JPH1051176A - Magnetic shielding panel and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic shielding panel which has an excellent workability and an excellent magnetic shielding property. SOLUTION: A magnetic shielding panel is constituted of a magnetic shielding surface frame 1 made of soft magnetic material and an inner layer 2 which is made of non-magnetic material and is located inside the magnetic shielding surface frame 1. Parts of the magnetic shilding surface frame 1 which are located at the ends of the panel are formed into a recessed shape or a projecting shape in cross-sectional view, and the recessed section 6 and the projecting section 5 are set in with each other by insertion method and thereby the panels are connected. The magnetic shielding panel is manufactured by forming an upper frame 3 and a lower frame 4 separately, combining the two frames to form the magnetic shielding surface frame 1, and then filling the inside of the frame 1 with the inner layer 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic shielding panel and a method for manufacturing the same, and more particularly, to a magnetic shielding panel which is lightweight and can be installed with a small thickness, has excellent workability and magnetic shielding properties, and its manufacture. About the method.

[0002]

2. Description of the Related Art In recent years, with the enlargement of television screens and the spread of personal computers, there has been a problem of image damage due to external magnetic fields. A method of preventing a magnetic field from entering or a method of arranging a magnetic shielding material on each wall surface of a room or a building itself to prevent an external magnetic field from entering a room or a building itself has been adopted.

Here, the method of individually putting each device in a magnetic shielding box is a method that can be implemented relatively easily, but depending on the target device, there may be cases where sufficient performance and effects cannot be obtained in terms of function. In addition, there is a problem that the beauty of the working environment is impaired. In the latter case, that is, in the case of a method of applying a magnetic shielding material to a room or a building itself, it is necessary to attach the magnetic shielding material to each wall surface, and to perform a base construction for the purpose.
It must be a large-scale construction, and the construction period is long. In addition, in order to prevent the occurrence of magnetic field leakage from the end of the magnetic shielding material, a special construction method has been devised, such as superposing the magnetic shielding materials or arranging them in a staggered manner. For that purpose, it was necessary to perform troublesome assignment of magnetic shielding material parts, site management by engineers having technical knowledge on magnetic shielding, and construction by skilled craftsmen. Further, the conventional mounting of the magnetic shielding material on the wall surface occupies a considerable thickness portion including the necessary underlaying portion and the like, so that there is a problem that the room space is narrowed accordingly.

[0004] In order to solve the above-mentioned problems in the conventional method of applying a magnetic shielding material to a room or a building itself, a proposal has been made to simplify the construction work by panelizing the magnetic shielding material. Japanese Patent Application Laid-Open No. Hei 4-209599 discloses a panel frame, a pair of surface plates that are engaged with both peripheral edges of the panel frame to cover both sides of the panel frame, and a strong plate fixed inside at least one of the surface plates. A magnetic shielding panel comprising a magnetic sheet and a resin core formed by foaming in a panel frame is disclosed. Japanese Utility Model Application Laid-Open No. 6-13197 discloses that one surface of a plate-shaped core material made of foamed urethane is covered with a shield material made of a copper-plated steel plate, and the other surface is made of a shield material made of a high magnetic permeability material permalloy. Covering, and shield panel provided with a copper-plated steel plate on the end face of the core material, and abutting the ends of these shield panels, copper-plated steel plate at the abutting portion,
A panel connection structure for connecting using a strip covered with permalloy is disclosed.

In each of the panels proposed above, when the ends of the panels themselves are simply butted against each other, the magnetic shielding members constituting the panels are not in contact with each other in a state of being overlapped in a direction perpendicular to the panels. However, in order to prevent the magnetic leakage from the butted portion, it is necessary to bridge and connect the both ends with a separately prepared shield member.

[0006]

SUMMARY OF THE INVENTION In view of the above, it is an object of the present invention to provide a magnetic shielding panel which is lightweight and can be installed with a small thickness, has excellent workability and magnetic shielding properties, and a method of manufacturing the same. That is. It is a further object of the present invention to provide a magnetic shield panel which enables panel joining such that the occurrence of magnetic field leakage from the butted portion can be prevented by merely butting the ends of the panel.

[0007]

According to the present invention, as a magnetic shielding panel for solving the above-mentioned problems, a magnetic shielding surface frame made of a soft magnetic material and a non-magnetic material disposed inside the magnetic shielding surface frame are provided. We propose a magnetic shield panel composed of an inner layer consisting of: The cross-sectional shape of the end portion of the magnetic shielding surface frame located at the end of the magnetic shielding panel is configured to be convex, concave, stepped, or oblique. The cross-sectional shape of the end portion of the magnetic shielding surface frame is configured in such a shape, and for example, the convex end or the concave end of the panel to be connected when connecting the panels is replaced by the concave end or the convex end of the mating panel. The telescoping engagement with the shaped ends constitutes a superimposed connection of the magnetic shielding facing in a direction perpendicular to the panel surface. Therefore, since the connecting portions of the magnetic shielding panel thus connected are magnetically connected with a low magnetic resistance, the occurrence of magnetic leakage is minimized without attaching special magnetic circuit parts to the connecting portions. Connected in state. Even when the cross-sectional shape of the end portion of the magnetic shielding surface frame is configured to be stepped or oblique, the magnetic shielding surface material is similarly brought into contact by overlapping the magnetic shielding surface material at the connecting portion of the panels. Since the connection can be performed in a state where the magnetic resistance of the connection portion of the shielding panel is reduced, the connection can be performed in a state where the occurrence of magnetic leakage is minimized without attaching a special magnetic circuit component to the connection portion.

In the present invention, as the soft magnetic material constituting the magnetic shielding surface frame, a high magnetic permeability material such as iron, silicon steel plate, amorphous alloy, permalloy, or a composite thereof is used as the soft magnetic material. It is selected and adopted according to the strength or its frequency. When the strength of the magnetic field to be shielded is large, it can be dealt with by using a frame material having a large saturation magnetic flux density or a magnetic shielding surface frame material having a large thickness. Alternatively, it can be dealt with by disposing a middle plate made of a high-permeability magnetic material inside the magnetic shielding surface frame.

As the inner layer made of a non-magnetic material, foams such as foamed resin and foamed concrete, plywood, wood powder pressed board, plastic board, lightweight board such as plaster board, calcium silicate board and gypsum board, or paper honeycomb, A honeycomb material such as an aluminum honeycomb is used. By adopting these inner layers, the magnetic shielding panel itself can be made thin and light, so that the panel end work described above facilitates panel connection, and thus the panel mounting work. Will be easier.

[0010] The magnetic shielding panel of the present invention comprises an upper frame portion of the magnetic shielding surface frame including portions forming both end surfaces of the magnetic shielding panel, and a magnetic shielding surface frame including portions forming both end surfaces of the magnetic shielding panel. A frame forming step of forming a lower frame portion, a frame forming step of combining the upper frame portion and the lower frame portion to form a magnetic shielding surface frame, and an inner layer material made of a non-magnetic material inside the framed magnetic shielding surface frame And is easily manufactured by an inner layer forming step of forming an inner layer.

[0011]

FIG. 1 shows an example of a magnetic shielding panel according to the present invention. In the magnetic shield panel 10 shown in FIG. 2, the protrusion 5 is formed at one end of the magnetic shield surface frame 1, and the recess 6 is formed at the other end. Also in the case of this example, the magnetic shielding surface frame 1 is formed and combined so that the upper frame 3 and the lower frame 4 are overlapped at the ends, that is, at the tip of the convex portion and the bottom of the concave portion. As a material of the magnetic shielding surface frame 1, a high magnetic permeability material such as iron, silicon steel plate, amorphous, or permalloy is selected and adopted according to the purpose. Further, these can be used in combination. However, when using permalloy, it is desirable to perform heat treatment after molding.

FIG. 2 shows, as an example of a magnetic shielding panel applied to shielding of a strong magnetic field, an example of a panel in which an intermediate plate 7 made of a high-permeability magnetic material is disposed inside a magnetic shielding surface frame. FIG. 2 (a) shows a case in which one middle plate 7 is provided inside the upper frame in contact with the frame, and FIG. 2 (b) shows two middle plates on the upper frame side and one middle plate on the lower frame side. (C) shows a case where one intermediate plate is provided in the middle.

FIG. 1 shows an example of a magnetic shielding panel in which a convex portion 5 is formed at one end of a magnetic shielding surface frame 1 and a concave portion 6 is formed at the other end. The end shape of the shielding panel is not limited to this, and various end shapes are possible. FIG. 3 shows an example of the end shape of the magnetic shielding panel of the present invention. (A) of FIG. 3 is rectangular unevenness, (b) is trapezoidal unevenness,
(c) is stepped, (d) is triangular irregularities, (e) is a slope, (f)
Shows an example of the end shape of the central trapezoidal unevenness.

In FIG. 4, the magnetic shielding panel 11 is configured such that an inner layer material 2 made of a non-magnetic material is surrounded by a magnetic shielding surface frame 1 made of a soft magnetic material. The magnetic shielding surface frame 1 is configured by combining the upper frame 3 and the lower frame 4 such that at least the ends overlap.

The ends of the upper frame and the lower frame of the magnetic shielding surface frame 1 are overlapped and combined at the end positions of the panel to form the magnetic shielding surface frame 1. Further, it is preferable that the end shape of the panel is a shape in which one end is received by the other end and connected, and by doing so, for example, each panel (a) shown in FIG. (b), (c), (d),
(e) and (f) are (a), (b), (c), (d), (e), and (f) in FIG. 5, respectively.
Are connected as shown in FIG. Therefore, in the connecting portion, the two magnetic shielding surface frames of the one magnetic shielding panel and the magnetic shielding surface frame of the other magnetic shielding panel are connected to each other in such a manner that they have portions that overlap each other in a direction perpendicular to the panel surface.

Generally, in order to prevent magnetic leakage from the connecting portion of the magnetic shielding material, as shown in FIG. 10A, the widthwise end portion of the adjacent magnetic shielding material is perpendicular to the surface of the shielding material. It is extremely important that the magnetic shields are overlapped or that the magnetic shielding members are arranged in a staggered manner as shown in FIG. In the case of the magnetic shielding panel of the present invention,
As shown in FIG. 5, the magnetic shielding surface frame itself is overlapped and connected at the connecting portion, so that magnetic leakage from the connecting portion is effectively prevented. Therefore, it is not necessary to attach a special member for preventing magnetic leakage from the connecting portion to the connecting portion, and the mounting of the magnetic shielding panel exhibiting good magnetic sealing characteristics is facilitated.

In particular, the shape of the end of the magnetic shielding panel is
For example, as shown in (a), (b), (d), and (f) of FIG. 5, when forming into a convex shape and a concave shape, the ends can be connected in a nested manner and connected. In addition to obtaining a good magnetic leakage effect, it is effective in reducing the number of construction steps.
In the case of performing magnetic shielding work using the magnetic shielding panel of the present invention, it is not necessary to install a base, and a finished cloth can be directly adhered to the panel by closing the panel connecting portion with a putty or a caulking material. Therefore, the space required for the construction is small, and the effective space of the building or the room is not narrowed by the construction.

A method of manufacturing the magnetic shield panel of the present invention will be described with reference to FIGS. Upper frame portion 3 of the magnetic shielding surface frame including portions 15 and 16 forming both end surfaces of the magnetic shielding panel, and portion 1 forming both end surfaces of the magnetic shielding panel
The lower frame portion 4 including the magnetic shielding surface frame including 5 'and 16' is formed. Next, the upper frame portion 3 and the lower frame portion 4 are combined to form the magnetic shielding surface frame 1, and the inner layer portion 2 made of a non-magnetic material is inserted between them (FIG. 6 (a)) or the lightweight plate layer 22. Alternatively, the magnetic shielding panel can be manufactured by forming the magnetic shielding surface frame 1 incorporating the honeycomb plate layer 23 (FIGS. 6B and 6C). When permalloy is used as the material of the magnetic shielding surface frame, heat treatment is performed after molding.

In order to obtain a magnetic shielding panel in which an intermediate plate made of a soft magnetic material is added to the inside of the magnetic shielding surface frame 1 in order to improve the magnetic shielding performance, as shown in FIG. And / or loading the inner layer after assembling the middle plate 7 to be added inside the lower frame (the lower frame 4 in FIG. 7) in advance. In order to obtain a magnetic shielding panel having a middle plate in the middle of the inner layer as shown in FIG. 2 (c), the inner layer is previously loaded on one of the upper frame and the lower frame, and the middle plate is placed on the inner layer. After the mounting, the upper frame and the lower frame can be combined, and a necessary inner layer can be further loaded therein.

Since the middle plate 7 may be a flat plate type, and it is not necessary to perform a special bending process or the like, the increase in processing cost is small even when the number of stacked middle plates is large. Further, according to the above method, it is possible to manufacture a thin panel having a thickness of about 20 to 30 mm, which is effective in improving the workability of mounting the panel and reducing the work space.

[0021]

Example 1 2000 mm (l) × 450 mm (w) ×
A magnetic shielding panel having a size of 30 mm (t) and a cross-sectional shape shown in FIGS. With the two panels connected, the longitudinal direction was set to be vertical, and the magnetic field shielding performance was measured at the center position (the connection position of the panels).
As a magnetic shielding material, an Amoric G sheet, which is a composite material of a silicon steel sheet and an Amoric A sheet, was used, and a three-sheet configuration including upper and lower surface frames and one middle plate was used. Amoric A sheet: Co-based amorphous alloy flakes (5 to 100 μm thick, aspect ratio: 10 to 15000), which are high magnetic permeability materials, are dispersed at a rate of 250 g / m between pet films having a thickness of about 25 μm. A sheet with a thickness of about 0.5 mm sandwiched (Japanese Patent Publication No. 1-47040)
issue). Amolic G sheet: A sheet made by attaching an Amolic A sheet to a silicon steel sheet.

Referring to FIG. 8, an experimental method for performance evaluation will be described. Using a solenoid coil 31 as a magnetic field generation source and supplying current from an AC stabilized power supply 32 to 50 MHz
To generate an AC magnetic field. An AC Gauss meter 33 is used as a sensor, and its tracing stylus 34
Installed at a distance of 0cm, and at that position 0-200mG
The coil current amount was adjusted so that the magnetic field of (1) was detected. The measurement was performed by placing the sample at a position 30 cm away from the coil. Also, for comparison with the conventional method, 2000
A staggered three sheets of an Amolic G sheet 50 laminated on a plywood 40 mm (l) × 900 (w) (FIG. 9 (a)),
As a comparative example in the case where the magnetic bonding is insufficient, the magnetic shielding performance was measured on the plywood 40 of the same size with the seam abutted on the plywood 40 (FIG. 9 (b)) under the above conditions. I did it.

FIG. 11 shows the measurement results. Magnetic shielding panel
The magnetic shielding performances of (a), (b), (c), (d), (e), and (f) fall within the hatched portions in FIG. The performance is the same as that of the conventional staggered lamination (FIG. 9A). Furthermore, despite the fact that each panel is measured at the joint, the performance is the same as that of the conventional staggered lamination, so the magnetic connection at the joint of each panel of the present invention is in an extremely good state. It is understood that this is done in.

[0024]

Embodiment 2 2000 mm (l) × 450 (w) × 30
Two magnetic shield panels having the cross-sectional shape shown in FIG. 3A and having the size of (t) were prototyped, and the same measurement as in Example 1 was performed. However, one panel uses a total of three magnetic shielding plates (Amoric G sheet), one upper and lower surface frame and one middle plate, and the other panel has three upper and lower surface frames and three middle plates. A total of 5
Two magnetic shielding plates (Amoric G sheet) were used. 2000mm (l) x 900 for comparison with the conventional method
The plywood of (w) was prepared by laminating three and five Amoric G sheets in a staggered pattern under the same conditions. FIG. 12 shows the measurement results. From the graph of FIG. 12, the magnetic shielding performance of the magnetic shielding panel of the present invention is the same as that of the conventional zigzag type lamination method in each of the three-sheet configuration and the five-plate configuration. It was confirmed that the shielding performance was improved by increasing the number of sheets as in the case of the conventional method.

[0025]

The magnetic shielding panel of the present invention can be made lightweight and can be easily connected, so that the construction can be facilitated and the number of construction steps can be reduced. In addition, when the magnetic shield panel of the present invention is used, magnetic connection is effectively performed at the time of connection, so that construction excellent in magnetic shield performance can be performed. In addition, when the magnetic shielding panel of the present invention is used, compact construction is possible, so that the room space is not narrowed by the construction as in the related art.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating another example of a magnetic shielding panel according to the present invention.

FIG. 2 is a cross-sectional view showing an example of a magnetic shielding panel according to the present invention, showing an insertion state of a middle plate.

FIG. 3 is a cross-sectional view illustrating an end shape of the magnetic shielding panel of the present invention.

FIG. 4 is a cross-sectional view showing an example of the magnetic shield panel of the present invention.

FIG. 5 is an explanatory diagram illustrating a connected state of the magnetic shielding panel of the present invention.

FIG. 6 is an explanatory view illustrating a method for manufacturing a magnetic shielding panel of the present invention.

FIG. 7 is an explanatory view illustrating a method of manufacturing a magnetic shielding panel according to another example of the present invention.

FIG. 8 is an explanatory diagram illustrating a test method for comparing the magnetic shielding performance of the magnetic shielding panels.

FIG. 9 is a sectional view of a comparative sample.

FIG. 10 is an explanatory view illustrating a conventional method of connecting magnetic shielding materials.

FIG. 11 is a graph showing the results of a magnetic leakage comparison test of Example 1.

FIG. 12 is a graph showing the results of a magnetic leakage comparison test of Example 2.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Magnetic shielding surface frame 2 Inner layer 3 Upper frame 4 Lower frame 5 Convex part 6 Concave part 7 Middle plate 22 Lightweight plate 23 Honeycomb plate 40 Plywood 50 Amoric G sheet

Continued on the front page (72) Inventor Takeshi Ishibashi 1-3-1 Uchisaiwaicho, Chiyoda-ku, Tokyo Tokyo Electric Power Company (72) Inventor Hiroaki Yoshizawa 1-3-3 Uchisaiwaicho, Chiyoda-ku, Tokyo Tokyo Electric Power Stock In company

Claims (7)

[Claims] A magnetic shielding surface frame made of a soft magnetic material;
A magnetic shielding panel comprising an inner layer made of a non-magnetic material disposed inside the magnetic shielding surface frame. 2. A magnetic shielding surface frame made of a soft magnetic material includes an upper frame portion of a magnetic shielding surface frame including portions constituting both end surfaces of a magnetic shielding panel and a portion constituting both end surfaces of the magnetic shielding panel. 2. The magnetic shielding panel according to claim 1, comprising a lower frame portion of the magnetic shielding surface frame. 3. The soft magnetic material according to claim 1, wherein the soft magnetic material is iron, silicon steel plate,
3. The magnetic shielding panel according to claim 1, wherein the magnetic shielding panel is made of a high magnetic permeability material such as an amorphous alloy, permalloy, or a composite thereof. 4. The medium according to claim 1, wherein an intermediate plate made of a high-permeability magnetic material is provided inside the magnetic shielding surface frame.
The magnetic shielding panel according to any one of the above. 5. The inner layer made of the non-magnetic material is made of foam such as foamed resin or foam concrete, plywood, wood powder pressed board, plastic board, light board such as plaster board, calcium silicate board, gypsum board, or paper. The magnetic shield panel according to any one of claims 1 to 4, which is a honeycomb material such as a honeycomb or an aluminum honeycomb. 6. The magnetic shielding surface frame according to claim 1, wherein an end portion of the magnetic shielding surface frame located at an end of the magnetic shielding panel has a sectional shape of a convex shape, a concave shape, a step shape, or an oblique shape. Magnetic shielding panel. 7. An upper frame portion of the magnetic shielding surface frame including portions forming both end surfaces of the magnetic shielding panel, and a lower frame portion of the magnetic shielding surface frame including portions forming both end surfaces of the magnetic shielding panel. A frame forming step, a framing step of combining the upper frame portion and the lower frame portion to form a magnetic shielding surface frame, and loading an inner layer material made of a non-magnetic material inside the magnetic shielding surface frame that has been framed to form an inner layer. Method of manufacturing magnetic shield panel having inner layer forming step of forming