JPH08169730A - Glass plate enhanced in comfortability - Google Patents

Abstract

PURPOSE: To obtain a glass plate having well-balanced transparency, mirror property and insulating property with a simple film structure, etc., good for the human body comfortability and environment, exhibiting a light-bluish glass face-reflected color tone and capable of transmitting an electric wave. CONSTITUTION: A thin-film layer is formed on the surface of this glass plate. A TiNx thin film having 7.5-11.0nm thickness as a first layer and an SnOx thin film having 40-55nm thickness as a second layer are simultaneously laminated on the glass surface, the visible light transmittance is controlled to 57-63%, the visible light reflectance between the glass surface and film surface to <=25% and the visible light reflectance difference to <=6.0%, and further the thermal shielding coefficient is controlled to <=0.77. A glass plate enhanced in comfortability is obtained in this way.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention coats a simple two-layer laminated film to give a well-balanced transparency, mirror effect and heat insulating property of a glass plate, and at the same time, satisfy the requirements. A glass plate that is eco-friendly and has a glass-like appearance and presence, and has a light blue glass surface reflection color tone and radio wave transmission that enhances habitability. The present invention provides a glass plate excellent in habitability and environment, which can make full use of its function in the use of.

[0002]

2. Description of the Related Art In general, many high performance heat ray reflective glasses having a high reflectance have been proposed and commercialized. Among them, there are infrared ray reflective glasses having a high transmittance, and further, non-reflective glass and the like are known. There is.

For example, Japanese Laid-Open Patent Publication No. 63-134232 describes an infrared reflecting article having a high transmittance, in which a transparent oxide first layer and a silver first layer are successively formed on a transparent substrate from the substrate side. Two
Layer, a third layer of transparent oxide, a fourth layer of silver, and a fifth layer of transparent oxide, the infrared reflective article provided with a five-layer coating, wherein the thickness of the silver layer is 11 nm or less, It is disclosed that the light transmittance is 70% or more, and as an example, for example, glass substrate / TiO ₂ (film thickness 35 nm) / Ag (film thickness 10 nm)
/ TiO ₂ (film thickness 70 nm) / Ag (film thickness 10 nm) / TiO ₂ (film thickness 35 n
m), visible light transmittance is 78.7%, visible light reflectance is 8.5
%, The solar energy transmittance is 53.2%, the solar energy reflectance is 28.2%, the reflectance at 10μ is 95%, and the reflected color is green.It has high reflectance in the infrared region and high transmittance in the visible region. However, it is described that the reflection color can be changed quite freely.

Further, for example, in JP-A-63-218513.
Is TiO_XThe thin film and the optical element using it are described
Cage, molecular formula: TiO_X(However, 1 <x <2)
Thin film titanium oxide based material, and the thin film on the substrate
A formed optical element is disclosed, which uses TiO 2 as an evaporation source.
Once the inside of the vacuum chamber is made high vacuum, oxygen gas
To introduce oxygen partial pressure of 5 × 10^-3~ 8 x 10^-FourSet to Torr
Formed on the substrate by vacuum evaporation to produce a purple color.
In addition to not presenting and not charging, especially
On synthetic resin substrates, the thin film peels off from the substrate along with the skin layer
If the film thickness is 0.001 to 20 μm,
The folding rate nd is 2.2 to 2.4, and
PMMA substrate / TiO_X(1 <x <2) [Film thickness 488 nm, nd
= 2.32], colorless and transparent, with no charge and good adhesion,
PMMA substrate / TiO_X(1 <x <2) [Film thickness 488 nm, nd = 2.3
2] / SiO_X[Film thickness 488 nm, nd = 1.46] or PMMA group
Plate / SiO _X(1 <x <2) [Film thickness 550nm, nd = 1.65] / T
iO_X(1 <x <2) [film thickness 550nm, nd = 2.32] / SiO
_X[Film thickness 550 nm, nd = 1.46] anti-reflection film, PMMA
Substrate / SiO_X(1 <x <2) [film thickness 632.8nm nd = 1.46]
/ TiO_XThe opposite of (1 <x <2) [film thickness 632.8 nm, nd = 2.3]
A spray film is disclosed.

[0005]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In the infrared reflective article disclosed in each of the above-mentioned conventional publications and having a high transmittance as disclosed in, for example, JP-A-63-134232, five layers and multiple layers are used. Even if it is complicated and has a high reflectance in the infrared region and a high transmittance in the visible region, since it has a silver layer, it has poor chemical resistance or weather resistance and is not suitable for use as a single plate. . In addition, it is necessary to use a transparent oxide layer to prevent reflection of the silver layer in the visible region, and to increase the transmittance in the visible region by utilizing an optical interference effect. Since it is difficult to say that the film is laminated with a total film thickness of 140 nm and the productivity is excellent, and because it is a radio wave shielding property due to the silver layer, it is not necessarily a simple film structure, and it is enough to appeal to glassiness. Among them, it has well-balanced optical characteristics,
Moreover, it is hard to say that it has radio wave transparency.

Further, for example, in the TiO _X thin film and the optical element using the same described in JP-A-63-218513, the TiO _X (1 <x <2) thin film formed by the vacuum deposition method is used at the time of film formation and It is hard to say that it is sufficiently stable after the film is formed, and there is concern about durability such as chemical resistance, weather resistance, and abrasion resistance, and it is not always easy to use it outdoors such as a window material for construction.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of such problems as described above, and the present invention is a combination of the specified simple film structure and its film thickness. By specifying the light reflectance and the thermal shielding coefficient,
It has a well-balanced optical property, while exhibiting a glass-like appearance and exhibiting transparency, appearance, designability, see-through property, mirror property and heat insulation property, and chemical resistance, weather resistance or abrasion resistance. It is possible to provide at low cost a glass plate that has durability such as properties, exhibits a soft pale blue-based glass surface reflection color tone, and has radio wave transparency and enhanced comfortability.

That is, according to the present invention, in a glass plate having a thin film layer formed on its surface, a TiNx thin film having a film thickness of 7.5 nm or more and 11.0 nm or less as a first layer from the glass surface side, and a second layer on the first layer. It is composed of a laminated film of SnOx thin films having a thickness of 40 nm or more and 55 nm or less as a layer, the visible light transmittance is 57 to 63%, and the visible light reflectance of the glass surface and the film surface is 25% or less and A glass plate with enhanced habitability, characterized in that the visible light reflectance difference between the glass surface and the film surface is 6.0% or less and the thermal shielding coefficient is 0.77 or less.

Further, the above-mentioned glass plate with enhanced habitability is characterized in that the stimulus purity of the glass plate with enhanced habitability is 19% or less. Furthermore, the transparent substrate has a plate thickness of 5 to 19 mm.

Furthermore, the above-mentioned glass plate with improved habitability is provided with the above-mentioned glass plate with improved habitability, characterized in that it has radio wave permeability. Here, as the glass plate, for example, as an architectural window material, an inorganic glass plate body which is commercially available soda lime glass used for various glass plate bodies such as buildings, etc., especially float glass is most suitable. It may be a so-called glass plate made of an organic material such as polycarbonate or acrylic, or a flat plate or bent plate glass, and further various processed glass such as tempered glass, laminated glass, double glazing and surface treated glass. Alternatively, it may be glass for various purposes. The shape of the glass plate is not particularly limited, but a substantially quadrangular shape having long sides and short sides can be most preferably adopted.

Further, in the glass plate having a thin film layer formed on the surface, the thin film layer is the first layer from the glass surface side, the TiNx thin film having a film thickness of 7.5 nm or more and 11.0 nm or less, and the first layer on the first layer. The second layer is made of a laminated film of SnOx thin films having a thickness of 40 nm or more and 55 nm or less. First, TiNx (x is determined by the flow rate ratio of Ar gas and N ₂ gas during sputtering. For example, x = 0.5. ~ 1.0) For thin films, while securing a shielding coefficient of 0.77 or less, which is the thermal performance of heat absorbing glass,
For other optical characteristics, for example, it can be made as high as the visible light reflectance of the optical characteristics of heat ray reflective glass,
It is suitable for mass production as a functional film with heat insulating properties and has good adhesion to glass, so it is selected as the first layer. Next, for SnOx (1 <x ≤ 2) thin film, it becomes a protective film of TiNx thin film to enhance durability and is also useful as an interference film. As one of the comfortability, the visible light reflectance of the glass surface is 25 %
Since low reflection performance as below is required, the visible light reflectance on the glass surface is less affected than the TiOx thin film and TaOx thin film in the structure of the heat insulating thin film / oxide thin film, and other oxide thin films can be used. The film forming speed is faster and the productivity is superior, so it is selected as the second layer. The two-layer laminated film of the both has a simple film structure and does not require a complicated process, so that the cost can be reduced.

The thickness of the TiNx thin film layer is 7.5 nm or more.
11.0 nm or less, the thickness of the SnOx thin film layer is 40 nm or more and 55 nm
The following is SnOx when the thickness of the TiNx thin film layer is less than 7.5 nm.
If the thickness of the thin film layer is less than 40 nm, for example, the visible light transmittance exceeds 63% and the transparency becomes strong, and the shielding coefficient that is thermal performance exceeds 0.77 and the heat insulation becomes unsatisfactory. If the thickness of the TiNx thin film layer is more than 11.0 nm and the thickness of the SnOx thin film layer is more than 55 nm, the visible light transmittance is particularly low and the visible light reflectance is too high. This is because the visible light reflectance difference between the film surface and the film surface greatly exceeds 6.0%, and it cannot be said that the glass plate is extremely comfortable. Preferably, the thickness of the TiNx thin film layer is 7.5 nm or more and 10.5 nm or less, and the thickness of the SnOx thin film layer is
It is about 40 nm or more and 50 nm or less.

Further, the visible light transmittance is 57 to 63%, the average visible light reflectance between the glass surface and the film surface is 25% or less, and the visible light reflectance difference between the glass surface and the film surface is 6.0% or less. Furthermore, the reason why the thermal shielding coefficient is 0.77 or less is that the visible light transmittance is less than 57% or the visible light reflectance is 25%.
In the range of more than%, the visible light reflection performance, especially the reflection performance of the glass surface becomes too high, the transparency is lowered, and the visible light transmittance exceeds 63% or the thermal shielding coefficient is 0.77 or more in the range. Reflection performance deteriorates too much, and it becomes impossible to obtain a predetermined mirror effect.
This is because when the shielding coefficient exceeds 60% or the thermal performance exceeds 0.77, the desired heat insulation cannot be achieved.

The visible light reflectance difference between the glass surface and the film surface is 6.
The reason why it is set to 0% or less is that there is a problem that the transparent performance is not utilized when the visible light reflectance difference exceeds 6.0%, such as absorption in glass or multiple reflection. The visible light reflectance difference is preferably about 5.7% or less, more preferably about 5.0% or less, and the transparency and the mirror property are more remarkably balanced.

The thermal shielding coefficient of 0.77 or less is ensured by providing the laminated thin film glass with the visible light transmittance, the visible light reflectance, the shielding coefficient and the like of the heat ray absorbing glass. This is because the heat insulating property is imparted in the process.

Generally, the optical characteristics are a combination of transmittance, reflectance and absorptance, and there are different surfaces depending on the balance, but within the above range, the transmittance and reflectance, that is, the mirror property and the heat insulating property are obtained. At the same time, it is well-balanced and friendly to people and the environment, and can be more comfortable to live in.

Furthermore, the reason why the stimulation purity is set to 19% or less is that if the stimulation purity exceeds 19%, a glaring feeling is likely to appear even in consideration of visible light reflectance and heat insulation. This is because it is easy for people to feel uncomfortable and it is difficult to say that it is kind to people and the environment.

Furthermore, the reason why the glass plate having radio wave transmission property is used is that the radio wave reflection type glass plate causes a so-called radio wave interference such as a ghost phenomenon on the TV in the surrounding residents.
Furthermore, the laminated film of the thin film is a combination of the TiNx thin film and the SnOx thin film, because the glass surface reflection tone has a slightly bluish tint, even if the transmitted light has a tone close to the neutral tone. Yes 2
In terms of design, the layer also has the desired visible light transparency and the required transparency, and also has the desired visible light reflectivity so as to appropriately provide the mirror effect, and also imparts heat insulation. Because you can.

Furthermore, the plate thickness of the transparent substrate is 5 to 5.
The reason why it is 19 mm is that, for example, if it is 4 mm or less, it cannot be used as an outer wall material for buildings in view of wind load, and if it exceeds 19 mm, the absorptivity in the glass becomes high, so the transmittance and reflection It is not possible to satisfy both sides of the rate at the same time. A preferable plate thickness is, for example, about 6 to 15 mm.

[0020]

As described above, according to the glass plate of the present invention with improved comfortability, in the glass plate having the thin film layer formed on the surface of the transparent substrate, the film thickness of the first layer from the glass surface side is 7.
TiNx thin film with a thickness of 5 nm or more and 11.0 nm or less, a second layer on the first layer
It is composed of a laminated film of SnOx thin films having a thickness of 40 nm or more and 55 nm or less as a layer, the visible light transmittance is 57 to 63%, and the visible light reflectance of the glass surface and the film surface is 25% or less and The visible light reflectance difference between the glass surface and the film surface is 6.0% or less, and the thermal shielding coefficient is 0.77 or less. While utilizing the properties of heat-reflecting glass and the properties of heat-reflecting glass, it is possible to exhibit properties comparable to those of heat-absorbing glass, exhibiting a glass-like appearance and appealing the design, and expressing transparency, presence, and transparency and mirror property. Among them, it has a well-balanced optical characteristic including heat insulation and is satisfactory at the same time. It has durability such as chemical resistance, weather resistance or abrasion resistance, and has a light blue glass surface reflection color tone. Present and radio wave It is possible to provide a glass plate with a high degree of living comfortably at a low cost with a simple film structure, etc. For example, in a courtyard, a mirror property that can make the inside of the building look larger It is possible to achieve transparency and at the same time, it has the effect of being comfortable and optimal for people and the environment, such as enjoying the night view from the room in a hotel while having an energy saving effect.

[0021]

The present invention will be described below in detail with reference to examples. However, the present invention is not limited to the embodiment.

Example 1 Float clear glass having a size of 300 × 300 mm ² and a thickness of 6 mm
(Fl6) is washed with a neutral detergent, water rinse, isopropyl alcohol in order, dried, and then set so that it can reciprocate upwards facing the Ti and Sn targets set in the vacuum chamber of the DC magnetron sputtering system. Then, after degassing the inside of the tank with a vacuum pump to about 5 × 10 ⁻⁶ Torr,
In the vacuum chamber, N ₂ gas and Ar gas (however, the gas flow rate ratio of Ar gas and N ₂ gas has a value of N ₂ / (Ar + N ₂ ) of 0.5 to 1.0 (note that
When the value is 1.0, the Ar gas flow rate is zero). ] To maintain the vacuum at about 2 × 10 ⁻³ Torr,
A power of about 1.0 kW was applied to the Ti target, and the DC magnetron reactive sputtering with the mixed gas was performed to
By transporting the plate glass at a speed of about 340 mm / min above the Ti target, TiNx with a thickness of about 10 nm can be obtained.
(For example, x is about 0.8) A thin film was formed as the first layer. After the film formation was completed, the application to the Ti target was stopped.

Next, the plate glass is placed in the vacuum chamber.
Approximately 5 × 10 inside the tank with a vacuum pump^-6Up to Torr
After degassing to₂Gas and Ar gas (however, Ar
Gas and O₂Gas flow rate ratio of gas is O₂/ (Ar + O₂) Has a value of 0.5 to
1.0 (Note that the Ar gas flow rate is zero when the value is 1.0)
It should be in the range of. ] To introduce a vacuum of about 2 × 10 ^-3
Hold on to Torr and apply about 1.0kw power to the Sn target.
Apply the DC magnetron reaction spatter with the mixed gas.
Speed above the target of Sn.
By transporting the sheet glass at 182 mm / min
About 50 nm thick SnOx (1 <
x ≦ 2) A thin film was laminated and formed as a second layer. Film formation is completed
After that, the application to the Sn target was stopped.

Regarding the obtained laminated glass with thin film,
Visible light transmittance (Tv: 380-780nm), visible light reflectance (R
v: 380-780nm), visible light reflectance difference, stimulation purity (Pv: 3
80 to 780nm) and solar radiation transmittance (Ts: 340 to 1800n)
m) and solar reflectance (Rs: 340 to 1800 nm), etc.
Type self-recording spectrophotometer (manufactured by Hitachi, Ltd.), each data of transmittance and reflectance for each predetermined wavelength and JIS Z 8722,
According to JIS R 3106, its optical characteristics (light source: D
₆₅ 2 ° visual field) was determined, and a part of them was shown in Table 1 for visible light transmittance, average visible light reflectance, visible light reflectance difference, and stimulus purity.

As for the thermal performance, the solar heat gain rate was calculated based on JIS R 3106, and the solar heat gain rate (η value = glass that was exposed to the solar radiation of the sun) of a 3 mm thick float plate glass (transparent). From the above, the relative value of the solar heat gain coefficient was calculated when the numerical value indicating how much solar radiation enters the room = 0.88) was set as 1, and shown as the shading coefficient (SC). Incidentally, for example, the solar radiation transmittance of a float plate glass (transparent) having a thickness of 3 mm is about 0.86. Also, for example, the shielding coefficient (S.
C.) is about 0.95.

The durability is based on JIS R 3221, and for the chemical resistance test, 1 for each of acid and alkali.
It was evaluated by the change amount (ΔTs,%) of the visible light transmittance after being dipped in a 25 ° C. solution for about 6 hours. For example, if ΔTs was 4.0% or less, it was regarded as acceptable. For the Taber test,
The wear wheel (CS-10F), a load of 500 g, and the amount of change in visible light transmittance (ΔTs,%) after 100 rotations were evaluated. For example, ΔTs was 4.
If it was 0% or less, it was determined to be acceptable.

Regarding the surface resistivity, those with a resistance of 10 ⁵ Ω / port or less are four-point probe resistance measuring device RT-8 (manufactured by NAPSON),
10 ⁵ Ω / port to 10 ⁵ MΩ / port for the surface high resistance meter HIREST
It was measured by A HT-210 (manufactured by Mitsubishi Petrochemical Co., Ltd.), and one having a resistance of 1 kΩ / mouth or more was determined to have radio wave transparency.

[0028] Furthermore, the ones having good cost in consideration of productivity and the glass plate having desired habitability from the above-mentioned characteristics and appearances are given as a comprehensive evaluation. Those that are not expected are shown in Table 1 by crosses.

As a result, G (glass) / TiNx (10 nm) / Sn
As shown in Table 1, the glass plate with a laminated thin film composed of Ox (50 nm) and a two-layer film has a visible light transmittance (Tv) of 61.3%,
The visible light reflectance (Rv) on the glass surface is 24.3%, the visible light reflectance difference (△ Rv) between the glass surface and the film surface is 4.9%, and the stimulus purity on the glass surface is 13.9%. It has a well-balanced mirror effect, is kind to people and the environment, and has thermal insulation properties such as a solar radiation transmittance (Ts) of 55.4% and a shielding coefficient (SC) of 0.74. It also greatly reduces the cooling load, for example. It is a thing.

Further, the durability, for example, the chemical resistance and the change amount (ΔTs) of the visible light transmittance in the Taber test are also about
It was a glass plate that passed 0.5% or less, had a light blue reflection tone on the glass surface, had radio wave transparency, and had a desired comfort level.

Examples 2 to 3 As shown in Table 1, only the plate thickness of the float clear glass in Example 1 was 8 mm (Fl8) in Example 2 and 12 in Example 3.
mm (FL12) was used, and a laminated glass with laminated thin film similar to that of Example 1 was obtained in the same manner as in Example 1 with the same film structure.

With respect to the obtained laminated glass with laminated thin film, each measurement was performed using each device in the same manner as in Example 1 and evaluated.
As a result, as shown in Table 1, the obtained laminated glass with laminated thin film had a slight decrease in visible light transmittance and a decrease in visible light reflectance as the plate thickness increased. Although the visible light reflectance difference of the surface is decreased and the solar radiation transmittance and the shielding coefficient are slightly decreased, the color tone and the radio wave transmittance are all within the intended values, and the results are shown in Example 1. Similarly, it was a glass plate with a desired habitability.

Examples 4 to 7 As in Example 1, a float clear glass (Fl) having a thickness of 6 mm was used.
6) was used, and with the same film configuration as in Example 1, only the film thickness was changed to a value as shown in Table 1 to obtain a plate glass with a laminated thin film.

The plate glass with a laminated thin film thus obtained was measured and evaluated in the same manner as in Example 1 using each device.
As a result, the obtained laminated glass with laminated thin film was as shown in Table 1, and each optical property such as visible light transmittance, visible light reflectance, visible light reflectance difference and stimulus purity was the same as in Example 1. Of course, the thermal conductivity such as the solar radiation transmittance and the shielding coefficient, the color tone, and the radio wave transmission were all within the desired range, and the glass plate was a desired habitability.

Comparative Example 1 A film was formed on a plate glass in the same manner as in Example 1, and as shown in Table 1, the TiNx thin film had a thickness of about 7.5 nm and the SnOx thin film had a thickness of about 60 nm, which was slightly thicker. did.

The glass with a laminated thin film thus obtained was measured and evaluated in the same manner as in Example 1 using each device. As a result, the laminated glass with laminated thin film has a visible light reflectance of more than 25% on the glass surface side and a visible light reflectance difference of more than 6.0% between the glass surface and the film surface, resulting in too much mirror property. It is hard to say that it is well-balanced and there is a feeling of glare, so it was not always possible to say that it is a glass plate that has improved the desired habitability.

Comparative Example 2 A film was formed on a plate glass in the same manner as in Example 1, and as shown in Table 1, the thickness of the TiNx thin film was slightly reduced to about 5.5 nm, and Sn was used.
The thickness of the Ox thin film was set to about 40 nm.

The glass with a laminated thin film thus obtained was measured and evaluated in the same manner as in Example 1 using each device. As a result, the laminated glass with laminated thin film has a visible light transmittance of more than 63% and a shielding coefficient of 0.77 which is a thermal performance, and it cannot be said that it is a glass plate with improved desired habitability. It was a thing.

Comparative Example 3 A film was formed on a plate glass in the same manner as in Example 1, and as shown in Table 1, the thickness of the TiNx thin film was set to about 11.5 nm, which was slightly thicker.
The film thickness of the Ox thin film was about 60 nm, which was slightly thicker.

The glass with a laminated thin film thus obtained was measured and evaluated in the same manner as in Example 1 using each device. As a result, in the laminated glass with laminated thin film, the visible light reflectance on the glass surface side greatly exceeds 25% and the visible light reflectance difference between the glass surface and the film surface greatly exceeds 6.0%, and the mirror property is too high. It was hard to say that it was a well-balanced thing, it was hard to say that it was friendly to people and the environment, and it was hard to say that it was a glass plate that has improved the desired habitability.

Comparative Example 4 As shown in Table 1, the same plate glass as in Example 1 was used,
In the same manner as in Example 1, only the Ti target was set and the plate glass was conveyed at a speed of about 286 mm / min to form a TiNx thin film having a thickness of about 9.5 nm as the first layer.
After the film formation was completed, the application to the Ti target was stopped.

Then, the plate glass is placed in the vacuum chamber.
Approximately 5 × 10 inside the tank with a vacuum pump^-6Up to Torr
After degassing to₂Gas and Ar gas (however, Ar
Gas and O₂Gas flow rate ratio of gas is O₂/ (Ar + O₂) Has a value of 0.5 to
1.0 (Note that the Ar gas flow rate is zero when the value is 1.0)
It should be in the range of. ] To introduce a vacuum of about 2 × 10 ^-3
Hold on to Torr and apply about 3.0kw power to the Ti target.
Apply the DC magnetron reaction spatter with the mixed gas.
Speed above the target of Sn.
By transporting the plate glass at 93 mm / min,
Approximately 30 nm thick TiOx (1 <
x ≦ 2) A thin film was laminated and formed as a second layer. Film formation is completed
After that, the application to the Ti target was stopped.

The glass with a laminated thin film thus obtained was measured and evaluated in the same manner as in Example 1 using each device. As a result, the glass sheet with laminated thin film has a visible light transmittance of less than 57%, a visible light reflectance on the glass surface side of more than 25%, and a stimulus purity of the glass surface of more than 19%. It is hard to say that it is environmentally friendly to people and the environment, and it is hard to say that it is a glass plate that has improved the desired habitability.

[0044]

[Table 1]

[0045]

As described above, according to the present invention,
The film structure of the glass plate having the laminated thin film layer formed on the surface and the film thickness thereof are specified, and the visible light transmittance, the visible light reflectance and the visible light reflectance difference, and the thermal shielding coefficient are specified. As a result, the glass-likeness can be sufficiently exhibited to appeal the design, and the transparency and the presence, as well as the transparency and the mirror property, can be achieved at the same time in a well-balanced manner with the heat insulation property, and the durability is provided. It is possible to provide a glass plate that is friendly to people and the environment and has enhanced habitability at a low cost with a simple film structure, such as a neutral blue transmission color tone with a light blue color tone and a radio wave transmission property. The present invention provides a glass plate excellent in habitability and environmental performance, which exhibits its function not only as a window material for construction but also in various applications such as a building.

Claims (4)

[Claims] 1. A glass plate having a thin film layer formed on the surface thereof, having a film thickness of 7.5 nm or more as the first layer from the glass surface side.
It consists of a TiNx thin film with a thickness of 1.0 nm or less and a SnOx thin film with a thickness of 40 nm or more and 55 nm or less as a second layer on the first layer, and has a visible light transmittance of 57 to 63%. The visible light reflectance between the glass surface and the film surface is 25% or less, the visible light reflectance difference between the glass surface and the film surface is 6.0% or less, and the thermal shielding coefficient is 0.77 or less. A glass plate with improved habitability. 2. The glass sheet with enhanced habitability according to claim 1, wherein the glass sheet with enhanced habitability has a stimulation purity of 19% or less. 3. The glass plate with enhanced habitability according to claim 1, wherein the transparent substrate has a plate thickness of 5 to 19 mm. 4. The glass plate with enhanced habitability according to claim 1, wherein the glass plate with enhanced habitability has radio wave transparency.