JP2552396B2 - Electromagnetic wave shielding structure - Google Patents

Description

TECHNICAL FIELD The present invention relates to an electromagnetic wave shield structure.

[Conventional technology]

In general, the electromagnetic wave shield structure is designed to surround the room so that harmful radio waves do not enter from the outside and electromagnetic waves generated from electromagnetic devices used indoors do not leak to the outside as harmful radio waves. An electromagnetic wave shield member such as a steel plate or a copper plate is attached over the entire surface of a wall, a ceiling or the like. In addition, a dedicated electromagnetic shield door is attached to the entrance and exit, and it is a double door.

[Problems to be Solved by the Invention]

However, in this electromagnetic wave shield door, since the door and the door frame are electrically joined to each other with the contact piece interposed so that the electromagnetic wave can be completely shielded, it is necessary to push the door into the door frame.

Therefore, when entering and exiting, it is necessary to perform operations such as locking the door one by one, and when entering and exiting frequently, it is troublesome, and high accuracy is required for the door and door frame. To be done.

Furthermore, in order to shield the electromagnetic waves at all times, it is necessary that one side is always closed as a double door.

By the way, it is generally known that radio broadcasts may not be heard when a subway car or a running car enters a tunnel.

The present invention has been proposed in order to solve the above-mentioned conventional problems. By utilizing the property of electromagnetic waves in a tunnel, the electromagnetic waves at the entrance and exit can be completely shielded even without a door. The purpose of the building is to provide a doorway for the building that allows for smooth entrance and exit.

[Means for solving the problem]

In order to achieve the above-mentioned object, the electromagnetic wave shield structure according to the present invention is provided with an entrance / exit in the electromagnetic wave shield structure, and a stepped passage of a predetermined length is formed inside the entrance / exit in a tunnel shape inside the structure. At the same time, the inner end of the passage is branched to the left and right, and the periphery of the passage is covered with an electromagnetic wave shield member.

The length L of the passage may be equal to or greater than the ceiling height H or the width W of the passage, whichever is larger.

The length L of the passage is such that the ceiling height H of the passage is the same even if the inner or outer surface of the passage is only the electromagnetic wave shield member.
Alternatively, 6 times the width W, whichever is larger, is sufficient, and the magnification can be reduced by mounting the electromagnetic wave absorber alone or in combination on the electromagnetic wave shield member.

〔Example〕

Hereinafter, an electromagnetic wave shield structure according to the present invention will be described based on an illustrated embodiment.

Fig. 1 is a plan view of the ground floor of an electromagnetic wave shield structure. Its roof and outer walls are equipped with electromagnetic wave shield members such as steel plates and copper plates so as to surround the entire building, completely shielding electromagnetic waves. It has a structure that allows it. In addition, an entrance / exit 1 for mainly entering and exiting outside is provided in the front part, and a plurality of elevators 2, stairs 3, emergency exits 4 and the like are installed depending on the scale of the building.

A hall 5 is provided inside the doorway 1 so that it is easy to go in and out, and a passage 6 leading to the elevator hall and the staircase is provided in a slender tunnel shape following the hall 5.

The floor, ceiling and left and right walls of the hall 5 and the passage 6 are completely covered with a metal plate such as a steel plate or a copper plate, a dielectric material 8 such as expanded polystyrene containing carbon, or an electromagnetic wave absorber such as a ferrite tile 9 or a combination thereof. Therefore, the structure is such that electromagnetic waves can be completely shielded (see FIG. 5).

If the length L of the passage 6 is longer, the electromagnetic wave can be shielded more completely, but the electromagnetic wave shield member 7 alone can increase the ceiling height H.
Alternatively, it has been found that the electromagnetic wave can be completely shielded by setting the width W to be at least about 6 times the larger one.

Moreover, the cross-sectional shape of the passage 6 does not necessarily have to be rectangular, and may be circular, elliptical, or arched at the ceiling. Further, a plurality of step portions may be attached to the left and right side walls 6a, 6a of the passage 6 so as to become gradually narrower toward the back.

Further, an effective dielectric is preferably uneven, but it can be made flat by combining it with an object that allows electromagnetic waves to pass therethrough, for example, a foam 10 such as styrofoam (see FIG. 6).

〔The invention's effect〕

Since the present invention is configured as described above, it has the following effects.

Since no door is required, you can enter and exit smoothly.
It is especially effective at the entrances and exits of buildings with heavy traffic.

In addition, since the door is not required, all the parts required for mounting the door are not required, and the shield structure between the door and the door frame is not required at all, so the structure of the entrance / exit is extremely simple. Can be

Furthermore, not only the surroundings of the passage, that is, the floor, the ceiling, and the walls are covered with the electromagnetic wave shield member, but also the shield member is completely covered with an electromagnetic wave absorber such as a dielectric or a ferrite tile to shield the electromagnetic wave. Since the performance is further improved, electromagnetic waves can be reliably shielded even if the length of the passage is short, and the space occupied by the passage can be relatively small.

[Brief description of drawings]

1 to 6 show an embodiment of the present invention.
1 and 2 are plan views of the electromagnetic wave shield structure, FIGS. 3 and 4 are perspective views of the passage, and FIGS. 5 and 6 are enlarged sectional views showing the structure of the floor, ceiling and walls of the passage. It is a figure. 1 ... doorway, 2 ... elevator, 3 ... stairs, 4
…… Emergency exit, 5 …… Hall, 6 …… Aisle, 6a …… Sidewall,
7 ... Electromagnetic wave shield material, 8 ... Dielectric material, 9 ... Ferrite tile, 10 ... Foam material.

Claims (3)

(57) [Claims] 1. An electromagnetic wave shield structure having a doorway,
Inside the entrance, a stepped passage having a predetermined length is formed in a tunnel shape inward of the structure, the inner end of the passage is branched left and right, and the periphery of the passage is covered with an electromagnetic wave shield member. An electromagnetic wave shield structure characterized by being provided. 2. The electromagnetic wave shield structure according to claim 1, wherein the length L of the passage is equal to or greater than the length of the ceiling height H or the width W of the passage, whichever is larger. 3. The electromagnetic wave shield structure according to claim 1, wherein an electromagnetic wave absorber such as a dielectric or a ferrite tile is attached alone or in combination on the electromagnetic wave shield member inside the passage. Stuff.