OPTICAL GLASS, OPTICAL ELEMENT PREPARED WITH OPTICAL GLASS, AND OPTICAL DEVICE

摘要

PROBLEM TO BE SOLVED: To provide an optical glass of high refractive index and low specific gravity.;SOLUTION: An optical glass contains, in mass%, P₂O₅ component: 15.0-40.0%, B₂O₃ component: 2.7-10.0%, Li₂O component: 1.0-5.0%, TiO₂ component: 0 to less than 5.0%, and Nb₂O₅ component: 45.0-60.0%. The total amount of R¹₂O component (where, R¹ is at least one selected from Li, Na, and K) is 1.0 to less than 5.0%, the total amount of R²O component (where, R² is at least one selected from Mg, Ca, Sr, and Ba) is 6.8 to less than 21.0%, and the ratio of TiO₂ component/Nb₂O₅ component is less than 0.1. The optical glass substantially contains no Sb₂O₃ component.;SELECTED DRAWING: None;COPYRIGHT: (C)2018,JPO&INPIT