JPH06244580A - Radio wave absorptive board and its application structure - Google Patents

Abstract

PURPOSE:To obtain a light-weighted radio wave absorptive board which has thermal insulation properties and can be easily fixed to a building, by a method wherein a magnetic plate body and a radio wave reflecting body are unified in a body by using foam, and a board type body is constituted. CONSTITUTION:A magnetic plate body 26 is arranged a little inside the front of a case 10 made of radio wave reflecting material. Synthetic resin foam 28 reach around the side edge of the front surface of the magnetic plate body 26. Hence the synthetic resin foam 28 holds firmly the magnetic plate body 26 so as to envelop it. A T-shaped angle 38 is linked with an iron frame 32 of a building via angles 34, 36. A frange 22 of the radio wave absorptive board 1 is linked with the T-shaped angle 38 via bolts, and the radio wave absorptive board 1 is retained by the iron frame 32. Since the radio wave absorptive board 1 is constituted by unifying the magnetic plate body 26 and a stainless case 1 in a body with the resin foam 28, and the frange 22 is formed, the radio wave absorptive board 1 can be easily fixed to the ion frame.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio wave absorber which is a combination of a magnetic plate such as a ferrite plate and a radio wave reflector such as a metal plate, and a construction structure thereof. More specifically, the present invention relates to a radio wave absorber that is lightweight and has heat insulating properties, and its construction structure.

[0002]

2. Description of the Related Art A radio wave absorbing wall which is a combination of a ferrite plate and the like, and a radio wave reflector such as a metal plate, a reinforcing bar and a wire mesh is disclosed in Japanese Patent Publication No.
It is known in JP-A-5-13600 and JP-A-55-49798. These publications also describe that the surface of ferrite is covered with an exterior material such as mortar.

Further, Japanese Patent Publication No. 1-45238 discloses that
There is described a radio wave absorber in which a pair of leg-shaped protrusions are provided so as to project from the back surface of a decorative plate, and a ferrite plate is held between the protrusions.

[0004]

When constructing a conventional electromagnetic wave absorbing wall, a ferrite plate is constructed on the surface or inside of mortar or concrete, which requires a considerable amount of work. Also, ferrite plate and mortar,
There is also a problem that the attachment strength of the ferrite plate is low due to its poor adhesion to concrete. Further, since concrete or mortar is used, there is a problem that the weight of the wall of the building becomes large.

[0005]

According to a first aspect of the present invention, there is provided a radio wave absorber having a magnetic plate body, a radio wave reflector disposed so as to face a plate surface of the magnetic plate body, and the magnetic plate body and the radio wave reflection body. The foamed material is provided between the body and the body and is bonded to both.

According to a second aspect of the present invention, there is provided a radio wave absorber having a rectangular or square bottom surface and four side surfaces rising from four sides of the bottom surface, the case being made of a shallow box-shaped radio wave reflection material having an open front surface. The magnetic plate body is disposed on the front surface portion of the case, and the foamed material is provided between at least the bottom surface of the case and the magnetic plate body and is bonded to both of them.

A radio wave absorber according to a third aspect of the present invention is the radio wave absorber according to the second aspect, wherein the case has a rectangular shape, and a flange extends outward from a front edge of a pair of long side portions of the case. It is characterized by that.

According to a fourth aspect of the present invention, there is provided the radio wave absorber according to the third aspect, wherein a plurality of the magnetic plate members are continuously arranged between the side surfaces of the short side portion of the case. To do.

The radio wave absorber according to the present invention is defined in claims 1 to 4.
One of the electromagnetic wave absorbers is placed on the outer wall surface of the building so that the magnetic plate is on the outer surface side and attached to the steel frame of the building, and the decorative wall material is placed on the outer surface side of the electromagnetic wave absorber. It is characterized in that it is provided and supported by the steel frame.

[0010]

The radio wave absorber of the present invention is a disc-shaped body in which a magnetic plate and a radio wave reflector are integrated by a foam, and the magnetic plate is firmly held by the foam. . The foam of the electromagnetic wave absorber installed on the wall also functions as a heat insulating material.

The radio wave absorber of the present invention can be attached to a wall surface by simply attaching it to a steel frame with bolts, rivets or the like. Furthermore, mortar and concrete are not necessary for this installation work, and the wall weight of the building can be reduced.
Of course, since the radio wave absorber and the construction structure itself include foam, the weight per unit volume is small.

The radio wave absorber according to claim 2 can be easily manufactured by foaming the foam material in the case or by injecting the foam into the case. Also,
Since the outer shell other than the front surface of the radio wave absorber is formed as a single case, the radio wave absorber has high strength and rigidity. Furthermore, if the case is made of a water impermeable material such as a metal plate, the radio wave absorber will be extremely waterproof.

In the radio wave absorber according to the third aspect, the flange can be used to easily and firmly attach and fix to the steel frame of the building.

In the radio wave absorbers of claims 3 and 4,
The case is arranged on the wall surface of the building so that the longitudinal direction thereof is the vertical direction (vertical direction). Then, the magnetic plate bodies are continuously arranged in the vertical direction. Japanese Patent Publication 55-49798
As described above, the vertical direction (upside down) matches the direction of the magnetic field component of the incoming radio wave. As described in the same publication, if the magnetic plate member is continuous only in the direction of the magnetic field component, the radio wave absorption characteristic is hardly deteriorated even if the radio waves are arranged at intervals in the direction of the electric field component (horizontal direction).

If a flange is provided on the long side of the case as in claim 3, the flange exists only on the vertical side of the electromagnetic wave absorber, and no flange exists on the upper and lower sides of the electromagnetic wave absorber. Like As a result, the adjacent electromagnetic wave absorbers in the vertical direction can be arranged consecutively, and the electromagnetic wave absorption characteristics can be made sufficiently high.

In the construction structure of the radio wave absorber of the present invention, the radio wave absorber is covered with the decorative wall material, so that the appearance of the building is improved. Also, the radio wave absorber can be used as a heat insulating material.

[0017]

EXAMPLES Examples will be described below with reference to the drawings. FIG. 1 is a perspective view of a radio wave absorber 1 according to an embodiment, and FIGS. 2 and 3 are sectional views taken along lines II-II and III-III of FIG. 1, respectively.

The case 10 made of a vertically long rectangular radio wave reflection material (stainless steel in this embodiment) has a bottom surface 12 and four side surfaces 14, 16 and 1 rising from the four sides of the bottom surface 12.
8 and 20 have a shallow box shape with an open front. A flange 22 is projected outward from the side surfaces 16 and 20 along the long side, and an opening 24 for inserting a bolt is provided in the flange 22.

A magnetic plate 26 made of ferrite or the like is arranged along the front surface of the case 10. In the embodiment, the magnetic plate members 26 are arranged so as to be continuous in the vertical direction. The uppermost one of the rows of the magnetic plate bodies 26 that are continuous in the vertical direction is in contact with or close to the case side surface 14, and the lowermost one is in contact with the case side surface 18. In this embodiment, two rows of magnetic plates 26 in the vertical direction (hereinafter, may be simply referred to as magnetic plate rows) are provided, but one or three or more rows may be provided. There is a space between the magnetic plate rows and between the magnetic plate rows and the case side surfaces 16 and 20, respectively.

The case 10 is filled with a resin foam 28. In this embodiment, the resin foam 28 is a synthetic resin foam such as urethane, and is formed by supplying the raw material liquid into the case 10 and then heat-treating the foam. In this foaming process, the magnetic plate 26 is arranged along the front surface of the case, so that the foamed synthetic resin is bonded to both the magnetic plate 26 and the case 10. As shown in the figure, the back surface of the magnetic plate 26 is provided with irregularities (desirably, dovetail-shaped irregularities).
The binding force with 8 is extremely high.

In this embodiment, the magnetic plate 26 is the case 10.
Is disposed so as to slightly enter the case 10 from the front surface of the synthetic resin foam 28, and the synthetic resin foam 28 wraps around the side edge of the front surface of the magnetic plate 26, so that the synthetic resin foam 28 holds the magnetic plate 26. It is configured to hold firmly.

FIG. 4 is a horizontal sectional view showing an example of the construction structure of the radio wave absorber 1, in which the T-shaped angle 38 is connected to the steel frame 32 of the building through the primary and secondary angles 34 and 36. ing. The flange 22 of the radio wave absorber 1 is connected to the T-shaped angle 38 by a bolt, and the radio wave absorber 1 is supported by the steel frame 32. A large number of the radio wave absorbers 1 are continuously arranged in the vertical direction and are connected to the steel frame 32 as shown in FIG.

A decorative wall material 40, such as a tile or a stone material, is arranged at the front portion of each radio wave absorber 1 and is supported by a steel frame 32 by a fitting (not shown). Sealing material 44 supported to the T-shaped angle 38 via a bracket 42
Is filled in the joint gap between the decorative wall materials 40, 40. Although not shown, a fireproof coating such as asbestos is sprayed on the back surface of the radio wave absorber 1, the steel frame 32, and the angles 34, 36, 38.

In the radio wave absorber 1 constructed as described above, the magnetic plate member 26 and the stainless case 10 are made of resin foam 2.
8 and the flange 22 is provided, the radio wave absorber 1 can be easily attached to the steel frame. The resin foam 28 is lightweight and reduces the weight of the radio wave absorber 1 and also has a heat insulating function.

Since the case 10 of the radio wave absorber 1 is made of stainless steel, the radio wave absorber 1 has high strength and high rigidity, and is also excellent in corrosion resistance, water resistance and waterproofness.

Since the magnetic plates 26 are continuously arranged in the vertical direction and the radio wave absorbers 1 are continuously arranged in the vertical direction, the magnetic plates 26 are arranged over the entire wall surface of the building. It is arranged consecutively. Therefore, the radio wave absorption of the wall surface is also very good.

Moreover, since the magnetic plate 26 occupies only a part of the front surface of the case 10, the amount of the magnetic plate such as ferrite having a large specific gravity is small, and the weight of the radio wave absorber 1 is small. Therefore, the mounting mechanism of the radio wave absorber 1 can be simplified and the wall weight of the building can be reduced.

As shown in FIG. 4, in this construction structure of the electromagnetic wave absorber, since the decorative wall member 40 covers the front surface of the electromagnetic wave absorber 1, the appearance of the building is very good.

Although not shown, the magnetic plate 26 and the resin foam 28 are bonded by joining one end or a middle portion of the wire to the back surface of the magnetic plate 26 and embedding this wire in the resin foam 28. You may make it improve the bond strength with. A protrusion or a similar wire may be attached to the bottom surface 12 and the side surfaces 14 to 20 of the case 10 to enhance the bonding force between the case 10 and the resin foam 28.

The radio wave absorber of the present invention may be manufactured as follows. That is, the case 10 is installed so as to open upward, and the upper surface is covered with a magnet board. A magnetic plate body is magnetically attracted to the lower surface of the magnet board via a film. A resin liquid is supplied into the case, and heat-foaming is performed to integrate the case, the magnetic plate and the resin foam. After that, separate the magnet board and film,
The radio wave absorber of the present invention.

Although the resin foam is used in the above embodiment, an inorganic foam (for example, foam ceramics, foam glass, cement-based foam, gypsum-based foam, calcium silicate-based foam, etc.) may be used. good. Use of an inorganic foam increases heat resistance and fire resistance.

Although the case is made of stainless steel in the above embodiment, it may be made of other metal. Also, a conductive material such as conductive plastic may be used.

The radio wave absorber of the present invention can be applied to the curtain wall construction method.

[0034]

As described above, the radio wave absorber according to the present invention is lightweight and has heat insulating properties. Moreover, it can be easily installed on a building.

The radio wave absorber according to claim 2 has high strength and high rigidity and is easy to manufacture.

The radio wave absorber according to claim 3 can be mounted very easily by using the flange.

The radio wave absorber according to claim 4 has good radio wave absorption characteristics, and the weight of the radio wave absorber can be reduced by reducing the number of magnetic plates.

In the construction structure of the electromagnetic wave absorber of the present invention, since the electromagnetic wave absorber is covered with the decorative wall material, the appearance is good and the design of the building can be remarkably improved.

[Brief description of drawings]

FIG. 1 is a perspective view of a radio wave absorber according to an embodiment.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a sectional view taken along line III-II in FIG.

FIG. 4 is a horizontal sectional view showing a construction structure of a radio wave absorber.

[Explanation of symbols]

 1 Radio Wave Absorber 10 Case 12 Bottom of Case 14, 16, 18, 20 Side of Case 22 Flange 26 Magnetic Plate 28 Resin Foam 32 Steel Frame 40 Decorative Wall Material

Front page continuation (72) Masaki Sugimoto, Inventor Masaki Sugimoto 21-21 Ginza, Chuo-ku, Tokyo Stock company Takenaka Corporation Tokyo Main Store (72) Inventor Shinichi Nomura 8-2-1 Ginza, Chuo-ku, Tokyo Stock company Takenaka Corporation Tokyo Main Store (72) Inventor Takahiko Ando 5-1, Koi Ehonmachi, Tokoname City, Aichi Prefecture Inax Co., Ltd. (72) Inventor Hideo Iijima 5-1, Koi Ehonmachi, Tokoname City, Aichi Shares Inax Co., Ltd. (72) Inventor Makoto Senda 11-11 Torihama-cho, Kanazawa-ku, Yokohama, Kanagawa Tanaka Sash Industry Co., Ltd. (72) Inoue Bumpei 11-7 Torihama-cho, Kanazawa-ku, Yokohama-shi, Kanagawa Tanaka Sash Industry Co., Ltd.

Claims (5)

[Claims] 1. A magnetic plate, a radio wave reflector disposed so as to face the plate surface of the magnetic plate, and a material provided between the magnetic plate and the radio wave reflector and coupled to both. An electric wave absorber including a foamed body. 2. A rectangular or square bottom surface and four of the bottom surfaces.
A shallow box-shaped case made of a radio wave reflection material having four side surfaces rising from the side and an open front surface, a magnetic plate body arranged on the front surface portion of the case, at least a bottom surface of the case, and the magnetic plate. A radio wave absorber that is provided between the body and a foam that is bonded to both. 3. The electromagnetic wave absorber according to claim 2, wherein the case has a rectangular shape, and a flange projects outward from front edges of a pair of long side portions of the case. Board. 4. The electromagnetic wave absorber according to claim 3, wherein a plurality of the magnetic plate bodies are continuously arranged between the side surfaces of the short side portion of the case. 5. The electromagnetic wave absorber according to any one of claims 1 to 4 is arranged on an outer wall surface of a building so that the magnetic plate is on the outer surface side, and is attached to a steel frame of the building. A construction structure for a radio wave absorber, characterized in that a decorative wall material is arranged on the outer surface side of the board and is supported by the steel frame.