JPH03228850A - Radio wave absorbing glass and structure of light transmission part of buiding - Google Patents

Abstract

PURPOSE:To improve radio wave absorpting performance by providing a radio wave absorption layer together with a radio wave reflection layer in the direction of thickness of the glass body through which light is transmitted in the direction of thickness. CONSTITUTION:The radio wave absorption glass 1 is, as shown in Fig.1, constituted of the radio wave absorption layer 5 and the radio wave reflection layer 6. The radio wave absorption layer 5 is made in such a way that liquified compound ferrite made by mixing ferrite powder with a high molecular material is applied and dried on one surface of a glass plate 4 of base material to form various pattern as shown in Fig.2 and Fig.3 so that the occupied area is >=50%. The radio wave reflection layer 6 is constituted of a thin film formed of metal, SnO2, etc., by spattering, etc., on the other surface. The incident wave W1 from the outside to this radio wave absorption glass 1 is attenuated by the radio wave absorption layer 3, and almost all the attenuated incident wave W1 is reflected by the radio wave reflection layer 6 and discharged to the outside as reflected wave WR after attenuated again by the radio wave absorption layer 5. A very little amount of transmitted wave WT invades into the inner part.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a glass such as a glass plate for a window of a building or a glass blank for an exterior wall, and a structure of a light transmitting part of a building using this glass.

[Conventional technology]

BACKGROUND ART Conventionally, in areas surrounding buildings such as high-rise buildings, radio wave reflection interference caused by television radio waves and the like has been a problem. That is, as shown in Fig. 7, an incident wave (Ml) such as a TV radio wave that is incident on a high-rise building (B) at a certain angle is reflected by the building's outer surface as a reflected wave (WR), and the building (B) )
A radio interference range (G) was forming in the surrounding area. Therefore, it has been considered to bury radio wave absorbers in the outer walls of buildings in order to prevent the building from reflecting radio waves such as television waves from the surrounding area.

[Problem to be solved by the invention]

However, on the outer periphery of the building, not only the exterior walls are exposed, but also light transmitting parts using glass bodies such as glass windows and glass blocks for exterior walls are exposed over a wide area, and these glass bodies If ordinary transparent glass is used, most of the radio waves will pass through the building, so the entire building will be electromagnetically blocked. This has caused radio wave intrusion problems such as EMI noise in intelligent buildings, which can cause computers to malfunction. Another problem is that the radio waves that have passed through and entered the building are reflected by desks, lockers, bookshelves, etc. inside the building, and a considerable proportion of the radio waves exit the building as reflected waves. Therefore, in order to prevent radio waves from entering the building, it is possible to use electromagnetic wave shielding glass or high heat ray reflective glass as the glass body, but in such a case, a large proportion of radio waves will be reflected, so the building There was a problem in that it was impossible to avoid the spread of radio wave reflection interference to surrounding areas.

An object of the present invention is to provide a radio wave absorbing glass capable of preventing both radio wave reflection interference and radio wave intrusion interference as described above, and a structure of a light transmitting part of a building using the glass.

[Means to solve the problem]

In order to achieve the above object, the first characteristic configuration of the radio wave absorbing glass according to the present invention is that a radio wave absorbing layer and a radio wave reflecting layer are provided side by side in the thickness direction of a glass body that transmits light in the thickness direction. It's what I did.

Also, preferably, the second radio wave absorbing glass according to the present invention
The characteristic configuration is that in the first characteristic configuration, the glass body is formed of a glass plate, and the radio wave absorption layer and the radio wave reflection layer are provided separately on both sides of the glass plate.

Furthermore, desirably, a third feature of the radio wave absorbing glass according to the present invention is that in the first feature, the glass body is formed of at least two plate parts, and the radio wave absorbing layer is formed of one of the plate parts. This is because it was set in between.

Furthermore, preferably, a fourth feature of the radio wave absorbing glass according to the present invention is that in the third feature, the radio wave absorbing layer and the radio wave reflecting layer are separately provided on opposing surfaces of the plate portion. There is a particular thing.

Furthermore, preferably, a fifth characteristic configuration of the radio wave absorbing glass according to the present invention is that in the third characteristic configuration, a liquid having a high dielectric constant is sealed between the plate parts to configure the radio wave absorbing layer. It is in.

Further, the characteristic configuration of the structure of the light transmitting part of the building according to the present invention is as follows:
The radio wave absorbing glass according to any one of the first to fifth characteristic configurations is attached to a wall of a building so that light is transmitted through the radio wave absorbing glass, and the radio wave absorbing layer is made larger than the radio wave reflecting layer. This is because it is placed closer to the source of radio waves.

[Function] According to the first characteristic configuration of the radio wave absorbing glass according to the present invention, by providing the radio wave reflecting layer, the radio waves incident on the glass body in the thickness direction are more or less affected by the radio wave reflecting layer. Since a portion of the light is reflected, almost no light is transmitted to the other side. Moreover, since the radio wave absorbing layer and the radio wave reflecting layer are provided side by side in the thickness direction of the glass body, the radio wave incident from the radio wave absorbing layer side has a long path to the radio wave reflecting layer and a radio wave reflection. The wave is attenuated by the radio wave absorbing layer both in the process of being reflected by the layer and heading toward the incident side again. In other words, although it is a single layer of radio wave absorption layer, it can obtain the radio wave attenuation effect equivalent to that of two layers and sufficiently prevent radio wave reflection failure, and at the same time, almost no radio waves are transmitted through it, and as a result, Most of the incident radio waves can be absorbed by the radio wave absorbing glass itself.

Furthermore, according to the second characteristic configuration of the radio wave absorbing glass according to the present invention, a glass plate is interposed between the radio wave absorbing layer and the radio wave reflecting layer, so that, as described above in the first characteristic configuration, Since the incident radio waves always pass through the glass plate twice, reflection of the radio waves can be further suppressed. Moreover,
Since the radio wave absorbing layer and the radio wave reflecting layer do not overlap directly, the finished state of one layer does not affect the other in the process of producing radio wave absorbing glass, which is advantageous in terms of production.

On the other hand, according to the third feature of the radio wave absorbing glass according to the present invention, the glass body is formed of at least two plate parts, and the radio wave absorbing layer is provided between the plate parts. The radio wave absorbing layer is not exposed to the outside of the glass body, and its deterioration can be suppressed.

According to the fourth feature of the radio wave absorbing glass according to the present invention, the radio wave absorbing layer and the radio wave reflecting layer are separately provided on the opposing surfaces of the plate portion, so that both of these layers are provided separately. is not exposed to the outside, and its deterioration can be suppressed. Moreover, in the case where the two plate parts are each made of a separate glass plate, even if one of the layers fails to be installed, only the glass plate on which that layer is provided will be defective. However, the production yield can be improved.

Furthermore, according to the fifth characteristic configuration of the radio wave absorbing glass according to the present invention, since the radio wave absorbing layer is constructed by sealing a liquid with a high dielectric constant between the plate parts, this kind of layer Compared to the case where a thin film is formed, the variation in radio wave absorption effect between products is reduced. Moreover, there are many types of transparent liquids such as water, which have high dielectric constants.
By using these liquids, the transmittance of the radio wave absorbing glass can be maintained sufficiently high.

Further, according to the characteristic configuration of the structure of the light transmitting part of the building according to the present invention, the radio wave absorbing glass that exhibits the above-mentioned effect can be used.
Since it is attached to the wall of the building so that light is transmitted through the radio wave absorbing glass, the radio wave reflecting layer can effectively prevent incident waves from outside the building from entering the building. Since the radio wave absorbing layer is disposed closer to the radio wave generation source than the radio wave reflecting layer, the above-mentioned radio wave absorbing effect exerted by the radio wave absorbing layer causes the incident waves to be absorbed by the radio wave absorbing glass itself. is absorbed by the building and is not reflected around the building.

〔Effect of the invention〕

As described above, according to the present invention, it has been possible to provide a radio wave absorbing glass that can absorb almost all incident radio waves. Using such radio wave absorbing glass, it has now become possible to provide a building lighting structure that can prevent both radio wave reflection interference and radio wave intrusion interference.

〔Example〕

Next, a first embodiment of the present invention will be described with reference to FIGS. 1 to 3.

FIG. 1 shows a longitudinal cross-sectional view of a glass window (3) in the outer wall (2) of a building, manufactured using radio wave absorbing glass (1). The radio wave absorbing glass (1) is formed by separately providing a radio wave absorbing layer (5) and a radio wave reflecting layer (6) on each surface of a glass plate (4) which is a glass body serving as a base material. Then, this radio wave absorbing glass (1) is added to the radio wave absorbing layer (5).
is attached to the wall of the building via an aluminum sash (7) so as to face the outside, which is the radio wave generation source (0), rather than the radio wave reflecting layer (6), thereby forming a glass window (3) which is the light transmitting part of the building. . That is, while fitting the peripheral end of the radio wave absorbing glass (1) into the groove (8) of this aluminum sash (7),
Backup material (10) is packed between the two houses (9) and a glass plate (4) is fixed therein. Further, a sealing material (lla) is applied on both the bank up materials (10).
, (llb) to prevent rainwater from entering. Incidentally, in order to electrically connect the radio wave reflective layer (6) and the aluminum sash (7), a conductive sealing material is used as the sealant (ILa) on the radio wave reflective layer (6) side.

The radio wave reflecting layer (6) directed toward the inside of the building is made of a material such as metal, 5N02, ITO, etc., and is formed on the glass plate (4) by a method such as sputtering, CVD, or vacuum deposition.
A thin film is formed on the surface of the . On the other hand, the radio wave absorbing layer (5) directed toward the outside of the building is formed by coating the surface of the glass plate (4) with a liquid composite ferrite material made by mixing ferrite powder with a polymer material and then drying it. It is formed by letting Then, the magnetic loss of the mixed ferrite is utilized to absorb radio waves, as will be described later. The formation pattern of the radio wave absorbing layer (5) is as follows:
A striped pattern shown in the figure or a lattice pattern shown in FIG. 3 can be used. In any of these patterns, in order to sufficiently absorb radio waves, it is desirable to ensure that the area occupied by the composite ferrite material is 50% or more. In addition, the radio waves that cause the above-mentioned radio wave reflection interference and radio wave intrusion interference in high-rise buildings are particularly in the 90 to 770 range.
This is a radio wave in the MHz TEL Ruby band, but in most cases the electric field component of this type of radio wave is horizontally polarized parallel to the ground.
In normal areas, it is sufficient to form the radio wave absorbing layer (5) in the striped pattern. but,
In areas where the plane of polarization of the radio waves is twisted with respect to the ground, it is desirable to form the radio wave absorbing layer (5) in the grid pattern.

Next, the radio wave absorbing glass (1) configured as described above
The radio wave absorption effect will be explained. As shown in FIG. 1, an incident wave (W I ) entering the radio wave absorbing glass (1) from the outside of the building passes through the radio wave absorbing layer (5) during the journey to the radio wave reflecting layer (6). is attenuated by Most of the attenuated incident wave (WT) is reflected by the radio wave reflecting layer (6), and even during the journey toward the incident side, the reflected wave is attenuated again by the radio wave absorbing layer (5). (WR) is released to the outside of the building.

In other words, the incident wave (W+) is absorbed by the radio wave in both the journey to the radio wave reflection layer (6) and the journey to the radio wave reflection layer (6) and back to the incident side. It is attenuated by the layer (5) and most of it is absorbed by the radio wave absorbing glass (1). In the figure, (W T ) is a very small amount of transmitted waves that penetrate into the inside of the building.

Here, a comparative example of the performance of the radio wave absorbing glass (1) described above and a conventional general glass plate and a radio wave reflecting glass plate provided with only the radio wave reflecting layer (6) will be described. Conventional glass plates include float glass, heat-absorbing glass, heat-reflecting glass, and the like. Also, Pl is the incident wave (W T )
, P2 is the energy of the reflected wave (WR), and PO is the energy of the transmitted wave (WT). Then, based on these values, the amount of radio wave shielding performance and the amount of radio wave return loss are determined.

Radio wave shielding performance amount -10・log (P 1/P O
) Radio wave return attenuation ff=10-l og (PI/P2
) Next, concrete values are shown.

(A) Radio wave shielding performance of the radio wave absorbing glass according to the present invention -30 to 40 dB Radio wave return loss -15 to 20 dB (B) Conventional glass plate radio wave shielding performance #Odr3 Radio wave return loss -15 to 20 dB (C) Radio wave return loss of the radio wave reflective glass plate -15 to 20 dB Radio wave shielding performance 10 to 60 dB From these results, it is found that according to the above radio wave absorbing glass according to the present invention, the reflected energy of radio waves is is approximately the same as that of a conventional general glass plate, and it is understood that radio wave reflection interference to the environment around the building is sufficiently suppressed. or,
According to the above-mentioned radio wave absorbing glass (1) according to the present invention, the transmitted energy of radio waves is significantly smaller than that of conventional general glass plates, and it is understood that radio wave intrusion obstacles are overcome. .

[Another Embodiment Next, still another embodiment of the present invention will be described. Note that the same members as in the first embodiment described above are given the same numbers.

First, in the second embodiment shown in FIG. 4, the glass body is divided into two plate parts, that is, two glass plates (13),
(14) It is constructed of double-glazed glass. The radio wave absorbing layer (5) and the radio wave reflecting layer (6) are formed on the opposing surfaces of these two glass plates (13) and (14).
are provided separately, and a spacer (15) is interposed between the opposing surfaces to form an air layer. Furthermore, a conductor (16) is attached to the end of the radio wave absorbing glass (4) thus formed, and then a metallic channel body (17) is fitted onto the end of the radio wave absorbing glass (4). )
The aluminum sash (7) and the radio wave reflective layer (6)
) are electrically connected.

Next, in the third embodiment shown in FIG. 5, the glass body (4) is constructed of double-glazed glass, similar to the second embodiment. And two glass plates in double glazing (13)
, (14) is filled with water (5a), which is a liquid with a high dielectric constant, to form the radio wave absorbing layer. On the other hand, the type 5 wave reflecting layer (6) is provided on the surface of the glass plate (13) on the inside of the building in order to avoid contact with water (5a). Note that as the liquid forming the radio wave absorbing layer (5a), a liquid such as acetone, methyl alcohol, ethyl alcohol, nitrohenzene, etc. may be used instead of water.

Next, the fourth embodiment shown in FIG.
Unlike the embodiment, a glass block (19) provided at an opening in an outer wall (2) of a building is used as the glass body of the radio wave absorbing glass (1).

This glass block (19) is integrally formed in a hollow shape using glass, and has two parts that transmit light in the thickness direction.
two plate parts (20), (21,) and this plate part (20)
, (21) and a peripheral portion (22) connecting the peripheral portions of the peripheral portions. Further, as in the third embodiment, water (5a) is filled in the hollow part, and the radio wave reflecting layer is provided on the surface of the plate part 20) facing the inside of the building and the - part of the peripheral part (22). (6) are provided consecutively.

A metal frame (23) is installed in the opening of the building outer wall (2).
A plurality of vertical blade ribs (24) made of metal are attached in the vertical direction within this frame (23). And between these vertical blade bones (24),
A plurality of radio wave absorbing glasses (1) are piled up, and mortar (25 ) and glue, and then add back-up material (1) to the joint (26) where mortar (25) is exposed
0) and sealants (Ila) and (llb) are packed in this order to form a light transmitting part (3) of a building that transmits light through the radio wave absorbing glass (1). This mortar (25) is mixed with a substance that absorbs the radio waves, while the joint (26) facing the inside of the building
A conductive sealant is used as the sealant (lla) packed in the conductive sealant (lla).
a) is adhered to the radio wave reflective layer (6) provided on a part of the peripheral portion (22) to electrically connect the radio wave absorbing glasses (1) to each other and the frame (23). . That is, the configuration of the joints (26) allows the above-mentioned radio wave absorption effect to be produced between the radio wave absorbing glasses (1).

Next, further examples of the present invention will be listed.

(B) In the second to fourth embodiments described above, the plate parts (14) and (21
) is formed using glass with a low dielectric constant, such as quartz glass, the reflection of radio waves toward the outside of the building can be further suppressed. In addition, the surface resistance value of the plate parts (14) and (21) placed on the outside of the building is set to the same resistance value as the impedance in the air, that is, 3 per unit area.
A similar effect can be obtained by setting it to about 77 ohms.

(b) In all of the above embodiments, the radio wave absorbing layer (5) and the radio wave reflecting layer (6) were constructed so as not to be in direct contact with each other, but the radio wave absorbing layer (5) and the radio wave reflecting layer (6
) may be in direct contact with each other.

(c) In all of the above-mentioned embodiments, the present invention was implemented on the outer wall (2) of the building, but it may also be implemented on the wall inside the building. For example, if the present invention is applied to a partition wall between a computer room and another room, various problems caused by electromagnetic noise can be avoided.

Note that although reference numerals are written in the claims for convenience of comparison with the drawings, the present invention is not limited to the structure of the accompanying drawings by the reference numerals.

[Brief explanation of drawings]

1 to 3 show an example of the structure of a light transmitting part of a building using radio wave absorbing glass according to the present invention, in which FIG. 1 is a vertical cross-sectional view of a window, FIGS. 2 and 3 are FIG. 2 is a plan view of the main parts of radio wave absorbing glass. Figures 4 to 6 show another embodiment, and Figures 4 and 5 are longitudinal cross-sectional views of a glass window using double-glazed glass, and Figure 6 is a vertical cross-sectional view of a wall using glass blocks. be. FIG. 7 is a diagram showing a conventional radio wave 9 interference situation near a high-rise building. (4)...Glass body, (5)...Radio wave absorbing layer, (6)......Radio wave reflecting layer.

Claims (1)

[Claims] 1. A radio wave absorbing device in which a radio wave absorbing layer (5) and a radio wave reflecting layer (6) are provided side by side in the thickness direction of a glass body (4) that transmits light in the thickness direction. glass. 2. The radio wave absorption device according to claim 1, wherein the glass body (4) is formed of a glass plate, and the radio wave absorption layer (5) and the radio wave reflection layer (6) are separately provided on both sides of the glass plate. glass. 3. The glass body (4) is attached to at least two plate parts (13
), (14), (20), (21), and the radio wave absorbing layer (5) is formed by the plate portions (13), (14), (20).
, (21). 4. The radio wave absorbing glass according to claim 3, wherein the radio wave absorbing layer (5) and the radio wave reflecting layer (6) are separately provided on opposing surfaces of the plate parts (13) and (14). 5. The liquid (5a) with a high dielectric constant is applied to the plate part (13), (
4. The radio wave absorbing glass according to claim 3, wherein said radio wave absorbing layer (5) is formed by sealing between said radio wave absorbing layer (5). 6. The radio wave absorbing glass (1) according to any one of claims 1 to 5 is attached to a wall (2) of a building so as to transmit light through the radio wave absorbing glass (1), and A structure of a light transmitting part of a building in which an absorbing layer (5) is disposed closer to a radio wave generation source (0) than the radio wave reflecting layer (6).