JPH03220277A - Self-adhesive tape with magnetic shielding capability and magnetic shielding room - Google Patents

Abstract

PURPOSE:To prepare the title tape used for jointing sheets for constructing a magnetic shielding room and capable of improving the workability in constructing the room by mixing a specific substance into a self-adhesive used to prepare the tape. CONSTITUTION:A self-adhesive tape used for jointing sheets for constructing a magnetic shielding room is prepared by using a self-adhesive contg. a powdered magnetic substance.

Description

DETAILED DESCRIPTION OF THE INVENTION: Industrial Application Field The present invention relates to an adhesive tape that connects the joints of sheets constituting a magnetically shielded room, and a magnetically shielded room constructed using the adhesive tape.

[Conventional technology]

When detecting a weak magnetic field from a living body in the medical field, a magnetically shielded room that shields external magnetic fields is required. Furthermore, in the field of physical measurement, when measuring magnetic fields and the like with high performance, a magnetically shielded room that shields external magnetic fields is required.

As mentioned above, there are cases where magnetically shielded rooms are required in various fields, but in such cases, conventional magnetically shielded rooms use, for example, electromagnetic steel plates, silicon steel plates, or permalloy etc. on flat wooden boards. It is constructed using a magnetic shield panel attached with a sheet that has magnetic shielding performance.

Fig. 3 is a diagram showing the configuration of a conventional magnetically shielded room using permalloy, and Fig. 4 is a diagram showing an example of the configuration of a conventional magnetically shielded room using adhesive.
13 and 17 are studs, 14 and 21 are panels, 15 and 22 are permalloy, 16 and 23 are covering materials, and 24 is an adhesive.

A conventional magnetically shielded room using permalloy, for example, as shown in FIG. The fitting is done so as to cover the gaps that occur at the joints of the permalloy parts and the permalloy 15.

In addition, as shown in Figure 4, permalloy 2 is applied to the surface of the panel.
2 are lined up and the gap between the seams is covered with permalloy material 23.
In some cases, the permalloy 22, 23 is attached by covering it with a permalloy and gluing it with an adhesive 24. In this case, the adhesive 24 used is, for example, an epoxy adhesive without magnetic properties.

[Problem to be solved by the invention]

However, when constructing a magnetically shielded room using electromagnetic steel sheets or silicon steel sheets, the construction materials are heavy, requiring the use of lifting machines, etc., and the construction work becomes large-scale, requiring reinforcement of the structure and safety. Countermeasures, costs, etc. become issues.

Additionally, permalloy has a problem in that its performance deteriorates significantly when mechanical or thermal stress is applied. In that case, if additional processing such as drilling holes is added, it must be annealed in a hydrogen atmosphere furnace. However, when permalloy is used as a shielding material as shown in Fig. 5, it is necessary to drill holes for nails 13 or screws in order to attach par 70-15 to a flat wooden panel 14 on site. Become. However, when holes are drilled on-site, the permalloy surrounding them is distorted, so unless annealing is performed, shielding performance will be significantly reduced. Therefore, at construction sites where annealing cannot be performed, even if you try to attach a permalloy sheet to a flat piece of wood, you will not be able to drill holes at the construction site. Therefore, in order to maintain a certain level of shielding performance even after drilling a hole at a construction site, it is necessary to return the material from the site to a factory or the like and annealing it again, which increases time and cost.

Furthermore, if there is a hole in permalloy, magnetic leakage from that part becomes a problem. Therefore, it is necessary to cover the plates with a covering material 16 after pasting the permalloy.

However, nails 17 or screws are also used to attach this covering material 16.

Moreover, if the holes are annealed later, there is a problem that the positions of the holes will not match.

On that point, as shown in Figure 4, when permalloy is attached to the surface of a panel with adhesive, there is no need to drill holes, which solves the above problem. In this case, a gap is created and a magnetic closed circuit is not formed. For this reason, a band-shaped sheet is glued into the gap and pressure is applied to enhance the adhesion effect between the metals. As a result, the application of force causes deterioration in performance due to stress as described above. Particularly when repairing ceilings and walls, it is difficult to apply pressure evenly to the adhesive to improve the adhesive effect. Furthermore, since the adhesive does not have magnetic shielding properties, even if it is covered with a permalloy covering material from above, the magnetic path connection between the permalloy parts is insufficient, resulting in the problem of magnetic leakage. Saro requires curing until the adhesive hardens, resulting in poor workability and productivity.
There is a problem called 1.

The present invention solves the above-mentioned problems, and improves workability and productivity by eliminating the need for on-site hole drilling, etc.
The purpose of the present invention is to provide an adhesive tape and a magnetically shielded room with magnetic shielding performance that can prevent deterioration of performance.

[Means to solve the problem]

To this end, the present invention provides an adhesive tape for connecting the joints of sheets constituting a magnetically shielded room, which is characterized by containing powdered magnetic material and having a mesh made of non-magnetic material. shall be. In addition, a magnetically shielded room constructed using this adhesive tape is constructed by arranging sheets made of magnetically shielding material and connecting the seams between the sheets with adhesive tape mixed with powdered magnetic material to construct a magnetically shielded space. It is characterized by

[Effect]

In the adhesive tape and magnetic shield room with magnetic shielding performance of the present invention, powdered magnetic material is mixed into the adhesive tape to connect the seams between sheets of magnetic shielding material. The magnetic circuit is connected through the joint to prevent magnetic leakage at the seam. Therefore, it is possible to prevent deterioration of the magnetic shielding performance at the joints between the sheets forming the magnetically shielded space.

〔Example〕

Examples will be described below with reference to the drawings.

Fig. 1 is a diagram for explaining one embodiment of a magnetically shielded room using the adhesive tape according to the present invention, and Fig. 2 is a diagram for explaining another embodiment of the magnetically shielded room using the adhesive tape according to the present invention. This is a diagram for In the figure, 1 and 4 are permalloy sheets, 2.5 and 6 are adhesive tapes, and 3 is a panel.

In FIG. 1, a permalloy sheet 1 is a magnetic shielding material that covers the surface of a base panel 3, such as a wooden board, which does not have magnetic shielding performance, and ensures magnetic shielding performance on that surface. The adhesive tape 2 contains magnetic powder having high magnetic permeability and low coercive force, and is intended to cover the gaps between the permalloy sheets 1 spread over the surface of the panel 3.

Note that the adhesive tape 2 may include a mesh made of a non-magnetic material such as nylon or polyester, as appropriate, in order to maintain tape strength.

When the gap between the permalloy sheets 1 of the magnetic shielding material is covered with the adhesive tape 2 as described above, the magnetic paths between the permalloy sheets 1 are connected by the adhesive tape 2, so the magnetic shielding occurs at the joints of the permalloy sheets 1. Magnetic leakage from the surface can be prevented.

In addition, in the example shown in FIG. 2, a permalloy sheet 4 is used as a covering material, and the gap between the permalloy sheet 1 is covered with the permalloy sheet 4.
The structure is such that the space between the two is adhered with adhesive tape 5 and 6 on both sides. Even if you do this, each permalloy sheet 1
The magnetic path between the adhesive tape 5.6 and the permalloy sheet 4
Connected with

Note that the present invention is not limited to the above embodiments, and various modifications are possible. For example, in the above embodiment, permalloy was used as the magnetic shielding material, but it goes without saying that the present invention may be applied to structures using other magnetic shielding materials. Further, the double-sided adhesive tape of the present invention may be used to attach a permalloy sheet to a base plate panel.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, sheets having magnetic shielding performance are arranged on flat trees, and the gaps between the sheets are covered with adhesive tape having magnetic shielding performance, which improves workability. can be achieved. Moreover,
Since holes are not drilled in the magnetic shielding material such as permalloy, deterioration in magnetic shielding performance can be prevented.

[Brief explanation of drawings]

Fig. 1 is a diagram for explaining one embodiment of a magnetically shielded room using the adhesive tape according to the present invention, and Fig. 2 is a diagram for explaining another embodiment of the magnetically shielded room using the adhesive tape according to the present invention. Diagram for explanation, Figure 3 uses permalloy 5
Also, Figure 4 shows an example of the configuration of a conventional magnetically shielded room.
The figure shows an example of the configuration of a conventional magnetically shielded room (using adhesive). 1 and 4...permalloy sheet, 2.5 and 6...adhesive tape, 3...panel. Applicant Shimizu Corporation Sub-Agent Patent Attorney Ryukichi Abe (6 others) Figure 1 Figure 2 (a) Figure 3

Claims (3)

[Claims] (1) An adhesive tape that connects the joints of sheets constituting a magnetically shielded room, and has magnetic shielding performance and is characterized by containing powdered magnetic material. (2) The adhesive tape with magnetic shielding performance according to claim 1, further comprising a mesh made of a non-magnetic material. (3) A magnetically shielded room characterized in that a magnetically shielded space is constructed by arranging sheets made of magnetically shielding material and connecting the seams between the sheets with adhesive tape mixed with powdered magnetic material.