Patent ID: 7157391
Filing Date: 2007-01-02
Classification: C03C

Abstract:
1. An optical glass comprising, by mol%, 25 to 44% of P 2 O 5 , 10 to 40% of a total of Li 2 O, Na 2 O and K 2 O, 5 to 40% of ZnO, 1 to 35% of BaO, Nb 2 O 5 and Bi 2 O 3 , wherein the total content of P 2 O 5 , Li 2 O, Na 2 O, K 2 O, ZnO, BaO, Nb 2 O 5 , Bi 2 O3, WO 3 and B 2 O 3 is at least 99%, the optical glass having a glass transition temperature (Tg) of 370° C. or lower and being free of lead and fluorine.