JPH06120691A - Method of excuting electromagnetic shielding - Google Patents

Abstract

PURPOSE:To improve a shielding effect, and to save the labor of shielding execution by simply conducting electromagnetic shielding to the clearance of an opening tie-in edge section. CONSTITUTION:Clearances are formed at any cost in an opening tie-in edge section in the opening tie-in of an air-conditioning duct 11 to the wall 10 of an electromagnetic shielding chamber, and the clearances of such an opening tie-in edge section are filled with a conductive material 1, in which a large number of conductive fibers 2 are collected coarsely and formed in a soft cottony shape. Extremely thin fiber members having a diameter of several mum- several hundred mum such as carbon fibers are favorable as the conductive fibers 2. Since the conductive materials 1 are formed in the soft cottony shape, clearances of the opening tie-in edge section of the air-conditioning dust 11, etc., can be filled with the conductive materials 1 easily.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of applying an electromagnetic shield to the interior of a building, and more particularly to an electromagnetic shield which performs an electromagnetic shield on a gap between openings, such as a door or an air conditioning duct. Regarding the construction method.

[0002]

2. Description of the Related Art There are times when it is desired to prevent electromagnetic waves from entering or conversely leaking into the interior of a building. For this reason, a conductive member such as a metal plate is used to entirely surround the interior of the building to create a so-called electromagnetic shield. It is generally done. Regarding the electromagnetic shield of buildings, for example, Japanese Patent Publication No. 2-
As disclosed in Japanese Patent No. 879 (H05K 9/00) and the like, a resistance film and a radio wave absorber are arranged inside a double wall so as to face each other, and a standing wave generated in the wall is absorbed by them. Techniques for doing so have also been proposed.

By the way, doors, air-conditioning ducts, etc. are installed in the interior of a building, and in an electromagnetic shield room,
Shielding is also required for each of these parts. For example, a metal door is used, and a conductive mesh member is arranged in an opening such as an air conditioning duct.

[0004]

However, in the arrangement of doors, air-conditioning ducts, etc., a gap is often formed at the edge of the opening, and a certain amount of gap is unavoidable in construction. If there is such a gap, the shield effect will be reduced due to the intrusion or leakage of electromagnetic waves, so it is important to construct a shield in the gap. Therefore, as shown in FIG. 6, the sealing member 20 is applied to the gap portion or conductive caulking is performed, but in any case, the work is troublesome and troublesome. It was Further, conductive caulking may cause sagging, which makes it difficult to perform the upward facing construction.

The present invention has been made in view of the above circumstances, and an object thereof is to easily perform an electromagnetic shield in a gap between opening connection edge portions, a high shield effect, and labor saving in shield construction. An object of the present invention is to provide a method for constructing an electromagnetic shield that can be realized.

[0006]

In order to achieve the above object, the present invention is directed to a shield room in which conductive members are arranged on each surface of a wall and a floor or a ceiling for electromagnetic shielding, a door, an air conditioning duct, etc. Is characterized in that a large number of conductive fibers are roughly aggregated and filled with a flexible cotton-like conductive material in the gap between the opening connection edge portions.

[0007]

The operation of the present invention will be described in such a manner that a conductive material formed into a flexible cotton-like conductive material by roughly gathering a large number of conductive fibers is filled in a gap between the opening joint edge portions of a door, an air conditioning duct or the like. Since the conductive material is formed into a flexible cotton shape, it is possible to easily fill the gaps in the opening connection edge portions of the door, the air-conditioning duct, and the like.

[0008]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a perspective view showing a preferred embodiment of the present invention. The figure shows the main part of the wall surface of the electromagnetic shield room.

A conductive plate material (not shown) is embedded in the wall 10 of the electromagnetic shield chamber and shielded. In addition, the air-conditioning duct 1 that penetrates through the wall 10
The inside of 1 is provided with an electromagnetic shield (not shown).

In the opening joint of the air-conditioning duct 11 to the wall 10, it is unavoidable that a gap is created in the opening joint edge as described above. Therefore, as a construction method of the present invention, the gap in the opening joint edge is flexible. The conductive material 1 shaped like cotton is filled.

This conductive material 1 is made of an extremely thin fiber member, and as shown in FIG. 2, a large number of conductive fibers 2 are roughly gathered and formed into a soft cotton shape. The conductive fiber 2 is a carbon fiber in this embodiment, and the conductive material 1 has a thickness of 7 mm. FIG. 3 is a graph showing attenuation characteristics as an electromagnetic shield. As shown in FIG. 3, 70 to 30 dB at 5 to 30 MHz corresponding to the HF band.
About 100-1000M from VHF band to UHF band
At Hz, an attenuation of about 40 to 100 dB was obtained.

The conductive fiber 2 has a diameter of several μm.
An ultrafine fiber member having a thickness of up to several 100 μm is preferable, and as long as it is a fiber member having conductivity, it is not limited to carbon fiber and may be metal fiber such as stainless steel.

On the other hand, in the opening / closing portion of the door or the like, as shown in FIG. 4, the conductive material 1 is filled in the gap between the door 12 and the door frame 13. That is, the conductive material 1 is attached to the abutting portion 14 on the door frame 13 side, and since the conductive material 1 is flexible and elastic like cotton, it is convenient for shield construction of a gap portion that needs to be opened and closed. Is good. FIG. 5 is a graph showing the damping characteristics when the conductive material 1 is attached to the door frame 13 side and when it is not attached. As shown in FIG. 5, the conductive material 1 is attached to the door frame 13 side. Has a higher attenuation and a higher shielding effect, and 40 to 30MHz to 1000MHz
An attenuation of about 60 dB was obtained.

As described above, the conductive material 1 is a material in which a large number of conductive fibers are roughly gathered and formed into a flexible cotton shape, and therefore, the opening mating edges of the door 12, the air conditioning duct 11, etc. The gap can be easily filled, and the electromagnetic shield can be easily provided in the gap of the opening connection edge portion. Since the conductive material 1 is a molding material made of the conductive fiber 2, it has a high shielding effect and is formed into a flexible cotton shape, so that it can be applied regardless of the shape of the gap and has excellent handleability. Labor saving can be achieved in shield construction.

Since a large number of conductive fibers 2 are roughly aggregated as the conductive material 1, a large number of voids are inevitably formed, which is expected to have a considerable effect on heat insulation and sound insulation. In addition, since the conductive material 1 is flexible and elastic like cotton, it is also advantageous for vibration and thermal deformation.
Therefore, it can be used as a substitute for a heat insulating / sound-insulating material such as glass wool, and it is possible to obtain a good performance in heat insulating property and sound insulating property together with the effect of the electromagnetic shield, which is preferable for labor saving and labor saving in construction.

[0016]

As described in detail above, according to the electromagnetic shield construction method of the present invention, a large number of conductive fibers are roughly gathered in the gaps of the opening joint edge portions of doors, air-conditioning ducts, etc. to be flexible. It is filled with a conductive material that is shaped like cotton, and since the conductive material is molded into a flexible cotton shape, it is possible to easily fill the gaps in the opening edge of the door, air-conditioning duct, etc. . Therefore, electromagnetic shielding can be easily performed on the gap between the opening connection edge portions, and since the conductive material is a molding material made of conductive fibers, the shielding effect is high,
Since it is formed in a flexible cotton shape, it can be installed regardless of the shape of the gap and is excellent in handleability, and as a result, labor saving can be achieved in shield installation.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a perspective view showing a conductive material.

FIG. 3 is a graph showing attenuation characteristics as an electromagnetic shield.

FIG. 4 is a cross-sectional view of essential parts showing a shield construction example of a door portion.

FIG. 5 is a graph showing damping characteristics regarding shield construction of a door portion.

FIG. 6 is a perspective view illustrating a conventional example of shield construction.

[Explanation of symbols]

 1 Conductive Material 2 Conductive Fiber 10 Wall 11 Air Conditioning Duct 12 Door

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] November 13, 1992

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 5

[Correction method] Change

[Correction content]

[Figure 5]

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masanori Matsuyama 4-1-2, Hirano-cho, Chuo-ku, Osaka-shi, Osaka Within Osaka Gas Co., Ltd. (72) Inventor Katsuo Yoshida 4-640, Shimoseito, Kiyose-shi, Tokyo Stocks Obayashi Corporation Technical Research Institute (72) Inventor Masao Ishigashi 4-640 Shimoseito, Kiyose-shi, Tokyo Inside Obayashi Technical Research Institute Ltd. (72) Inventor Haruka Ogawa 4-640, Shimoseido, Kiyose-shi Tokyo Metropolitan Institute of Technology (72) Inventor Toru Okui 4-33 Kitahama East, Chuo-ku, Osaka City, Osaka Prefecture Obayashi Corporation Head Office

Claims (1)

[Claims] 1. A large number of conductive fibers are provided in a gap between openings, such as doors and air-conditioning ducts, in a shield room where conductive members are arranged on walls, floors, and ceilings for electromagnetic shielding. A method for constructing an electromagnetic shield, characterized in that the conductive material formed by roughly gathering and forming a flexible cotton-like material is filled.