| 摘要 |
Provided is a Bi2O3-containing optical glass whereof the Abbe number [?d] has a characteristic value while a very large partial dispersion ratio [?g, F] is maintained. The optical glass which includes at least 45% of a Bi2O3 component as a mass% based on the oxides has a partial dispersion ratio [?g, F] of at least 0.63 and an Abbe number of not more than 27. The total content of the Bi2O3 component, BaO component, ZnO component, B2O3 component, SiO2 component and Sb2O3 component as a mass% based on the oxides is preferably less than 96%. Furthermore, the ratio of the B2O3 component with respect to the Bi2O3 component as a mass% based on the oxides is preferably less than 0.20. |
