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US 2021/0276914 A1Published application
Optical glass, optical element, optical system, interchangeable lens, and optical device
AssigneeHikari Glass Co., Ltd.
InventorsNoriaki IGUCHI, Miyuki ITO, Kazuma OHTAKA
Life of this patent
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Abstract
Provided is an optical glass including, by mass %, 24.5% to 41% of a P2O5 component, 6% to 17% of an Na2O component, 5% to 15% of a K2O component, over 0% to 7% or less of an Al2O3 component, 8% to 21% of a TiO2 component, and 5% to 38% of an Nb2O5 content, and the optical glass has a partial dispersion ratio (Pg, F) of 0.634 or less.
Claims15
An optical glass comprising:
- by mass %,
- 24.5% to 41% of a P2O5 content;
- 6% to 17% of an Na2O content;
- 5% to 15% of a K2O content;
- over 0% to 7% or less of an Al2O3 content;
- 8% to 21% of a TiO2 content;
- and
- 5% to 38% of an Nb2O5 content, wherein
- the optical glass has a partial dispersion ratio (Pg, F) of 0.634 or less.
6 more elements
Dependencies are inferred from the claim text.