Patent ID: 8178452

Claim:
A glass for precision press molding 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, wherein the SiO 2 has a mass % that ranges from 18% to 36% calculated on oxide basis, the Nb 2 O 5 has another mass % that ranges from greater than 42% to 55% calculated on oxide basis, and a ratio of Nb 2 O 5 /TiO 2 is 2.7 or higher.