Fluorophosphate glass and method for producing the same and near-infrared absorbing filter

Patent metadata

Field	Value
Publication number	US-9656905-B2
Application number	US-201213571578-A
Country	US
Kind code	B2
Filing date	Aug 10, 2012
Priority date	Aug 11, 2011
Publication date	May 23, 2017
Grant date	May 23, 2017

Abstract

To provide a fluorophosphates glass having a weather-resistant property and having an O 2− /P 5+ ratio even after production, which is set so that Cu 2+ can be added with a quantity of such a degree suppressing an absorption of a visible light while absorbing a near-infrared light, and a method for producing the same, and a near-infrared light absorbing filter, wherein a molar ratio of a content of O 2− with respect to a content of P 5+ (O 2− /P 5+ ) in the fluorophosphates glass, is 3.2 or more and less than 3.4, and a molar ratio of a content of F − with respect to a total content of O 2− and F − (F − /(O 2− +F − )) in the fluorophosphates glass is 0.05 or more and 0.25 or less.

First claim

What is claimed is:

1. A fluorophosphates glass capable of absorbing a near-infrared light by containing Cu 2+ ,
wherein a molar ratio of a content of O 2− with respect to a content of P 5+ (O 2− /P 5+ ) in the fluorophosphates glass, is 3.2 or more and less than 3.4, and a molar ratio of a content of F − with respect to a total content of O 2− and F − (F − /(O 2− +F − )) in the fluorophosphates glass is 0.05 or more and 0.1533 or less,
the fluorophosphates glass does not contain B 3+ , Pb, Tl, ions thereof, and compounds thereof,
a content of Ba 2+ in the fluorophosphates glass is 2.35 cation % or more and 13.95 cation % or less, and
the fluorophosphates glass contains at least one kind selected from a group consisting of Cl − , Br − , and I − .

2. The fluorophosphates glass according to claim 1 , wherein a total content of Y 3+ , La 3+ , Gd 3+ , and Yb 3+ with respect to a content of all cationic components in the fluorophosphates glass is 0.5 cation % or more and 2.0 cation % or less.

3. A near-infrared light absorbing filter using the fluorophosphates glass of claim 1 .

4. The fluorophosphates glass according to claim 1 , wherein the molar ratio of content of F − with respect to the total content of O 2− and F − (F − /(O 2− +F − )) in the fluorophosphates glass is 0.0540 or more and 0.1500 or less.

5. The fluorophosphates glass according to claim 1 , wherein a content of Al 3+ with respect to a content of all cationic components in the fluorophosphates glass is 1.00 cation % or more and 9.00 cation % or less.

6. The fluorophosphates glass according to claim 1 , wherein a total content of Cl − , Br − , and I − in the fluorophosphates glass is from 0.1% to 3%.

7. A fluorophosphates glass capable of absorbing a near-infrared light by containing Cu 2+ ,
wherein a molar ratio of a content of O 2− with respect to a content of P 5+ (O 2− /P 5+ ) in the fluorophosphates glass, is 3.05 or more and less than 3.4, and a molar ratio of a content of F − with respect to a total content of O 2− and F − (F − /(O 2− +F − )) in the fluorophosphates glass is 0.03 or more and 0.19 or less,
the fluorophosphates glass does not contain B 3+ , Pb, Tl, ions thereof, and compounds thereof, and
a content of Ba 2+ in the fluorophosphates glass is 2.35 cation % or more and 13.95 cation % or less, and
the fluorophosphates glass contains at least one kind selected from a group consisting of Cl − , Br − , and I − .

8. The fluorophosphates glass according to claim 1 , wherein a total content of Cl − , Br − , and I − in the fluorophosphates glass is from 0.1% to 3%.

Assignees

• Ikenishi Mikio
• Tanno Yoshitake
• Hoya Corp

Inventors

• Ikenishi Mikio
• Tanno Yoshitake

Classifications

• C03C4/082 Primary

  for infrared absorbing glass · CPC title

• C03C3/325

  Fluoride glasses · CPC title

• C03C3/247

  containing fluorine and phosphorus · CPC title