JPH03220278A - Magnetically shielded room using adhesives and adhesives - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an adhesive for arranging and connecting sheets of magnetic shielding material and a magnetic shielding rim using the adhesive.

[Conventional technology = When detecting a weak magnetic field from a living body in the medical field: Well, 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, magnetic steel sheets, silicon steel sheets, or permalloyed flat wooden boards. It is constructed using a magnetic shield panel to which a sheet with magnetic unwrapping properties such as .

FIG. 9 is a diagram showing an example of the configuration of a conventional magnetically shielded room using permalloy. Reference numeral 41 indicates a partition, 43 and 47 indicate nails, 44 indicates a panel, 45 indicates permalloy, and 46 indicates a covering material.

A conventional magnetically shielded room using permalloy, for example, as shown in FIG. The attachment is done so as to cover the gap that occurs between the parts and the abutting parts of the permalloy 45.

[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. Safety measures, costs, etc. are issues.

Permalloy has high magnetic permeability and can be made thin to ensure magnetic shielding performance, but permalloy has various problems when manufactured as a sheet of magnetic shielding material. This is because, for example, large-sized products are more likely to have variations in manufacturing dimensions than steel plates.

Furthermore, when mechanical or thermal stress is applied, the performance deteriorates significantly. If additional processing such as girders and holes are added, it must be annealed in a hydrogen atmosphere furnace. However, when using Unipermalloy as a shielding material as shown in Figure 9, flat wooden panels 4
In order to attach permalloy 45 to 4, it is necessary to make a hole through which a nail 43 or screw can pass. However, when holes are drilled on-site, the surrounding permalloy is distorted.
If annealing is not performed, the shielding performance will be significantly reduced. Therefore, at construction sites where annealing is not possible, even if you try to attach a permalloy sheet to a flat wooden board, it will not be possible to drill holes at the construction site.)

Therefore, after drilling a hole at a construction site, in order to maintain a certain level of shielding performance, it is necessary to return the hole to the factory or the like and anneal it again, which increases time and cost.

Furthermore, if a hole is made in permalloy, magnetic leakage from that part becomes a problem. Therefore, it is necessary to cover the plates with a covering material 46 after pasting the permalloy.

However, nails 47 or screws are also used to attach this covering material 46.

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

In addition, because there is a gap where the permalloy plates meet and a magnetic closed circuit is not formed, a band-shaped metal sheet is glued in the gap and pressure is applied to increase the adhesive effect between the metals. ing. As a result, the application of force causes deterioration in performance due to stress as described above.

) In particular, when repairing ceilings and walls, it is difficult to apply pressure evenly to improve the adhesive effect.

The present invention solves the above-mentioned problems, and aims to provide an adhesive and a magnetically shielded room using the adhesive, which eliminates the need for on-site drilling and processing and prevents deterioration of performance. It is something.

[Means to solve the problem]

To this end, the present invention is characterized in that the sheets of magnetic shielding material constituting the magnetic shielding room are arranged, and the adhesive that connects the sheets is mixed with a powdered magnetic material. In addition, magnetic shielding using adhesive is characterized by arranging sheets of magnetic shielding material and connecting the sheets using adhesive to form a magnetically shielded space. It is characterized by adhering a covering material or using an adhesive mixed with powdered magnetic material without using a covering material. Furthermore, it is characterized in that a sheet having magnetic shielding performance is adhered onto a panel in advance with an adhesive to form a unit, and the unitized panels are connected.

[Effect]

Adhesive and magnetic seal with magnetic shielding performance of the present invention In the r' room, an adhesive mixed with a powdered magnetic material is used5), and the gap between the sheets of magnetic shielding material is overturned).
Since the sheets are connected, the magnetic path is connected through the adhesive, and the problem of magnetic leakage can be solved. In addition, there is no need to drill holes to install the seat, so it is easy to install.
Productivity improves. Furthermore, by bonding a sheet to the panel to form a unit, it is possible to improve workability.

〔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 an adhesive according to the present invention, in which 1 indicates a stud, 2
3 is a scrap, 3 is a nail, 4.6 and 10 are adhesives, 5 is a panel, 7 and 8 are permalloy, and 9 is a covering material.

In FIG. 1, the panel 5 is, for example, a wooden board that does not have magnetic shielding performance, and its surface is covered with Pamalloy 7.8 to ensure magnetic shielding performance. The permalloy 7.8 is bonded to the panel 5 in advance by pressing, for example, using an epoxy adhesive 6, and the permalloy 8 is used to cover the seam of the permalloy 7.

In this way, the panel 5 and permalloy 7.8 are made into a unit, and after fixing the rice cake 2 to the stud 1 with nails 3 or screws, the panel 5 is attached to the waste rice cake 2 with adhesive 4.

The nails 3 and screws are made of, for example, non-magnetic stainless steel, brass, or phosphor bronze, and have flat heads. Further, when arranging the panels 5 to form a wall, ceiling, etc., a covering material similar to the permalloy 8 is used, although not shown. This installation is done on-site using adhesive.
During the curing period, cover with duct tape, etc.

Next, a method for constructing a magnetically shielded room using the adhesive of the present invention will be explained.

2 to 4 are diagrams for explaining the method of constructing a magnetically shielded room according to the present invention, in which (a) is a sectional view from above and (a) is a front view.

When constructing a magnetically shielded room using the adhesive of the present invention, first, as shown in FIG. 2, adhesive 6 is applied to panel 5, and permalloy sheets 7 are arranged on top of it. Further, the joint portion of the permalloy sheet 7 is covered with a permalloy covering material 8 and bonded with an adhesive 6. Then, it is pressed and cured using a press. When making a unit of multiple pieces of magnetically shielded bisailles made in this way,
The gaps between the panels are also covered with permalloy covering material and glued together.

In the construction process (on-site), as shown in Figure 3, adhesive 4 is applied on top of the temporary beam 2, and a magnetic shielding panel unit consisting of a previously prepared panel 5 and permalloy sheet 7.8 is placed on top of the adhesive 4. Attach.

Furthermore, as shown in FIG. 4, the gaps between the panels 5 are covered with a permalloy covering material 9 and bonded with an adhesive 10. Then, it is pressed down with duct tape or the like and cured for a predetermined period of time.

Construct the walls, ceiling, and floor of the magnetically shielded room using the steps above.

FIG. 5: is a diagram showing the configuration of a connection part of a magnetic shield panel using an adhesive, and FIG. 6 is a diagram for explaining the procedure for manufacturing a magnetic shield panel using an adhesive. In the figure, 2
2 is permalloy, 23 and 25 are covering materials, 26 is wood board, 2
7 indicates a gap.

In the magnetic shielding panel of the present invention, as shown in FIG.
In addition to 3, as shown in FIG. 3(b), a covering material 25 for the mating portion of the covering material 23 is also required. That is, Fig. 6 (a
) to (C), a plurality of permalloy sheets 22 are arranged on the wooden board 26, and as shown in (d) and (e) of the same figure, after arranging the band-shaped covering material 23 in the gap, further As shown in (f), the mating portion of the covering material 23 is covered with the covering material 25. However, if an epoxy adhesive that does not have magnetic shielding properties is used as the adhesive, it may be covered with a permalloy covering material from above. However, the magnetic shielding performance deteriorates because the magnetic path connection between the permalloys is insufficient.

Therefore, another embodiment of the present invention that can prevent the above-mentioned performance deterioration will be described.

FIG. 7 is a diagram for explaining another embodiment of the magnetically shielded room according to the present invention, and FIG. 8 is a diagram for explaining the manufacturing procedure. In the figure, 31 is permalloy, 32 is adhesive,
33 indicates a panel.

In FIG. 7, permalloy 31 is used as a shielding material for ceilings, floors, walls, etc., and is arranged according to the size of the shielding surface. The adhesive 32 is an epoxy or silicone adhesive mixed with powdered magnetic material, and is used to cover the gap between the permalloys 31 (5) and prevent magnetic leakage at the connection of the permalloys 31. be. When there is a magnetic material, a magnetic field is formed by a magnetic path that passes through the magnetic material with low magnetic resistance, but if the magnetic material is not continuous, the magnetic resistance increases in the intermittent gaps, causing space to flow. It will leak. If an adhesive mixed with powdered magnetic material is used in the gap between the Permalloy 31 as described above, the connection between the two sheets will be as shown in Figure 7(a), and the connection between the four sheets will be as shown in Figure 7(b). Since the gap can be covered with a cover material, it is possible to prevent the magnetic shielding performance from deteriorating in the gap without using a covering material. FIG. 8 shows an example of the procedure for manufacturing the magnetic shield panel.

In FIG. 8, the panel 33 is made of a wooden board (for example, a base plate) and does not have magnetic shielding properties, and when constructing a shield panel, the panel 33 (b) is
As shown in (C), a sheet of permalloy 31 is pasted on. Then, adhesive 32 is embedded in the gaps created between the sheets of permalloy 31, as shown in FIG. In this case, unitize in advance as shown in FIG. 8(d),
Arrange these units on site and fill the gaps between the units with adhesive 3.
2 may be used to embed them.

Note that the present invention is not limited to the above embodiments, and various modifications are possible. For example, in the above embodiment, the sachet 2 is fixed to the stud 1, and the permalloy 7.
Although the panel 5 to which the permalloy 7.8 is glued is attached, the permalloy 7.8 may be directly glued to the sachet 2 without using the panel 5.

In addition, when using an adhesive mixed with ferromagnetic powder,
Since it is a paste and can be easily molded, it can be used not only as an adhesive, but also as a filler to repair holes used for measurements or ventilation holes when they are no longer needed, or as a corner etc. It may also be used to fill gaps created by injection.

In a magnetically shielded room, if there is a partial defect in the magnetic shielding performance, magnetic leakage will occur from that area. The adhesive of the present invention can also be used for repairing and reinforcing such defective parts.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, since an adhesive is used, there is no need to make holes on site, and the trouble of making holes and deterioration of permalloy can be eliminated. What's more, there is no need to misalign holes on site, and workability can be improved by gluing permalloy sheets onto flat wooden boards to form panels. Furthermore, since the heads of nails and screws are not on the surface, it is possible to use flat covering materials. In addition, since it is an adhesive, it is paste-like and can be easily molded, it can be injected into small gaps, there is little deterioration due to the stress of mixed powder), and there is little deterioration due to the stress of the adhered object. It has excellent effects such as easy curing. In particular, since it can be deformed freely, it can be adapted to any shape and can be embedded even on uneven surfaces and corners.
It has the effect of not applying stress to materials to be bonded such as base metal. Also, since powdered magnetic material is mixed into the adhesive,
Deterioration of magnetic shielding performance due to stress of mixed powder and stress of the adhered object can be reduced.

[Brief explanation of drawings]

FIG. 1: A diagram for explaining one embodiment of a magnetically shielded room using the adhesive according to the present invention, FIGS. 2 to 4 are diagrams for explaining a method for constructing a magnetically shielded room, (a) is a cross-sectional view from above, the figure is a front view, and the fifth figure is a cross-sectional view from above.
The figure shows the configuration of the connection part of a magnetic shield panel using adhesive, Figure 6 is a diagram explaining the procedure for manufacturing a magnetic shield panel using adhesive, and Figure 7 shows the magnetic shield panel according to the present invention. Diagrams for explaining other embodiments of the shield room,
FIG. 8 is a diagram for explaining the manufacturing procedure, and FIG. 9 is a diagram showing an example of the configuration of a conventional magnetically shielded room using permalloy. ■...Studs, 2...Support beams, 3...Nails, 4.6 and 10...1 adhesive, 5...Panels, 7.8 and 22...
Permalloy, 9.23 and 25...covering material, 26...
Wooden board, 27... gap. Applicant: Shimizu Corporation Sub-Agent

Claims (5)

[Claims] (1) An adhesive which arranges sheets of magnetic shielding material constituting a magnetically shielded room and connects the sheets, and which has magnetic shielding properties and is characterized by being mixed with a powdered magnetic material. (2) A magnetically shielded room using an adhesive, characterized in that sheets of magnetically shielding material are lined up and the sheets are connected using an adhesive to form a magnetically shielded space. (3) A magnetically shielded room using the adhesive according to claim 2, wherein a covering material made of the same material is adhered to the joints of the sheets. (4) A magnetically shielded room using an adhesive according to claim 2, characterized in that the adhesive contains a powdered magnetic substance. (5) The adhesive according to any one of claims 2 to 4, characterized in that a sheet having magnetic shielding performance is bonded onto a panel in advance with an adhesive to form a unit, and the unitized panels are connected. A magnetically shielded room was used.