Patent ID: 7892998
Filing Date: 2011-02-22
Classification: C03C

Abstract:
1. An optical glass comprising, based on a total weight of the optical glass: 15 to 40 weight percent of P 0 to 10 weight percent of Li 0 to 20 weight percent of Na 0 to 20 weight percent of K more than 2 weight percent and not more than 15 weight percent of TiO 0 to 15 weight percent of CaO; 0 to 32 weight percent of BaO; 0 to 0.8 weight percent of SrO; 0 to 4 weight percent of ZnO; 0 to less than 3 weight percent of Bi 0 to 31.5 weight percent of Nb 0 to less than 20 weight percent of WO 0 to 1 weight percent of Sb wherein a total weight of Li the optical glass does not comprise B a glass transition temperature Tg of the optical glass is not higher than 540° C.