Patent ID: 8575048
Filing Date: 2013-11-05
Classification: C03C

Abstract:
1. An optical glass comprising, by cationic %, 20 to 50% of B 0 to 10% of Si 5 to 35% of La 0 to 10% of Gd 0 to 10% of Y 0 to 10% of Yb 0 to 4% of Ti 1 to 30% of Nb 0.5 to 15% of Ta 0 to 5% of W 0 to 10% of Zr 11 to 40% of Zn 0 to 10% of Mg 0 to 10% of Ca 0 to 10% of Sr 0 to 10% of Ba 0 to 10% of Li 0 to 10% of Na 0 to 10% of K 0 to 10% of Te 0 to 10% of Ge 0 to 10% of Bi 0 to 10% of Al the total content of B the total content of La the cationic ratio of ((B the total content of Ti the cationic ratio of ((Nb the cationic ratio of ((B the cationic ratio of ((La the cationic ratio of the content of Zn the optical glass having a refractive index nd of 1.89 or more and an Abbe's number νd of 27 to 37.