JPH1174679A - Electromagnetic shielding at switch/receptacle box attaching wall part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent drop of shielding level near a switch/receptacle box attaching wall part. SOLUTION: Relating to electromagnetic shielding at a switch receptacle box attaching wall part in electromagnetic shielding space wherein an electromagnetic shielding layer is formed with an electromagnetic shielding material at a wall, floor, ceiling, and roof, a gap between a switch/receptacle box 3 and an attaching hole 2 of a wall 1 and inside of the switch/receptacle box 3 are covered with an electromagnetic shielding material, the electromagnetic shielding material 6 is connected to an electromagnetic shielding material 5 on a wall surface for an electrically integrated electromagnetic shielding layer, and covering is performed with the electromagnetic shielding material from the gap against the attaching hole of the wall to inner periphery for a switch/ receptacle box of iron plate, while covering with the electromagnetic shielding material is performed from the gap against the attaching hole of the wall to the entire inside surface for a switch/receptacle box of resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic shield for a switch / outlet box mounting wall in a shielded space in which an electromagnetic shield layer is formed on a wall, floor, ceiling, or roof using an electromagnetic shield.

[0002]

2. Description of the Related Art In order to prevent use radio waves from leaking from the inside of a building to the outside, and to prevent external radio waves from entering the inside of a building as noise radio waves, electromagnetic shielding materials are used on walls, ceilings and floors. Various proposals have been made with respect to a technique of forming a used electromagnetic shielding layer to make an electromagnetic shielding space inside a building.

In the electromagnetic shielding structure proposed so far, an electromagnetic shielding material is used for a building frame, a floor slab, and a wall structure, and a special electromagnetic shielding glass or a door is also provided for a window opening or a door opening. Used to achieve the desired level of electromagnetic shielding.
In addition, as an electromagnetic shielding material for forming the electromagnetic shielding layer, a conductive material such as a conductive metal mesh, a metal foil, a metal film, a nonwoven fabric, a sheet using conductive fibers, and a conductive paint is used. .

[0004]

However, with the spread of portable telephones and PHS (Personal Handy Phone System) and other wireless communications, the frequency band of radio waves used increases, and the conventional electromagnetic shielding structure requires a desired shielding level. The problem that cannot be achieved has arisen. Wireless telephones and the like have been required to cope with a high frequency band of 30 MHz to 3 GHz. When the frequency band is increased and the wavelength is shortened, a small gap which has not been a problem until now has been required. However, radio wave leakage occurred, and the reduction in the shielding level became noticeable.

[0005] In a radio telephone such as a portable telephone and a PHS, if a predetermined shielding level cannot be achieved in a theater, a hall, or a studio for performing public live broadcasting and recording in the case of broadcasting, a telephone carried by ordinary visitors is required. The ringing bell sounds and the atmosphere is destroyed or the recording quality is reduced. Even if a general visitor is warned in advance to turn off the power at the time of admission, it cannot be thoroughly performed among a large number of visitors, and it is difficult to avoid such a situation.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to prevent a shield level from being lowered near a switch / outlet box mounting wall.

Therefore, the present invention relates to an electromagnetic shield for a switch / outlet box mounting wall portion of an electromagnetic shield space in which an electromagnetic shield layer is formed on walls, floors, ceilings, and roofs using an electromagnetic shield material.・ The gap between the outlet box and the mounting hole on the wall and the inside of the switch / outlet box are covered with an electromagnetic shielding material, and the electromagnetic shielding material is connected to the electromagnetic shielding material on the wall surface to electrically integrate the electromagnetic shielding layer. For switchboards and outlet boxes made of iron plate, the inside periphery is covered with electromagnetic shielding from the gap between the mounting holes on the wall, and for switch and outlet boxes made of resin, the wall is mounted. The entirety of the inside from the gap with the hole is covered with an electromagnetic shielding material.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a switch according to the present invention.
It is a figure which shows the embodiment of the electromagnetic shielding of an outlet box mounting wall part, 1 is a wall, 2 is a mounting hole, 3 is a switch / outlet box, 4 is a mounting tool, 5 and 6 are shielding materials, 7 is a tapping screw. Is shown.

In FIG. 1, a wall 1 is made of, for example, a finishing board or the like, which is not shown, but is mounted on a frame as a base, and a switch / outlet box 3 is an iron plate for embedding and mounting a wall switch or an outlet on the wall. Box. The mounting hole 2 is an opening provided on the front of the wall 1 for mounting the switch / outlet box 3. The attachment 4 is a metal fitting arranged on the back side of the wall 1 for attaching and fixing the switch / outlet box 3 to the attachment hole 2. The shielding members 5 and 6 are electromagnetic shielding members made of a conductive material such as a conductive metal mesh, a metal foil, a metal film, a nonwoven fabric, a sheet using conductive fibers, and a conductive paint. The shield material 6 covers the gap between the switch / outlet box 3 and the mounting hole 2 of the wall 1 and the inside of the switch / outlet box 3. The tapping screw 7 has a shielding material 5
6 is for fixing to the wall 1.

Normally, the diameter of the mounting hole 2 in the wall 1 is slightly larger than the outer diameter of the switch / outlet box 3. This is for facilitating the work of attaching the switch and outlet box 3. Therefore, a slight gap is formed around the mounting hole 2 and the switch / outlet box 3 attached thereto. Conventionally, even if there is such a gap, a desired electromagnetic shielding level can be realized by covering the wall 1 with the shielding material 5 and attaching the switch / outlet box 3 made of iron plate. However, as described above, when it is required to cope with a frequency band as high as 3 GHz, a desired shielding level cannot be realized even with such a small gap. The shield member 6 covers this gap, and electrically connects the shield member of the wall 1 and the iron plate of the switch / outlet box 3 electrically and integrally.
Even if the switch / outlet box 3 is mounted on the wall 1, a continuous shielding surface is formed to prevent a gap from causing radio wave leakage.

FIG. 2 is a view showing another embodiment of the electromagnetic shielding of the switch / outlet box mounting wall according to the present invention, wherein 11 is a wall, 12 is a mounting hole, 13 is a switch / outlet box, and 14 is a switch / outlet box. Fittings, 15, 16
Denotes a shield material, and 17 denotes a tapping screw.

When the switch / outlet box is made of iron plate, as shown in FIG. 1, the inner periphery is covered with the shield material 6 from the gap with the mounting hole 2 of the wall, and substantially only the gap is covered. Should be used, but when resin is used for the switch and outlet box,
Since the switch and outlet box 13 itself shown in FIG. 2 does not have electromagnetic shielding performance, the entire surface of the mounting hole 2 is subject to radio wave leakage. Therefore, in the case of the switch / outlet box 13 made of resin as shown in FIG. 2, the entire inner surface including the bottom surface from the gap with the mounting hole 12 of the wall 11 is covered with the shield material 16.

Note that the present invention is not limited to the above-described embodiment, and various modifications are possible. For example, in the above-described embodiment, the surface of the wall is covered with the shield material. However, the wall may be formed by covering the back surface with the shield material or forming the shield layer using a conductive material for the wall itself. .

[0014]

As is apparent from the above description, according to the present invention, the gap between the switch / outlet box and the mounting hole in the wall and the inside of the switch / outlet box are covered with the electromagnetic shielding material. Is connected to the electromagnetic shielding material on the wall surface to electrically integrate the electromagnetic shielding layer, so that a reduction in the shielding level near the switch / outlet box mounting wall portion can be prevented. In addition, since the inside of the switch / outlet box is covered with the electromagnetic shielding material, the operation can be performed after the switch / outlet box is attached.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of electromagnetic shielding of a switch / outlet box mounting wall portion according to the present invention.

FIG. 2 is a view showing another embodiment of the electromagnetic shielding of the switch / outlet box mounting wall portion according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Wall, 2 ... Mounting hole, 3 ... Switch / outlet box, 4 ... Mounting tool, 5, 6 ... Shielding material, 7 ... Tapping screw

Claims (3)

[Claims] An electromagnetic shield for a switch / outlet box mounting wall portion of a shielded space in which an electromagnetic shield layer is formed on a wall, floor, ceiling, or roof using an electromagnetic shield material, wherein the switch / outlet box and the wall are provided. A switch characterized in that the gap between the mounting hole and the inside of the switch / outlet box is covered with an electromagnetic shielding material, and the electromagnetic shielding material is connected to the electromagnetic shielding material on the wall surface to electrically integrate the electromagnetic shielding layer.・
Electromagnetic shielding of the wall of the outlet box. 2. The switch / outlet box mounting according to claim 1, wherein an inner periphery of the switch / outlet box made of an iron plate is covered with an electromagnetic shielding material from a gap between the mounting hole and the wall. Electromagnetic shielding of walls. 3. The switch / outlet box mounting according to claim 1, wherein an inner surface of the switch / outlet box made of resin is covered with an electromagnetic shielding material through a gap between the wall and the mounting hole. Electromagnetic shielding of walls.