Patent ID: 7528083
Filing Date: 2009-05-05
Classification: C03C,Y10S

Abstract:
1. An optical glass having a refractive index (nd) within a range from 1.825 to 1.870, an Abbe number (νd) within a range from 22 to less than 27, a transformation temperature (Tg) within a range from 530° C. to 585° C. and a mean coefficient of linear thermal expansion (α) within a range from 80×10 −7 ° C. −1 to 103×10 −7 ° C. −1 , comprising SiO 2 , TiO 2 , Nb 2 O 5 and Li 2 O and being substantially free of a Pb compound comprising, calculated on oxide basis and expressed in mass %;