Patent ID: 7943540
Filing Date: 2011-05-17
Classification: C03C

Abstract:
1. An optical glass for precision molding comprising, as glass components in wt %, 64 to 83% of Bi 4 to 17% of B 0 to 12% of GeO 0 to 7% of La 0 to 7% of Gd 0 to 4% of ZrO 0 to 5% of Ta 0 to 15% of ZnO; 0 to 2% of Sb 0 to 1% of In wherein the total of B wherein the total of La the optical glass having optical constants, that is, a refractive index nd of 2.05 to 2.25 and an Abbe number vd of 15 to 22, and a yield temperature At of 510° C. or less.