JP3010161B1 - Electromagnetic wave shielding unit panel and method of manufacturing the same, and electromagnetic wave shielding structure and method of manufacturing the same - Google Patents

Abstract

To easily form a flat surface without projections or distortion as a wall, ceiling or floor in an electromagnetic wave shielding room or an anechoic room, and to eliminate the need for a member for supporting a unit panel. . A unit panel (1) has a bent portion (1) bent at each end of four sides in an L-shape in the same direction.
1 and frame members 21 and 22 joined to respective ends of four sides of the electromagnetic wave shielding plate 10 so as to be in contact with the bent portion 11 of the electromagnetic wave shielding plate 10, and extend in the longitudinal direction. And an auxiliary frame member provided so as to connect the two frame members 21 facing each other. The frame members 21 of adjacent unit panels 1 are mechanically connected by bolts 25 and nuts 26, and the bent portions 11 are electromagnetically connected by welding.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an electromagnetic wave shielding room in which the whole room is covered with an electromagnetic wave shielding material or an entire room is covered with an electromagnetic wave shielding material, and a radio wave absorber is provided at least partially inside the electromagnetic wave shielding material. A wall in the provided anechoic chamber, an electromagnetic wave shielding unit panel for constructing a ceiling or a floor and a method of manufacturing the same, and a wall, ceiling or floor in the electromagnetic wave shielding room or an anechoic chamber constructed by the electromagnetic wave shielding unit panel The present invention relates to an electromagnetic wave shielding structure used and a method for manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, antenna tests and E
MC (Electro Magnetic Compatiblity)
An anechoic chamber is used for tests and the like. The anechoic chamber covers the entire room with an electromagnetic wave shielding material to shield the room from electromagnetic waves (also referred to as a shield).
A radio wave absorber is provided on a wall surface or a ceiling surface of a room to prevent reflection of a radio wave by the wall surface or the ceiling surface. Further, an electromagnetic wave shielding room in which the entire room is covered with an electromagnetic wave shielding material to shield the electromagnetic waves is also used for applications such as an electronic control room and a measurement room where it is necessary to prevent the influence of electromagnetic waves from outside.

Conventionally, in the above-described anechoic chamber or electromagnetic wave shielding chamber (hereinafter referred to as an anechoic chamber or the like), electromagnetic shielding of the entire room is performed by mounting an electromagnetic shielding plate, which is a plate made of an electromagnetic shielding material, on a ceiling, It is performed by arranging a plurality of sheets on the wall and the floor, and electromagnetically connecting adjacent electromagnetic wave shielding plates. Hereinafter, a method of electromagnetically connecting adjacent electromagnetic wave shielding plates is referred to as a shielding method.
Note that a steel plate is usually used for the electromagnetic wave shielding plate.

Conventional shield methods include a soldering method, a fastener tightening method, and a welding method. The soldering method is a method of connecting adjacent electromagnetic wave shielding plates by soldering. The fastener fastening method is a method in which adjacent electromagnetic wave shielding plates are fastened and connected by a fastener (fastener). The welding method is a method of connecting adjacent electromagnetic wave shielding plates by welding.

[0005] Each of these shield methods has its own characteristics and is used depending on the case. However, among these shield methods, the welding method is superior in durability, and has been widely adopted as a shield method in an anechoic chamber.

The welding method includes a method of welding between electromagnetic wave shielding plates in a plate shape at a construction site such as an anechoic chamber (hereinafter referred to as a field welding method), and a method of using electromagnetic shielding plates in a factory or the like in advance. A method of forming a unit panel in which one surface of a hexahedral box or hexahedral box is opened, arranging a plurality of panels on a wall or the like at a site, and welding the unit panels. (Hereinafter, it is called a welding panel method.)

[0007] A technique for constructing an anechoic chamber or the like using a unit panel in which one surface of a hexahedral box is open is disclosed in, for example, Japanese Patent Application Laid-Open No. 9-260889. In this technique, an outer end of a metal plate having excellent conductivity is bent into an L-shape or an arc to form a bent portion, and a frame is installed at a position inside the vicinity of the bent portion to form a unit panel. Form. Then, the frames of the plurality of unit panels are connected with a joint material to surround the room, and a C-shaped joint formed between adjacent bent portions of the metal plate is joined by welding to form an anechoic chamber. Constitute.

The above-mentioned unit panel is often attached to a building that houses an anechoic chamber having an electromagnetic wave shielding function, or attached to a frame made of steel frame material.

As a technique for constructing an anechoic chamber or the like using a unit panel, there is another technique disclosed in Japanese Patent Laid- Open No. 7-45988.
There is a technique disclosed in Japanese Patent Publication No. In this technique, a core member is formed of a structural member, an outer wall is attached to one surface of the core member, and an electromagnetic wave shielding plate is attached to the other surface to form a unit panel. Then, this unit panel is connected to a frame of a structure such as a pillar, a beam, a roof, or the like via a mounting bracket, and adjacent panels are connected to each other.

[0010]

Conventionally, there have been the following various problems in forming an electromagnetic wave shielding wall, ceiling, or floor in an anechoic chamber or the like.

First, in a radio wave anechoic chamber in which a radio wave absorber is installed on the indoor side such as a wall, it is desired that the surface to which the radio wave absorber is attached is flat. Therefore, if there is a projection on the wall surface to which the radio wave absorber is attached, there is a problem that extra materials and processes are required to flatten the surface, leading to an increase in cost.

When a plurality of electromagnetic wave shielding plates are connected by welding to form a wall or the like, irregularities due to welding distortion, that is, deformation of the electromagnetic wave shielding plates due to heat during welding, are likely to occur. Irregularities on the surface to which the radio wave absorber, especially the ferrite radio wave absorber is attached, may deteriorate the characteristics of the anechoic chamber. Therefore, in the field welding method,
Since welding distortion is remarkable, a method of suppressing the occurrence of welding distortion by reducing the size of the electromagnetic wave shielding plate has been adopted. However, reducing the size of the electromagnetic wave shielding plate causes other problems such as an increase in welding length.

In order to reduce welding distortion, it is conceivable to use the aforementioned welding panel method. As one of the welding panel construction methods, there is a technique disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 9-260889. In this technique, the outer edge of the metal plate is L
A bent portion is formed by being bent in a letter shape or an arc shape, a frame is installed at a position inside the vicinity of the bent portion to form a unit panel, and the adjacent bent portions are joined by welding. For this reason, the distortion prevention effect is not sufficient due to the fact that the position where the bent portion is welded is separated from the skeleton and that the temporary fixing before continuous welding between the bent portions is likely to be insufficient. There is a problem.

[0014] In this technique, since a C-shaped joint portion directed to the outdoor side is welded and joined, it is suitable for performing a welding operation from the outdoor side. In particular, when forming the ceiling surface, the work is directed downward, so that the welding work from the outdoor side has good workability. However, it is not always possible to perform the welding work from the outside of the room for all parts such as the wall of the anechoic chamber, and it may be necessary to perform the welding work from the indoor side. In such a case, welding defects are likely to occur at the joint between the welded portion from the outdoor side and the welded portion from the indoor side.

Conventionally, after the welding operation is completed,
Detecting welding defects such as pinholes and cracks has been performed. As a method for detecting a welding defect, for example, a sniffer method is used in which a high-frequency current is applied to the welded metal to detect a magnetic field generated at the defective portion. The defect detection by the sniffer method is performed from the indoor side where noise and protrusions are small. Therefore, when the welding operation is performed from the outside of the room, there is a problem that it is difficult to specify the defective portion because the welded portion is separated from the portion for performing the defect detection.
Further, in the welding operation from the outdoor side, there is a problem that an extra working space is required and a dead space is generated.

Also, welding between unit panels requires mechanical and electromagnetic connections between the panels. Therefore, high welding skills are required for welding between unit panels. When electromagnetic wave shielding is realized by welding, welding work on site is indispensable, and quality and construction time are affected by the skill and working environment of the worker.
Therefore, in order to improve the quality and shorten the construction period, it is desired to minimize the amount of welding work on site.

As a method of holding the electromagnetic wave shielding plate in an anechoic chamber or the like, it is common to combine the anechoic chamber with a building for accommodating the anechoic chamber or form an independent frame, and attach the electromagnetic wave shielding plate to this frame. . Conventionally, the electromagnetic wave shielding plate itself cannot be self-supporting, that is, in any case of the on-site welding method and the welding panel method, that is, another supporting member is required. Therefore, a frame or the like for supporting the electromagnetic wave shielding plate is required, and there is a problem that the cost and the construction period increase.

The unit panel disclosed in Japanese Patent Application Laid-Open No. 7-290889 is provided with a core material. However, the panel itself does not stand on its own.
It is designed to be connected to the framework of a structure such as a pillar, a beam, or a roof. Also, this unit panel is configured by attaching an outer wall to one surface of a core material and attaching an electromagnetic wave shielding plate to the other surface, and also serves as a part of a building structure. Therefore, the unit panel for shielding electromagnetic waves has a problem that the components are excessive and the cost is increased.

The present invention has been made in view of the above problems, and a first object of the present invention is to easily form a flat surface having no projection or distortion as a wall, ceiling or floor in an electromagnetic wave shielding room or an anechoic chamber. An object of the present invention is to provide an electromagnetic wave shielding unit panel, a method of manufacturing the same, and an electromagnetic wave shielding structure and a method of manufacturing the same, which can be formed and do not require a member for supporting the unit panel.

A second object of the present invention, in addition to the first object, is to provide an electromagnetic wave shielding unit panel and a unit panel for easily constructing a wall, ceiling or floor. An object of the present invention is to provide a manufacturing method, an electromagnetic wave shielding structure, and a method for manufacturing the same.

A third object of the present invention, in addition to the first object, is to provide a unit panel for electromagnetic wave shielding, a method of manufacturing the same, and a structure for electromagnetic wave shielding, which can easily detect defects. And a method for manufacturing the same.

A fourth object of the present invention, in addition to the first object, is to provide an electromagnetic wave shielding unit panel capable of reducing the amount of work at a site where an electromagnetic wave shielding room or an anechoic chamber is constructed. An object of the present invention is to provide a method of manufacturing the same, a structure for shielding electromagnetic waves, and a method of manufacturing the same.

[0023]

An electromagnetic wave shielding unit panel according to the present invention is an electromagnetic wave shielding room in which the whole room is covered with an electromagnetic wave shielding material, or the whole room is covered with an electromagnetic wave shielding material, and the inside of the electromagnetic wave shielding material is provided. An electromagnetic wave shielding unit panel for constructing a wall, ceiling or floor in an anechoic chamber provided with an electromagnetic wave absorber at least in part, comprising a rectangular plate-like electromagnetic wave shielding material, each end of four sides. In the portion, an electromagnetic wave shielding plate having a bent portion bent in the L-shape in the same direction, so as to be in contact with the bent portion,
A frame member joined to each end of the four sides of the electromagnetic wave shielding plate, wherein the bent portion is electromagnetically connected to the bent portion in another electromagnetic wave shielding unit panel, and the frame member is connected to the other electromagnetic wave shielding plate. It is mechanically connected to the frame member of the electromagnetic wave shielding unit panel.

In this electromagnetic wave shielding unit panel, the bent portion is electromagnetically connected to the bent portion of the other electromagnetic wave shielding unit panel, and the skeleton member and the mechanical member of the other electromagnetic wave shielding unit panel are mechanically connected to each other. Connected. Thereby, a plurality of unit panels are connected,
A wall, ceiling or floor in an electromagnetic wave shielding room or an anechoic room is constructed.

According to the method of manufacturing an electromagnetic wave shielding unit panel of the present invention, there is provided an electromagnetic wave shielding room in which the whole room is covered with the electromagnetic wave shielding material, or the whole room is covered with the electromagnetic wave shielding material, and at least a part of the inside of the electromagnetic wave shielding material. A method for manufacturing an electromagnetic wave shielding unit panel for constructing a wall, ceiling or floor in an anechoic chamber provided with an electromagnetic wave absorber, for an electromagnetic wave shielding plate made of a rectangular plate-shaped electromagnetic wave shielding material, Each end of the four sides is bent in the same direction in an L-shape to form a bent portion, and a frame member is joined to each end of the four sides of the electromagnetic wave shielding plate so as to be in contact with the bent portion. Things.

In the electromagnetic wave shielding unit panel or the method of manufacturing the same according to the present invention, for example, a bolt hole into which a bolt for mechanically connecting to a frame member of another electromagnetic wave shielding unit panel is inserted into a frame member. Is formed.

In the electromagnetic wave shielding unit panel or the method of manufacturing the same according to the present invention, the frame member is formed of, for example, a square steel pipe.

Further, in the electromagnetic wave shielding unit panel of the present invention or the method of manufacturing the same, an auxiliary frame member may be provided so as to connect between two opposing frame members. In this case, the auxiliary frame member is formed of, for example, a square steel pipe.

In the electromagnetic wave shielding unit panel or the method of manufacturing the same according to the present invention, for example, the length of the unit panel in the longitudinal direction is made substantially equal to the height of the wall in the electromagnetic wave shielding room or the anechoic chamber.

According to the electromagnetic wave shielding structure of the present invention, an electromagnetic wave shielding room in which the whole room is covered with an electromagnetic wave shielding material or an entire room is covered with an electromagnetic wave shielding material, and at least a part of the inside of the electromagnetic wave shielding material absorbs radio waves. An electromagnetic wave shielding structure used as a wall, ceiling or floor in an anechoic chamber provided with a body, made of a rectangular plate-like electromagnetic wave shielding material, and having L in the same direction at each end of four sides. A plurality of electromagnetic wave shielding units each having an electromagnetic wave shielding plate having a bent portion bent in a character shape, and a frame member joined to each end of four sides of the electromagnetic wave shielding plate so as to be in contact with the bent portion. Panels are provided, and bent portions of adjacent electromagnetic wave shielding unit panels are electromagnetically connected to each other, and frame members of adjacent electromagnetic wave shielding unit panels are mechanically connected to each other. Is shall.

In this electromagnetic wave shielding structure, the bent portions of the adjacent electromagnetic wave shielding unit panels are electromagnetically connected to each other, and the frame members of the adjacent electromagnetic wave shielding unit panels are mechanically connected to each other. As a result, the plurality of unit panels are connected to form a wall, ceiling, or floor in the electromagnetic wave shielding room or the anechoic chamber.

[0032] In the method for manufacturing an electromagnetic wave shielding structure according to the present invention, the electromagnetic wave shielding room or the entire room is covered with the electromagnetic wave shielding material, and at least a part of the inside of the electromagnetic wave shielding material. A method of manufacturing an electromagnetic wave shielding structure used as a wall, ceiling or floor in an anechoic chamber provided with an electromagnetic wave absorber, comprising a rectangular plate-shaped electromagnetic wave shielding material, each end of four sides , An electromagnetic wave shielding plate having a bent portion bent in the same direction in an L-shape, and a frame member joined to each end of four sides of the electromagnetic wave shielding plate so as to be in contact with the bent portion. Using a plurality of electromagnetic wave shielding unit panels, bending portions of adjacent electromagnetic wave shielding unit panels are electromagnetically connected to each other, and frame members of adjacent electromagnetic wave shielding unit panels are connected to each other. Mechanically connected.

In the electromagnetic wave shielding structure or the method of manufacturing the same according to the present invention, for example, a bolt hole into which a bolt for mechanically connecting to the frame member of another electromagnetic wave shielding unit panel is inserted into the frame member. Is formed, and the frame members in the adjacent electromagnetic wave shielding unit panels are mechanically connected to each other by bolts and nuts inserted into the bolt holes.

In the structure for shielding electromagnetic waves or the method of manufacturing the same according to the present invention, the frame member is formed of, for example, a square steel pipe.

Further, in the electromagnetic wave shielding structure or the method of manufacturing the same according to the present invention, an auxiliary frame member may be provided so as to connect between two opposing frame members. In this case, the auxiliary frame member is formed of, for example, a square steel pipe.

In the electromagnetic wave shielding structure or the method of manufacturing the same according to the present invention, for example, the length of the unit panel in the longitudinal direction is made substantially equal to the height of the wall in the electromagnetic wave shielding room or the anechoic chamber.

In the electromagnetic wave shielding structure or the method of manufacturing the same according to the present invention, for example, the ridge line portion in the bent portion of the electromagnetic wave shielding plate is disposed indoors.

In the electromagnetic wave shielding structure or the method of manufacturing the same according to the present invention, the bent portions of the adjacent electromagnetic wave shielding unit panels are electromagnetically connected by welding the ridge portions of the bent portions. You.

[0039]

Embodiments of the present invention will be described below in detail with reference to the drawings.

First, an electromagnetic wave shielding room and an electromagnetic wave anechoic room according to an embodiment of the present invention will be described with reference to FIGS. FIG. 4 is a plan sectional view showing an example of a configuration of a test facility including an electromagnetic wave shielding room and an anechoic chamber in the present embodiment, and FIG. 5 is a side sectional view of the test facility shown in FIG. The test equipment shown in these figures is used for an antenna test, an EMC test of electronic equipment, and the like.

The test equipment shown in FIGS. 4 and 5 includes an anechoic chamber 110 arranged adjacent to each other, a measuring chamber 120 as an electromagnetic shielding room for measurement, and an electromagnetic shielding room 1.
30. Above the shield measurement room 130, a machine room 140 is provided.

The anechoic chamber 110 comprises a floor 111, four walls 1
12 and a ceiling 113, all of which are provided with an electromagnetic wave shielding plate 114 made of an electromagnetic wave shielding material. A radio wave absorber 115 is attached to indoor surfaces of the wall 112 and the ceiling 113. A turntable 116 is provided on the floor 111. The floor 111 is provided with an antenna position 117 where the antenna is installed. Further, below the surface of the floor 111, a cable pit 118 is provided.

The measuring chamber 120 has a floor 121, four walls 12
2 and a ceiling 123, all of which are provided with an electromagnetic wave shielding plate 124 made of an electromagnetic wave shielding material. Similarly, the electromagnetic wave shielding room 130 includes a floor 131, a four-sided wall 132
And a ceiling (not shown), all of which are provided with an electromagnetic wave shielding plate 134 made of an electromagnetic wave shielding material.

The electromagnetic wave shielding material is a material having a large reflection coefficient (close to 1) and a small transmission coefficient (close to 0) with respect to an electromagnetic wave of a desired frequency band. Often used.

The radio wave absorber is a structure that has a small reflection coefficient and a low transmission coefficient (close to 0) for radio waves in a desired frequency band, and absorbs incident radio wave energy to convert it into heat energy.

FIG. 6 is a partially cutaway perspective view showing an example of the structure of the wall 112 and the ceiling 113 of the anechoic chamber 110. In this example, the wall 112 and the ceiling 113 are provided with a plurality of electromagnetic wave shielding unit panels 1 formed by an electromagnetic wave shielding plate.
Are lined up. On the indoor side surface of the panel 1, a tile-shaped ferrite electromagnetic wave absorber 142 is laid. Further, a styrofoam-based radio wave absorber 143 is attached to the indoor side surface of the ferrite radio wave absorber 142. The ferrite radio wave absorber 142 is a radio wave absorber utilizing the magnetic resonance loss of ferrite at a high frequency. Styrofoam-based radio wave absorber 143
It is constituted by mixing carbon as a resistor with a styrofoam substrate.

FIGS. 4 and 5 show an electromagnetic wave shielding unit panel and a method of manufacturing the same according to an embodiment of the present invention.
Are applied to the wall, ceiling or floor in the anechoic chamber 110, the shield measurement room 120, and the electromagnetic wave shield room 130 shown in FIG.

Next, an electromagnetic wave shielding unit panel and a method of manufacturing the same, and an electromagnetic wave shielding structure and a method of manufacturing the same according to the present embodiment will be described with reference to FIGS. FIG. 1 is a rear view of an electromagnetic wave shielding unit panel according to the present embodiment. FIG. 2 is a cross-sectional view showing a state where two electromagnetic wave shielding unit panels according to the present embodiment are connected in the width direction. FIG. 3 is an enlarged cross-sectional view showing a connecting portion of the electromagnetic wave shielding unit panel in FIG. 2.

First, the unit panel 1 according to the present embodiment will be described. The unit panel 1 is provided with an electromagnetic wave shielding plate 10 made of a rectangular plate-shaped electromagnetic wave shielding material and having bent portions 11 bent in the same direction at respective ends of four sides in an L-shape. The electromagnetic wave shielding plate 10 is formed to be long in one direction (the vertical direction in FIG. 1). The unit panel 1 further includes an electromagnetic wave shielding plate 10
Bent portion 11 extending in the longitudinal direction (vertical direction in FIG. 1)
And a bent portion 1 extending in the width direction (horizontal direction in FIG. 1) of the electromagnetic wave shielding plate 10 and joined to each end of two sides in the longitudinal direction of the electromagnetic wave shielding plate 10.
1 is provided so as to connect between the two frame members 21 extending in the longitudinal direction and facing each other, and the frame member 22 joined to each end of two sides in the width direction of the electromagnetic wave shielding plate 10. And an auxiliary frame member 23. A plurality of auxiliary frame members 23 are provided as needed.

The electromagnetic wave shielding plate 10 is made of, for example, a galvanized steel plate for realizing rust prevention on the indoor side. In addition, as the electromagnetic wave shielding plate 10, a steel plate not subjected to galvanization, a stainless steel plate, or a plate made of other metal such as aluminum may be used. Stainless steel plates are preferred from the viewpoint of appearance.
In addition, since the electromagnetic wave shielding plate 10 is welded to the frame members 21 and 22 and the auxiliary frame member 23, it is preferable that the electromagnetic wave shielding plate 10 is made of the same material as the frame members 21 and 22 and the auxiliary frame member 23. The thickness of the electromagnetic wave shielding plate 10 is, for example, 2.3 mm. As shown in FIG. 3, the length A of the bent portion 11 is, for example, about 50 mm.

The frame members 21 and 22 are formed of, for example, a square steel pipe as shown in FIG. The size of the square steel pipe is, for example, 2.3 mm in thickness, 100 mm in length L, and 50 mm in width W. Auxiliary frame member 23
Is also formed, for example, by a square steel pipe. For example, the rectangular steel pipe has a wall thickness of 2.3 mm and a vertical length L of 1 mm.
00 mm and the width W are 50 mm. Frame members 21 and 22
Each of the auxiliary frame members 23 is made of a material that is seamless in the length direction.

Frame members 21 and 22 and auxiliary frame member 2
3 are mutually joined by welding. Further, the electromagnetic wave shielding plate 10 and the frame member 21 are joined by spot welding, for example, at a location indicated by reference numeral 12 in FIG. The same applies between the electromagnetic wave shielding plate 10 and the frame member 22 or the auxiliary frame member 23.

Unit panel 1 used for a wall such as an anechoic chamber
Is preferably substantially equal to the height of a wall in an anechoic chamber or the like, and the unit panel 1 is arranged so that the longitudinal direction is the height direction. The height of the anechoic chamber is usually about 5 to 10 m. The limit of the length of the unit panel 1 is about 10 m due to the restrictions on transportation and loading of the unit panel 1 manufactured in the factory. When the length of the unit panel 1 is about 5 to 10 m, the width of the unit panel 1 is about 1 to 2 m in consideration of the thickness of the material used for the electromagnetic wave shielding plate 10 and the availability thereof.

The 2.3 mm-thick galvanized steel sheet used for the electromagnetic wave shielding plate 10 is usually a sheet-like or coil-like (roll-like) material. When the unit panel 1 having a length substantially equal to the height of the wall in the electromagnetic wave shielding room or the anechoic chamber is formed, it is suitable to use a coil-shaped galvanized steel sheet. In addition, coiled galvanized steel sheet
Easy to handle. The maximum width dimension of a coil-shaped galvanized steel sheet which is usually available is about 1200 mm. Therefore, when a commonly available material is used, the maximum width dimension of the unit panel 1 is a length obtained by subtracting the length of the bent portions 11 on both sides from 1200 mm, that is, 1100 m.
m.

It is preferable that the electromagnetic wave shielding plate 10 is a single non-joining plate. However, it is preferable to connect a plurality of steel plates to produce a large-sized electromagnetic wave shielding plate 10 in a place such as a factory where work conditions are good. Is also possible.

The frame members 21 and 22 are formed at predetermined pitches with bolt holes 24 through which bolts for mechanically connecting with the frame members 21 and 22 of the other unit panels 1 are inserted.

Next, a method of manufacturing the unit panel 1 according to the present embodiment will be described. In this manufacturing method, a bent portion 11 is formed by bending each end of four sides into an L-shape in the same direction with respect to an electromagnetic wave shielding plate 10 made of a rectangular plate-shaped electromagnetic wave shielding material. Further, the frame members 21 and 22 and the auxiliary frame member 23 are joined to each other to form a frame. Then, the frame members 21 and 22 are joined to the respective ends of the four sides of the electromagnetic wave shielding plate 10 so that the frame members 21 and 22 are in contact with the bent portions 11 of the electromagnetic wave shielding plate 10.

Next, the structure for shielding electromagnetic waves and the method of manufacturing the same according to the present embodiment will be described. The structure for shielding electromagnetic waves according to the present embodiment is used as a wall, ceiling or floor in an anechoic chamber or the like. This structure for shielding electromagnetic waves is constructed by connecting a plurality of unit panels 1.

When the adjacent unit panels 1 are connected in the width direction, as shown in FIG. 3, the frame members 21 and 21 are respectively inserted into the bolt holes 24 of the two adjacent frame members 21 and 21.
21 is inserted through one side of the bolt 21 and this bolt 2
5, a nut 26 arranged on the other side of the frame members 21 and 21 is screwed into the bolt 25 and the nut 26.
The frame members 21 and 21 are tightened. In addition, since the bent part 11 of two adjacent electromagnetic wave shielding plates 10 exists between the adjacent frame members 21 and 21, as shown in FIG. , A spacer 27 is interposed. The thickness of the spacer 27 is twice the thickness of the electromagnetic wave shielding plate 10. The material of the spacer 27 is preferably the same as that of the electromagnetic wave shielding plate 10. Further, a washer may be used as the spacer 27, and the bolt 25 may be passed through the washer.

When connecting adjacent unit panels 1 in the longitudinal direction, the bolts 25 and the nuts 2
6 clamps two adjacent frame members 22.
In this way, the frame members 21 or the frame members 22 in the adjacent unit panels 1 are mechanically connected.

The bent portions 11 of adjacent unit panels 1 are electromagnetically connected to each other by, for example, welding. In this case, the ridge portions of the bent portion 11 are continuously welded to each other at a position indicated by reference numeral 13 in FIG.
In addition, it is preferable that the unit panel 1 is arranged such that the ridge portion of the bent portion 11 is located on the indoor side. In such a case, the operation of welding the bent portions 11 is performed from the indoor side. By electromagnetically connecting the bent portions 11 of the adjacent unit panels 1 in this manner, an electromagnetic wave shielding function is exhibited.

For the portion where the bent portions 11 of the adjacent unit panels 1 have been welded to each other, a defect is detected by, for example, a sniffer method from the indoor side. If a defect is detected, the defective part is repaired.

Unit panel 1 used for a wall such as an anechoic chamber
The length of the unit panel 1 is set to be substantially equal to the height of the wall, and the length of the unit panel 1 is set to be the height direction.
Is arranged, the wall is constructed by only one unit panel 1 in the height direction. Further, the frame member 21 extending in the height direction has no seam in the middle.

As for the ceiling and floor, since the width of the anechoic chamber may exceed 10 m, the unit panel 1
May be constructed by connecting a plurality of unit panels 1 in the longitudinal direction due to restrictions on transportation and carry-in.

As for the floor, bolt 2
In many cases, it is difficult to secure a space for tightening the nut 5 and the nut 26. Therefore, the unit panel 1 according to the present embodiment may not be used, and may be constructed by another method.

The structure for shielding electromagnetic waves constructed by using the unit panel 1 has a structure in which the frame members 21 and 22 and the auxiliary frame member 23 form a frame. It becomes a self-sustainable structure that does not require anything.

FIG. 7 is a perspective view of an example of an anechoic chamber constructed using the electromagnetic wave shielding structure according to the present embodiment as viewed from the outside of the room. In this example, the wall is constructed by using only one unit panel 1 in the height direction and connecting a plurality of unit panels 1 in the width direction. Further, the ceiling is constructed by connecting a plurality of unit panels 1 in both the longitudinal direction and the width direction. The floor may be constructed similarly to the ceiling or may be constructed by other methods.

In the present embodiment, both the wall and the ceiling can have a self-standing structure, but as shown in FIG.
The ceiling may be suspended from the building using suspension bolts or the like. In the example shown in FIG. 7, the suspension receiving member 31 provided in the building and the unit panel 1 constituting the ceiling are connected by the suspension bolts 32 and 33 and the turnbuckle 34. The turnbuckle 34 is inserted between the suspension bolts 32 and 33 and is a fastener for adjusting the length between the suspension bolts 32 and 33.

FIG. 8 is a front view showing an example of a connecting portion between the suspension bolt and the unit panel in FIG. In this example, the lower end of the suspension bolt 33 is provided with a flat connecting portion 3.
3a are formed. Further, a plate-shaped ceiling panel receiving member 41 is attached to the electromagnetic wave shielding plate 10 of the unit panel 1 constituting the ceiling by, for example, bolts 42 and nuts 43. The connecting portion 33a of the suspension bolt 33 and the ceiling panel receiving member 41 are, for example, bolts 4
4 and a nut (not shown).

As described above, according to the present embodiment, at each end of the four sides, the electromagnetic wave shielding plate 10 having the bent portion 11 bent in the same direction in an L-shape,
The electromagnetic wave shielding unit panel 1 including the frame members 21 and 22 joined to the respective ends of the four sides of the electromagnetic wave shielding plate 10 so as to be in contact with the bent portion 11 is used. The curved portions 11 can be electromagnetically connected to each other by, for example, welding, and the frame members 21 and 22 in the adjacent unit panels 1 can be mechanically connected to each other to construct a wall, ceiling, or floor in an anechoic chamber or the like. According to the present embodiment, by arranging the flat surface of unit panel 1, that is, the surface opposite to the surface on which bent portion 11 is disposed, on the indoor side, the wall, ceiling, or floor in an anechoic chamber or the like is provided. A flat surface without protrusions can be easily formed as the surface. Further, even when the bent portions 11 are electromagnetically connected to each other by welding, the welded portions are very close to the frame members 21 and 22, so that the occurrence of welding distortion can be suppressed, and a flat surface without distortion can be easily formed. Can be formed.

According to the present embodiment, the frame member 2
Since the frames 1 and 22 and the auxiliary frame member 23 form a frame, a member for supporting the unit panel 1 is not required.

Further, according to the present embodiment, the work of turning the flat surface of the unit panel 1 toward the indoor side and electromagnetically connecting the bent portions 11 of the unit panel 1 to each other from the indoor side by welding is performed. Therefore, work for constructing a wall, a ceiling, or a floor can be easily performed. Furthermore, by performing welding work from the indoor side,
Defects can be easily detected.

According to the present embodiment, the two
Since the auxiliary frame members 23 are provided so as to connect the three frame members 21, the strength of the unit panel 1 is increased, and the unit panel 1 can have a structure capable of being more reliably self-standing. Further, the auxiliary skeleton member 23 also has a function of preventing occurrence of welding distortion in the electromagnetic wave shielding plate 10.

According to the present embodiment, the length of the unit panel 1 in the longitudinal direction is substantially equal to the height of a wall in an anechoic chamber or the like, so that work on site where special skills and construction period are required is required. The amount can be reduced, the quality of an anechoic chamber or the like can be improved, the construction period can be shortened, and the cost can be reduced.

The present invention is not limited to the above embodiments, and various changes can be made. For example, in the embodiment, the frame members 21 and 22 of the adjacent unit panel 1 are provided.
Although the mechanical connection between them is made using the bolt 25 and the nut 26, it may be made using other means, for example, a fastener (fastener).

In the embodiment, the electromagnetic connection between the bent portions 11 of the adjacent unit panels 1 is made by welding. However, other means such as the bent portions 11 are used.
It may be performed by fastening or fastening with a fastener via a conductive packing therebetween.

Further, according to the present embodiment, the wall can have a self-supporting structure.
To hold the unit panel 1 during assembly,
The unit panel 1 may be held by a building.

[0078]

As described above, the electromagnetic wave shielding unit panel according to any one of claims 1 to 6, the method for manufacturing an electromagnetic wave shielding unit panel according to any one of claims 7 to 12, and claim 13 An electromagnetic wave shielding structure according to any one of claims 20 to 20, or 21 to 2
8. According to the method for manufacturing an electromagnetic wave shielding structure according to any one of 8 above, an electromagnetic wave shielding plate having a bent portion bent in the same direction in an L-shape at each end of the four sides; The electromagnetic wave shielding unit panel has a frame member joined to each end of the four sides of the electromagnetic wave shielding plate so as to be in contact with the electromagnetic wave shielding plate. Connected to each other, mechanically connecting the frame members of adjacent electromagnetic wave shielding unit panels to form a wall, ceiling or floor in an electromagnetic wave shielding room or an anechoic chamber. As a surface of a wall, a ceiling or a floor, a flat surface without projections or distortion can be easily formed, and a member for supporting the unit panel is not required. Furthermore, since it is possible to turn the flat surface toward the indoor side and electromagnetically connect the bent portions of the unit panel to each other by welding from the indoor side, it is possible to construct a wall, ceiling, or floor. Can be easily performed. Further, by performing the welding operation from the indoor side, it is possible to easily detect a defect.

Further, a unit panel for electromagnetic wave shielding according to claim 4 or 5, a method for manufacturing a unit panel for electromagnetic wave shielding according to claim 10 or 11, and claim 16 or 1
According to the method for manufacturing an electromagnetic wave shielding structure according to claim 7, or the method for manufacturing an electromagnetic wave shielding structure according to claim 24 or 25,
Since the auxiliary frame member is provided so as to connect between two opposing frame members, the effect of further increasing the strength of the unit panel is exhibited.

The electromagnetic wave shielding unit panel according to claim 6, the method for manufacturing an electromagnetic wave shielding unit panel according to claim 12, the electromagnetic wave shielding structure according to claim 18,
According to the method for manufacturing an electromagnetic wave shielding structure according to claim 26, the length of the unit panel in the longitudinal direction is made substantially equal to the height of the wall in the electromagnetic wave shielding room or the anechoic chamber. This has the effect of reducing the amount of work at the site where the anechoic chamber is constructed.

According to the electromagnetic wave shielding structure of the nineteenth aspect or the method of manufacturing the electromagnetic wave shielding structure of the twenty-seventh aspect, the ridge portion of the bent portion of the electromagnetic wave shielding plate is arranged on the indoor side. This has the effect that a flat surface can be directed toward the indoor side.

According to the electromagnetic wave shielding structure of the twentieth aspect or the method of manufacturing the electromagnetic wave shielding structure of the twenty-eighth aspect, the bent portions of adjacent electromagnetic wave shielding unit panels are connected to each other. Welded the ridges of each other to connect them electromagnetically,
Welding work can be performed easily from the indoor side,
There is an effect that the defect can be easily detected.

[Brief description of the drawings]

FIG. 1 is a rear view of an electromagnetic wave shielding unit panel according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a state in which two electromagnetic wave shielding unit panels according to one embodiment of the present invention are connected in a width direction.

FIG. 3 is an enlarged cross-sectional view showing a connecting portion of the electromagnetic wave shielding unit panel in FIG. 2;

FIG. 4 is a plan sectional view showing an example of a configuration of a test facility including an electromagnetic wave shielding room and an anechoic chamber according to an embodiment of the present invention.

5 is a side sectional view of the test equipment shown in FIG.

FIG. 6 is a partially cutaway perspective view showing an example of a structure of a wall or a ceiling of the anechoic chamber in FIGS. 4 and 5;

FIG. 7 is a perspective view of an example of an anechoic chamber constructed using the electromagnetic wave shielding structure according to the embodiment of the present invention, as viewed from the outside of the chamber.

8 is a front view showing an example of a connection portion between the suspension bolt and the unit panel in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Electromagnetic wave shielding unit panel, 10 ... Electromagnetic wave shielding plate, 11 ... Bending part, 21, 22 ... Frame member, 23 ... Auxiliary frame member, 24 ... Bolt hole, 25 ... Bolt, 26 ... Nut, 27 ... Spacer, 110: anechoic chamber, 120: shielding measurement room, 130: electromagnetic shielding room.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Sho-62-152499 (JP, U) Japanese Utility Model No. 2-84400 (JP, U) Japanese Utility Model No. 4-27004 (JP, U) Japanese Utility Model No. 4- 59205 (JP, U) Japanese Utility Model 6-13197 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G12B 17/02 H05K 9/00

Claims (28)

(57) [Claims] 1. An electromagnetic wave shielding room in which the entire room is covered with an electromagnetic wave shielding material or an electromagnetic wave anechoic room in which the entire room is covered with an electromagnetic wave shielding material and a radio wave absorber is provided at least partially inside the electromagnetic wave shielding material. An electromagnetic wave shielding unit panel for constructing a wall, a ceiling, or a floor, comprising a rectangular plate-like electromagnetic wave shielding material, and folded at each end of four sides in an L-shape in the same direction. An electromagnetic wave shielding plate having a bent portion, and a frame member joined to each end of four sides of the electromagnetic wave shielding plate so as to be in contact with the bent portion, wherein the bent portion has another electromagnetic wave shielding. The electromagnetic wave shielding unit is electromagnetically connected to a bent portion of the unit panel for electromagnetic waves, and the framing member is mechanically connected to a framing member of another electromagnetic wave shielding unit panel. Nell. 2. The frame member according to claim 1, wherein a bolt hole through which a bolt for mechanically connecting to the frame member of another electromagnetic wave shielding unit panel is inserted is formed in the frame member. Electromagnetic wave shielding unit panel. 3. The electromagnetic wave shielding unit panel according to claim 1, wherein the frame member is formed of a square steel pipe. 4. The electromagnetic wave shielding unit panel according to claim 1, further comprising an auxiliary frame member provided so as to connect between two opposing frame members. 5. The electromagnetic wave shielding unit panel according to claim 4, wherein the auxiliary frame member is formed of a square steel pipe. 6. The electromagnetic wave shielding unit panel according to claim 1, wherein a length in a longitudinal direction is substantially equal to a height of a wall in the electromagnetic wave shielding room or the anechoic chamber. 7. An electromagnetic wave shielding room in which the entire room is covered with an electromagnetic wave shielding material or an electromagnetic wave anechoic room in which the entire room is covered with an electromagnetic wave shielding material and a radio wave absorber is provided at least partially inside the electromagnetic wave shielding material. A method of manufacturing an electromagnetic wave shielding unit panel for constructing a wall, a ceiling, or a floor, comprising: an electromagnetic wave shielding plate made of a rectangular plate-shaped electromagnetic wave shielding material; An electromagnetic wave shielding unit comprising: a bent portion formed by being bent into an L-shape; and a frame member joined to each end of four sides of the electromagnetic wave shielding plate so as to be in contact with the bent portion. Panel manufacturing method. 8. The electromagnetic wave shield according to claim 6, wherein a bolt hole for inserting a bolt for mechanically connecting the frame member to another electromagnetic wave shielding unit panel is formed in the frame member. Method of manufacturing unit panel. 9. The method for manufacturing an electromagnetic wave shielding unit panel according to claim 7, wherein the frame member is formed of a square steel pipe. 10. The method of manufacturing an electromagnetic wave shielding unit panel according to claim 7, further comprising providing an auxiliary frame member so as to connect between the two opposite frame members. 11. The method for manufacturing an electromagnetic wave shielding unit panel according to claim 10, wherein the auxiliary frame member is formed of a square steel pipe. 12. The method of manufacturing an electromagnetic wave shielding unit panel according to claim 6, wherein the length in the longitudinal direction is substantially equal to the height of a wall in the electromagnetic wave shielding room or the anechoic chamber. . 13. An electromagnetic wave shielding room in which the entire room is covered by an electromagnetic wave shielding material or an electromagnetic wave anechoic room in which the entire room is covered by an electromagnetic wave shielding material and a radio wave absorber is provided at least partially inside the electromagnetic wave shielding material. An electromagnetic wave shielding structure used as a wall, a ceiling, or a floor, comprising a rectangular plate-like electromagnetic wave shielding material, and bent at each end of four sides in an L-shape in the same direction at each end. A plurality of electromagnetic wave shielding unit panels each including an electromagnetic wave shielding plate having a portion, and a frame member joined to each end of four sides of the electromagnetic wave shielding plate so as to be in contact with the bent portion. The bent portions of the electromagnetic wave shielding unit panel are electromagnetically connected to each other, and the frame members of the adjacent electromagnetic wave shielding unit panels are mechanically connected to each other. Electromagnetic wave shielding structure. 14. The frame member has a bolt hole through which a bolt for mechanically connecting to a frame member of another electromagnetic wave shielding unit panel is inserted, and a frame member of an adjacent electromagnetic wave shielding unit panel. 14. The electromagnetic wave shielding structure according to claim 13, wherein the members are mechanically connected to each other by a bolt and a nut inserted into the bolt hole. 15. The structure for shielding electromagnetic waves according to claim 13, wherein the frame member is formed of a square steel pipe. 16. The electromagnetic wave shielding unit panel,
14. An auxiliary frame member provided so as to connect between two opposing frame members.
16. The structure for shielding electromagnetic waves according to any one of claims 15 to 15. 17. The electromagnetic wave shielding structure according to claim 16, wherein the auxiliary frame member is formed of a square steel pipe. 18. The structure for shielding electromagnetic waves according to claim 13, wherein the length in the longitudinal direction is substantially equal to the height of the wall in the electromagnetic wave shielding room or the anechoic chamber. 19. The ridge portion of the bent portion of the electromagnetic wave shielding plate is disposed on the indoor side.
19. The electromagnetic wave shielding structure according to any one of 3 to 18. 20. The bent portions of adjacent electromagnetic wave shielding unit panels are electromagnetically connected to each other by welding ridge portions of the bent portions. An electromagnetic wave shielding structure according to any one of the above. 21. An electromagnetic wave shielding room in which the entire room is covered by an electromagnetic wave shielding material or an electromagnetic wave anechoic room in which the entire room is covered by an electromagnetic wave shielding material and a radio wave absorber is provided at least partially inside the electromagnetic wave shielding material. A method for manufacturing an electromagnetic wave shielding structure used as a wall, a ceiling or a floor, comprising a rectangular plate-like electromagnetic wave shielding material, and bent at each end of four sides into an L-shape in the same direction. Using a plurality of electromagnetic wave shielding unit panels having an electromagnetic wave shielding plate having a bent portion, and a frame member joined to each end of four sides of the electromagnetic wave shielding plate so as to be in contact with the bent portion. The electromagnetically shielded unit panels of adjacent electromagnetic wave shielding unit panels are electromagnetically connected to each other, and the frame members of adjacent electromagnetic wave shielding unit panels are mechanically connected to each other. Of manufacturing a structure for shielding electromagnetic waves. 22. A bolt hole through which a bolt for mechanically connecting to a framing member of another electromagnetic wave shielding unit panel is formed in the framing member, and framing members of adjacent electromagnetic wave shielding unit panels are formed. 22. The method of manufacturing an electromagnetic wave shielding structure according to claim 21, wherein the connection is made mechanically by a bolt and a nut inserted into the bolt hole. 23. The method for manufacturing an electromagnetic wave shielding structure according to claim 21, wherein the frame member is formed of a square steel pipe. 24. The electromagnetic wave shielding unit panel,
22. An auxiliary frame member provided so as to connect between two opposing frame members.
24. The method of manufacturing an electromagnetic wave shielding structure according to any one of the above items. 25. The method of manufacturing an electromagnetic wave shielding structure according to claim 24, wherein the auxiliary frame member is formed of a square steel pipe. 26. The method of manufacturing an electromagnetic wave shielding structure according to claim 21, wherein the length in the longitudinal direction is substantially equal to the height of a wall in the electromagnetic wave shielding room or the anechoic chamber. . 27. The ridge line portion of the bent portion of the electromagnetic wave shielding plate is disposed on the indoor side.
27. The method for manufacturing an electromagnetic wave shielding structure according to any one of the above items. 28. The method according to claim 21, wherein the bent portions of the adjacent electromagnetic wave shielding unit panels are electromagnetically connected to each other by welding ridge portions of the bent portions. A method for producing the electromagnetic wave shielding structure according to the above.