Patent ID: 7989377
Filing Date: 2011-08-02
Classification: C03C

Abstract:
1. An optical glass comprising as cationic components, by cationic %, 20 to 50% of P 0.1 to 20% of Al 0.1 to 20% of Mg 0 to 20% of Ca 0 to 20% of Sr 0.1 to 30% of Ba 0 to 10% of Y and further comprising, as anionic components, F wherein the total content of P wherein the ratio of the content of Ba the optical glass having a refractive index (nd) of 1.54 to 1.60, an Abbe's number (vd) of 65 to 78, a partial dispersion ratio of 0.530 or more, a specific gravity of 4.0 or less and a viscosity, measured at its liquidus temperature, of 4 dPa·s or more.