JPH11243295A - Magnetic shield method and structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic shield room which is high in air permeability at a low cost. SOLUTION: A magnetic shield method is carried out in a manner where a coil 13X is wound around a frame structure 9 having open sides 10, and the ends of the coil 13X are connected together, wherein the coil 13 is composed of three coils, and the axes of the coils are made to intersect each other at right angles. This magnetic shield structure is equipped with connectors 12 provided to the frame structure which is capable of pivoting, and the coil 13 can be made connected or disconnected through the intermediary of the connectors 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to the production of industrial materials,
It belongs to the technical field of magnetic shields used for measuring magnetic fields for medical use.

[0002]

2. Description of the Related Art Conventionally, when a low-magnetic-field space is required when measuring a low-magnetic-field alternating current in the manufacture of industrial materials, measurement of a magnetic field for medical use, etc., it is necessary to shut off an external magnetic field. Establishing a shield room creates a low magnetic field space. As the shield room, a material having a closed structure with as few openings as possible using a material having high magnetic permeability such as iron or permalloy has been put into practical use as a general method. As another method, a current is made to flow according to the fluctuation of the surrounding environmental magnetic field by facing the coil, and the magnetic field is canceled by creating a magnetic field in the opposite direction, and the internal magnetic field is uniformly reduced, and furthermore, iron An electromagnetic shielding method that is effective for high-frequency electromagnetic waves surrounded by a conductive metal such as copper or a method that uses superconductivity is known.

[0003]

FIG. 4 (A)
As shown in the figure, in the shield room 1, a door opening 2 for carrying in and out of a person or a tool is required, and when working inside, a minimum amount of air is required. Therefore, a ventilation opening 3 for removing generated heat and contaminated air is required, and in some cases, it is necessary to provide a window to take in light.

[0004] However, among the above-mentioned conventional systems, a system in which the shield room has a closed structure has a higher performance as the structure is always a closed structure, and the performance tends to decrease if an opening or a gap accompanying the opening is opened. For this purpose, conventionally, several openings made of a thin tube made of a material having high magnetic permeability are made to penetrate the wall surface, or as shown in FIG. Although methods of reducing the size have been adopted, these methods have problems that a large opening cannot be formed, and that labor and cost increase.

On the other hand, in the system using the canceling magnetic field, although the surrounding space can be freely opened, a large coil must be formed in order to obtain a uniform magnetic field, so that the space efficiency is poor, and a detector and a current flow. There are drawbacks such as the necessity of facilities for the use. In addition, the electromagnetic shielding method has a problem that it is ineffective at low frequencies, and the method using superconductivity is still limited to trial applications and is not practical.

An object of the present invention is to solve the above-mentioned conventional problems and to provide a magnetic shield method and a magnetic shield structure capable of forming a magnetic shield room in which air can freely flow at low cost. I do.

[0007]

According to a first aspect of the present invention, there is provided a magnetic shield method comprising: winding a coil around a frame structure having an opening on an outer surface; and connecting both ends of the coil. According to a second aspect of the present invention, there is provided a magnetic shield method according to the first aspect, wherein the coil comprises three coils, and respective axes of the coils are orthogonal to each other. A frame structure having an opening on the outer surface, a coil wound around the frame structure and connected at both ends, and a connector rotatably provided on the frame structure, wherein the coil is a connector It is characterized in that it can be brought into contact with and separated from through.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show one embodiment of the magnetic shield structure of the present invention. FIG. 1 (A) is a schematic diagram showing the entire configuration, and FIGS. 1 (B) and 1 (C) show examples of a coil. FIGS. 2A and 2B are views showing a mounted state of the coil.

In FIG. 1A, a shield room 5
Are connecting members 7 connecting the columns 6 of the non-conductive material and the columns 6
Accordingly, an opening 10 is formed in the side surface and the upper surface of the frame structure 9. A pair of upper and lower connectors 12 are rotatably mounted on one of the columns 6 by hinges 11.

A coil 13X is wound around the frame structure 9, and both ends of the coil 13X are connected at a connection point 15. A conductor 13a is connected between the connectors 12, and
The coil 13X can be connected to and separated from the conductor 13a via the connector 12. Thereby, when the connector 12 is rotated, the conducting wire 13a between the connectors 12 is
Away from the opening, a person or a tool can be carried in and out of the opening.

In the case of the rectangular frame structure 9 shown in FIG. 1A, the shape of the coil is rectangular as shown in FIG. 1B. As shown in (C), the shape is round, that is, it corresponds to the shape of the frame structure.

In the above magnetic shield structure, the coil 1
When magnetism enters the 3X from the X direction, a current flows in the coil 13X in a direction that obstructs the magnetism, and the coil 13X
A space can be created inside X that has less fluctuation than an external magnetic field. The direction of the axis of the coil may be adjusted to the direction of the entering magnetic field. In the case where the magnetic field enters from various directions, as shown in FIG. Wound, coil 13
The axes of the coils 13Y and 13Z may be aligned with the Y-axis direction and the Z-axis direction which are perpendicular to the X-axis which is the X direction. The coil can be wound densely and coarsely depending on the winding method. By roughly winding, a shield room whose wall surface is not closed can be made, and therefore, a magnetic shield can be easily and inexpensively formed, especially when it is desired to uniformly flow laminar air inside. . Further, since the coil material is flexible, a magnetic shield whose shape is not fixed can be formed.

FIG. 3 shows another embodiment of the magnetic shield structure of the present invention. FIG. 3 (A) is a schematic view showing a part of the coil, and FIG. 3 (B) is a schematic view showing the magnetic shield structure. is there. This embodiment is an example in which connectors 17 are provided at both ends of a cloth body 16, and a conductor 19 is wired in the cloth body 16 between the connectors 17, 17 to form a coil unit 20. Then, a large number of the coil units 20 are sequentially attached to the inner wall of the room and connected by the connector 17 to form a shield room. In addition, the coil unit 20 is formed in the size of the wall forming the shield room, folded when not in use, and expanded when necessary, as shown in FIG. Thus, a movable magnetic shield can be produced. The opening may be formed in the cloth 16.

[0014]

As is apparent from the above description, according to the present invention, a magnetically shielded room in which air can freely flow can be formed at low cost.

[Brief description of the drawings]

FIG. 1 shows an embodiment of a magnetic shield structure according to the present invention, and FIG. 1 (A) is a schematic view showing the entire configuration, FIG.
FIG. 1C is a diagram illustrating an example of a coil.

FIG. 2 is a diagram showing a mounted state of a coil.

FIG. 3 shows another embodiment of the magnetic shield structure of the present invention, and FIG. 3 (A) is a schematic view showing a part of a coil;
(B) is a schematic diagram showing a magnetic shield structure.

FIG. 4 is a diagram showing a conventional shield room.

[Explanation of symbols]

 9: Frame structure 10: Opening 12: Connector 13X, 13Y, 13Z: Coil

Claims (3)

[Claims] 1. A magnetic shield method comprising: winding a coil around a frame structure having an opening on an outer surface; and connecting both ends of the coil. 2. The magnetic shielding method according to claim 1, wherein the coil comprises three coils, and respective axes of the coils are orthogonal to each other. 3. A frame structure having an opening on an outer surface, a coil wound around the frame structure and connected at both ends, and a connector rotatably provided on the frame structure. A magnetic shield structure wherein the coil can be connected and separated via a connector.