Patent ID: 6828265
Filing Date: 2004-12-07
Classification: C03C

Abstract:
An optical glass having a refractive index of (nd) of 1.88 or over and an Abbe number (&ngr;d) within a range from 22 to 28, comprising, in mass %,SiO215-25%B2O30-5%La2O30-5%TiO2â€‚5-15%ZrO2â€‚0-10%Nb2O5more than 30and less than 50%WO30-5%CaOâ€‚0-10%BaOâ€‚0-10%Li2Oâ€‚3-12%Na2Oâ€‚0-10%K2Oâ€‚0-10%Bi2O3â€‚0-15%and having a glass transition point (Tg) within a range from 500Â° C. to 580Â° C.