Patent · US Active

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

US9656905B2 · kind B2 · utility

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0References

8Claims

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Assignee

HOYA CORPORATION · JP

Inventors

Mikio Ikenishi · Shinjuku, JP
Yoshitake Tanno · Tokyo, JP

Key dates

Filing date	Aug 10, 2012
Grant date	May 23, 2017
Priority date	—
Expiry date	Sep 7, 2033

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC03C3/325
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

To provide a fluorophosphates glass having a weather-resistant property and having an O2−/P5+ ratio even after production, which is set so that Cu2+ 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 O2− with respect to a content of P5+ (O2−/P5+) 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 O2− and F− (F−/(O2−+F−)) in the fluorophosphates glass is 0.05 or more and 0.25 or less.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.