JP2000133984A - Electromagnetic disturbing wave shield structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a constitution suitable for a simple electromagnetic disturbing wave shield structure, by providing a radio absorptive material in which opposing walls have lager lengths than distance between the opposing walls, and arranging an opening shield between the opposing walls. SOLUTION: An electromagnetic disturbing wave shielding room 10 has an opening 16 made in a wall structure 15. A radio wave absorbing material 12 made of a ferrite tile or a conductive material is arranged on the inwall face of a frame 11. The frame 11 having U-shape in cross section has the opposing walls having the lengths larger than the length of the connecting wall therebetween, the radio wave absorbing material 12 also has the opposing walls having the lengths larger than the length of the connecting wall therebetween. The opening 16 is open/close by an opening shield 13. The opening shield comprises woven fabric or a metal plate, both of which have electromagnetic shield characteristics, and a roll is arranged in the upper frame 11 to roll up the opening shield 13. The lower part of the opening shield 13 is freely abutted on the lower wall part of the frame 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic shield room, that is, an electromagnetic interference shield structure, and more particularly, to an electromagnetic shield and an electromagnetic interference shield structure having radio wave absorption characteristics.

[0002]

2. Description of the Related Art Magnetic fields cause various obstacles to the human body and high-performance electronic equipment, so that a magnetically shielded room in which the equipment can operate normally is required. Many magnetically shielded rooms have been developed in the field of manufacturing semiconductors or in the field of scientific scientific equipment. For the magnetic shield room, that is, the electromagnetic interference wave structure, the thickness, number of layers, and interlayer dimensions of the magnetic shield material such as high permeability permroid, high conductivity copper and aluminum, and ferrite as a magnetic material should be appropriately selected. Is constituted by

[0003] The magnetically shielded room requires an opening because devices are arranged inside the room and the device is operated manually. The present applicant has proposed a door suitable for an opening of a magnetically shielded room in Japanese Patent Application Laid-Open No. Hei 5-332720.

[0004]

In the above-mentioned conventional example, a tube is arranged around an opening to fill the tube with a fluid, but it is not always suitable for a simple magnetic shield room. Therefore, an object of the present invention is to provide a configuration suitable for a simple electromagnetic interference wave shielding structure.

[0005]

According to the present invention, in order to solve the above-mentioned problems, a radio wave absorber is basically arranged in a frame of an opening, and an opening shield is slid with respect to the radio wave absorber. Using a moving means.

Specifically, the present invention provides a frame having a U-shaped cross section on at least the opposite side of an opening formed in a wall defining an electromagnetic wave shielding chamber, and a U-shaped cross section on the inner surface of the frame. An electromagnetic interference wave shield having a U-shaped wave absorber, wherein the length of the opposing walls of the radio wave absorber is longer than the distance between the opposing walls, and an opening shield is arranged between the opposing walls. Provide a structure.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS. The chamber 10 has an opening 16 made in the wall structure 15. The wall structure 15 is made of a dielectric material 15a in which carbon is dispersed in a foam, and is appropriately combined with an aluminum or copper plate 15b or a ferrite tile 15c. A frame 11 is arranged.

A radio wave absorber 12 made of a ferrite tile or a dielectric is arranged on the inner wall surface of the frame 11. As shown in FIGS. 2 and 3, the frame 11 having a U-shaped cross section has a length of the opposing wall longer than a length of the connecting wall therebetween, and the radio wave absorber 12 disposed on the frame 11 also has the same shape. The length of the opposing walls 12 ', 12' is made longer than the length of the connecting wall 12 ". The opening 16 is opened and closed by an opening shield 13. The opening shield 13 is a woven cloth having electromagnetic shielding properties. It is made of a metal plate, rubber, and flexible plastic, and a roll 14 is arranged in the upper frame 11.
The opening shield 13 is wound around the roll 14. The lower part of the opening shield 13 is made to be able to abut on the lower wall of the frame 11.

FIG. 3 shows entry of an electromagnetic wave or radio wave, that is, entry into the frame 11. The entry route of the electromagnetic wave is roughly classified into the route. The electromagnetic waves or radio waves in the entry route of the above are reflected or absorbed and attenuated by the connecting wall portion 12 ". The electromagnetic waves or radio waves in the entry route of the above are absorbed by the connecting wall portion 12". The electromagnetic wave or the radio wave entering from the approach path of is reflected by the opening shielding body 13 as shown by the dotted line. Such repetition of reflection is effective in attenuating electromagnetic waves and radio waves. The reflection and absorption are determined by the frequency of the electromagnetic wave and the characteristics of the frame 11 and the radio wave absorber 12. Some electromagnetic waves may be sequentially absorbed while being partially reflected by the radio wave absorber 12.

As shown in FIG. 3, even if the side edge of the opening shielding body 13 fits between the opposing wall portions 12 ', electromagnetic waves and radio waves can be attenuated, so that it can be manufactured as compared with the contact structure. It will be easier.

In the example shown in FIG. 4, the shield gasket 3 is fixed below the opening shield 13 and the shield gasket 3 is brought into contact with a radio wave absorber 12 attached to a frame 11. And a metal door which is not a roll-up type as shown in FIG. The example shown in FIG. 5 is one in which the lower part of the aperture shield 13 is hung on the radio wave absorber 12, and is effective in the case of the aperture shield 13 made of a soft material.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an opening.

FIG. 2 is a longitudinal sectional view of an opening.

FIG. 3 is a cross-sectional view showing a relationship between a frame and an electromagnetic wave entrance path.

FIG. 4 is a partial cross-sectional view of another example of the opening shielding body.

FIG. 5 is a sectional view of another example of the opening shielding body.

[Explanation of symbols]

 10 room 11 frame 12 radio wave absorber 13 opening shield 15 wall 16 opening

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Sumio Kaibuchi 1-13-5 Kudankita, Chiyoda-ku, Tokyo F-term (reference) in Riken Corporation 2E001 DH01 FA31 FA41 GA24 GA27 GA55 HB04 HB05 HD01 KA07 LA03 MA02 MA03 MA04 5E321 AA44 AA45 BB25 BB41 BB44 BB51 CC01 GG05 GG07 GG11

Claims (5)

[Claims] 1. A frame having a U-shaped cross section is attached to at least an opposite side of an opening formed in a wall defining an electromagnetic wave shielding chamber, and the frame is provided with a radio wave absorber having a U-shaped cross section on an inner surface thereof. An electromagnetic interference wave shielding structure, comprising: a length of a facing wall portion of the radio wave absorber that is longer than a distance between the facing wall portions; and an opening shielding body disposed between the facing wall portions. 2. The electromagnetic interference wave shielding structure according to claim 1, wherein a rectangular frame is fitted into the opening, a radio wave absorber is arranged on the inner peripheral surface thereof, and the opening shielding body is fitted and killed. 3. The electromagnetic interference device according to claim 1, wherein the opening shield moves up and down between opposing walls of the radio wave absorber on the upper edge side of the opening, and a lower portion thereof abuts or approaches the radio wave absorber on the lower edge side of the opening. Wave shield structure. 4. The electromagnetic interference wave shield structure according to claim 2, wherein the distance between the opposing walls of the radio wave absorber is set to reflect or absorb incident radio waves by the frame and the radio wave absorber. body. 5. The frame according to claim 1, wherein the frame is made of an electromagnetic wave shielding material.
An electromagnetic interference wave shielding structure as described in the above.