Patent ID: 7312169

Claim:
A high refractive index, high dispersion optical glass for precision molding, having a yield temperature (At) of at most 550° C., refractive index (nd) of at least 1.83 and Abbe number (νd) of at most 26.0, which is represented, in terms of atoms for making up the glass, by the following chemical composition (wt %): P 2 O 5 15 to 29% B 2 O 3 0 to 2% GeO 2 0 to 14% Sum of P 2 O 5 + B 2 O 3 + GeO 2 20 to 35% Li 2 O 0 to 5% Na 2 O 3 to 14% K 2 O 0 to 9% Sum of Li 2 O + Na 2 O + K 2 O 5 to 15% Nb 2 O 5 2 to less than 22% Bi 2 O 3 34 to 60% WO 3 0 to 3.0% BaO 0 to 5% In 2 O 3 0 to 7%.