JPH056718Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Field of industrial application) The invention reduces the intrusion of electromagnetic interference from the outside, and also reduces the leakage of the above-mentioned interference occurring indoors to the outside. The present invention relates to an electromagnetic shielding room that can prevent the generation of static electricity inside the room.
Note that in this specification, the term "wall" is used as a concept that includes not only the original walls around the room but also the ceiling and floor.

(Conventional technology) Research rooms that generate electromagnetic waves, rooms with computer-related equipment, medical equipment, etc., and even ICs.
Electromagnetic shielding rooms are widely used in clean rooms where products are manufactured. Generally, in order to create an electromagnetic shielding room, it is sufficient to cover the inner surface, outer surface, or both of the walls with a conductive material. Conventionally, copper foil or other metal thin plates were attached, or conductive paint was applied. However, as industrialization progresses in recent years, standard instruments are stored and managed in the standard temperature range (20°C ± 0.5°C) and standard humidity range (50% ± 10%) throughout the year for measurements related to computers and medical equipment. In some cases, standard testing rooms have been created for this purpose, and measurements have become necessary under arbitrarily set conditions of temperature -30°C to +60°C and humidity of 95%. We needed a variable constant temperature room that could change the temperature and humidity.
Conventional techniques for manufacturing shielded chambers caused condensation due to the temperature difference between indoor and outdoor environments, making them unusable. Therefore, a method has been adopted in which an electromagnetic shielding chamber is formed by a panel in which a core material such as foamed polyethylene having heat insulating properties is sandwiched between thin metal plates. That is, the required number of these heat insulating panels are arranged on each of the six sides constituting the room to form the room. The surface plate is not limited to the metal plate mentioned above, but also includes a plastic plate whose surface is coated with metal foil or conductive paint. Although both the front and back surface plates may be electrically conductive, only one surface may be electrically conductive. By arranging these panels and electrically connecting their conductive surfaces, it becomes an electromagnetic shielding room. The problem here is the joints between the panels, that is, the joints. If they are simply placed side by side, electromagnetic waves will leak from the joints.

In order to eliminate leakage from these joints, conventional methods have been to place a joint plate made of a metal plate of an appropriate width across both sides of the joint and fix it with screws, or to use a metal plate made of a metal plate. The method used was to braze them with solder or the like. In addition, by making the sides of the panels into a special shape and attaching a conductive gasket to one side, by pressing it against the side of the side-by-side panel, the surface plates of both panels will come into contact and be electrically connected. What I did (Jikiakiaki
59-191792) is also known.

(Problem that the invention aims to solve) In the former case, in order to ensure sufficient contact between the batten and panel surface board and eliminate leakage of electromagnetic waves, the pitch of the screws must be shortened and the panel must be fixed with a large number of screws. Must be. Therefore, although it is very time consuming,
It was not pleasing to the eye. In addition, since a large number of screws are used, moisture often enters through the screws, causing the inner core material to deteriorate.Furthermore, if the batten, surface plate, and screws are made of different materials, There was also the problem of electrical contact occurring and deterioration of conductivity due to aging. It is also possible to braze the battens with solder, but in special laboratories where temperature changes occur, cracks may form between the top plate and the solder due to the deformation of the top plate due to temperature changes, and radio waves may leak, resulting in shielded rooms. There was a problem with the loss of its functionality.

Furthermore, when using the latter conductive gasket, the manufacturing work of the electromagnetic shielding room becomes easier and problems with moisture etc. are alleviated, but the shape of the side of the panel, that is, the shape and fit of the joints, is limited.
The problem was that it lacked versatility.

The object of the present invention is to provide an electromagnetic shielding room using panels that solves these problems.

[Structure of the idea]

(Means for Solving the Problem) Therefore, in the present invention, the peripheral parts of both face plates are bent so that the peripheral parts of both face plates approach each other at almost right angles, and the bent peripheral parts are folded into a frame with grooves provided at both ends. The frame should be shaped to be inserted into the groove, and the tip of the outer clamping piece on the outside of the panel forming the groove should be kept at a position lower than the position of both surface plates of the panel. , when the panels are butted together at the frame, a space is formed above the tips of the outer clamping pieces of both panels, and this space is filled with conductive adhesive to electrically connect the entire wall. Further, the surface plate of at least one of the conductive surface plates is grounded.

The core material of the panel is not particularly limited, and not only a heat insulating material such as foamed polyurethane but also various honeycomb cores can be used. There are no particular limitations on the surface plate, but stainless steel plates, galvanized steel plates,
An aluminum alloy plate, plywood, or resin plate coated with conductive paint can be used.

(Function) When the panels are arranged with their sides facing each other, a space is created between the panels by the tips of the outer clamping pieces of the frame, and the space is filled with a conductive adhesive. Therefore, the wall front body is electrically connected to form an electromagnetic shielding room.

(Example) FIG. 1 is a cross-sectional view of a joint of a panel 1, in which the joint is sealed with a conductive adhesive 2. As shown in the figure, this embodiment uses a surface plate made of polyurethane foam that is larger than the core material 3 and whose periphery is bent approximately at right angles to the side surface of the core material 3. A frame 5 made of vinyl chloride is attached to the side surface of the panel 1, and the peripheral portion 4a of the surface plate 4 is fixed to the frame 5. There are two types of cross-sectional shapes of the frame 5 as shown in the figure, but both have grooves formed near the upper and lower ends (in the drawing) into which the peripheral portions 4a of the panel are inserted.

The upper and lower ends of this frame are both bent at a substantially right angle so that the surface plate 4 can be placed thereon, and an outer clamping member is formed along a vertical portion of the bent portion at right angles to form the groove with the vertical portion. A piece 5a is formed. The tip of the outer clamping piece 5a is shortened so as not to reach the surface of the surface plate 4, so that a space is created beyond the tip of the clamping piece when the two panels are butted against each other.

In this example, two types of shapes are prepared for the central part that connects the upper and lower ends of the frame, one that is concave inward and one that protrudes outward, so that when the panels are butted together, they fit together. I try to match it. Of course, it goes without saying that this intermediate portion may be made flat.

In this embodiment, the panels are butted together to form a wall, and in this case, the above-mentioned outer clamping piece 5 is used.
The space above a is filled with conductive adhesive 2.
If necessary, cover the area filled with adhesive with an appropriate material. It is desirable to use a hard material such as a batten made of metal plates for the floor, but plastic plates or even tape may be used for other areas. In the illustrated embodiment, the panel 1 has conductive surface plates 4 on both the inner and outer surfaces, but if either one is made of an insulating material such as plastic, conductive adhesive is applied to the conductive surface plate 4. It goes without saying that the agent must be filled. By using conductive plates on both sides and filling the abutting portions with conductive adhesive, a double-structured electromagnetic shielding chamber is created.

The surface plate 4 of this embodiment uses thin stainless steel plates both inside and outside, but as mentioned above, the material of the surface plate 4 is not particularly limited as long as at least one surface is conductive. Further, as described above, the material of the core material 3 is not limited to a specific material.

The conductive adhesive 2 mentioned above is, for example, "Shin-Etsu Silicone Sealant KE4576" manufactured by Shin-Etsu Chemical.

When the indoor side is used as a shield surface, a hole 7 penetrating from the indoor to the outdoor is made in at least one of the panels, a vinyl chloride tube 8 is inserted into the hole, and a bolt 9 is passed and fixed therein. The indoor side has a surface plate 4
A seat plate 10 is attached via the adhesive 2 described above, and the head of the bolt 9 is in contact with this seat plate 10 (FIG. 2). This bolt 9 is fixed on the outdoor side with nuts 11, 11, and is grounded by a lead wire 12. When the outdoor side is used as a shield surface, it is sufficient to directly ground the surface plate of one panel using the lead wire 12. Therefore, the entire shield surface of this shield chamber is electrically connected and grounded.

That is, electromagnetic waves are shielded, the internal charging potential is lowered, and it is possible to prevent dust and the like from adhering to the wall surface due to static electricity. Moreover, since the joints are filled with the adhesive 2, moisture does not enter the side of the panel, and deterioration of the core material due to moisture can be prevented. The electromagnetic wave shielding effect of this embodiment is as follows. 500KHz
For electromagnetic waves, an external electric field of 90 dB will have an internal electric field of 10 dB, resulting in an attenuation of 80 dB.For high frequencies, under almost the same conditions, the attenuation will be 62 dB for 200 MHz.
All exhibited a shielding effect of 54 dB against 750 MHz, more than 50%.

[Effect of idea]

As described above, the present invention uses a structure in which the joints of adjacent panels are sealed with a conductive adhesive when a room is constructed using panels that use conductive surface plates on at least one side. Even when used, there is no need to use a large number of screws, etc., unlike conventional ones, making construction easier, sealing electromagnetic waves, and ensuring watertightness.

Furthermore, since the panel is grounded, the charged potential inside the room can be lowered and the adhesion of dust and the like can be prevented.

Moreover, the present invention has a structure in which a space is formed where the panel frames butt each other, and the space is filled with adhesive, making it easy to fill the space with adhesive.
A good finish can be achieved.

In addition, since the surface plates are connected using adhesive,
Even if the surface plate expands and contracts due to heat, it can follow the expansion and contraction, and there is no risk of breakage or the like.

Furthermore, since the structure is such that the joints are filled using an adhesive, it can be used for a wide variety of panels regardless of the shape of the panel.

Furthermore, since the adhesive is not made of metal, the surface plate is not deteriorated by electrical contact, and has excellent durability.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a panel joint according to an embodiment of the present invention, and FIG. 2 is a sectional view of the panel at a grounding point. 1... Panel, 2... Adhesive, 3... Heartwood, 4
...Surface plate, 5...Frame, 5a...Outer clamping piece, 8...
...Tube, 9...Bolt, 11...Natsuto.

Claims (1)

[Scope of utility model registration request] In an electromagnetic shielding room in which a wall is constructed by arranging panels in which at least one side of the two inner and outer surface plates sandwiching the core material is made of conductive material, the panels are placed close to each other with the periphery of both surface plates at almost right angles. It is formed by bending the bent edge so as to form a groove, and inserting the bent peripheral part into the groove of a frame with grooves formed at both ends. By using a device that keeps the tips of the outer clamping pieces at a lower position than the positions of both front panels of the panel, when the panels are butted together at the frame part, there is a space above the tips of the outer clamping pieces of both panels. This space is filled with a conductive adhesive to electrically connect the entire wall, and the surface plate of at least one of the conductive surface plates is grounded. Features an electromagnetic shield room.