JPH06305774A - Heat ray reflective glass - Google Patents

Abstract

PURPOSE:To produce a heat ray reflective glass having bright green appearance, neutral in reflective color tone in room side and improved in designing ability and habitability by forming a nitride layer, an oxide layer and a nitride layer on a glass substrate. CONSTITUTION:The nitride layer 11, 20-180Angstrom in thickness, of at least one kind selected from nitrides of Ti, Cr, Zr, Ta, Hf or multiple nitrides mainly containing them, the oxide layer 12. 370-600Angstrom in thickness, of at least one kind selected from oxides of Ti, Sn, In, Zn, Zr, Ta, Hf or multiple oxides mainly containing them and the nitride layer 13, 90-200Angstrom in thickness, are formed on the blue heat ray absorptive glass substrate 10 having 450-495nm main wavelength to obtain the heat ray reflective glass having <=40% transmissivity in visual spectrum range.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat ray reflective glass for buildings or automobiles.

[0002]

2. Description of the Related Art In recent years, openings in buildings have tended to expand for design and comfort. Along with that, heat-reflecting glass is caused by factors such as an increase in the amount of sunlight entering and an increase in indoor cooling load, and an increase in the design importance of windows that occupy a large area in the exterior of a building. The number of cases of using is increasing rapidly.

The heat ray reflective glass used for this purpose is
It is usually called solar control glass and is distinguished from heat mirror glass for reducing the heating load in cold regions. Desirable properties of this solar control glass are 1) limiting the penetration of sunlight as described above, and 2) having a good design of the outdoor reflection color.

The solar control glass known so far has a visible light transmittance of about 5 to 40% in order to achieve the above point 1). In order to suppress the transmittance, it is necessary to make the metal film or the metal nitride film thicker, and it is difficult to control the color tone at the same time, which is not sufficient from the viewpoint of designability.

On the other hand, with the spread of heat-reflecting glass, there is an increasing tendency to seek color tones that are rich in individual expression and have high design. Green is one of the colors. So far, some heat ray reflective glasses exhibiting a green outdoor reflection color have been known. These can be roughly classified as follows according to their configurations.

(1) Three-layer system of oxide film / nitride film / oxide film (2) Two-layer system of oxide film / nitride or metal film (3) Utilizing reflection of green heat absorbing glass thing

(1) is the most general one, but when trying to produce a fresh green as an outdoor reflection color, the oxide layer becomes a significantly thick film, and it is necessary to have a thickness of 2000 to 3000 Å. Compared with about 500 Å, it takes a long takt time, and there are drawbacks such as a change in color tone due to the film thickness distribution. In (2), the film thickness can be made thin and a calm color can be produced, but it is difficult to produce a fresh color. Since (3) utilizes the fact that the green color of glass is reflected by a metallic film to make the color reflected from the outside green, it is necessary to use green heat ray absorption in order to produce a green color. It had the drawback that it was difficult to make different shades of the same green color.

[0008]

SUMMARY OF THE INVENTION The object of the present invention is to solve the above-mentioned drawbacks of the prior art and to provide a heat ray-reflecting glass in which the film is located on the indoor side, the outdoor side (glass substrate). The reflection color tone of the surface side is greenish,
Moreover, it is to provide various colors of glass.

[0009]

The present invention has been made to solve the above-mentioned problems, and a glass substrate is provided with a nitride as a first layer, an oxide as a second layer, and a nitride as a third layer on a glass substrate. The present invention provides a heat-reflecting glass, which is characterized in that it is formed sequentially and has a transmittance of 40% or less in the visible spectrum band.

FIG. 1 is a partial cross-sectional view of the heat ray reflective glass according to the present invention, in which 10 is a blue heat ray absorbing glass, 11 is a nitride layer formed as the first layer from the glass substrate 10, and 12 is An oxide film as a second layer and a nitride layer 13 as a third layer.

The material of the oxide layer in the heat ray reflective glass of the present invention is not particularly limited, but may be Ti, Sn, In, Z.
A material selected from the group consisting of oxides of n, Zr, Ta, Hf, Cr and the like and complex oxides containing these as the main components is preferably used. The material of the nitride layer in the present invention is
Although not particularly limited, at least one material selected from the group of nitrides such as Ti, Zr, Ta, Hf, and Cr and composite nitrides containing these as the main components is preferably used.

The present invention is characterized in that it is realized by synthesizing a color variation which cannot be obtained only by the constitution of the film, with the color of the heat ray absorbing glass as the substrate. That is, the film is laminated on the transparent substrate and the total thickness is about 150.
It is difficult to produce a desired green color at about 0 Å or less, but it is possible to create a yellowish green to yellowish color with a specific film configuration.

The specific film constitution means, specifically, that the thickness of the nitride of the first layer is 20 to 180Å, the thickness of the oxide of the second layer is 370 to 600Å, and the thickness of the nitride of the third layer is. 90-2
It is 00Å. In particular, a film structure in which the transmission color changes from yellow green to yellow, for example, a film structure having a main wavelength of about 550 nm to about 580 nm is preferable.

Further, as the glass substrate, a heat absorbing glass plate whose transmission color is blue is used, for example, a main wavelength is about 450 n.
Blue-based heat-absorbing glass plates with m to about 495 nm are preferred. By combining such a blue-based heat ray absorbing glass plate with a film having a yellowish to yellowish transmitted color, a variety of green colors can be obtained by synthesizing the colors of the glass substrate and the colors that can be created from the structure of the film. It is possible to easily create variations of.

The blue heat ray absorbing glass plate is, for example, a colored transparent glass made by adding a trace amount of cobalt to the components of the composition of ordinary plate glass or float glass and if necessary, a metal such as iron. A glass plate that absorbs light rays and solar radiation heat is used.

The method for producing each film in the present invention is not particularly limited, but as a physical thin film forming method, an electron beam heating vapor deposition method, various ion plating methods,
An arc vapor deposition method, a sputtering method or the like can be used.
In particular, the sputtering method is currently excellent as a method for forming a thin film on a large area substrate. Further, as a chemical thin film forming method, an atmospheric pressure CVD method, a low pressure CVD method, a plasma CVD method,
An optical CVD method or the like can also be used.

[0017]

In the heat ray-reflecting glass of the present invention as shown in FIG. 1, the roles of the respective layers cannot be clearly distinguished because the three-layer films influence each other due to the interference effect of light. Have a different role. First of 2
The layer limits the transmission of sunlight and allows the nitride to have a reflection shade on the glass side from yellow-green to yellow due to the interference effect of the oxide layer. The film thickness of each layer needs to be adjusted according to the selected material.

When a blue heat ray absorbing glass is used as the glass substrate, the transmittance of sunlight is lowered to make the transmitted color close to blue, and the blue color is a reflection color from yellow green to yellow on the film side. And is combined with the green color on the glass side. In addition, this function is not limited to green color,
Other color systems are possible, and by combining the color of the heat ray absorbing glass and the reflection color of the film, the reflection color on the glass side can be brought close to the desired color.

[0019]

【Example】

Example 1 A float glass plate (blue (color code: B) heat ray absorbing glass plate) was set in a vacuum chamber and evacuated to 1 × 10 ⁻⁵ Torr. Next, a mixed gas of Ar and N ₂ (2: 1) was introduced, the pressure was set at 3.1 × 10 ⁻³ Torr, and a titanium target was subjected to DC magnetron sputtering to deposit a TiN film of about 140 Å on a glass substrate at room temperature. Was formed as the first layer. Next, oxygen gas was introduced to obtain 3.2 × 10 ⁻³ Torr.
The titanium target was subjected to DC magnetron sputtering under the pressure of 1 to form a TiO ₂ film of about 550 Å as the second layer. Then, a TiN film of about 140 Å was formed as a third layer in the same manner as the first layer. The optical characteristics of the heat ray reflective glass sample thus obtained were measured and the results are shown in Table 1.

[0020]

[Table 1]

Example 2 A float glass plate (blue (color code: B) heat ray absorbing glass plate) was set in a vacuum chamber and evacuated to 1 × 10 ^-5 Torr. Next, a mixed gas of Ar and N ₂ (2: 1) was introduced, the pressure was set at 3.1 × 10 ⁻³ Torr, and a titanium target was subjected to DC magnetron sputtering to deposit a TiN film of about 140 Å on a glass substrate at room temperature. Was formed as the first layer. Next, oxygen gas was introduced to obtain 3.2 × 10 ⁻³ Torr.
The titanium target was subjected to DC magnetron sputtering under the pressure of 1 to form a TiO ₂ film of about 530 Å as the second layer. Then, a TiN film of about 140 Å was formed as a third layer in the same manner as the first layer. The optical characteristics of the heat ray reflective glass sample thus obtained were measured and the results are shown in Table 2.

[0022]

[Table 2]

Example 3 A float glass plate (blue (color code: B) heat ray absorbing glass plate) was set in a vacuum chamber and evacuated to 1 × 10 ^-5 Torr. Next, a mixed gas of Ar and N ₂ (2: 1) was introduced, the pressure was set to 3.1 × 10 ⁻³ Torr, and a titanium target was subjected to DC magnetron sputtering to form a TiN film of about 160 Å on a glass substrate at room temperature. Was formed as the first layer. Next, oxygen gas was introduced to obtain 3.2 × 10 ⁻³ Torr.
The titanium target was subjected to DC magnetron sputtering under the pressure of 1 to form a TiO ₂ film of about 600 Å as the second layer. Then, a TiN film of about 160 Å was formed as a third layer in the same manner as the first layer. The optical characteristics of the heat ray reflective glass sample thus obtained were measured and the results are shown in Table 3.

[0024]

[Table 3]

Example 4 A float glass plate (blue (color code: B) heat ray absorbing glass plate) was set in a vacuum chamber and evacuated to 1 × 10 ^-5 Torr. Next, 100% N ₂ gas was introduced and the pressure was increased to 3.
DC magnetron sputtering of a titanium target was performed at 1 × 10 ⁻³ Torr, and about 45 was deposited on a glass substrate at room temperature.
A Å TiN _x film was formed as the first layer. Next, oxygen gas was introduced, and a titanium target was DC magnetron sputtered at a pressure of 3.2 × 10 ⁻³ Torr to obtain about 440 Å
A TiO ₂ film was formed as the second layer. Then, a TiN _x film of about 140 Å was formed as a third layer in the same manner as the first layer. The optical characteristics of the heat ray reflective glass sample thus obtained were measured and the results are shown in Table 4.

[0026]

[Table 4]

Comparative Example 1 A glass plate made of a float glass plate was set in a vacuum chamber and evacuated to 1 × 10 ^-5 Torr. Next, oxygen gas was introduced, and a tin target was subjected to DC magnetron sputtering at a pressure of 3 × 10 ⁻³ Torr to form a SnO ₂ film of about 2700 Å as a first layer on a glass substrate at room temperature. Next, Ar gas is introduced, and a chromium target is subjected to DC magnetron sputtering at a pressure of 3 × 10 ⁻³ Torr to obtain about 170
A Cr film of Å was formed as the second layer. Then, a SnO ₂ film of about 130 Å was formed as a third layer in the same manner as the first layer. The optical characteristics of the heat ray reflective glass sample thus obtained were measured and shown in Table 5.

[0028]

[Table 5]

[0029]

EFFECTS OF THE INVENTION The heat-reflecting glass of the present invention is a heat-reflecting glass having a green-based outdoor-side reflection color and having a neutral reflection color on the indoor side, that is, on the film forming surface side, while having a total film thickness of 1000Å. Less than a thin film,
It has high productivity.

If the present invention is applied to a building window glass or the like,
Since the exterior has a vivid green color that has never been seen and the interior color tone is neutral, it is possible to obtain heat-reflecting glass with high designability and comfort. Further, according to the principle of the present invention, it is possible to easily obtain a heat ray reflective glass having a color tone that is difficult to obtain only with a film.

[Brief description of drawings]

FIG. 1 is a sectional view of a heat ray reflective glass according to the present invention.

[Explanation of symbols]

 10: Glass substrate 11, 13: Nitride film 12: Oxide film

Claims (5)

[Claims] 1. A nitride as a first layer and a second layer on a glass substrate.
A heat ray-reflecting glass characterized in that an oxide is sequentially formed as a layer and a nitride is sequentially formed as a third layer, and has a transmittance of 40% or less in a visible spectrum band. 2. The material of the oxide film is Ti, Sn, In,
The heat ray reflective glass according to claim 1, wherein the heat ray reflective glass is at least one selected from the group consisting of oxides of Zn, Zr, Ta, Hf, and Cr and complex oxides containing these as main components. 3. The material of the nitride layer is Ti, Cr, Zr,
The heat ray reflective glass according to claim 1 or 2, wherein the heat ray reflective glass is at least one selected from the group consisting of nitrides of Ta and Hf and composite nitrides containing these as the main components. 4. The nitride of the first layer has a thickness of 20 to 180.
Å The thickness of the oxide of the second layer is 370 to 600 Å, and the thickness of the nitride of the third layer is 90 to 200 Å. Glass. 5. The heat ray reflective glass according to any one of claims 1 to 4, wherein the glass substrate is a blue heat ray absorbing glass and exhibits a green color on the glass side.