifted. Since the peripheral edges of the outer gypsum board were connected to each other by the conductive member and the peripheral edges of the inner gypsum board were connected to each other by the conductive member, the electromagnetic shielding ceiling was electrically conductive without any gap. It is lightweight, nonflammable and can exhibit good electromagnetic shielding properties. According to the second aspect of the present invention, since the concave portion is formed at the butted portion between the peripheral edges of the gypsum board, and the concave portion is filled with the conductive putty, the butted portion can be flattened and the appearance can be improved. According to the invention of claim 3, the gypsum board has a conductive mesh embedded in a gypsum layer in which a fibrous or granular conductive material is mixed, and a peripheral edge of the gypsum layer is connected to the conductive mesh. , The interior building material can be further reduced in weight.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an anechoic chamber according to an embodiment of the present invention.

FIG. 2 shows the gypsum board of the embodiment, wherein FIG. 2A is a plan view and FIG. 2B is a sectional view taken along line FF of FIG.

FIG. 3 is a plan view showing the interior building material of the embodiment.

FIG. 4 is a cross-sectional view showing a connection structure between gypsum boards in a portion A of FIG. 3;

FIG. 5 is a sectional view showing a connection structure between gypsum boards in a B part of FIG. 3;

FIG. 6 is a cross-sectional view showing a connection structure of a portion C in FIG. 1;

FIG. 7 is a sectional view showing a connection structure of a portion D in FIG. 1;

FIG. 8 is a sectional view showing a connection structure of a portion E in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Frame 2 Internal space 3 Anechoic chamber 4 Electromagnetic shielding ceiling 5 Electromagnetic shielding side wall 6 Electromagnetic shielding floor 7 Finish ceiling 8 Gypsum board 8a Conductive material 8b Gypsum layer 8c Conductive mesh 8e Conductive border 8d Board paper

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Tetsuo Endo 2-1 Tsukudo-cho, Shinjuku-ku, Tokyo Headquarters, Kumagaya Gumi Tokyo headquarters (72) Inventor Seiichi Fujimori Inventor Yuichiro Nakamura 510-1 Nakatsu, Aikawa-cho, Aiko-gun, Kanagawa

Claims (3)

[Claims] An electromagnetic shielding ceiling and an electromagnetic shielding are provided in an internal space of a building body so as to prevent an electromagnetic wave from entering the inside from the outside of the building or to prevent leakage of the electromagnetic wave from the inside of the building to the outside. An anechoic chamber constructed of a plurality of conductive interior building materials such as a floor and an electromagnetic shielding side wall, wherein at least one of the plurality of interior building materials has a plurality of gypsum boards including an electromagnetic shielding material on an outer side and an inner side. The outer gypsum board and the inner gypsum board are displaced vertically and horizontally, the edges of the outer gypsum board are connected to each other by a conductive member, and the edges of the inner gypsum board are conductive. An anechoic chamber, wherein the interior building materials are connected to each other by a conductive connecting member that is bent and formed at a butt portion between the plurality of interior building materials while being connected to each other by a member. 2. The anechoic chamber according to claim 1, wherein a concave portion is formed at the butting portion between the peripheral edges of the gypsum board, and the concave portion is filled with a conductive putty. 3. A gypsum board, in which a conductive mesh is embedded in a gypsum layer in which a fibrous or granular conductive material is mixed, and a periphery of the gypsum layer is covered with a conductive border connected to the conductive mesh. 2. The anechoic chamber according to claim 1, wherein: