Patent ID: 8575047
Filing Date: 2013-11-05
Classification: C03C

Abstract:
1. An optical glass comprising, denoted as cationic percentages: as well as O and F, with the F/O molar ratio of the F content to the O content being 0.01 to 0.30; the combined sum of twice the LiO the value of twice the LiO the combined sum of the ZnO content, three times the ZrO the value of B the refractive index nd being 1.825 to 1.90; the Abbé number vd being 35 to 43; the degree of the refractive index and dispersion represented by nd−(2.25−0.01×vd) being 0.009 or greater; and the glass transition temperature Tg being 570° C. or lower.