Optical glass, optical element and optical device using optical glass

Abstract

To provide an optical glass which has a unique combination of anomalous dispersibility in a visible range with that in a near-infrared range. Provided is an optical glass containing respective components of SiO2 from 14 to 26% by mass, B2O3 from 9 to 16% by mass, and La2O3 from 10 to 42% by mass as essential components, and containing respective components of ZnO, Y2O3, ZrO2, Ta2O5, Li2O, and Na2O as optional components, and satisfying respective relationships of SiO2+B2O3 from 28 to 36% by mass, ZrO2+Ta2O5 from 6 to 16% by mass, La2O3+Y2O3+ZnO from 43 to 59% by mass, and Li2O+Na2O from 2 to 14% by mass.

Dependencies are inferred from the claim text.