JPH0648956Y2 - Sheet for electromagnetic shield - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an electromagnetic wave shielding sheet for temporary use.

(Prior Art) Conventionally, in construction involving electromagnetic wave generation, an electromagnetic shielding material such as a metal (steel, copper, aluminum, etc.) plate, foil, conductive plastic plate, etc. is used for temporary partitions for electromagnetic shielding. This is done by partitioning or by applying a conductive paint to the partition plate.

(Problems to be solved by the invention) However, in the structure of the above configuration, it is troublesome to expand to a wide surface or process into a complicated shape, and moreover, electromagnetic waves are likely to leak from the connection portion between the electromagnetic shielding materials, Further, there is a problem that the device is adversely affected by the intrusion of dust or the generation of dust due to processing.

Therefore, the present invention solves the problems of the prior art and provides an electromagnetic shield sheet that can be easily used as a temporary partition.

(Means for Solving the Problems) In order to solve the above problems, the present invention deposits an electromagnetic shielding film on an insulating sheet and enables another insulating sheet to be peeled off, for example, adhesive or partial adhesion. , Partial welding or laminated using the adhesive force of the laminating material itself.

(Operation) Since a thin and light sheet for electromagnetic shielding is obtained in this way, handling and connection between sheets are easy, and short circuit due to contact with equipment can be prevented. Further, since the insulating sheet can be easily peeled off, the ground can be taken out easily.

(Embodiment) FIG. 1 is a sectional view showing an embodiment of the present invention.
Is a base material 10-300 μm resinous insulating sheet, 2 is an electromagnetic shielding film of copper, aluminum, iron, etc. of about 150-800 Å deposited on the insulating sheet 1, 3 is an adhesive, 4 is an insulating sheet 1 It is a similar resinous insulating sheet. In the figure, the insulating sheet 4 is entirely bonded to the electromagnetic shielding film 2 with the adhesive 3 so that it can be peeled off. However, partial adhesion or partial fusion or the adhesive force of the insulating sheet 4 itself is used. Then, they may be detachably joined.

In this way, (a). Since the sheet has the electromagnetic shielding film 2, the electromagnetic shielding can be performed on a wide surface.
(B). Since both outer side surfaces of the electromagnetic shielding film 2 are sandwiched by the insulating sheets 1 and 4, the electromagnetic shielding film 2 is protected, and the electromagnetic shielding film 2 is prevented from being broken from external damage and thus electromagnetic waves from leaking. In addition, even in an environment with many electric parts, short-circuiting due to contact with equipment can be prevented and work can be performed safely. Moreover, it is suitable for partitioning because it blocks out dust from processing and does not generate dust. (C). Since the electromagnetic shielding film 2 is obtained by vapor deposition, the film thickness can be reduced to about 150 to 800 Å, and the light transmitting property can be obtained. (D). The thickness of the entire sheet is 300μ
It can also be less than or equal to m, which results in a thinner sheet and is easier to handle. (E). The insulating sheet and the pressure-sensitive adhesives and adhesives used as auxiliary agents are flexible and the electromagnetic shielding film 2 is also very thin, so that the sheet as a whole has flexibility, is easy to process, and can be set according to the situation at the site. (F). Since the adhesiveness, the partial adhesion, the partial welding, and the adhesive force of the laminate material itself are used for joining the electromagnetic shielding film 2 and the insulating sheet 4 which is the laminate material,
You can easily expose the electromagnetic shielding film 2 at the edge of the sheet,
It can be covered with an insulating sheet again, and due to its characteristics, it can not only maintain electrical continuity between multiple sheets, but also can connect without leaking electromagnetic waves, so it can be applied to a wide surface and cope with complicated shapes It will be possible. Moreover, the ground can be easily taken out from the sheet.

Therefore, it can be applied to a work partition in a place where it is desired to block electromagnetic waves from the outside such as an electric room, an exchange equipment room, an electronic device room, and an LSI factory.

Further, both outer surfaces or one surface of the sheet is further covered with a flame-retardant material or a non-combustible material by laminating or the like, or the insulating sheets 1 and 4 themselves are made to have a flame-retardant or non-flammable property so that further work can be performed. You can get the safety and fire protection of the compartment. Specifically, in order to impart flame retardancy, use flame retardant materials such as flame retarded polyethylene, PVC,
Add flame-retardant material. Further, a non-combustible material such as glass cloth is used to provide non-combustibility.

FIG. 2 is a measurement example of the electromagnetic wave shielding effect of the embodiment of the present invention.
A indicates an electric field, and B indicates a magnetic field. This measurement example is the electromagnetic shielding film 2
According to the measurement result by the shield material evaluation device (TR17301 Takeda Riken Kogyo Co., Ltd.) when copper is 800 Å, the electric field has a shielding effect of 40 dB or more between 1 and 100 MHz. Magnetic fields have little effect.

Similar to FIG. 2, FIG. 3 is a measurement example of the electromagnetic wave shielding effect of the embodiment of the present invention, in which the electromagnetic shielding film 2 is 800 Å of aluminum. Electric field is 40 dB or more at 1 to 30 MHz, 30 to 100
Has a shielding effect of 30 dB or more at MHz.

(Effect of the Invention) As described in detail above, the present invention covers the electromagnetic shielding film formed by vapor deposition with the insulating sheet, so that it effectively shields electromagnetic waves and shields dust, etc., and is thin, light, and flexible. It has the effect that it can be retained and can be made transparent.

Further, since the insulating sheet can be peeled off, the electromagnetic shielding film can be easily exposed and covered, and the plurality of sheets can be connected while maintaining the electromagnetic shielding effect. Therefore, it is possible to easily perform planar expansion, support for complicated shapes, and machining / lathing such as taking out the ground. In addition, by covering the outer surface of the sheet with a flame-retardant material or a non-combustible material, or by making the insulating sheet itself flame-retardant and non-flammable, it is possible to enhance the safety of work and the fire resistance of the compartment. Furthermore, the ease of restoration, which is one of the conditions for temporary materials, can be dealt with in a shorter time than with paint or the like.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of an electromagnetic shielding sheet of the present invention, FIG. 2 is an electromagnetic shielding effect diagram when copper is used for the electromagnetic shielding film of the present invention, and FIG. 3 is also using aluminum. It is an electromagnetic shielding effect figure in the case. 1 ... Insulating sheet, 2 ... Electromagnetic shielding film, 3 ... Adhesive,
4 ... Insulation sheet.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Takeshi Furukawa 3-9-11 Midoricho, Musashino City, Tokyo Inside Nippon Telegraph and Telephone Corporation Musashino Electro-Communications Research Laboratory (72) Kazuo Oshima 3-9 Midoricho, Musashino City, Tokyo No. 11 within the Musashino Electro-Communications Research Laboratories, Nippon Telegraph and Telephone Corporation (72) Seiji Aokawa 5-7-8 Shiba, Minato-ku, Tokyo Hibiya General Facilities Co., Ltd. (72) Masakazu Shimokawa 5 Shiba, Minato-ku, Tokyo 37-88 Hibiya General Equipment Co., Ltd. (72) Inventor Tsuneo Takeda 5-37 Shiba, Minato-ku, Tokyo Hibiya General Equipment Co., Ltd. (72) Shigeo Ueno 5-37 Shiba, Minato-ku, Tokyo No. 8 Hibiya General Equipment Co., Ltd. (72) Inventor Chiman Nakamura 1-2-1 Marunouchi, Chiyoda-ku, Tokyo Inside Jabico Co., Ltd. (56) References JP-A-58-106899 (JP, A) JP-A-58-16599 (JP, A)

Claims (1)

[Scope of utility model registration request] 1. A sheet for electromagnetic shielding used for temporary construction, 150 to 800 Å on a resin insulating sheet of 10 to 300 μm.
An electromagnetic shielding sheet, which is obtained by laminating another insulating sheet on a translucent electromagnetic shielding film formed by vapor deposition of the above electromagnetic shielding material by peelable entire surface or partial bonding.