| 摘要 |
An optical glass having a refractive index (nd) within a range from 1.825 to 1.870, an Abbe number (nud) within a range from 22 to less than 27, a transformation temperature (Tg) within a range from 530° C. to 585° C. and an mean coefficient of linear thermal expansion (alpha) within a range from 80x10-7° C.-1 to 103x10-7° C.-1, comprising SiO2, TiO2, Nb2O5 and Li2O and being substantially free of a Pb compound.
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