JP2810928B2 - Magnetic shield room - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial applications]

TECHNICAL FIELD The present invention relates to a magnetically shielded room constituted by using powder of a highly magnetically permeable material.

[Prior art]

When detecting a weak magnetic field from a living body in the medical field, a magnetically shielded room that shields an external magnetic field is required. Also, in the field of physical measurement, a magnetically shielded room is required to perform high-performance measurement by shielding an external magnetic field. As described above, a magnetically shielded room may be required in various fields.In such a case, a conventional magnetically shielded room uses, for example, a steel sheet of a ferromagnetic material such as a silicon steel sheet, or a flat sheet. A magnetic shield panel is used in which a sheet of a ferromagnetic material having a magnetic shielding property such as permalloy is adhered to the surface of a wooden board as a base board. FIG. 3 is a diagram showing a configuration example of a conventional magnetic shield panel using permalloy. In the figure, 11 is a stud, 13 is a nail,
14 indicates a panel, 15 indicates a permalloy, and 16 indicates a covering material. A conventional magnetic shield panel using permalloy is, for example, as shown in FIG. 3, a permalloy 15 is arranged on a wooden panel 14 of a base plate and attached with nails 13 or screws such as non-magnetized brass or aluminum. 16 is used so as to cover a gap formed at a joint portion of the attachment portion and the permalloy 15.

[Problems to be solved by the invention]

However, when constructing a magnetically shielded room using a steel sheet of a ferromagnetic material such as a silicon steel sheet, since the constituent materials are heavy, it is necessary to use a lifting machine and the like, and the construction work is also large, and the structure is large. Reinforcement, safety measures, cost, etc. become problems. In that respect, Permalloy has high magnetic permeability and can be thinned to ensure magnetic shielding performance. However, Permalloy has various problems in manufacturing as a sheet of a magnetic shielding material. That is, for example, it is difficult to produce a large-sized product, and the production dimensions are more likely to vary than a steel plate. Further, when mechanical or thermal stress is applied, the performance is significantly deteriorated. However, in the case where permalloy is used as a shielding material as shown in FIG. 3, a hole for passing a nail 13 or a screw through permalloy 15 is formed on site, and a permalloy 15 is attached to a flat wooden board panel 14.
Must be attached. However, when you make a hole,
Since the permalloy around the permalloy is distorted, performance is degraded. To prevent this, it is necessary to perform annealing such as drilling and then annealing in a hydrogen atmosphere furnace. For this reason, if a hole is drilled at a construction site, the site is returned to a factory or the like and annealing is performed again, which causes a problem that time and cost increase. Furthermore, when a hole is made in permalloy, magnetic leakage from that portion becomes a problem. Therefore, it is necessary to further cover the permalloy with the covering material 16 after attaching the permalloy. However, nails 17 or screws are also used for attaching the covering material 16. In addition, when annealing is performed after drilling, there is a problem that the positions of the holes do not match. As described above, the high magnetic permeability material used for the magnetic shield room is deteriorated by external factors such as distortion due to pressure and heat, so that sufficient care is required in handling the material.
Further, when the wall surface of the magnetic shield room is covered with the metal thin film, the joining of the metal thin films becomes a problem. If there is a gap in the joining portion, a magnetic closed circuit cannot be formed, so that the shielding performance is reduced. The present invention has been made to solve the above problems, and aims to provide a magnetically shielded room capable of eliminating work such as drilling on site, improving workability and productivity, and preventing deterioration in performance. I do.

[Means for Solving the Problems]

Therefore, the present invention provides a magnetically shielded room configured by covering the surrounding wall surface with a highly magnetically permeable material, and spraying a powder of the highly permeable material from a nozzle at a high temperature to secure the magnetic shielding performance of the wall surface. It is a feature. Since it is only necessary to spray the powder of the highly permeable material from the nozzle at a high temperature as described above, drilling at the site is eliminated, so that deterioration of shielding performance can be prevented, and workability and productivity can be improved. .

【Example】

Hereinafter, embodiments will be described with reference to the drawings. FIG. 1 is a view showing one embodiment of a magnetic shield room according to the present invention. In the drawing, reference numeral 1 denotes a base panel, reference numerals 2 and 4 denote magnetic shield sheets, and reference numerals 3 and 5 denote sprayed materials. In FIG. 1, a base panel 1 is made of a wooden material, such as a plywood, and has a magnetic shield sheet 2,
Numeral 4 is made of a magnetic material having a high magnetic permeability such as, for example, permalloy. The magnetic shield room according to the present invention,
As shown in FIG. 2A, the magnetic shield sheet 2 is arranged and adhered to the surface of the base panel 1 as shown in FIG. 2B, and the gap is formed by the thermal spraying material 3 as shown in FIG. One magnetic shield layer is formed by covering the magnetic shield layer. Then, as shown in FIG. 4D, the magnetic shield sheet 4 and the thermal spraying material 3 may be overlapped and adhered to form a multilayer magnetic shield layer on the surface of the base panel 1. When the magnetic shield sheets 2 and 4 are bonded by using an adhesive and applying a uniform load by pressing, a uniform surface can be formed with high accuracy, and a magnetically shielded room excellent in aesthetic appearance can be formed. In addition, since holes such as screws are not formed, it is possible to prevent deterioration of the magnetic shield performance due to the hole forming process as in the conventional method. Further, the magnetic shield sheets 2 and 4 and the thermal spraying material 3,
5 covers the surface of the base panel 1 without any gaps, and furthermore, by constituting the magnetic shield layer with a multi-layer structure, even if there are variations in the manufacturing dimensions of the magnetic shield sheets 2 and 4, this can be absorbed. . Therefore, irrespective of the magnetic shield sheets 2 and 4, the dimensional accuracy of the magnetic shield panel can be improved, and the performance of the magnetic shield room can be improved. FIG. 2 is a view for explaining one embodiment of a method for constructing a magnetic shield room according to the present invention. As shown in FIG. 2, the thermal spraying material sprays a powder 6 of a highly permeable material from a nozzle 7 at a high temperature. It should be noted that the present invention is not limited to the above embodiment, and various modifications are possible. For example, in the above embodiment, the magnetic shield sheets are arranged side by side, and the gap is covered with the thermal spraying material. However, the entire surface may be covered with the thermal spray material without using the magnetic shield sheet. When the magnetic shield sheets are arranged side by side, it is necessary to increase the adhesive force by applying a load when laminating as described above.However, when the wall surface is covered only with the thermal spraying material, the effect of the load etc. is small. , Can not join. Further, although the shield layer is doubled, a triple or more multilayer structure may be used.

【The invention's effect】

As is clear from the above description, according to the present invention, since it is covered with the thermal spraying material, the seam, the wall, the ceiling, and the corner of the floor can be easily improved in performance, and the workability and the performance are improved. Can be. In addition, since a plurality of sheets are bonded to the base panel and the seam is covered with the sprayed material to form the shield layer, high magnetic shield performance can be ensured even with a light weight. Therefore, it can be easily installed even in an existing low-strength building that cannot be installed due to its weight in a magnetic shield room made of steel plates. In addition, since the wall surface is covered by bonding or thermal spraying without using a screw or the like, the construction of the magnetic shield room can be saved, and the workability and productivity can be improved. In particular, when the wall surface is covered only with thermal spraying material, the influence of the load and other forces is small, and the joint cannot be formed.
The wall and ceiling can be integrated into a magnetic closed circuit, and further improvement in performance can be expected. In addition, the method using a magnetic thin film
The maximum area of the thin film becomes about 300 × 1000 mm. For this reason,
In order to allocate a thin film to the panel created using plywood,
Although it takes time and effort to create and execute the construction drawing, the time and effort can be saved in the case of only the thermal spraying material. Further, although the magnetic shield room is considered to have the highest performance in a spherical shape, the use of a thermal spraying material is more advantageous in terms of process and economy than the case where a magnetic thin film is used. In addition, in the case where a magnetic shield is applied to an existing building, the present invention can be easily performed and high performance can be secured as compared with the conventional building.

[Brief description of the drawings]

FIG. 1 is a view for explaining one embodiment of a magnetic shield panel according to the present invention, FIG. 2 is a view for explaining one embodiment of a method of constructing a magnetic shield room according to the present invention, FIG. FIG. 3 is a diagram showing a configuration example of a conventional magnetic shield panel using permalloy. DESCRIPTION OF SYMBOLS 1 ... Under panel 2,4 ... Magnetic shield sheet 3,5 ... Spray material 6 ... Powder of high magnetic permeability material 7 ... Nozzle

Continuation of the front page (72) Inventor Noboru Ishikawa 2-16-1 Kyobashi, Chuo-ku, Tokyo Shimizu Construction Co., Ltd. (58) Field surveyed (Int.Cl. ⁶ , DB name) E04B 1/92 E04H 9 / 14 H05K 9/00

Claims (2)

(57) [Claims] 1. A magnetically shielded room formed by covering a peripheral wall surface with a highly magnetically permeable material, wherein a powder of the highly permeable material is sprayed at a high temperature from a nozzle to secure magnetic shielding performance of the wall surface. And magnetic shield room. 2. The magnetically shielded room according to claim 1, wherein the joint of the plate of the highly permeable material is covered with thermal spraying of the powder of the highly permeable material.