Patent ID: 6333282
Filing Date: 2001-12-25
Classification: C03C,Y10S

Abstract:
A high refractive index, high dispersion optical glass or precision molding, having a yield temperature (At) of at most 550.degree. C., refractive index (nd) of at least 1.83 and Abbe number (.nu.d) of at most 26.0, which is represented, in term of atoms for making up the glass, by the following chemical composition (wt %):P.sub.2 O.sub.5 14.0 to 31.0% B.sub.2 O.sub.3 0 to 5.0% GeO.sub.2 0 to 14.0% Sum of P.sub.2 O.sub.5 + B.sub.2 O.sub.3 + GeO.sub.2 14.0 to 35.0% Li.sub.2 O 0 to 6.0% Na.sub.2 O 2.5 to 14.0% Sum of Li.sub.2 O + Na.sub.2 O 2.5 to 15.0% Nb.sub.2 O.sub.5 25.0 to 50.0% WO.sub.3 0 to 30.0% Bi.sub.2 O.sub.3 5.0 to 36.0% BaO 0 to 22.0%.