JP2696476B2 - Anechoic chamber - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for generating noise which causes electromagnetic interference to other devices, or to irradiate a strong electric field to an electronic device, in particular, a device mounted with a semiconductor, to cause a malfunction. The present invention relates to an anechoic chamber used for testing, for example.

[0002]

2. Description of the Related Art Conventionally, when constructing an anechoic chamber, a composite panel having an electromagnetic wave shielding effect by attaching an electromagnetic wave shielding plate to a core material made of a sandwich board or the like is manufactured at a factory, while a pre-constructed building or the like is used. It is common practice to make a stand for the interior material (frame made of steel) within the structure by taking a standstill from the structure described above, and to attach the electromagnetic wave shielding panel inside the base to assemble.

[0003]

Since the base material of the interior material is self-supporting in the structure and the electromagnetic wave shield panel is further disposed inside the structure, the inner dimension of the electromagnetic wave shield plate constituting the inner surface of the anechoic chamber is It is much smaller than the inner dimension of the structure. For this reason, in order to provide an anechoic chamber having the required inner dimensions, it is necessary to construct a correspondingly large structure, which is uneconomical. Further, in constructing the anechoic chamber, it takes time and effort to shield the panel joints and to attach an electromagnetic wave absorber (such as a ferrite tile), which reduces the work efficiency, increases the construction period, and increases the cost.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and has an object to improve the construction efficiency, make the electromagnetic wave shielding performance uniform, and reduce the building area of a structure. To provide an anechoic chamber.

[0005]

In order to achieve the above object, according to the present invention, a core material is constituted by a structural member, and one surface of the core material is stretched outward from an outer peripheral portion of the core material. the electromagnetic shield plate mounting issuing, by bending the outer peripheral portion of the electromagnetic shield plate to the back side, the outer peripheral portion of the electromagnetic shield plate is pre
Forming a continuous frame facing outward so as to wrap the outer peripheral portion of the core material , and forming a step-like convex portion on the surface of the frame portion, and forming an electromagnetic wave absorber on the surface of the electromagnetic wave shield plate. The attached electromagnetic wave shield panel is connected to a frame of a pre-constructed structure such as a column, a beam or a roof via a mounting bracket, and the protruding portions of the adjacent electromagnetic wave shield panels are connected to each other. On the other hand, an outer wall covering the core material is attached to the other surface of the core material of the adjacent electromagnetic wave shield panels.

[0006]

According to the above construction, after the electromagnetic wave shield panel is manufactured by attaching the electromagnetic wave shield plate to the core material and attaching the electromagnetic wave absorber to the electromagnetic wave shield plate,
The electromagnetic wave shield panel is directly connected to the frame of the structure that has been constructed in advance, and the projections of the adjacent electromagnetic wave shield panels are connected to each other to form a panel joint, and the electromagnetic wave shield is attached to the panel joint. On the other hand, an outer wall is attached to the adjacent electromagnetic wave shield panels to construct an anechoic chamber.

In this anechoic chamber, the core material of each electromagnetic wave shield panel is a structure that forms a part of the frame of the structure, and the electromagnetic wave shield plate is brought closer to the frame of the structure by directly connecting the core material. .

[0008]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan sectional view showing a connection structure near a pillar in an anechoic chamber, FIG. 2 is a side sectional view taken along the line CC of FIG. 1, FIG. 3 is a partially enlarged view of FIG. 1, and FIG. 1 is a side sectional view taken along line DD of FIG. 1, FIG. 5 is a front right sectional view of FIG. 4, FIG. 6 is an external view of the anechoic chamber shown in FIG. 1 with a part of the outer wall omitted, and FIG. It is an inside view of the anechoic chamber from which a part was omitted. 8 is a perspective view schematically showing a frame of a structure in the anechoic chamber, FIG. 9 is an inside view showing a connection structure of an electromagnetic wave shield panel to a column of the frame, and FIG. 10 is a connection between the electromagnetic wave shield panels. Exploded perspective view showing the structure,
FIG. 11 is a sectional view showing another example of the shield structure for the panel joint.

In these figures, 1 is an electromagnetic wave shielding panel, 3 is an outer wall, and 11a is a structure 11 such as a pillar, a beam, a roof, or the like.
It is a skeleton.

As shown in FIGS. 1 to 7, the electromagnetic wave shield panel 1 includes a core 2 composed of structural members, an electromagnetic wave shield plate 4, and a number of ferrite tiles 5 constituting an electromagnetic wave absorber. Have been.

As shown in FIG. 6, the core member 2 has a rectangular shape in which two section steels 2A ₁ and 2A ₂ each having a groove-shaped cross section are opposed to each other in parallel to each other via a section steel 2A _3. while framework, brace 2B between the shaped steel _2A 1, 2A ₂
Are combined.

[0013] The core member 2 has the shape steel 2A ₁ ,
L-shaped mounting brackets 7 ₁ , 7 protruding from the ends of 2A _2
2 are provided. One piece 7a of the mounting brackets 7 ₁ and 7 ₂ is formed so as to extend in the direction facing the shaped steel members 2A ₁ and 2A ₂ , and the other piece 7b is formed so as to extend in the thickness direction of the core material 2. A hole 7c is formed in the one piece 7a.

[0014] Then, FIGS. 4 and as shown in 5, the mounting bracket ₇₁ of the other positioning jig ₈₁ on the outer surface of the piece 7b
Is attached, it is formed with a cutout 7d in the positioning device _81. The other piece 7 of the mounting bracket 7 ₂
The b outer surface of the positioning member ₈₂ that engages a notch 7d of the positioning jig ₈₁ is formed. 7e is a positioning hole. The positioning device ₈₁ is intended doubling as the displacement preventing the outer eye plate 15 to be described later.

The electromagnetic wave shield plate 4 is attached to one surface 2a of the core member 2 by welding or the like. The electromagnetic wave shield plate 4 extends outward from the outer peripheral portion 2b of the core member 2 and is formed on the outer peripheral portion of the electromagnetic wave shield plate 4 by bending the electromagnetic wave shield plate 4 backward. A continuous frame portion 4a whose surface faces the outer peripheral side is formed.

A pair of opposing pieces 4 is provided on the surface of the frame 4a.
The step-like convex part 4c provided with b is formed so as to be drawn from the surface of the electromagnetic wave shielding plate 4 by bending.

The ferrite tile 5 is adhered and fixed to the surface of the electromagnetic wave shielding plate 4 excluding the peripheral portion 4d.

On the other hand, a skeleton 11a of the structure 11 (FIG. 1)
A plurality of plate-shaped mounting plates 9 are mounted on the H-shaped steel column) at intervals in the axial direction.
a is formed. 9b is a positioning hole.

Mounting brackets 7 ₁ , 7 ₂ provided on the electromagnetic wave shield panel 1 are respectively attached to the mounting plates 9, 9, and are fitted by fitting pins (not shown) into the positioning holes 7 e, 9 b. a bolt 12 is inserted through into the hole 9a and the mounting bracket ₇ 1, _{7 2} of the holes 7b of the plate 9 is clamped with a nut 13. Thus, electromagnetic shielding panel 1 is mounted between the framework 11a adjacent the structure 11, the longitudinal direction of the shaped steel _2A 1, 2A ₂ opposing directions (in FIG. 6 vertical direction) and section steel _2A 1, 2A ₂ (In FIG. 6, the left-right direction).

As shown in detail in FIG. 3, a thin copper wire is woven in a flat string shape between one opposing pieces 4b of the adjacent projections 4c of the adjacent electromagnetic wave shielding panels 1. A conductive braid 14 and an inner panel 16 are provided, and an outer panel 15 is provided between the opposing pieces 4b.
A bolt 18 is attached to 5 by tapping or welding. The bolt 18 is inserted through the gap 17 between the convex portions 4c, the braided body 14, and the inner panel 16 so that the bolt 1
By tightening the nut 19 screwed into the nut 8, the convex portion 4 c and the braided body 14 are sandwiched between the outer panel 15 and the inner panel 16.

As described above, the projections 4c of the adjacent electromagnetic wave shield panels 1 are connected to each other to form a panel joint, and the U- shaped opening between the frame parts 4a of the electromagnetic wave shield plate 4 is opened on the front side. Groove 21 is formed, and the groove 21 is formed.
The braided body 14 and the inner panel 16 of the panel joint are accommodated therein.

Further, a ferrite tile 5A constituting an electromagnetic wave absorber is provided between the peripheral portions 4d of the electromagnetic wave shield plates 4 of the adjacent electromagnetic wave shield panels 1, and is provided on each of the electromagnetic wave shield panels 1 in advance. The ferrite tile 5 is arranged adjacent to the ferrite tile 5. The ferrite tiles 5 and 5A include a single-layer ferrite, a two-layer combination of a ferrite and a dielectric, and a combination of a ferrite and a dielectric loss material.

An outer wall 3 covering the core member 2 is provided on the other surface 2c of the core member 2 of the adjacent electromagnetic wave shield panel 1.
Is attached. The outer wall 3 is composed of a wall 3a such as a corrugated plate having a predetermined length and width. At least the width direction ends of the wall 3a are overlapped with each other and attached to the core 2 by tapping screws. It is. Between the outer walls 3, a frame cover 20 that covers the frame 11a of the structure 11 is attached.

In order to install the ferrite tile 5A flat with the adjacent ferrite tile 5, as shown in FIG. 11, a conductive lid 2 to which the ferrite tile 5A is attached is used.
2 may be attached to the opening of the groove 21. That is, one end 23a of the connecting member 23 is sandwiched between the inner panel 16 and the nut 19, and the other end 23b of the connecting member 23 is held.
Is formed in parallel with the inner panel 16 and is arranged in the opening of the groove 21. Then, the lid 22 is loosely fitted in the opening of the groove 21.
The lid 22 is connected to the other end 23b of the connecting member 23 by a dish-shaped pop rivet 24 or the like. Next, the ferrite tile 5A is attached to the lid 22 by bonding or the like, and the ferrite tile 5A is laid between the adjacent portions 4d of the electromagnetic wave shielding plate 4 of the adjacent electromagnetic wave shielding panel 1.

According to the above configuration, one surface 2a of the core material 2
The electromagnetic wave shield panel 4 is attached to the ferrite tile 5 on the surface of the electromagnetic wave shield plate 4 to manufacture the electromagnetic wave shield panel 1 in advance.

[0026] After the mounting bracket ₇₁ provided in the core material 2 of the electromagnetic shielding panel 1, _{7 2,} was ligated to the mounting plate 9, 9 provided on the framework 11a of the structure 11, the phase adjacent electromagnetic shielding panel 1 Are connected to each other, and a lid 22 is attached to the opening of the groove 21 as necessary. Thereafter, the ferrite tile 5A is laid between the peripheral portions 4d of the electromagnetic wave shield plates 4 of the adjacent electromagnetic wave shield panels 1.
Thus, the anechoic chamber 25 is constructed.

The frame 2 of the electromagnetic wave shielding panel 1 can be easily attached to the frame 11a of the structure 11 by directly connecting the core member 2. After the electromagnetic wave shield panel 1 is mounted adjacent to the electromagnetic wave shield panel 1, the braided body 14 and the ferrite tile 5A can be easily mounted on the panel joint portion drawn from the surface of the electromagnetic wave shield plate 4, and the shielding work can be easily performed. After mounting the electromagnetic wave shield panel 1, a wall 3a such as a corrugated plate is mounted on the frame 2 of the electromagnetic wave shield panel 1 over a wide area. Thus, the construction of the anechoic chamber 25 can be easily and smoothly performed.

In the anechoic chamber 25, the section steels 2A ₁ ,
The strength of the core material 2 is increased by 2A ₂ , 2A ₃ , and the brace material 2B. The core member 2 linked directly to the framework 11a of the structure 11 via the mounting bracket 7 _1, 7 _2, are connected between the framework 11a of the structure 11 through the core member 2. Therefore, a part of the skeleton 11a of the structure 11 is constituted by the core material 2 of the electromagnetic wave shielding panel 1, and the skeleton 11a can be simplified. Further, the electromagnetic wave shield plate 4 can be brought closer to the frame 11 a of the structure 11 by directly connecting the core member 2, so that the inner size of the anechoic chamber 25 can be made closer to the inner size of the structure 11.

In use, the electromagnetic wave shielding panels 1 adjacent to each other by the braid 14 at the panel joint portion.
The electrical connection of the electromagnetic wave shield plate 4 is maintained satisfactorily. Further, not only the braided body 14 is brought into contact with one of the opposing pieces 4b of the protruding portion 4c in a surface contact state, but also the protruding portion 4c is bent in a U-shape to elastically connect the electromagnetic wave shield panels 1 to each other. As a result, the braided body 14 is hardly damaged, and the vibration transmitted between the electromagnetic wave shield panels 1 is absorbed.

[0030]

As described above, according to the present invention, a core material is constituted by a structural member, and an electromagnetic wave shielding plate projecting outward from an outer peripheral portion of the core material is attached to one surface of the core material. The outer peripheral portion of the electromagnetic wave shield plate is bent to the back side, and the outer peripheral portion of the electromagnetic wave shield plate is wrapped around the outer peripheral portion of the core material.
Forming a continuous frame portion facing the other side , and forming a step-like convex portion on the surface of the frame portion, an electromagnetic wave shield panel configured by attaching an electromagnetic wave absorber to the surface of the electromagnetic wave shield plate. Connecting the projections of the adjacent electromagnetic wave shield panels to adjacent frames of structures such as pillars, beams, roofs, etc., which are constructed in advance, and connecting the adjacent electromagnetic wave shield panels to each other, while connecting the adjacent electromagnetic wave shield panels. On the other side of the core material,
Since the outer wall covering the core material is attached and constructed, the electromagnetic wave shield panel is directly connected to the frame of the structure, the adjacent electromagnetic wave shield panels are connected, the conductive member is attached to the panel joint portion, and the electromagnetic wave absorber is used. By performing shield work, an anechoic chamber can be reliably constructed.

In this construction, the core of the electromagnetic wave shielding panel can be easily attached to the frame of the structure by directly connecting it.
The core can form a part of the framework of the structure to simplify the framework. After the adjacent installation of the electromagnetic wave shield panel, the on-site work of the shield work can be completed only by the operation of attaching the electromagnetic wave absorber to the groove (joint) formed between the frame portions of the electromagnetic wave shield panel. In addition, the shielding work for the panel joint drawn in from the surface of the electromagnetic wave shielding plate is easy. In addition, the outer wall can be mounted over a large area at a time on the surface of the core material of the electromagnetic wave shielding panels arranged in a plurality of stages or in a plurality of rows in the horizontal direction. Therefore, the construction of the anechoic chamber can be performed easily and smoothly, so that the construction efficiency can be improved, the construction period can be shortened, and the construction cost can be reduced.

Also, the electromagnetic wave shielding plate and the electromagnetic wave absorbing member of the electromagnetic wave shielding panel, and the conductive member and the electromagnetic wave absorbing member at the panel joint portion can make the electromagnetic wave shielding performance of the anechoic chamber uniform.

Further, since the core of the electromagnetic wave shielding panel is directly connected to the frame of the structure, the electromagnetic wave shielding plate can be brought close to the frame to make the inner dimensions of the anechoic chamber closer to the inner dimensions of the structure. it can. Therefore, the construction area of the structure required for constructing the anechoic chamber can be reduced as compared with the related art.

[Brief description of the drawings]

FIG. 1 is a plan sectional view showing a connection structure near a column of an anechoic chamber according to an embodiment of the present invention.

FIG. 2 is a side sectional view taken along line CC of FIG. 1;

FIG. 3 is a partially enlarged view of FIG. 1;

FIG. 4 is a side sectional view taken along line DD of FIG. 1;

FIG. 5 is a left front sectional view of FIG. 4;

6 is an external view of the anechoic chamber shown in FIG. 1 from which a part of an outer wall is omitted.

FIG. 7 is an inside view of the anechoic chamber in which a part of the electromagnetic wave absorber is omitted.

FIG. 8 is a perspective view schematically showing a framework of a structure in the anechoic chamber and a part where an electromagnetic wave shield panel is attached.

FIG. 9 is an inside view showing the connection structure of the electromagnetic wave shielding panel to the column of the skeleton.

FIG. 10 is an exploded perspective view showing a connection structure between electromagnetic wave shield panels.

11 is a sectional view showing another example of the shield structure of the panel joint section in FIG. 1. FIG. (2) It is a perspective view which shows a part of (1).

[Explanation of symbols]

REFERENCE SIGNS LIST 1 electromagnetic wave shielding panel 2 core material 2A ₁ , 2A ₂ , 2A _{3 section} steel (structural member) 2B brace material (structural member) 2a one surface 2b outer peripheral portion 2c other surface 3 outer wall 4 electromagnetic wave shield plate 4a frame portion 4c convex Part 5, 5A Ferrite tile (electromagnetic wave absorber) 7 ₁ , 7 ₂ Mounting bracket 9 Mounting plate 11 Structure 11a Frame

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Yasushi Ikeda 1-13-1 Nihonbashi, Chuo-ku, Tokyo Inside TDK Corporation (72) Inventor Toshinobu Shiokawa 1-13-1 Nihonbashi, Chuo-ku, Tokyo Inside DK Corporation (72) Inventor Naotoku Isotani 1-13-1 Nihonbashi, Chuo-ku, Tokyo TDK Corporation (72) Inventor Michimi Wada 6-2-10 Ginza, Chuo-ku, Tokyo Tomoe Corporation (72) Inventor Shojiro Kishida 6-2-10 Ginza, Chuo-ku, Tokyo Inside Tomoe Corporation (72) Inventor Motoo Suzuki 6-2-10 Ginza, Chuo-ku, Tokyo Inside Tomoe Corporation (72 Inventor Toshihiro Une 6-2-10 Ginza, Chuo-ku, Tokyo Tomoe Corporation (72) Inventor Hidetada Yoshihara 6-2-10 Ginza, Chuo-ku, Tokyo Inside Tomo Corporation (72) Inventor Tetsuro Okabe 6-2-10 Ginza, Chuo-ku, Tokyo Inside Tomoe Corporation ( 72) Inventor Seiji Magara 6-2-10 Ginza, Chuo-ku, Tokyo Inside Tomoe Corporation (56) References JP-A-3-199546 (JP, A) JP-A-3-88396 (JP, U)

Claims (1)

(57) [Claims] An electromagnetic wave shield plate is provided on one surface of the core material, the electromagnetic wave shield plate extending outward from an outer peripheral portion of the core material, and the outer peripheral portion of the electromagnetic wave shield plate is placed on the back side. by bent, the outer peripheral portion of the electromagnetic shield plate is the
A continuous frame portion facing outward is formed so as to wrap the outer peripheral portion of the core material , and a step-like convex portion is formed on the surface of the frame portion, and an electromagnetic wave absorber is attached to the surface of the electromagnetic wave shield plate. The electromagnetic wave shielding panel configured as described above is connected to a frame of a pre-constructed structure such as a pillar, a beam or a roof via a mounting bracket, and the protruding portions of the adjacent electromagnetic wave shielding panels are connected to each other. On the other hand, an electromagnetic wave anechoic chamber is constructed by attaching an outer wall covering the core material to the other surface of the core material of the adjacent electromagnetic wave shield panels.