JP2003104758A - Heat ray shielding glass and double grazing using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain reflection color except for purple base e.g. a* is <=1 from a heat ray shielding glazing based on a substrate/a 1st dielectric film/a metal film/a 2nd dielectric film. SOLUTION: The thickness of each film is as follows: the 1st dielectric film is 17.5-27.5 nm, the metal film (the main ingredient of which is Ag) is 5.5-7 nm, the 2nd dielectric film is 60-70 nm, the total of both dielectric films is 82.5-92.5 nm. Or, the 1st and 2nd dielectric films are 37.5-47.5 nm, the metal film is 5.5-6.5 nm, total of both dielectric films is 77.5-92.5, the 2nd dielectric film/the 1st dielectric film is 0.85-1015. Each of the dielectric film contains an oxide, or nitride or oxynitride, e.g. zinc oxide and/or silicon nitride as a main ingredient having an index of refraction of 1.9-2.2 in the region of 400-700 nm wavelength. From the heat shielding glass green reflection color of e.g. -16<=a*<=-4, -2<=b*<=4 is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat ray shielding glass and a multi-layer glass using the same. The invention is particularly
The present invention relates to a heat ray shielding glass having only one metal film that reflects heat rays.

[0002]

2. Description of the Related Art A technique for forming a multilayer film in which a silver film is sandwiched between dielectric films to provide a window glass with a heat ray shielding function has been known for a long time. In this multilayer film, the silver film acts as a heat ray reflection film, and the dielectric film acts as an antireflection film that suppresses a decrease in visible light transmittance. For example, Japanese Examined Japanese Patent Publication 47-631
Japanese Patent Publication No. 5 discloses a heat-shielding glass in which a so-called three-layer constitution film composed of a 12-35 nm silver film and 7-55 nm dielectric films provided on both surfaces thereof is formed on a glass plate. .

A multi-layer film including two silver films, for example, a so-called five-layer structure film in which two silver films and three dielectric films are alternately laminated is also known. For example, in Japanese Patent Laid-Open No. 63-134232, it was pointed out that the conventional three-layer constitution film "reflective color tone is limited to violet", and if a plurality of silver films are used, the visible light transmittance is increased. It is disclosed that the reflection color tone can be freely selected while maintaining at 70% or more. The example of this publication discloses a heat ray shielding glass having a reflection color such as green or blue green. Further, for example, Japanese Patent Laid-Open No. 63-239044 discloses that in a three-layer constitution film, in order to sufficiently increase the visible light transmittance and at the same time suppress the visible light reflectance to about glass, the silver layer has a thickness of 120Å (12 nm). ) Degree is allowed, and the surface resistance at this time is about 8Ω / □ ”, and when multiple silver films are used, the visible light transmittance is 70% or more and the surface resistance value is 6Ω. It is disclosed that the following can be achieved at the same time. Here, the surface resistance value is used as a substitute characteristic of the heat ray shielding function.

Compared with the heat ray-shielding film having a three-layer structure, the heat ray-shielding film having a five-layer structure can make the rising edge of the spectral reflectance curve sharper at the end of the visible region, particularly from the visible region to the near infrared region. . Therefore, it is easy to maintain a high visible light transmittance even if the total thickness of the silver film is large in order to obtain a desired heat ray shielding function.

[0005]

In practice, however, the biggest reason why the three-layer heat ray-shielding film is rarely considered despite the manufacturing advantage is rather the restriction in the reflection color tone. As is clear from FIG. 6 showing the general tendency of the spectral reflectance curve, the heat ray shielding film having a three-layer structure has a high visible light transmittance (low visible light reflectance) while maintaining a desired heat ray shielding function. However, the reflection at both ends of the visible region cannot be sufficiently suppressed. The reflection at the end of the visible region brings about the inevitable "purple color" of the reflected color pointed out in JP-A-63-134232. The reddish reflection color typified by purple is generally avoided as it impairs the appearance of windows.

The preference for reflected color tones, especially the need for green-based reflected colors, is becoming more and more prominent. On the other hand, areas where heat ray shielding glass is used and parts of windows (in buildings) are expanding, and there are signs that the heat shielding characteristics required for heat ray shielding glass are diversified.

In view of such circumstances, an object of the present invention is to provide a heat ray-shielding glass which has a film structure based on a so-called three-layer structure but can exhibit a reflection color other than purple.

[0008]

As a result of earnest studies, the present inventor has found that even a so-called three-layer heat ray shielding film has a reflection color other than violet, and further a reflection color of green which is currently in high demand. It was found that there is a predetermined film structure that can realize

The heat-shielding glass of the present invention comprises a transparent substrate and a multilayer film formed on the transparent substrate, the multilayer film having only one metal film containing silver as a main component, and It has a basic structure including a first dielectric film interposed between a transparent substrate and the metal film, and a second dielectric film arranged on the opposite side of the metal film from the transparent substrate.

According to the first aspect of the present invention, the first dielectric film and the second dielectric film each have a thickness of 400 nm to 700 nm.
An oxide having a refractive index of 1.9 or more and 2.2 or less in the wavelength range of nm,
It is a nitride or an oxynitride, and the thickness of the first dielectric film is 17.5.
nm or more and 27.5 nm or less, the thickness of the second dielectric film is 60 nm or more and 70 nm or less, and the total value of the thickness of the first dielectric film and the thickness of the second dielectric film is 82.5 nm or more and 92.5 A heat ray-shielding glass having a thickness of not more than nm and a metal film thickness of not less than 5.5 nm and not more than 7 nm is provided.

According to the second aspect of the present invention, the first aspect
The dielectric film and the second dielectric film are each 400 nm to 700 nm
Is an oxide, nitride or oxynitride having a refractive index of 1.9 or more and 2.2 or less in the wavelength region of, and each film thickness is 37.5 nm or more
47.5 nm or less, the total film thickness is 77.5 nm or more and 92.5 nm or less, and the ratio of the thickness of the second dielectric film to the thickness of the first dielectric film is 0.85 or more and 1.15 or less. Provided is a heat ray-shielding glass having a film thickness of 5.5 nm or more and 6.5 nm or less.

In this specification, in order to digitize colors, JIS
The color system based on Z8726-1990 is adopted. In this color system, the color shifts from green to red as the value of a ^* changes from negative to positive. As the value of b ^* changes from negative to positive, the color shifts from bluish to yellowish. According to the present invention, it is possible to provide a heat ray-shielding glass which has a non-purple reflection color, but has a reflection color which is not reddish, that is, a reflection color in which a ^* is 1 or less, preferably negative. According to the present invention, on at least one surface, a greenish reflection color,
Specifically, it is possible to obtain a reflection color in which a ^* is negative and the absolute value of a ^* is larger than the absolute value of b ^* .

Furthermore, according to the third aspect of the present invention, the thickness of the metal film is 5.5 nm or more and 8 nm or less, and the reflection color for light incident from at least one surface is a ^{* of} 1 or less,
A heat-shielding glass preferably having a negative a ^* is provided. Also in this case, the absolute value of a ^* is preferably larger than the absolute value of b ^* , and the material of the dielectric film is preferably an oxide, a nitride, or an oxynitride having a refractive index in the above range.

The present invention includes a double glazing containing the above heat ray shielding glass. The heat ray-shielding glass using a metal film containing silver as a main component is often used as a multi-layer glass mainly because of its durability. The double glazing of the present invention can easily adjust its solar heat gain coefficient within a range of, for example, 0.66 to 0.76. This range is considerably higher than in the case of using a heat ray shielding film having a so-called five-layer structure in a mode of a typical double glazing produced in the section of Examples, and in a region lower than in the case where the heat ray shielding glass is not used. Belong to Realization of the solar heat gain rate in this range is useful for meeting the diversifying demand for window glass.

At least one of the first dielectric film and the second dielectric film preferably contains at least one selected from zinc oxide and silicon nitride as a main component. Although the heat ray-shielding glass of the present invention is basically advantageous in terms of production efficiency over the heat ray-shielding glass which adopts a so-called five-layer structure,
If zinc oxide is used, the advantage in production becomes more remarkable due to its high film forming rate. Similar to zinc oxide, silicon nitride is a dielectric material having a refractive index within the above range in the wavelength range of 400 nm to 700 nm, and is a preferable material capable of complementing zinc oxide in durability.

The wavelength range of 400 nm to 700 nm is a region of visible light having high visibility and is the most important region for determining the color tone. In addition, in the present specification, the "main component" refers to a component accounting for 50% by weight or more.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be described below. In a glass plate having a multilayer film formed on one main surface, a slightly different reflection color is often observed on this main surface (film surface) and the other main surface (glass surface). Usually, since the reflection color from the outdoor side is important, it may be sufficient to adjust the reflection color on either one of the surfaces. However, according to the present invention, it is also possible to set the reflection colors on both surfaces to be greenish in which both a ^* are negative and the absolute value of a ^* is larger than the absolute value of b ^* . Furthermore, the reflection color on at least one surface is green, which is aesthetically favored and in great demand, specifically, -16.0≤a ^* ≤-4.
0, -2.0 ≤ b ^* ≤ 4.0, especially -10.0 ≤ a ^* ≤ -5.0,-
The range may be 1.0 ≦ b ^* ≦ 2.0. in this way,
By applying the present invention, it is possible to provide a heat ray-shielding glass having a non-violet reflection color, for example, a green reflection color, without using a plurality of metal films that reflect heat rays.

Due to the general tendency of the spectral reflectance curve schematically shown in FIG. 6, it has been conventionally considered that the reflection color is limited to violet in a so-called three-layer film. However, typically, as shown by the spectral reflectance curve shown in FIG. 1, the reflectance from the red region to the near-infrared region is slightly lowered. Even with a layered film, the color tone can be changed by flattening the reflectance curve in the visible range. To flatten the reflectance curve,
It is preferable to limit the film thickness of the metal film to, for example, 8 nm or less, preferably 7 nm or less. However, if the thickness is made thinner than 5.5 nm, the continuity of the metal film may be lost.
The material of the dielectric film, the film thickness, etc. also influence the shape of the spectral reflectance curve. As shown in the examples below,
If these are appropriately selected, it is possible to obtain a reflection color that is preferred as the appearance of the window glass.

A decrease in reflectance from the red region to the near infrared region causes a decrease in solar reflectance, that is, a decrease in heat ray shielding function. However, it is possible to put the deterioration of this function within an allowable range. Rather, it may even be desirable to reduce the solar reflectance (increased solar transmittance) within the allowable range. This is based on the fact that in reality not all windows require low solar transmittance. For example, in a north-facing window, the low radiation properties are useful for insulating the openings, but the solar radiation per se need not be considered. Even in windows facing other directions, too low solar radiation transmittance rather detracts from the so-called "soft feeling" that can be felt by the window in winter. Insolation is very common in other structures around windows (eg blinds,
It can also be shielded by curtains and eaves. These members have the advantage that they can be opened and closed, and even if they are not, the shielding function is automatically adjusted by the variation of the sun's altitude depending on the season, for example, in the case of eaves. Reduces the need for shielding.

Although the conventional heat-shielding glass attaches too much importance to the shielding of the solar radiation in the summer, the combination of the eaves and the heat-shielding glass of the present invention makes the eaves part of the shielding of the solar radiation in the summer. This can be the basis for a new opening that also allows you to experience solar heat in the winter. As described above, according to the present invention, the multi-layer glass of the present invention and a solar shading member (for example, an eaves) arranged so as to shield at least a part of solar radiation on the multi-layer glass at least at noon of the summer solstice. ), And a window structure including and, and a building including the window structure can be provided.

Along with the spread thereof, the window in which the heat ray shielding glass is adopted has been diversified. For this reason, there is an increasing need for a heat ray-shielding glass that has the same reflection color tone and has the solar radiation-shielding property according to the part. From this point of view, the existence value of the heat ray-shielding glass that can provide a reflection color that is in harmony with the reflection color when using a plurality of silver films while using a single-layer silver film is extremely high.

In a preferred embodiment of the present invention, neutralization (colorlessness) of transmitted light can be realized. The transmitted color is specifically -3.0 ≤ a ^* ≤ 1.0, -2.0 ≤ b ^* ≤ 4.0, especially -1.5 ≤ a ^*
The range of ≦ 0 and −1.0 ≦ b ^* ≦ 2.0 is preferable. This excellent property provides a natural view through the window glass.

The heat-shielding glass of the present invention comprises a glass plate 10, a first dielectric film 1, a silver film 2, an additional dielectric film 3 and a second dielectric film 4, as shown in FIG. And a multi-layered film that is included in this order from the glass plate side. Thus, although the so-called three-layer structure film is used, the number of layers contained in the heat ray-shielding glass of the present invention is not limited to three.

There are no particular restrictions on the components, thickness, etc. of the glass plate 10. As the glass plate, tempered glass or laminated glass may be used.

The first dielectric film 1 and the second dielectric film 4 are 40
In the wavelength range of 0 nm to 700 nm, the refractive index is 1.9 to 2.2, and it is preferable that at least one selected from tin oxide, tantalum oxide, bismuth oxide, zinc oxide, silicon nitride and silicon oxynitride is the main component. . When using a plurality of these dielectrics, the total amount may be the main component. Particularly preferred dielectrics are zinc oxide and silicon nitride. In this case, the dielectric film may be a single layer film of zinc oxide or silicon nitride, and is a film including a plurality of single layer films such as a multilayer film in which zinc oxide films and silicon nitride films are alternately laminated. May be. A film in which zinc oxide and silicon nitride are mixed may be used.

Both the zinc oxide film and the silicon nitride film can be formed by the DC sputtering method. Although the production method of the heat ray-shielding glass of the present invention is not limited to the direct current sputtering method, this method is at least at the present time.
It is most advantageous as an industrial film forming method applicable to a substrate having a large area required for a window glass.

Zinc oxide (ZnO) has a high film forming rate and is advantageous for mass production, but it tends to have a columnar crystal structure in which moisture, corrosive gas, and the like easily pass. On the other hand, silicon nitride (SiNx) is inferior to zinc oxide in film forming rate, but tends to have an amorphous structure. Therefore, if the zinc oxide film and the silicon nitride film are alternately laminated, it is easy to achieve both the film formation speed and the durability of the silver film. Zinc oxide and silicon nitride are 500 nm
Since the refractive indices (both are about 2.0) are similar in the wavelength range of ~ 600 nm, it is difficult for extra reflection and refraction at the interface to occur even if they are laminated alternately.

Therefore, the preferred form of the dielectric film is Zn.
It includes a multilayer film composed of three layers, five layers or more, which can be represented as O / SiNx / ZnO, ZnO / SiNx / ZnO / SiNx / ZnO and the like. In these multilayer films, the zinc oxide film and the silicon nitride film may have respective film thicknesses of 15 to 35 nm and 6 to 20 nm, for example, in consideration of film formation speed and durability.

Such a laminated structure of the zinc oxide film and the silicon nitride film is particularly suitable for the second dielectric film located on the atmosphere side (the side opposite to the glass plate) of the silver film. On the other hand, the first dielectric film may be formed of a zinc oxide film having a high film formation speed, with the majority of the film thickness, and further, the entire film thickness.

In addition to or instead of the laminated structure of the zinc oxide film and the silicon nitride film, another means for improving the durability of the silver film may be adopted. This means includes the addition of minor components to the silver film, for example metals such as Pd, Pt, Rh, Au.

As described above, the silver film 2 only needs to contain silver as a main component and is called a "silver film" for the sake of convenience, but this does not mean that other trace components are not excluded. This point is the same for the "zinc oxide film" and the "silicon nitride film" described above.

The additional dielectric film 3 is formed by oxidizing an additional metal film (barrier film). The barrier film is basically a layer required with the adoption of the reactive sputtering method, and prevents deterioration due to oxidation of the silver film when the second dielectric film 4 is formed by the reactive sputtering method. Is formed to When the dielectric film 3 formed by oxidizing or nitriding the barrier layer is made of the same material as the dielectric immediately above, it is not observed as an independent layer but as a part of the second dielectric film 4. There is. For example, if a zinc oxide film is formed immediately above the zinc barrier layer using a zinc target in an oxygen-containing atmosphere, the zinc oxide film, which is apparently observed as one layer, remains on the silver film.

As the barrier film, for example, Nb, Ni, Cr, T
A metal film such as i or Zn can be used. The additional dielectric film generated from this barrier film is a dielectric containing the above-exemplified metal, for example, a metal oxide, a metal nitride, or a metal oxynitride. The barrier layer which is sacrificed by itself and is oxidized has an appropriate film thickness range according to the reactive sputtering method to be applied. This film thickness range is usually 1.5 to 5 nm, preferably 2 to 4 nm, as expressed by the film thickness after being oxidized.

Films other than those shown are not excluded from the heat-shielding glass of the present invention. As long as the above-mentioned object of the present invention is achieved, for example, an additional metal film may be disposed between the silver film and the dielectric film in order to improve adhesion and the like. Further, a protective film may be formed.

The laminated glass of the present invention includes a heat ray shielding glass 21 and another glass plate 22, as shown in FIG. 3, for example. In this double glazing, the air layer 23 secured by the spacer 24 interposed in the peripheral edge of the glass is hermetically sealed by the sealing material 25 also interposed in the peripheral edge. Although illustration is omitted, a desiccant or the like is often arranged in the spacer. As a method for producing the double glazing, it is sufficient to apply a conventionally known method.

In FIG. 3, the heat ray shielding glass is arranged as the indoor side (indoor side) glass plate, but the reverse arrangement may be adopted. In general, the former arrangement has a slightly higher solar heat gain rate than the latter arrangement. Therefore, when a slightly higher solar heat gain rate (for example, 0.7 or more) is desired, the illustrated arrangement is suitable. The arrangement of the double glazings may be selected so that the reflection color adjusted to a more preferable range is observed from the outdoor side (outdoor side). Since the film surface is usually arranged on the air layer side, the reflection color of the film surface is observed from the outdoor side in the illustrated arrangement. The structure of the multi-layer glass, for example, the sealing structure of the peripheral portion is not limited to the illustrated form. For example, when decompressing the air layer in order to improve the heat insulating property, a member or the like used for exhausting and subsequent sealing is arranged at the peripheral portion. In this case, a spacer for maintaining a space is usually arranged also in the air layer (decompression layer).

[0037]

[Example] Using an in-line type DC sputtering device, a soda lime glass plate having a thickness of 3 mm was coated with a zinc oxide film, a silver film, a titanium oxide film, and a zinc oxide film in this order from the side of the glass plate. A film was formed. The film thickness of each film is shown in Table 1. The zinc oxide film is under a reduced pressure atmosphere of 0.4 Pa in which argon and oxygen are introduced at a flow ratio of 1: 9, and the silicon nitride film is under a reduced pressure atmosphere of 0.4 Pa in which argon and nitrogen are introduced at a flow ratio of 1: 9. The other films were respectively formed under an argon atmosphere whose pressure was reduced to 0.4 Pa. The zinc oxide film, the silicon nitride film, the silver film, and the titanium oxide film were formed by using zinc, silicon, silver, and titanium as targets, respectively. The titanium oxide film was formed as a titanium film, and this film was formed by being oxidized in the subsequent zinc oxide film forming process. As the film forming conditions (applied voltage, film forming time, etc.), the conditions which were confirmed in advance so that the film thickness of each film was the value in the table were applied. In all samples, the titanium film was formed to have a thickness of 2 nm.

Regarding each heat ray shielding glass thus obtained,
The visible light transmittance, the solar radiation transmittance, the transmitted color, and the visible light reflectance, the solar reflectance, and the reflected color of the light incident from the film surface and the glass surface were measured. Visible light transmittance, visible light reflectance, solar radiation transmittance and solar radiation reflectance were measured according to JIS R3106-1998, and transmitted color and reflected color were measured according to JIS Z8726-1990. A U3410 type self-recording spectrophotometer manufactured by Hitachi Ltd. was used for measuring the transmittance and the reflectance. The reflection characteristics were measured with specularly reflected light with an incident angle of 12 °, and the transmission characteristics were measured with an incident angle of 0 °. The calculation of transmission color and the reflection color, the D ₆₅ is employed as a light source, a viewing angle was 2 °. Further, the reflection color of each of the surface (film surface) on which the heat ray shielding film was formed and the surface (glass surface) on which the heat ray shielding film was not formed was visually observed. The results are summarized in Table 2.

In the same manner as described above, a heat ray shielding film having the film constitution shown in Table 3 was formed on a soda lime glass plate having a thickness of 3 mm. In this heat ray shielding film, a zinc oxide film and a silicon nitride film were alternately laminated as the second dielectric film.
A multilayer film having a layer structure is used. The characteristics of each heat ray-shielding glass thus obtained were measured in the same manner as above. The results are summarized in Table 4. Further, using each heat ray-shielding glass and the above-mentioned glass plate on which the heat ray-shielding film is not formed, a double-layer glass having the same configuration as that of FIG. 3 was produced. The thickness of the air layer was 12 mm. The solar heat gain rate was measured for these double glazings. The solar heat gain rate was measured by arranging the heat-shielding glass on the indoor side, that is, on the non-sunlight incident side. The measurement of the solar heat gain rate was performed based on JIS R3106-1998.

[0040]

[Table 1]

[0041]

[Table 2]

[0042]

[Table 3]

[0043]

[Table 4]

From each of the samples except Samples 22 to 23, a non-reddish reflection color having a ^* of 1 or less was obtained on both surfaces. In Samples 1 to 11, a ^* was negative in both reflection colors on both sides (the film surface side and the glass surface side), and a greenish color in which the absolute value of a ^* was larger than the absolute value of b ^* . Moreover, in these samples, the absolute values of the transmitted colors a ^* and b ^* were 1 or less, and the transmitted light was hardly colored. The visible light transmittance of all the samples was 70% or more.

In the film structure shown in Table 1, the film thickness of the silver film is all 8 nm or less, and 7 nm except for sample 15.
It is below. When the silver film is thinned in this way,
As shown schematically in FIG. 1, the reflectance curve in the visible region is flattened, so that the reflected color can be easily adjusted to a color other than purple. However, as can be seen from the existence of Samples 22 to 23, there are cases where a preferable reflection color cannot be obtained even if the silver film is thinned.

As shown in FIG. 4, the reflectance curves for the film surfaces of Sample 4 and Sample 19 have peaks in the visible range. On the other hand, the reflectance curve for the film surface of Sample 23 has a peak from the end of the visible region to the ultraviolet region, as shown in FIG. Corresponding to the position of this peak, a green reflection color from the film surface of sample 4, a bluish reflection color from the film surface of sample 19, and a purple reflection color from the film surface of sample 23 Are obtained respectively. From FIGS. 4 and 5, it can be confirmed that a slight change in the shape of the spectral reflectance curve in the visible region affects the reflected color.

The shape of the spectral reflectance curve is affected not only by the material and film thickness of each film, but also by their relative relationship. The first and second aspects of the present invention are determined in consideration of these factors, and are within the range in which the object of the invention can be achieved, and are optimal for providing the currently preferred reflection color. It is also a materialized version. However, it is generally difficult to present all the combinations that give a particular reflected color. This point can be seen from Samples 13 to 21 that do not satisfy the film thickness conditions specified for the first and second side surfaces.
This can also be confirmed from the fact that non-purple reflection colors including green were obtained. The sample in which the thickness of the silver film is limited to 8 nm or less and the interference condition of each film is appropriately controlled is within the range described as the third aspect of the present invention.

[0048]

According to the present invention, the substrate / first dielectric film /
It is possible to provide a heat ray-shielding glass having a reflection color other than violet, while using a so-called three-layer structure film based on a metal film (heat ray reflection film) / second dielectric film. In the past, mainly because of the ease of designing the reflection color, a five-layer structure film using two metal layers has been the target of product development. In order to provide various reflection colors even in a three-layer structure film that is advantageous for mass production, or to provide a window glass that has an appropriate heat ray shielding function according to the site while responding to aesthetic demands, The utility value of the invention is extremely high.

[Brief description of drawings]

FIG. 1 is a diagram schematically showing a difference in spectral reflectance curves obtained from a conventional so-called three-layer heat ray shielding glass and the heat ray shielding glass of the present invention.

FIG. 2 is a cross-sectional view showing one form of the heat ray-shielding glass of the present invention.

FIG. 3 is a cross-sectional view showing an embodiment of double glazing of the present invention.

FIG. 4 is a diagram showing an example of a spectral reflectance curve (film surface) of the heat-shielding glass of the present invention.

FIG. 5 is a diagram showing an example of a spectral reflectance curve (film surface) of a heat ray-shielding glass exhibiting a purple reflection color.

FIG. 6 is a diagram schematically showing a difference in spectral reflectance curves obtained from a conventional so-called three-layer heat ray shielding glass and a so-called five-layer heat ray shielding glass.

[Explanation of symbols]

1st dielectric film 2 silver film 3 Additional dielectric film 4 Second dielectric film 10 glass plates 21 Heat ray shielding glass 22 glass plate 23 Air layer 24 spacer 25 Seal material

Continued front page    F-term (reference) 4F100 AA12B AA12D AA17B AA17D                       AA21 AA25B AA25D AB24C                       AD04B AD04D AT00A BA04                       BA05 BA07 BA10A BA10D                       EH66 GB07 JA20C JD01                       JD10 JG05B JG05D JG05E                       JM02B JM02C JM02D JM02E                       JN01A JN06 JN08 JN18B                       JN18D JN30 YY00C                 4G059 AA01 AB09 AC06 DA01 DB02                       EA01 EA12 EB04 GA02 GA04                       GA14                 4G061 AA21 BA01 CD02 CD21

Claims (14)

[Claims] 1. A transparent substrate and a multilayer film formed on the transparent substrate, wherein the multilayer film has only one metal film containing silver as a main component, and the transparent substrate and the metal film. A first dielectric film interposed between the first dielectric film and the second dielectric film disposed on the opposite side of the metal film from the transparent substrate,
The first dielectric film and the second dielectric film are respectively
An oxide, a nitride, or an oxynitride having a refractive index of 1.9 or more and 2.2 or less in a wavelength range of 400 nm to 700 nm, the thickness of the first dielectric film is 17.5 nm or more and 27.5 nm or less, and the second dielectric The film thickness of the body film is 60 nm or more and 70 nm or less, and the total value of the film thickness of the first dielectric film and the film thickness of the second dielectric film is 82.5 nm.
92.5nm or more, the thickness of the metal film is 5.5nm or more 7
A heat ray shielding glass characterized by having a thickness of nm or less. 2. A transparent substrate and a multilayer film formed on the transparent substrate, wherein the multilayer film has only one metal film containing silver as a main component, and the transparent substrate and the metal film. A first dielectric film interposed between the first dielectric film and the second dielectric film disposed on the opposite side of the metal film from the transparent substrate,
The first dielectric film and the second dielectric film are respectively
In the wavelength range of 400 nm to 700 nm, the refractive index is 1.9 or more and 2.2 or less oxide, nitride or oxynitride, and the total film thickness is 37.5 nm or more and 47.5 nm or less and the total value of the film thickness is 77.5.
nm to 92.5 nm, the ratio of the thickness of the second dielectric film to the thickness of the first dielectric film is 0.85 to 1.15, and the thickness of the metal film is 5.5 nm to 6.5 nm. Heat-shielding glass characterized by being. 3. The heat ray-shielding glass according to claim 1, wherein the reflection color for light incident from at least one surface has an a ^* of 1 or less when displayed by a color system in accordance with JIS Z8726. 4. A transparent substrate and a multilayer film formed on the transparent substrate, wherein the multilayer film has only one metal film containing silver as a main component, and the transparent substrate and the metal film. A first dielectric film interposed between the first dielectric film and the second dielectric film disposed on the opposite side of the metal film from the transparent substrate,
The thickness of the metal film is 5.5 nm or more and 8 nm or less, the reflection color for light incident from at least one surface, JIS Z8
A heat ray-shielding glass characterized by having an a ^* of 1 or less when displayed by a color system conforming to 726. 5. The first dielectric film and the second dielectric film each have a refractive index of 1.9 or more in the wavelength range of 400 nm to 700 nm.
An oxide, nitride or oxynitride of 2.2 or less.
The heat ray-shielding glass according to. 6. The reflected color of light incident from at least one surface is displayed by a color system conforming to JIS Z8726, and a ^* is negative and the absolute value of a ^* is greater than the absolute value of b ^*. The heat ray-shielding glass according to any one of claims 3 to 5, which is also large. 7. The heat ray-shielding glass according to claim 1, wherein the reflected color of light incident from at least one surface is in the following range, which is represented by a color system conforming to JIS Z8726. . -16.0 ≤ a ^* ≤ -4.0, -2.0 ≤ b ^* ≤ 4.0 8. The heat ray-shielding glass according to claim 1, wherein the transmitted color is represented by a color system based on JIS Z8726 and is in the following range. −3.0 ≦ a ^* ≦ 1.0, −2.0 ≦ b ^* ≦ 4.0 9. The heat wire according to claim 1, wherein at least one selected from the first dielectric film and the second dielectric film contains at least one selected from zinc oxide and silicon nitride as a main component. Shielding glass. 10. At least one selected from a first dielectric film and a second dielectric film is formed by alternately laminating a film containing zinc oxide as a main component and a film containing silicon nitride as a main component. 9. The heat ray shielding glass as described in 9. 11. The heat ray shielding glass according to claim 1, further comprising at least one selected from an additional metal film and an additional dielectric film, which are arranged so as to be in contact with the metal film. 12. An additional dielectric film disposed on the metal film, the additional dielectric film having a thickness of 1.5 nm or more.
The heat ray-shielding glass according to claim 11, having a thickness of nm or less. 13. A double glazing comprising the heat ray shielding glass according to claim 1. 14. The double glazing according to claim 13, wherein the heat ray shielding glass is used as the indoor side glass, and the multilayer film faces the air layer.