Optical glass and optical components

Abstract

An optical glass with suppressed relative partial dispersion Pg,F and low specific gravity is provided, as well as an optical element made from the above optical glass. In this optical glass, the content of SiO2 is 10.0~40.0% by mass, the content of Li2O is greater than 0.0% by mass and less than 15.0% by mass, the content of Nb2O5 is 10.0~40.0% by mass, the content of B2O3 is greater than 0.0% by mass and less than 7.0% by mass, the content of ZnO is less than 5.0% by mass, the content of TiO2 is less than 13.0% by mass, the mass ratio of the total content of Na2O and K2O to the content of Li2O [(Na2O+K2O) / Li2O] is less than 1.50, and La2O3, Gd2O3, and Y2O are also present. The total content of Re2O3 and Yb2O3, the total content of MgO, CaO, SrO and BaO, and the total content of R'O relative to the total content of Li2O, Na2O and K2O, R2O, [(Re2O3+R'O) / R2O] are 0.79 or less. The total content of the above-mentioned total content of R2O and ZrO2 relative to the total content of SiO2 and B2O3, [(R2O+ZrO2) / (SiO2+B2O3)] are 0.50 or more. The total content of BaO and La2O3, [BaO+La2O3] is 5.0% by mass or less.