JP2862452B2 - Heat ray reflective glass with radio wave transmission characteristics - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is intended to prevent radio waves from being obstructed by buildings and the like, transmit radio waves efficiently, and make it look as if it were coated on the entire surface. And a heat ray reflective glass exhibiting

[0002]

2. Description of the Related Art In recent years, ghost interference due to reflection of a building has become a problem in receiving television radio waves, and providing a ferrite radio wave absorber on a concrete wall or the like of a building has been put into practical use.

On the other hand, window glasses are gradually becoming thicker, and more and more are provided with functions such as coating a film of a metal or a metal oxide or attaching a film having such a film to a heat insulating property. Tends to. Although the effect of thickness is not so large, coating a film that has higher reflectivity to radio waves than glass or attaching a film will result in a very high reflectivity, for example, and there is an inevitable side to radio interference. Was.

Accordingly, in such a case, the window in the direction of arrival of the radio wave must be provided with uncoated glass, and the inconsistency of different colors in the same building cannot be avoided. In some cases, the heat insulation effect of the windows of the entire building had to be reduced.

[0005] Therefore, as described in Japanese Patent Application No. 3-215609, which has already been filed by the present applicant, a heat-reflecting glass having a low-reflecting property of radio waves has been proposed as one having heat ray reflecting performance and radio wave transmitting performance. I have.

[0006]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above points, and is intended to reduce the reflectivity of radio waves such as TV broadcast waves, so that it can be said that radio wave interference does not occur. Has a value of radio wave reflectance as close as possible to that of an uncoated glass sheet and has sufficient heat insulating performance. In particular, Japanese Patent Application No. Hei 3-2156 filed by the present applicant.
SUMMARY OF THE INVENTION It is an object of the present invention to provide a heat ray reflective glass having more flexible radio wave transmission characteristics with respect to the width of a dividing groove in the patch dividing method described in JP-A-09-0909.

[0007]

As described above, in particular, even if the width (aperture width) of the dividing groove of the patch dividing method is, for example, 0 mm, that is, the dividing is not visible in appearance, in some cases, The present invention is to efficiently provide a heat ray reflective glass having a radio wave transmission characteristic capable of remarkably reducing radio wave reflection and realizing radio wave transmission equivalent to that of the uncoated glass itself even if such overlapping occurs.

[0008] That is, the present invention relates to a heat ray reflective glass in which a film, a film or a plate having a high heat ray reflectivity is adhered to a substrate, wherein the film, the film or the plate is covered with an insulating layer on the surface. The film, the film or the plate has a surface resistivity of 500 Ω / port or less, and the radio wave arriving at the tape or the film, the film or the plate. The width of the tape or the square parallel to the direction of the electric field is set to be 1/20 or less of the wavelength λ of the radio wave and the solar radiation transmittance is set to 60% or less. Heat ray reflective glass.

[0009] Further, the heat ray reflective glass having the above-mentioned radio wave transmission characteristics, wherein the tape-like or square-like film, the film or the plate-like body is attached so that the distance between the films is 0 to 5 mm. The heat ray reflective glass having the above-mentioned radio wave transmission characteristics, wherein the tape-like or square-shaped film, the film or the plate-like body is adhered so as to overlap at least.

[0010] Further, the heat ray reflective glass having the above-mentioned radio wave transmission characteristic, wherein the tape-shaped or square-shaped film, film or plate-like body has a stripe-shaped or lattice-shaped shape.

[0011] Further, the thickness of the insulating layer coated on the heat-ray reflective conductive tape-like or square-shaped film, film or plate-like body is 0.1 μm or more. The present invention provides a heat-reflective glass having the same.

Here, the reason why the surface resistivity of the tape-like or square film, film or plate having high heat ray reflectance is 500 Ω / port or less is that the surface resistivity is 1 kΩ / port, for example. If the above is the case, the reflectivity of the radio wave is low, but the heat insulation performance is reduced. Therefore, if the surface resistivity is 1 kΩ / port or less, the reflectivity of the radio wave is gradually increased, and the heat insulation performance is reduced. On the other hand, both the radio wave reflectance and the solar radiation transmittance were set to good values of 500 Ω / port or less. It is preferably 400 Ω / port or less, more preferably 350 Ω / port or less. For example, in high heat insulating glass including not only blocking of sunlight but also heat insulation by reflection of infrared rays, reflection of infrared rays is due to plasma vibration. Since the reflectance is governed by the surface resistance of the film, the surface resistivity of the sputtered film needs to be 500 Ω / port or less.

In particular, in LOW-E glass having a surface resistivity of several ohms / mouth, reflection obstruction becomes a serious problem. In LOW-E glass mainly used in cold regions, daylight is actively taken in. For this reason, the solar radiation transmittance is higher than that of ordinary heat insulating glass (for example, trade name: Sky Cool), but the reflectance of infrared rays is very high.

The tape-like or square film, film or plate having a high heat ray reflectivity may be a single layer or a multilayer.
It is about 0 ° or less, preferably about 800 ° or less, more preferably about 500 ° or less.

Further, the reason why the solar radiation transmittance is set to 60% or less is that if it exceeds 60%, the heat insulating effect is not always sufficient, and preferably about 50% or less, more preferably about 50% or less. About 5 to 40%, which is almost the same as ordinary heat insulating glass (for example, trade name: Sky Cool).

Next, the width of the tape or square parallel to the electric field direction of the arriving radio wave on the tape-like or square film, film or plate-like body is set to one of the wavelength λ of the radio wave.
The reason why the width of the tape is set to be not more than / 20 times is, for example, as already proposed by the present applicant, because the width of the tape may be not more than 1/3 times, preferably not more than 1/4 times the wavelength λ of the radio wave. However, in order to achieve the above-mentioned intended purpose even under severer environments or conditions, it is necessary to reduce the ratio to 1/20 or less, preferably 1/30 or less.

For example, in the case of a thin film having a thickness of about 300 °, the absorption of radio waves is negligible, and the decrease in the shielding effect is a phenomenon that occurs as a result of a decrease in radio wave reflectance.

Further, the interval between the tape-shaped or square-shaped films, films or plates is 0 to 5 mm.
Regarding that it is to be adhered, as the width of the interval is larger, the radio interference is reduced, but for example, among those having relatively low resistance among ordinary high heat insulation products,
Surface resistivity is about 50Ω / mouth and solar transmittance is about 6-7
%, And the radio wave reflectance is about 56% (frequency 200%).
(In MHz), the reduction in heat insulation performance due to the division of the heat insulating film is limited to about 3%, for example, from about 7% to about 19%, and preferably to about 14%, for example. Desirably, in addition, when the width of the interval is 5 mm or more, designability and the like are also likely to be gradually lost, and is 5 mm or less, preferably about 3 mm or less,
More preferably, it is 1/1500 mm or less of the wavelength λ of the incoming radio wave (corresponding to about 1 mm or less at 200 MHz).
It is.

That is, preferably, the width of the groove parallel to the direction of the electric field of the arriving radio wave is 0 to 3 mm, and the width of the groove perpendicular to the direction is 0. 3 mm.
01 to 3 mm, more preferably the width of the parallel groove is 0.
Although the width of the orthogonal groove is 0.03 to 3 mm, even if the tape-like or rectangular film, the film or the plate-like body is stuck so as to overlap at least, the radio wave is sufficient. This allows the film to pass through, and can be viewed as if a heat-ray reflective conductive film, film or plate-like body was adhered to the entire surface, and could be made to have much better design, heat insulating performance, and ultraviolet shielding properties.

In the case of horizontal polarization, the width of the space in the horizontal direction may be zero. In the case of vertical polarization, the width of the space in the vertical direction may be zero.
It may be in a grid pattern.

Further, regarding the lower limit of the width of the stripe, for example, in the case of the above-mentioned ordinary high heat insulation product,
When the solar radiation transmittance is about 5 to 30% and the frequency of the radio wave is 200 MHz, if the width of the interval is 0.5 mm, a heat insulating effect can be expected up to a stripe width of about 3 mm. Is about 2/1000 to 1/30 of the wavelength λ. If the width of the interval is further reduced, the lower limit is further reduced.

Further, the insulating layer coated on the heat-ray reflective conductive tape-like or square-shaped film, film or plate-shaped member may be any insulating resin having moisture permeability-preventing properties. It is even better if the resin has functionality such as ultraviolet shielding performance, specifically, for example, an epoxy resin, a polyester resin, a polyurethane resin, an alkyd resin, a melamine resin, a phenol resin, or a butyral resin. Is coated by a roll coating method, a flow coating method, a dipping method or the like, and the thickness is set to 0.1 μm or more because the tape-shaped or square-shaped film cannot be too thin from the viewpoint of strength. Even if the film or plate is stuck so that the peripheral part at least overlaps or happens to happen. Even now become such a pasting,
This is because it can sufficiently transmit radio waves, and is preferably a tape-shaped or square-shaped film having heat ray reflective conductivity, or a tape-shaped or square-shaped film which is adjacent to the film or plate through an insulating layer coated on the end surface of the film or plate. It is attached so that a shaped film, film or plate-like body is in close contact with or in contact with the film. It is preferably about 0.5 to 1000 μm, more preferably about 1 to 500 μm, and it goes without saying that it is not economical to make it extremely thick.

[0023]

The present inventors have conducted intensive studies to minimize radio interference caused by a plate-like body having a high reflectivity to radio waves such as heat insulating glass. Pay attention to the fact that the film, film or plate-shaped body is insulated from each other by dividing and affixing it as a tape-shaped or square-shaped object with an insulating layer, so that the same radio wave transmission as that of the patch-split system can be obtained. The present invention has been made.

As described above, the length (L) of the side parallel to the electric field direction of the arriving radio wave is divided and affixed to 1/20 times or less of the wavelength λ of the radio wave, and is adhered. It turned out to be a low radio wave reflection glass, and it was found that the amount of radio wave reflection was remarkably reduced, and the TV broadcast wave UH having a frequency of 770 MHz from the TV broadcast wave VHF band having a frequency of 90 MHz.
There is a similar tendency up to the entire F band.

This is considered to be due to the following reasons. That is, when a plane wave is incident on an arbitrary scatterer, a conductive current or a polarization current flows through the scatterer, which serves as a secondary radiation source, generates an electromagnetic wave, and reflects the electromagnetic wave. In reality, the electrons do not move from one end of the scatterer to the other, but only oscillate at some point in synchronization with the frequency of the incident electromagnetic wave.

A portion having a high electron concentration caused by such electron vibration moves. This is a factor that reflects electromagnetic waves. By dividing a plate-like body or the like to reduce L / λ or to obtain a state equivalent thereto,
It is presumed that the region where electrons can move freely becomes narrower, and as a result, the amount of reflection per unit area decreases.

In a range where the thickness of the heat ray reflective conductive film is relatively smaller than the wavelength of the arriving radio wave, for example, about 20
In the case of 0 MHz, even when the skin thickness is larger than about 5 μm, for example, about 1 mm, the radio wave will be transmitted by dividing and pasting as described above. It is the radio wave reflectance of radio waves.

In particular, even if the heat-reflective conductive tape-like or square-shaped film, the insulating layer coated on the film or the plate-like body may overlap the tape-like or square-shaped peripheral part. Since they are insulated from each other, they have a function equivalent to the above-mentioned spacing, thereby reducing radio wave reflection which cannot be obtained conventionally and transmitting the radio waves remarkably.

On the other hand, the heat insulation performance is as close as possible to the current high-performance heat-insulating glass by using a unique film, film or plate having a specific surface resistivity having a relatively high radio wave reflectance. In addition to the heat insulation effect, it is possible to achieve the same quality as the current high-performance heat insulating glass, and to cover the entire surface with a heat-ray reflective conductive tape-like or square film, film or plate-like body It can be achieved as described above, and it is extremely excellent in design and function.

That is, in the current high-performance insulating glass,
It solves difficulties in solving radio interference, eliminates the ghost phenomenon in TV images, reduces the load on cooling and heating, and has the same color tone as the current high-performance insulated glass, making it environmentally friendly and livable. An object of the present invention is to provide a heat ray reflective glass having excellent radio wave transmission characteristics.

[0031]

An embodiment of the present invention will be described below in detail with reference to the drawings. 1 and 2 are perspective views showing a part of a heat ray reflective glass having a radio wave transmission characteristic according to the present invention. FIG. 1 shows a tape type film with a heat ray reflective conductive film coated with an insulating layer in a stripe type. FIG. 2 shows a rectangular film with a heat-reflective conductive film coated with an insulating layer adhered in a grid pattern, and FIG. 3 shows a film adhered to a glass substrate. 1A is a cross-sectional view showing a configuration, wherein FIG. 1A is a side cross-sectional view of a tape-like film and a square film with a heat-ray reflective conductive film coated with an insulating layer, and FIG. Tape-like film made of a conductive film (transparent or non-transparent)
cm aluminum foil tape) and one side cross-section of a square film, and FIG. 4 is a partially enlarged cross-sectional view showing a bonded portion of the film.
(A) shows the one where the end faces are put together, and (B) shows the one where the peripheral parts are overlapped.

That is, the substrate 1 is about 520 mm square,
Using a float glass having a thickness of about 10 mm, a tape-like film 2 and a square film 3 coated with a heat-ray reflective conductive film 4 having heat insulation performance by a DC magnetron sputtering method, and an insulating layer 5 is coated by a dipping method, A description will be given of an example in which each of the float glass substrates 1 is affixed to the float glass substrate 1 to form a stripe type and a checkerboard type.

The coating film having the heat insulating property is formed by using a metal titanium as a target at about 10 ^-3 Torr.
r, the surface resistivity of the film is about 3 Ω / port and about 50 Ω / port in nitrogen gas and argon gas (the flow ratio of argon gas to nitrogen gas is in the range of 0/1 to 1/0). , About 1
00Ω / mouth, about 350Ω / mouth, about 500Ω / mouth, about 10
Six types of heat ray reflective conductive films 4 of 00Ω / port were produced.
The insulating layer is made of a polyester resin and has a thickness of about 5 μm.
It was a film of a degree.

Next, a tape-like film with a heat-reflective conductive sputtered film coated with the above-mentioned insulating layer was adhered, and FIG.
As shown in the figure, the stripe width (L + D) of the tape-like film 2 is about 25 mm, about 50 mm, about 100 mm,
Heat ray reflection glass plates each having a stripe shape of about 150 mm were produced.

The above-mentioned heat-reflective glass plate having a stripe shape is placed on a wall shared by an adjacent shield room for about 500 minutes.
A 25 mm square window was cut out to insulate about 25 mm (for example, 20 to 30 mm) around the heat ray reflective glass plate, and fixed and attached in a vertical state.

In the mounted state, the above-mentioned heat ray reflective glass plates are irradiated with a horizontally polarized wave having a frequency of 200 MHz.
When the radio wave transmission loss was measured, the effects shown in Table 1 were obtained.

[0037]

[Table 1]

As is clear from Table 1, for example, a glass substrate on which a 50-mm-wide tape-like film coated with a heat-ray reflective conductive film having a surface resistivity of about 50 Ω / port and covered with an insulating layer is stuck. The radio wave transmission loss is substantially equal to or less than that obtained by covering the entire surface with a heat ray reflective film having a surface resistivity of about 500Ω / port. That is, for example, according to the present embodiment, the solar radiation transmittance over the entire surface is about 50% while maintaining the solar transmittance at about 6% with a film having a relatively low surface resistance by dividing and sticking in a stripe type. The amount of radio wave reflection can be reduced to a level corresponding to a relatively high surface resistance, and the heat ray reflective glass has remarkable radio wave transmission characteristics.

Further, as described above, for example, in a heat ray reflective glass for construction, in order to efficiently shield heat rays, at least about 30 to 40% as the solar light transmittance due to the restriction of thermal properties such as the solar light transmittance. Is necessary, and for example, sunlight is reflected by the plasma oscillation of free electrons in the thin film, so the solar transmittance is also governed by the surface resistance of the thin film,
It satisfies, for example, that the surface resistivity of the coating film needs to be about 350 Ω / port or less to secure the solar transmittance of about 30%.

The thickness of the sputtered film in this embodiment is about 300 °, the radio wave absorption is negligible in the thin film, and the radio wave transmission loss is reduced as a result of the lowered radio wave reflectance. Is a phenomenon.

The present invention is not limited to the above-described preferred embodiments, and various applications are possible. A film or a film laminated on the substrate of the present invention has a surface resistivity of 1 kΩ if only radio wave reflection is low.
The effect can be expected as long as it has a surface resistivity of 500Ω or more.
Various known films and films having a thickness of not more than / Ω, preferably not more than about 400 Ω / mouth, and more preferably not more than 350 Ω / mouth, for example, aluminum foil (tape) and the like can be used. Further, the plate-like body laminated on the substrate may be a sheet glass, plastic or the like, or a construction material such as ceramics or concrete, or a metal having a high reflectance.
Further, for example, the high heat ray reflective film is divided and a surface having a low radio wave reflection is provided with a high surface resistance (for example, a surface resistivity of 1 kΩ).
Needless to say, a thin film having a thickness of at least / port, preferably at least 20 kΩ / port) may be coated as a protective film.

The length of the side parallel to the direction of the electric field of the arriving radio wave depends on the TV broadcast wave VHF band (90 MHz to 220 MHz) according to the frequency of the radio wave to be reduced in reflectivity.
In the case of up to z), for example, at a frequency of 90 MHz, the wavelength (3333 mm) / 20 is about 167 mm, and at the wavelength (3333 mm) / 30, about 111 mm.
At a frequency of 220 MHz and a wavelength (1364 mm) / 20, the wavelength is about 68 mm, and at a wavelength (1364 mm) / 30, the diameter is about 45 mm.
0 MHz to 770 MHz), for example, a frequency of 470 MHz and a wavelength (638 mm) / 20 of about 32 mm, and a wavelength (638 mm) / 30 of about 21 m
m, a wavelength (390 mm) at a frequency of 770 MHz /
If it is 20, it may be about 19 mm, and if it is wavelength (390 mm) / 30, it may be about 13 mm.

As the substrate, regardless of colorless or colored, a flat plate, a bent plate glass, various kinds of inorganic glass such as a strengthened or strengthened glass, and a radio wave reflection from the tape-like or square film, the film or the plate-like body. Any material having a low rate can be used, and various materials such as organic materials such as plastics and other inorganic materials can be used.

[0044]

The heat ray reflective glass of the present invention having a radio wave transmission characteristic is a highly conductive film having a relatively high heat ray reflection and a high radio wave reflectance, and a surface resistivity of 500Ω / port or less and a relatively low surface resistivity. And the width of the interval parallel to the direction of the electric field of the arriving radio wave is set to one of the wavelengths λ of the radio wave.
By using a tape-shaped or square-shaped film, film or plate-like body with a thickness of / 20 times or less, the solar radiation transmittance becomes 60% or less, and the radio wave reflectance is remarkably reduced.
Radio wave transmission equivalent to or almost similar to raw glass, radio wave interference is significantly reduced, and the heat insulation effect is equivalent to or approximately similar to the current high heat insulation products, and the entire surface is covered with a heat ray reflective conductive film. As a result, the whole can be made to have the same color tone, so that it is possible to improve the livability and the environment.

Therefore, for example, in a window of a building such as a building, a heat ray reflection glass having a radio wave transmitting property having a heat insulating property of the present invention is disposed on a window surface from which a radio wave arrives, and the other portion is conventionally used. If the ordinary heat ray reflective glass is provided, the entire building will have a higher heat insulating effect, and the same color tone can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a heat ray reflective glass having a radio wave transmission characteristic in which a tape-like film with a heat ray reflective conductive film covered with an insulating layer is stuck in a stripe type, according to one embodiment of the present invention.

FIG. 2 is a perspective view showing a heat ray reflective glass having a radio wave transmission characteristic in which a square film with a heat ray reflective conductive film covered with an insulating layer is adhered in a grid pattern according to another embodiment of the present invention. is there.

FIG. 3 is an embodiment of the present invention, wherein (A) is provided with a heat ray reflective conductive film coated with an insulating layer, and (B) is formed of a heat ray reflective conductive film coated with an insulating layer. It is sectional drawing which shows one side cross section of a tape-shaped film and a square film, respectively.

FIG. 4 is a partially enlarged cross-sectional view of a bonded portion when a tape-like film with a heat ray reflective conductive film covered with an insulating layer is bonded, according to an embodiment of the present invention. (A) is a diagram showing the end faces thereof, and (B) is a diagram showing the peripheral portions thereof superposed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Glass substrate 2 Tape film 3 Square film 4 Heat ray reflective conductive film 5 Insulating layer 6 Interval

Claims (5)

(57) [Claims] Claims: 1. A heat ray reflective glass in which a film, a film or a plate having a high heat ray reflectance is attached to a substrate.
The film, film or plate has a tape-like or square shape with a surface covered with an insulating layer, and the film, film or plate has a surface resistivity of 500 Ω /
Below the mouth, and the tape-like or square membrane,
The width of the tape or square parallel to the direction of the electric field of the arriving radio wave on the film or the plate-like body is set to １ ／ of the wavelength λ of the radio wave.
0 times or less, and the solar transmittance is 60
% Or less, which has radio wave transmission characteristics. 2. The heat ray reflective glass having radio wave transmission characteristics according to claim 1, wherein the tape-shaped or square-shaped film, film, or plate-shaped body is attached so that an interval between the tape-shaped or square-shaped film, the film, and the plate-shaped body is 0 to 5 mm. 3. The heat ray reflective glass having radio wave transmission characteristics according to claim 1, wherein the tape-shaped or square-shaped film, the film, or the plate-shaped body is adhered so that at least peripheral portions thereof overlap. 4. The heat ray reflective glass having radio wave transmission characteristics according to claim 1, wherein said tape-like or square-shaped film, film or plate-like body has a stripe-like or lattice-like shape. . 5. The method according to claim 1, wherein the thickness of the insulating layer coated on the heat-reflective conductive tape-shaped or square-shaped film, film or plate-shaped body is 0.1 μm or more. Heat ray reflective glass with the following radio wave transmission characteristics.