KR20220159712A - Light concentrating fitting - Google Patents

Abstract

A light concentrating window according to one embodiment of the present invention includes a window wherein the window includes: a sunlight concentrating unit including a quantum dot layer, a first low refractive index layer laminated on one or both surfaces of the quantum dot layer and having a refractive index lower than that of the quantum dot layer, a first surface through which sunlight enters, and a second surface facing the first surface; a first low iron light transmitting member laminated on the first surface of the sunlight concentrating unit; a second low iron light transmission member laminated on the second surface of the sunlight concentrating unit; and a dye layer for gray coloring laminated on a side opposite to the sunlight concentrating unit among both sides of the second low iron light transmitting member, and achieving gray coloring when overlapping with light emitted from the second surface of the sunlight concentrating unit. The purpose of the present invention is to provide a light concentrating window which can achieve a natural gray color while enhancing the efficiency of a light concentrator.

Description

Light concentrating fitting}

The present invention relates to a light-concentrating window and door, and more particularly, to a light-concentrating window and door capable of improving the efficiency of a light concentrator including a light transmitting member and a solar collector and realizing natural colors.

In recent years, photovoltaic power generation facilities capable of generating electric power using solar energy are becoming increasingly common. BIPV (Building Integrated PhotoVoltaic), which uses these photovoltaic power generation facilities such as solar cells as the exterior finishing material of buildings, was used in the convention center of the Technical University of Lausanne in Switzerland in early 2014, and has recently been used in the 21st century It is attracting worldwide attention as a promising new technology.

However, a light concentrator for concentrating light on a light receiving surface of a solar cell used in such building-integrated photovoltaic power generation using ordinary glass has a problem in that the efficiency of the light concentrator is lowered.

In addition, since such a light concentrator is generally red, there is a problem in that the aesthetics of the light concentrating type window is deteriorated.

An object of the present invention is to provide a light-concentrating window capable of realizing a natural gray color while improving the efficiency of a light concentrator.

Another object of the present invention is to provide a light-concentrating window capable of preventing an excessive decrease in light intensity introduced into a room by using a dye layer for implementing a gray color for implementing a natural gray color.

Another object of the present invention is to provide a light-concentrating window capable of realizing a natural gray color even when a small amount of a dye layer for realizing gray color is used.

In order to achieve the above object, a light concentrating window or door according to a first feature of an embodiment of the present invention includes a window, and the window is laminated on a quantum dot layer and one or both sides of the quantum dot layer, and the refractive index of the quantum dot layer a solar concentrator including a first low refractive index layer having a lower refractive index and having a first surface on which sunlight is incident and a second surface facing the first surface; a first low iron light transmitting member laminated on the first surface of the solar light concentrating unit; a second low iron light transmission member laminated on the second surface of the solar light concentrating unit; and a dye for implementing gray that is stacked on the opposite side of the solar light collecting unit among both sides of the second low iron light transmitting member and realizes gray color when overlapped with light emitted from the second surface of the solar light collecting unit. Characterized in that it comprises a layer.

A light concentrating window or door according to a second aspect of an embodiment of the present invention includes a window, and the window is provided on a quantum dot member and at least one of a surface and an inside of the quantum dot member and has a refractive index lower than that of the quantum dot member. a solar light collecting unit including a refraction pattern and having a first surface on which sunlight is incident and a second surface facing the first surface; a first low iron light transmitting member laminated on the first surface of the solar light concentrating unit; a second low iron light transmission member laminated on the second surface of the solar light concentrating unit; and a dye for implementing gray that is stacked on the opposite side of the solar light collecting unit among both sides of the second low iron light transmitting member and realizes gray color when overlapped with light emitted from the second surface of the solar light collecting unit. Characterized in that it comprises a layer.

A light concentrating window or door according to a third aspect of an embodiment of the present invention includes a first window and a second window facing the first window, wherein the first window is laminated on a quantum dot layer and one or both sides of the quantum dot layer, a solar concentrating unit including a first low refractive index layer having a refractive index lower than that of the quantum dot layer and having a first surface on which sunlight is incident and a second surface facing the first surface; and a first low-iron light-transmitting member laminated on the first surface of the solar concentrator, wherein the second window is a low-iron light-transmitting member for coating facing the first window; and a dye layer for implementing a gray color when coated on the low iron light transmitting member for coating and overlapping with the light emitted from the second surface of the solar concentrator.

A light concentrating window or door according to a fourth feature of an embodiment of the present invention includes a first window and a second window facing the first window, wherein the first window is a quantum dot member, and at least one of a surface and an inside of the quantum dot member. a solar light concentrating unit provided on and including a low refractive index having a refractive index lower than that of the quantum dot member, and having a first surface on which sunlight is incident and a second surface facing the first surface; and a first low-iron light-transmitting member laminated on the first surface of the solar concentrator, wherein the second window is a low-iron light-transmitting member for coating facing the first window; and a dye layer for implementing a gray color when coated on the low iron light transmitting member for coating and overlapping with the light emitted from the second surface of the solar concentrator.

In the light collecting type window or door according to the first feature, the window is laminated between the second low iron light transmitting member and the gray dye layer, and includes a second low refractive index layer having a refractive index lower than that of the gray dye layer. can include more.

The light collecting window or door according to the second feature further includes a low refractive index layer having a refractive index lower than that of the gray dye layer, the window being laminated between the second low iron light transmitting member and the gray dye layer. can do.

In the light concentrating window or door according to the third feature, the second window is laminated between the low iron light transmission member for coating and the dye layer for gray implementation, and has a second low refractive index having a refractive index lower than that of the dye layer for gray implementation. It may contain more layers.

In the light collecting type window according to the fourth feature, the second window is laminated between the low iron light transmission member for coating and the dye layer for gray implementation, and the low refractive index layer having a refractive index lower than the refractive index of the dye layer for gray implementation is used. can include more.

The following effects are achieved by using the light-concentrating windows and doors according to the embodiment of the present invention.

1. Natural gray can be realized while improving the efficiency of the light concentrator.

2. By using a dye layer for realizing a gray color for realizing a natural gray color, it is possible to prevent the light intensity from being excessively lowered into the room.

3. A natural gray color can be realized even if a small amount of a dye layer for realizing gray is used.

Hereinafter, a preferred embodiment of the light collecting type window according to the present invention will be described in detail with reference to the accompanying drawings.
1 is a front view of a light-collecting window or door according to an embodiment of the present invention.
2 is a partial cross-sectional view of a light-collecting window or door according to an embodiment of the present invention.
3 is a graph showing transmittance with respect to the wavelength of light according to the light transmitting member.
4 is a graph showing light efficiency of a light concentrator according to a light transmitting member.
5 is a partial cross-sectional view of a light collecting type window or door according to a first modified example of an embodiment of the present invention.
6 is a partial cross-sectional view of a light collecting type window or door according to a second modified example of an embodiment of the present invention.
7 is a partial cross-sectional view of a light collecting type window or door according to a third modified example of an embodiment of the present invention.

Hereinafter, a preferred embodiment of the light collecting type window according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a front view of a light-concentrating window or door according to an embodiment of the present invention, and FIG. 2 is a partial cross-sectional view of the light-concentrating type window or door according to an embodiment of the present invention.

Referring to FIGS. 1 and 2 , a light collecting type window 100 according to an embodiment of the present invention will be described.

The light collecting type window 100 includes a window 110 . In addition, the light collecting window 100 may further include at least one of the window frame 120 and the solar cell 130 . In addition, the light collecting type window 100 may further include an external window frame (not shown).

The window 110 is a portion through which sunlight SL (see FIG. 2 ) is transmitted.

In this specification, the "window 110" may be a window provided to a "window that people do not enter and exit", but is not limited thereto, and for example, a window provided to a "door that people come and go" such as a veranda door It should be noted that it may contain windows.

The window 110 includes a solar light collecting unit 111 , a first low iron light transmitting member 114 , a second low iron light transmitting member 118 , and a dye layer 115 for implementing a gray color. In addition, the window 110 may further include a second low refractive index layer 117 . In addition, the window 110 may further include a third low iron light transmitting member 119 or a protective film (not shown).

The solar concentrator 111 includes a quantum dot layer 112 and a first low refractive index layer 113 . In addition, the sunlight collector 111 has a first surface S1 on which sunlight SL is incident, and a second surface S2 opposite to the first surface S1.

In the present specification, the "solar light concentrator 111" may also be referred to as a "luminescent solar concentrator" or a "luminescent solar concentrator", and a light emitting body absorbs sunlight SL to produce low-energy It may be a component that re-emits light (eg, visible light and/or infrared light) (PhotoLuminescence; PL). Also, in the present specification, the “light concentrator” may be a component including the solar light collecting unit 111 and the first low iron light transmitting member 114 .

The quantum dot layer 112 includes a plurality of quantum dots (QDs). Quantum dots (QDs) can convert light energy of a specific wavelength into light energy of another wavelength. For example, the sunlight SL incident to the sunlight concentrator 111 may be converted into visible light and/or infrared light having a predetermined wavelength by the quantum dots QD in the quantum dot layer 112 and emitted. . The light L emitted in this way is totally reflected from both sides of the quantum dot layer 112 due to the difference in refractive index between the quantum dot layer 112 and the first low refractive index layer 113, and is guided along the longitudinal direction of the quantum dot layer 112. After that, the sunlight may be radiated from the side of the concentrating unit 111 .

The first low refractive index layer 113 is laminated on one or both surfaces of the quantum dot layer 112 and has a refractive index lower than that of the quantum dot layer 112 .

The first low iron light transmitting member 114 is a low iron light transmitting member laminated on the first surface S1 of the solar light collecting unit 111 .

In the present specification, “low-iron light-transmitting member” may mean “a light-transmitting member in which the ratio of the total weight of FeO, Fe ₂ O ₃ , and Fe ₃ O ₄ to the total weight of the light-transmitting member is 0.01% or less”, and , "low iron glass" may mean "a glass in which the proportion of the total weight of FeO, Fe ₂ O ₃ , and Fe ₃ O ₄ in the total weight of the glass is 0.01% or less". Accordingly, "low iron light transmitting member" includes a non-ferrous light transmitting member that does not contain FeO, Fe ₂ O ₃ , and Fe ₃ O ₄ at all, and "low iron glass" includes FeO, Fe ₂ O ₃ , and non-ferrous glass containing no Fe ₃ O ₄ .

Also, in the present specification, the “low iron light transmitting member” may include at least one of low iron glass and quartz. For example, since the price of “low iron glass” is lower than that of “quartz”, when “low iron glass” is used as the “low iron light transmitting member”, the manufacturing cost of the light collecting window 100 can be reduced.

3 is a graph showing transmittance with respect to the wavelength of light according to the light transmitting member. Specifically, FIG. 3 shows the transmittance with respect to the wavelength of light in common soda lime glass, low iron glass, and quartz. As can be seen from FIG. 3 , low iron glass and quartz belonging to the low iron light transmitting member have high light transmittance for all wavelength ranges shown, compared to common soda lime glass containing a significant amount of iron.

4 is a graph showing light efficiency of a light concentrator according to a light transmitting member. Specifically, in FIG. 4 , in a light concentrator including first and second light transmitting members and a quantum dot layer interposed therebetween, the first and second light transmitting members are generally soda lime glass, low iron glass, and quartz. In the case of each implementation, light efficiency, which is the ratio of the intensity of light emitted from the quantum dot layer to the intensity of sunlight incident on the light concentrator, is shown.

The light concentrator was specifically manufactured as follows.

First, first and second light-transmitting members made of common soda-lime glass, first and second light-transmitting members made of low-iron glass, and first and second light-transmitting members made of quartz were prepared, respectively. The first and second light transmitting members each had a thickness of 1 mm and an area of 10 cm x 10 cm.

Next, a quantum dot resin was prepared. Specifically, a quantum dot resin was prepared by dispersing quantum dots in a polymer resin containing isobonyl acrylate, DiPentaerythritol HexaAcrylate (DPHA), and an initiator OXE-3. In this regard, quantum dots include a core made of CuInS and a shell made of ZnS. In addition, these quantum dots had a dominant wavelength of 700 nm, a full width at half maximum of 193 nm, and a quantum efficiency of 92%. In addition, 10% by weight of quantum dots, 70% by weight of isobornyl acrylate, 17% by weight of DPHA, and 3% by weight of OXE-3 initiator were included in 100% by weight of quantum dot resin.

Next, 5 ml of quantum dot resin is dropped on the first light transmitting member in a drop-casting format, covering the second light transmitting member, and irradiating ultraviolet light having a wavelength of 365 nm with an energy of 100 mJ to form the quantum dot resin. hardened. In this way, the light concentrator including the first and second light transmitting members and the quantum dot layer interposed therebetween was completed.

As can be seen from FIG. 4, the light concentrator using low iron glass and quartz as the light transmitting member has a light efficiency of 14 to 15%, and the light concentrator using common soda lime glass as the light transmitting member has a light efficiency of 8.4%. have That is, it can be seen that the light efficiency of the light-concentrating windows 100 using the low-iron light-transmitting member as the light-transmitting member is improved by about 70% compared to the light-concentrating windows and doors using general soda-lime glass as the light-transmitting member.

The second low iron light transmitting member 118 is a low iron light transmitting member laminated on the second surface S2 of the solar light collecting unit 111 . The second low iron light transmitting member 118 functions as a light transmitting member coated with a dye layer 115 for implementing gray while protecting the sunlight collecting unit 111 from the outside.

The dye layer 115 for implementing gray is a dye layer stacked on the opposite side of the solar light collector 111 among both sides of the second low iron light transmitting member 118 . In the present specification, "dye" may include "at least one of a dye soluble in water or an organic solvent and a pigment insoluble in water or an organic solvent".

When the dye layer 115 for implementing gray color overlaps with the light emitted from the second surface S2 of the solar light concentrating unit 111 , it implements gray color. For example, if the light emitted from the second surface S2 of the solar light concentrator 111 is red light, the gray dye layer 115 is implemented as a blue dye layer containing a blue dye, thereby generating red light. Gray may be implemented by overlapping blue light and blue light.

The second low refractive index layer 117 is stacked between the second low iron light transmitting member 118 and the gray dye layer 115 and has a refractive index lower than that of the gray dye layer 115 .

A third low iron light transmitting member 119 or a protective film (not shown) is laminated on the opposite side of the second low iron light transmitting member 118 among both sides of the gray dye layer 115 . The third low iron light transmitting member 119 or the protective film protects the gray dye layer 115 from the outside.

The window frame 120, referring to FIG. 1, is a frame extending along the edge of the window 110.

The solar cell 130 is a component that is disposed between the side of the solar collector 111 and the window frame 120 to convert light incident from the solar collector 111 into electrical energy.

The outer window frame movably supports the window frame 120 while extending along the outer surface of the window frame 120 . For example, the outer window frame may support the window frame 120 so that the window frame 120 is movable relative to the outer window frame in a sliding manner. Also, for example, the external window frame may be hingedly connected to the window frame 120 to support the window frame 120 so that the window frame 120 can move forward or backward.

According to the first feature of the embodiment of the present invention, the light concentrating window 100 includes a window 110, and the window 110 has a quantum dot layer 112 and one side or both sides of the quantum dot layer 112. It is laminated and has a first low refractive index layer 113 having a refractive index lower than that of the quantum dot layer 112, and a first surface S1 on which sunlight SL is incident and the first surface S1 a solar light concentrating unit 111 having an opposing second surface S2; a first low iron light transmission member 114 laminated on the first surface S1 of the solar light concentrating unit 111; a second low iron light transmission member 118 laminated on the second surface S2 of the sunlight concentrating part 111; and stacked on the opposite side of the solar light concentrating part 111 among both sides of the second low iron light transmitting member 118, and the light emitted from the second surface S2 of the solar light concentrating part 111. It is characterized in that it includes a dye layer 115 for implementing gray when overlapped with.

Accordingly, with respect to the light concentrator including the solar light concentrating unit 111 and the first light transmitting member stacked on the first surface S1 of the solar concentrating unit 111, the first light transmitting member is 1 low iron light transmission member 114, it is possible to improve the efficiency of the light concentrator. In addition, even if the light emitted from the second surface S2 of the sunlight concentrator 111 has a color that deteriorates aesthetics, for example, red, the light introduced into the room from the window 110 is used to implement a gray color. It can be converted into natural gray light by the dye layer 115. In addition, since the second low iron light transmitting member 118 is stacked between the dye layer 115 for gray implementation and the sunlight concentrating unit 111, by using the dye layer 115 for implementing natural gray color, It is possible to prevent the light intensity introduced into the room from being excessively lowered.

In addition, in the light collecting type window 100 according to the present embodiment, the window 110 is stacked between the second low iron light transmitting member 118 and the dye layer 115 for gray implementation, and the dye layer 115 for gray implementation Since it further includes a second low refractive index layer 117 having a refractive index lower than the refractive index of , light generated from the gray dye layer 115 itself, such as blue light, is directed toward the solar concentrator 111. Since leakage can be minimized, a natural gray color can be implemented even if a small amount of the dye layer 115 for implementing gray is used.

5 is a partial cross-sectional view of a light collecting type window or door according to a first modified example of an embodiment of the present invention.

Referring to FIG. 5 , a light collecting type window 100A according to a first modified example of an embodiment of the present invention includes a window 110A. In addition, the window 110A includes a sunlight concentrating unit 111A, a first low iron light transmitting member 114, and a dye layer 115 for implementing gray. In addition, the window 110A may further include a low refractive index layer 117a.

Compared to the light collecting window 100 shown in FIG. 2, the light collecting window 100A according to the first modified example is different only in the configuration of the sunlight collecting unit 111A of the window 110A, and the other components are similar. do.

Specifically, the sunlight concentrating part 111A includes a quantum dot member 112a and a low refractive index pattern 113a. In addition, the sunlight collecting unit 111A has a first surface S1 on which sunlight SL is incident and a second surface S2 opposite to the first surface S1. The quantum dot member 112a includes a plurality of quantum dots (QDs). The low refractive pattern 113a is provided on at least one of the surface and the inside of the quantum dot member 112a and has a refractive index lower than that of the quantum dot member 112a.

The low refractive index layer 117a is stacked between the second low iron light transmitting member 118 and the gray dye layer 115 and has a refractive index lower than that of the gray dye layer 115 .

6 is a partial cross-sectional view of a light collecting type window or door according to a second modified example of an embodiment of the present invention.

Referring to FIG. 6 , a light concentrating window 100B according to a second modified example of an embodiment of the present invention includes a first window 110a and a second window 110b opposite to the first window 110a. include Compared with the light collecting window 100 shown in FIG. It is different in that it is divided and arranged in , and the rest of the configuration is similar.

Specifically, the first window 110a includes a sunlight concentrating unit 111 and a first low iron light transmitting member 114 . In addition, the first window 110a may further include a second low iron light transmitting member 118 or a protective film (not shown) laminated on the second surface S2 of the solar light collecting unit 111 .

The second window 110b includes a low iron light transmitting member 116 for coating and a dye layer 115 for implementing gray. The low-iron light-transmitting member 116 for coating is a low-iron light-transmitting member for coating the dye layer 115 for gray implementation. The low iron light transmission member 116 for coating faces the first window 110a. The dye layer 115 for implementing gray is coated on the low iron light transmitting member 116 for coating.

In addition, the second window 110b may further include a second low refractive index layer 117 . The second low refractive index layer 117 is laminated between the low iron light transmission member 116 for coating and the dye layer 115 for gray implementation, and has a refractive index lower than that of the dye layer 115 for gray implementation.

In addition, the second window 110b may further include a third low iron light transmitting member 119 or a protective film. The third low-iron light-transmitting member 119 or protective film (not shown) is laminated on the opposite side of the low-iron light-transmitting member 116 for coating among both sides of the gray dye layer 115 .

7 is a partial cross-sectional view of a light collecting type window or door according to a third modified example of an embodiment of the present invention.

Referring to FIG. 7 , a light concentrating window 100C according to a third modified example of an embodiment of the present invention includes a first window 110aA and a second window 110b opposite to the first window 110aA. include Compared to the light collecting window 100A shown in FIG. 5 , the light collecting window 100C according to the third modified example includes elements of the window 110A including the first window 110aA and the second window 110b. It is different in that it is divided and arranged in , and the rest of the configuration is similar.

Specifically, the first window 110aA includes a sunlight concentrating unit 111A and a first low iron light transmitting member 114 . In addition, the first window 110aA may further include a second low iron light transmission member 118 or a protective film (not shown) laminated on the second surface S2 of the solar light collecting unit 111A.

The second window 110b includes a low iron light transmitting member 116 for coating and a dye layer 115 for implementing gray. The low-iron light-transmitting member 116 for coating is a low-iron light-transmitting member for coating the dye layer 115 for gray implementation. The low iron light transmission member 116 for coating faces the first window 110aA. The dye layer 115 for implementing gray is coated on the low iron light transmitting member 116 for coating.

In addition, the second window 110b may further include a low refractive index layer 117a. The low refractive index layer 117a is stacked between the low iron light transmission member 116 for coating and the dye layer 115 for gray implementation, and has a refractive index lower than that of the dye layer 115 for gray implementation.

In addition, the second window 110b may further include a third low iron light transmitting member 119 or a protective film (not shown). The third low-iron light-transmitting member 119 or protective film is laminated on the opposite side of the low-iron light-transmitting member 116 for coating among both sides of the gray dye layer 115 .

Although the present invention has been shown and described with reference to the preferred embodiments of the accompanying exemplary drawings, it is not limited thereto, and those skilled in the art to which the present invention pertains within the scope of the technical idea of the present invention described in the claims below. Of course, it can be implemented in various forms.

100, 100A, 100B, 100C: light-concentrating windows
110: window 110a: first window
110b: second window 111, 111A: solar light collector
112: quantum dot layer 112a: quantum dot member
113: first low refractive index layer 113a: low refractive index pattern
114: first low iron light transmission member 115: dye layer for gray implementation
116: low iron light transmission member for coating 117: second low refractive index layer
117a: low refractive index layer 118: second low iron light transmission member
119: third low iron light transmission member 120: window frame
130: solar cell

Claims (13)

In the light-collecting window including a window,
the window
A quantum dot layer and a first low refractive index layer laminated on one or both surfaces of the quantum dot layer and having a refractive index lower than that of the quantum dot layer, a first surface on which sunlight is incident and a first surface facing the first surface. A solar collector having two surfaces;
a first low iron light transmitting member laminated on the first surface of the solar light concentrating unit;
a second low iron light transmission member laminated on the second surface of the solar light concentrating unit; and
Among both sides of the second low iron light transmitting member, a dye layer for implementing a gray color is laminated on the opposite side of the solar light collecting unit and realizes gray color when overlapped with light emitted from the second surface of the solar light collecting unit.
Condensing window characterized in that it comprises a. In the light-collecting window including a window,
the window
A quantum dot member and a low refractive pattern provided on at least one of a surface and an inside of the quantum dot member and having a refractive index lower than that of the quantum dot member, and a first surface on which sunlight is incident and a surface facing the first surface. a solar light collector having a second surface;
a first low iron light transmitting member laminated on the first surface of the solar light concentrating unit;
a second low iron light transmission member laminated on the second surface of the solar light concentrating unit; and
Among both sides of the second low iron light transmitting member, a dye layer for implementing a gray color is laminated on the opposite side of the solar light collecting unit and realizes gray color when overlapped with light emitted from the second surface of the solar light collecting unit.
Condensing window characterized in that it comprises a. In the light collecting type window including a first window and a second window facing the first window,
The first window includes a quantum dot layer and a first low refractive index layer laminated on one or both surfaces of the quantum dot layer and having a refractive index lower than that of the quantum dot layer, and includes a first surface through which sunlight is incident and the first window. a solar light collector having a second surface facing the surface; and a first low-iron light-transmitting member laminated on the first surface of the solar light concentrating unit,
The second window may include a low iron light transmission member for coating facing the first window; And a dye layer for implementing gray color when coated on the low iron light transmitting member for coating and overlapping with the light emitted from the second surface of the solar concentrator.
A light-concentrating window, characterized in that. In the light collecting type window including a first window and a second window facing the first window,
The first window includes a quantum dot member and a low refractive pattern provided on at least one of a surface and an inside of the quantum dot member and having a refractive index lower than the refractive index of the quantum dot member, and includes a first surface on which sunlight is incident and the first window. a solar concentrator having a second surface facing the first surface; and a first low-iron light-transmitting member laminated on the first surface of the solar light concentrating unit,
The second window may include a low iron light transmission member for coating facing the first window; and a dye layer for realizing gray color when it is coated on the low iron light transmitting member for coating and overlaps with the light emitted from the second surface of the solar light concentrating unit. The method of claim 1 , wherein the window further comprises a second low refractive index layer laminated between the second low iron light transmitting member and the gray dye layer and having a refractive index lower than that of the gray dye layer. A concentrating window, characterized in that for. The method of claim 2, wherein the window further comprises a low refractive index layer laminated between the second low iron light transmitting member and the gray dye layer and having a refractive index lower than that of the gray dye layer. Characterized by light-concentrating windows. The method of claim 3 , wherein the second window comprises a second low refractive index layer laminated between the low iron light transmitting member for coating and the gray dye layer and having a refractive index lower than that of the gray dye layer. A light-concentrating window, characterized in that it further comprises. The method of claim 4, wherein the second window further comprises a low refractive index layer laminated between the low iron light transmitting member for coating and the dye layer for gray implementation, and having a refractive index lower than that of the dye layer for gray implementation. A concentrating window, characterized in that for. The light-collecting window or door according to claim 1 or 2, wherein the first low-iron light-transmitting member and the second low-iron light-transmitting member each contain at least one of low-iron glass and quartz. The light-collecting window or door according to claim 3 or 4, wherein the first low-iron light-transmitting member and the low-iron light-transmitting member for coating each contain at least one of low-iron glass and quartz. The light collecting type window or door according to claim 3 or 4, wherein the first window further comprises a second low iron light transmitting member or a protective film laminated on the second surface of the sunlight concentrating unit. The method of claim 1 or 2, wherein the window further comprises a third low iron light transmitting member or protective film laminated on a surface opposite to the second low iron light transmitting member among both sides of the gray dye layer. Characterized by light-concentrating windows. The method of claim 3 or 4, wherein the second window further comprises a third low-iron light-transmitting member or protective film laminated on a surface opposite to the low-iron light-transmitting member for coating among both sides of the gray dye layer. A concentrating window, characterized in that for.

Images