JPH01120099A - Radio-wave shielding room - Google Patents

Abstract

PURPOSE:To obtain a radio-wave shielding see-through window which is easy to see through and whose shielding effect is high by a method wherein a superconducting thin film is formed on a glass sheet. CONSTITUTION:Superconducting thin films 13, 15 are formed on glass sheets 12, 16; a radio-wave shielding room 9 is constituted by using the glass sheets. For example, a radio-wave shielding see-through window 10 of the radio-wave shielding room 9 is constituted by an inside glass sheet 12, an inside superconducting thin film 13, dry air 14, an outside superconducting thin film 15 and an outside glass sheet 16. By this setup, radio waves are shut out completely by using the superconducting thin film 15 on the side to which the radio waves come; in addition, a visible ray is transmitted through the inside glass sheet 12, the inside superconducting thin film 13, the dry air 14, the outside superconducting thin film 15 and the outside glass sheet 16; accordingly, it is possible to see through the inside of the radio-wave shielding room 9 through the radio-wave shielding see-through window 10. As a result, it is possible to obtain the shielding room whose electromagnetic-wave shielding performance is good and whose see-through effect is high.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a radio wave shield room.

[Conventional technology]

Fig. 6 is an external view showing a conventional radio wave shield room. This is the door for entering and exiting room fil.Figure I!7 shows the radio wave shield transparent window (
2) is a cross-sectional view of 14) i metal lattice wire mesh, f5+H glass, f61t! It's dry air.

Next, the operation will be explained. Radio waves from the outside are filtered through the outer metal grid (4) at approximately 50 MHz in the target frequency band.
After receiving attenuation of about dB, it reaches the inner metal grid (8). Furthermore, the inside metal grid (8) also receives about 50 dB of attenuation, and the receiver penetrates into the radio wave shield room (1) with a total attenuation of about 100 dB. Furthermore, the glass plate hardly attenuates the radio waves. 'Radio wave shield transparent window (2
) are covered with double metal plates (not shown).
00d Receives attenuation of 8 or more.

Inner glass for visible light (7), inner metal grid wire mesh (8)
.

Since the dry air C6) passes through the outer metal grid (4) and the outer glass plate (5), the inside of the radio shield room (1) can be seen through the radio shield transparent window (2).

[Problem that the invention seeks to solve]

Conventional radio wave shield viewing windows are constructed as described above, so a considerable portion of visible light is blocked by the inner and outer metal lattice mesh, and at the same time, light from the outside is scattered by the metal lattice mesh, so It would be very difficult to see if the lighting was dim.
However, the shielding effect was also limited by the performance of the radio shielding window.

This invention was made to solve the above-mentioned problems, and an object thereof is to obtain a radio wave shielding viewing window that is easy to see through and has a high shielding effect.

[Means for solving problems]

In the radio wave shield transparent window according to the present invention, a superconducting thin film is provided on a glass plate to block radio waves while transmitting visible light.

[Effect]

The superconducting thin film in this invention has zero electric resistance as a property of superconductors, so it completely blocks radio waves, does not have zero electric resistance up to the frequency of visible light, and exhibits the properties lX of a metal oxide thin film and is transparent. becomes.

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

In FIG. 1, (9) is a radio wave shield room, [1.

( is a radio wave shield transparent window, (Ill is a door. In Figure 2, +12) H inner glass plate, o31i inner superconducting thin film, (14 is dry air, (+511'! outer superconducting thin film, 0 (2 ) is the outer glass plate.

In the radio wave shield transparent window configured as described above, radio waves are completely blocked by the superconducting thin film 051 on the radio wave arrival side. Visible light is transmitted through the inner glass plate (12).

It passes through the inner superconducting thin film (13), dry air (14, outer superconducting thin film 06), and the outer glass root wall, so it passes through the radio shield transparent window +io+ and enters the radio shield room (
You can see through the inside of 91. The reason why the superconducting thin film was provided in two layers here was to prevent the leakage of radio waves from imperfections such as pinholes and uneven formation during the process of forming the superconducting thin film on the glass plate, and also to prevent the leakage of radio waves from imperfections such as pinholes and uneven formation, and to provide shielding around the windows. This is to double prevent leakage at the connection with the metal plate.

In Figure 5, the glass plate □□□ is attached to the normal conducting transparent thin film beam.
If one wave is applied so that the temperature does not fall below the dew point, Joule heat can be used to remove the fog caused by dew when used on the window of a constant temperature oven. In Figure 5, (22 is a glass plate, @ is a superconducting thin film.) In the above example, a superconducting thin film is provided on one side of the glass, and two sheets are stacked with the superconducting thin film on the inside. However, for use as a simple shield, only one superconducting thin film Oη may be used, or superconducting thin films Oη may be provided on both sides of the glass plate 0 as shown in FIG.

As shown in Figure 3, as much of the area of the radio shield room as possible is made up of radio shield transparent windows.
It has the effect of improving radio wave shielding performance and see-through performance.

〔Effect of the invention〕

As described above, according to the present invention, since the radio wave shielding is configured to be related to the superconducting thin film on the glass plate, it is possible to obtain good radio wave shielding performance and a high see-through effect.

[Brief explanation of the drawing]

Fig. 1 is an external view showing a radio shield room according to an embodiment of the present invention, Fig. 2 is a sectional view of a radio shield transparent window according to an embodiment of the invention, and Fig. 3 is another embodiment of the invention. FIG. 4 is a cross-sectional view of a radio wave shield transparent window showing another embodiment of the present invention.
Fig. 5 is a sectional view of a radio shielded transparent window showing another embodiment of the present invention, Fig. 6 is an external view of a conventional radio shielded room, and Fig. 7 is a sectional view of a conventional radio shielded transparent window. be. In the figure, (1.( is a radio wave shield transparent window, +12+ is an inner glass plate, Oj is an inner superconducting thin film, (In is an outer superconducting thin film, 0 is an outer glass plate, - is a radio wave shield transparent window,
0η is a superconducting thin film, 081fl glass plate, (21+ is a normal conducting transparent thin film or glass plate, * is a superconducting thin film. In the figures, the same reference numerals indicate the same or corresponding parts.

Claims (2)

[Claims] (1) A radio wave shield room characterized by using a superconducting thin film produced on a glass plate. (2) The radio wave shield room according to claim 1, which has a normal conductive thin film on at least one surface.