Gasochromic system

Patent metadata

Field	Value
Publication number	US-9376854-B2
Application number	US-201314758986-A
Country	US
Kind code	B2
Filing date	Dec 16, 2013
Priority date	Jan 10, 2013
Publication date	Jun 28, 2016
Grant date	Jun 28, 2016

Abstract

A gasochromic system includes a first transparent part that includes a first surface; a second transparent part that includes a second surface and is disposed such that the second surface faces the first surface of the first transparent part; a light control part that is formed on the first surface and includes a light control element whose optical characteristic is reversibly changed by hydrogenation and dehydrogenation; a hydrogen supplier that supplies a hydrogen-containing gas into a gap between the first and second transparent parts; and a dehydrogenator that removes hydrogen from the gap between the first and second transparent parts. The first and second transparent parts are stacked via the light control part, and the second surface and a surface of the light control part facing the second surface are partially in contact with each other.

First claim

The invention claimed is:

1. A gasochromic system, comprising:
a first transparent part that includes a first surface;
a second transparent part that includes a second surface and is disposed such that the second surface faces the first surface of the first transparent part;
a light control part that is formed on the first surface and includes a light control element whose optical characteristic is reversibly changed by hydrogenation and dehydrogenation;
a hydrogen supplier that supplies a hydrogen-containing gas into a gap between the first and second transparent parts; and
a dehydrogenator that removes hydrogen from the gap between the first and second transparent parts,
wherein the first and second transparent parts are stacked via the light control part, and the second surface and a surface of the light control part facing the second surface are partially in contact with each other.

2. The gasochromic system as claimed in claim 1 , wherein the dehydrogenator includes a gas supplier that supplies a gas into the gap between the first and second transparent parts.

3. The gasochromic system as claimed in claim 2 , wherein the dehydrogenator includes at least one of
an oxygen reducer that reduces oxygen in the gas supplied by the gas supplier into the gap between the first and second transparent parts, and
a first moisture remover that removes moisture from the gas.

4. The gasochromic system as claimed in claim 3 ,
wherein the gas supplier is configured to recycle the gas supplied into the gap between the first and second transparent parts; and
wherein the gas supplier includes at least one of the oxygen reducer and the first moisture remover in a path for supplying the recycled gas again into the gap between the first and second transparent parts.

5. The gasochromic system as claimed in claim 2 , wherein the gas supplied by the gas supplier is an oxygen-containing gas.

6. The gasochromic system as claimed in claim 5 ,
wherein the dehydrogenator includes one of a hydrogen discharger that discharges hydrogen from the gap between the first and second transparent parts and a pressure reducer that reduces a pressure in the gap between the first and second transparent parts;
wherein the dehydrogenator is configured such that the gas supplier supplies the oxygen-containing gas into the gap between the first and second transparent parts to dehydrogenate the light control element after a hydrogen partial pressure in the gap between the first and second transparent parts is reduced by the hydrogen discharger or the pressure reducer; and
wherein an oxygen concentration of the oxygen-containing gas is determined such that an amount of water generated in the gap between the first and second transparent parts due to the supplied oxygen-containing gas does not exceed a saturation vapor pressure.

7. The gasochromic system as claimed in claim 1 , wherein the dehydrogenator includes one of a hydrogen discharger that discharges hydrogen from the gap between the first and second transparent parts and a pressure reducer that reduces a pressure in the gap between the first and second transparent parts.

8. The gasochromic system as claimed in claim 1 , further comprising:
a pressure reducer that reduces a pressure in the gap between the first and second transparent parts.

9. The gasochromic system as claimed in claim 1 , further comprising at least one of:
an oxygen remover that removes oxygen from the gap between the first and second transparent parts; and
a second moisture remover that removes moisture from the gap between the first and second transparent parts.

10. The gasochromic system as claimed in claim 9 , wherein the gasochromic system is configured such that at least one of the oxygen remover and the second moisture remover removes at least one of oxygen and moisture from the gap between the first and second transparent parts before the hydrogen supplier supplies hydrogen into the gap between the first and second transparent parts.

11. The gasochromic system as claimed in claim 1 , wherein the first and second transparent parts are comprised of glass or plastic.

12. The gasochromic system as claimed in claim 1 , wherein the light control part further includes a catalyst layer that functions as a catalyst for hydrogenation and dehydrogenation reactions of the light control element.

13. The gasochromic system as claimed in claim 12 , wherein the light control part further includes
a buffer layer that is disposed between the light control element and the catalyst layer and prevents interdiffusion of components of the light control element and components of the catalyst layer, and
a protective film that is formed on a surface of the catalyst layer, is permeable to hydrogen, and prevents oxidation of the light control element.

14. The gasochromic system as claimed in claim 12 , wherein
the light control element includes at least one of a magnesium alloy thin film and a transition metal oxide thin film; and
the catalyst layer includes a thin film that includes at least one of palladium and platinum.

15. The gasochromic system as claimed in claim 1 , wherein the hydrogen supplier includes a hydrogen generator that generates hydrogen.

16. The gasochromic system as claimed in claim 15 , wherein the hydrogen generator is configured to generate hydrogen from moisture in air.

17. The gasochromic system as claimed in claim 1 , further comprising:
a hydrogen concentration reducer that is disposed in a path for discharging the hydrogen-containing gas from the gasochromic system and reduces a concentration of hydrogen in the hydrogen-containing gas to be discharged,
wherein the hydrogen concentration reducer includes at least one of palladium and a hydrogen storage material.

18. The gasochromic system as claimed in claim 1 , further comprising:
a hydrogen concentration detector that detects a concentration of hydrogen in the gap between the first and second transparent parts,
wherein the hydrogen concentration detector is configured to detect the concentration of hydrogen by measuring an electric resistance of the light control element.

19. A gasochromic system, comprising:
a first transparent part that includes a first surface;
a second transparent part that includes a second surface and is disposed such that the second surface faces the first surface of the first transparent part;
a first light control part that is formed on the first surface and includes a light control element whose optical characteristic is reversibly changed by hydrogenation and dehydrogenation;
a second light control part that is formed on the second surface and includes a light control element whose optical characteristic is reversibly changed by hydrogenation and dehydrogenation;
a hydrogen supplier that supplies a hydrogen-containing gas into a gap between the first and second transparent parts; and
a dehydrogenator that removes hydrogen from the gap between the first and second transparent parts,
wherein the first and second transparent parts are stacked via the first and second light control parts, and facing surfaces of the first and second light control parts are partially in contact with each other.

Assignees

• Yoshimura Kazuki
• Yamada Yasusei
• Tajima Kazuki
• Nat Inst Of Advanced Ind Scien

Inventors

• Yoshimura Kazuki
• Yamada Yasusei
• Tajima Kazuki

Classifications

• G02F1/19

  based on variable-reflection or variable-refraction elements not provided for in groups G02F1/015 - G02F1/169 · CPC title

• G02F1/15

  based on an electrochromic effect · CPC title

• E06B3/6722 Primary

  with adjustable passage of light · CPC title

• E06B9/24

  Screens or other constructions affording protection against light, especially against sunshine; Similar screens for privacy or appearance; {Slat blinds}(operating, guiding or securing devices or arrangements for roll-type closures E06B9/56; free-hanging flexible screens A47H23/00) · CPC title

• E06B2009/2464

  featuring transparency control by applying voltage, e.g. LCD, electrochromic panels · CPC title