JPH02148892A - Magnetic shielding material and fixing thereof - Google Patents

Abstract

PURPOSE:To facilitate positioning and temporary fixing of a shielding material with respect to a main body by providing an adhesive or bonding agent which is provided on at least one surface of the laminated body of flake shaped soft magnetic amorphous alloy pieces having specified thickness and aspect ratio and nials and staples for fixing the laminated body to the main body of a building. CONSTITUTION:A magnetic shielding material comprising the following materials is provided: the laminated body of flake shaped soft magnetic amorphous alloy pieces having a thickness of 5-100 mum and an aspect ratio (the aspect ratio is a ratio between the minimum length and the maximum length) of 10-15,000; an adhesive or bonding agent 2 which is provided on at least one surface of the laminated body; and nails or staples 4 for fixing the laminated body to the main body of a building. It is desirable that the amorphous alloy piece is sandwiched with thin magnetic films in the structure of the laminated body. When the laminated body of the flake shaped soft magnetic amorphous alloy pieces is stuck to the main body of the building through the adhesive or bonding agent 2 and the nails or staples 4 are driven into the main body through the laminated body, the magnetic shielding material 3 is fixed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a magnetic shielding material stretched over a building frame and a method of fixing the same.

(Prior art) As disclosed in Japanese Patent Publication No. 62-58631, it is possible to block disturbances in magnetic fields caused by trains and automobiles, fluctuations in terrestrial magnetism, low-frequency magnetic fields generated from commercial power sources, etc. Preventing malfunctions and measurement errors is becoming more important year by year.

Generally, the materials used to block electromagnetic fields differ depending on the frequency. In the high frequency range, conductive materials such as copper and aluminum are mainly used, but in the low frequency range, magnetic shielding is the main focus, so magnetic materials such as iron and permalloy are mainly used.

However, in the case of shielding in a low frequency region and even a low magnetic field, it is necessary to use a material with high magnetic permeability, and permalloy is generally used.

(Problem to be solved by the present invention) However, permalloy has a significant deterioration in shielding properties due to distortion, and it is necessary to perform construction in a manner that does not add strain.
It could not be easily fixed, resulting in high costs.

In addition, in the case of magnetic materials with lower magnetic permeability than permalloy such as iron plates, it is not possible to shield to low magnetic fields, or it is necessary to use welding fixation during construction because it can be countered by increasing the wall thickness. Furthermore, it has disadvantages such as being quite heavy in some cases, making it impossible to construct.

Therefore, it is an object of the present invention to solve the above-mentioned problems of the prior art.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention aims to solve the problems described above.
00μIll, aspect ratio (however, aspect ratio is the ratio of maximum length to minimum length) 10-1500
A magnetic shielding material consisting of a laminate of flaky soft magnetic amorphous alloy pieces of 0, an adhesive or adhesive provided on at least one surface of the laminate, nails or staples for fixing the laminate to the building frame. provide. Preferably, the laminate has a structure in which an amorphous alloy piece is sandwiched between a thin non-magnetic film.

Furthermore, the present invention provides a method for attaching a laminate of flaky soft magnetic amorphous alloy pieces to a building frame using an adhesive or an adhesive;
To provide a method for fixing a magnetic shielding material by driving nails or staples into a building frame through a laminate.

(effect) Soft magnetic amorphous alloy flakes (hereinafter simply referred to as amorphous alloy flakes).

) If the thickness is less than 5 μm, it will be difficult to produce an amorphous alloy piece, and if it becomes thicker than 100 μm, it will be difficult to make it amorphous, so the thickness should be 5 to 100 μm. A particularly preferred thickness is 20 to 60 μm.

If the aspect ratio of the amorphous alloy flakes is less than 10, the i31 ratio of the amorphous alloy flakes decreases, the magnetic properties of the amorphous alloy flakes change, and lamination becomes difficult, resulting in deterioration of magnetic shielding properties. It becomes like this. On the other hand, if the aspect ratio is 1500
If it exceeds 0, handling of the amorphous alloy pieces becomes troublesome and productivity decreases. A particularly preferred range of aspect ratio is 50 to 10,000.

The sheet of the present invention has a high magnetic permeability, and there is little property deterioration due to strain, and even if there is, it occurs only in local flakes, so the overall shielding property does not deteriorate, and it has high Due to its magnetic permeability, only a small amount is required, making it extremely easy to install.

The magnetic shielding material according to the present invention can be easily installed because it only needs to be attached to the frame of a building.

(Example) The cavitation method previously disclosed in Japanese Patent Application Laid-open No. 58-6907 by the present applicant (a roll having a surface layer with low leakage to molten metal and rotating at high speed) Co6s, Amorphous metal flakes of aFea, z Si+b B++ (the number attached to the element symbol represents the atomic % of the elemental component; the same applies hereinafter) were produced. The magnetostriction of this amorphous alloy is zero, the saturation magnetic flux density is 7000G, and the magnetic permeability is t.
oooo, the crystallization temperature is 512°C. The amorphous alloy flakes have an average thickness of 40 μm and an aspect ratio of 200 to 500.

This amorphous alloy flake has a width of 600 +n and a thickness of 30μ.
A polyester film g of m is uniformly placed and laminated, and a 30 μm thick polyester film is placed on top of it.
covered with a polyester film. This sandwich-like composite sheet was passed between two silicone rubber rolls heated to 100° C. and pressed together to form a long amorphous alloy laminate sheet with a thickness of 150 μm.

At least one surface of this sheet is coated with an acrylic or rubber adhesive, or an acrylic, epoxy, silicone, or phenol adhesive.

Four layers of the above-mentioned sheets were stacked on the outer circumferential surface of a tunnel-shaped CRT shield box (450 x 400 x 420 mm) made of plywood with a thickness of 10 cranes, using an acrylic oil-based adhesive (BPS-1109: Toyo Ink). Ta.

The 50tlz 30mG magnetic field of the transformer was shielded to 1mG, eliminating image shaking on the computer CRT.

A wooden shield room measuring 4 m x 5 m x 2.4 m was made, and after making it flat with plasterboard, 10 layers of the above-mentioned sheets were layered on top of it using an acrylic oil-based adhesive. . I used a gun tacker to drive staples into the space 3,001 meters wide on the left and right, and 400 cranes wide on the top and bottom. There is no razor on the seat, and the influence of power lines is 50Hz, 50mG.
was shielded to 5 mG, preventing image shake on a computer CRT.

Note that nails and staples are made from non-magnetic materials such as brass and stainless steel. Also, instead of polyester film,
Aluminum, copper or stainless steel may also be used.

FIG. 1 shows a typical configuration of the present invention, in which a shield body 3 of amorphous alloy flakes sandwiched between polyester films is laminated on a building frame l via an adhesive 2,
This laminate is fixed to the frame with nails 4. The nails 4 or staples serve to prevent the shield from sagging due to thermal deformation.

(Effects) Since the shield body is fixed to the building body via adhesive or adhesive, it is easy to position and temporarily fix the shield body to the building body. Furthermore, magnetic shielding of existing rooms is easy because there is no need to modify the existing framework.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view of an example of the present invention. In the figure: 1--Structure, 2-Adhesive, 3-Shield body.

Claims (3)

[Claims] (1) Thickness 5 to 100 μm, aspect ratio (however, the aspect ratio is the ratio of the maximum length to the minimum length) 10
A magnetic shielding material consisting of a laminate of ~15,000 flakes of soft magnetic amorphous alloy pieces, an adhesive or adhesive provided on at least one surface of the laminate, and nails or staples for fixing the laminate to the building frame. . (2) The magnetic shielding material according to claim (1), wherein the laminate has an amorphous alloy piece sandwiched between a thin non-magnetic film. (3) Magnetic shielding material made by attaching a laminate of flake-shaped soft magnetic amorphous alloy pieces to the building frame using adhesive or adhesive, and driving nails or staples into the building frame through the laminate. Fixed method.