JP2559427Y2 - Magnetic shielding structure of opening door of magnetic shielding room - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic shielding structure for an opening door of a magnetic shielding room.

[0002]

2. Description of the Related Art In general, a magnetically shielded room has a structural surface (ceiling, wall, floor) made of a soft magnetic material such as an electromagnetic soft iron or a high magnetic permeability material. It is necessary to reliably carry out a shielding process of a door at an opening for carrying in / out of equipment to / from a magnetic shielding room, an entrance / exit of an operator, and a joint portion with a structural surface when the door is closed.

[0003] For this purpose, the door is made of electromagnetic soft iron or a material having a high magnetic permeability, or is constituted by incorporating these materials, and is placed around the opening in magnetic contact with the magnetic metal on the structural surface. It is common to attach to the formed door frame via packing. Conventionally, a rubber-based or urethane rubber-based material has been used as a packing interposed in a contact portion between a door periphery and a door frame. The packing made of this material is intended for airtightness and sound insulation of the room, and for buffering the contact of the door, not for the purpose of magnetic shielding, and a leakage magnetic field is observed between the inside and outside of the room.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned drawbacks of the conventional magnetic shielding structure of an opening door of a magnetic shielding room. It is an object to provide a magnetic shielding structure capable of reliably preventing magnetic leakage.

[0005]

According to the present invention, in order to solve the above-mentioned problems, the door body is made of a soft magnetic material stretched over the entire surface, and the door frame wound around the opening forms a structural surface of the room. It is formed of a soft magnetic material in a state of being in magnetic contact with the soft magnetic material to constitute, and between the peripheral portion of the door and the door frame,
5-100 μm thick, aspect ratio 10-15,000
A magnetic shielding packing formed by filling a flaky soft magnetic amorphous alloy piece into a flexible tube is interposed.

[0006]

As described above, the magnetic shielding structure of the door of the magnetic shielding room of the present invention is as described above, and the structural surface (ceiling, wall, floor) of the room is made of a soft magnetic material, and is magnetically in contact with this. Since the door body, which is made of a soft magnetic material, is covered with a soft magnetic material over the entire surface, the space between the door frame and the door body is filled with a magnetic shielding material without any gap. The opening will be completely magnetically shielded. In the magnetic shielding configuration of the opening door according to the present invention, a flaky soft magnetic material having a thickness of 5 to 100 μm and an aspect ratio of 10 to 15,000 is placed in a flexible tube between the periphery of the door body and the door frame. Since the packing is filled with amorphous alloy pieces, the packing completely fits and adheres to the opposing surfaces of the door body and the door frame, and the soft magnetic amorphous alloy is sandwiched by a flexible tube film. The opening is completely magnetically shielded with airtightness, sound insulation, and cushioning at the same time.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. 1 and 2 are a perspective view and a sectional view, respectively, showing an embodiment of the configuration near the opening of the magnetically shielded room to which the present invention is applied. The structure (ceiling, wall, floor) 6 of the magnetically shielded room is made of a plate of soft magnetic material such as electromagnetic soft iron or a high magnetic permeability material, and a door made of a soft magnetic material surrounding the opening. The frame 1 is provided in magnetic contact with the magnetic metal on the structural surface 6. The door 2 is pivotally attached to one edge of the opening via a hinge 8. When the door is closed, a predetermined gap is formed between the peripheral portion of the inner surface of the door and the outer surface of the door frame 1 as shown in FIG. Oppose each other. Inside the door 2, a soft magnetic material plate 7 such as an electromagnetic soft iron or a high magnetic permeability material is stretched over the entire surface.

A packing 3 is mounted on the outer surface of the door frame 1 so that when the door 2 is closed, the space between the inner peripheral portion of the door 2 and the outer surface of the door frame 1 can be filled without gaps. ing. The packing 3 includes a flaky soft magnetic amorphous alloy piece 4 in a flexible tube 5 made of stainless steel mesh or a flexible tube such as a rubber or urethane rubber tube.
It is constituted by filling. The flake-shaped soft magnetic amorphous alloy piece used has a thickness of 5 to 100 μm and an aspect ratio (length / thickness) of 10 to 15,000. Therefore, the aggregate of the flake-like alloy pieces is formed by the inner surface of the door and the door frame 1.
When the pressure is narrowed on the outer surface of the tube, it conforms to the shape of each surface and uniformly presses the inner surface of the door 2 and the outer surface of the door frame 1 via the membrane surface of the tube without any gap. The magnetism of the crystalline alloy piece completely shields the space between the structural surface 6 of the chamber and the soft magnetic material plate 7 of the door 2, and the outer surface of the tube 5 covers the inner surface of the door 2 and the outer side of the door frame 1. By tightly contacting the side surface without any gap, airtightness, sound insulation, and cushioning when opening and closing the door can be obtained.

The amount of the flake-shaped soft magnetic amorphous alloy piece 4 to be filled in the flexible tube 5 of the packing 3 varies depending on the dimensions of the magnetic shield packing 3, but in order to maintain the magnetic shielding function. It is desirable that the filling amount is 10 g / cm ³ or more. Further, by changing the filling amount according to the required magnetic shielding performance, the shielding performance between the door frame 1 and the door 2 can be maintained at the required performance.

[0010]

As described above, according to the present invention, in addition to reliably preventing magnetic leakage from the opening door of the magnetically shielded room and the joint between the door and the door frame, the airtightness of the room and sound insulation are provided. Properties and cushioning when the door is opened and closed.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a magnetic shielding structure of an opening of a magnetic shielding room and a door as an embodiment of the present invention.

FIG. 2 is a cross-sectional view thereof.

FIG. 3 is a side view including a cross section showing a configuration of the magnetic shielding packing.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Door frame 2 Door 3 Magnetic shielding packing 4 Flake-shaped soft magnetic amorphous alloy piece 5 Flexible tube of stainless mesh or rubber 6 Magnetic shielding room structure 7 Soft magnetic material plate 8 Hinge

Claims (1)

(57) [Scope of request for utility model registration] 1. A magnetic shielding structure of an opening door of a magnetic shielding room in which a structural surface of a room is made of a soft magnetic material, wherein the door body is made of a soft magnetic material stretched over the entire surface, and is turned around the opening. The door frame is formed of a soft magnetic material in magnetic contact with the soft magnetic material of the structural surface of the room, and has a thickness of 5 to 100 between the periphery of the door and the door frame.
A magnetic shielding structure for an opening door, characterized by interposing a magnetic shielding packing formed by filling a flexible tube with a flake-shaped soft magnetic amorphous alloy piece having an aspect ratio of 10 to 15,000 μm.