Patent ID: 7947617

Claim:
An optical glass formed of an oxide glass devoid of Ga 3+ comprising, by cationic %, 30 to 70% of Bi 3+ , 5 to 50% of B 3+ , 0.5 to 50% of Si 4+ , 1 to 20% of Al 3+ , 0 to 20% of Li + , 0 to 15% of Na + , 0 to 10% of K + , has, by cationic %, an Li + , Na + and K + total content of 0 to 20% and a Ba 2+ and Zn 2+ total content of 0 to 10%, and, has an Al 3+ /Si 4+ ratio of 0.2 or more by cationic ratio, and having a liquidus temperature of 800° C. or lower.