Patent ID: 7897532
Filing Date: 2011-03-01
Classification: C03C

Abstract:
1. An optical glass composition comprising, in % by weight, 1.0% or more and 12.0% or less of SiO 8.0% or more and 18.0% or less of B 0% or more and 6.0% or less of ZnO, 1.0% or more and 10.0% or less of ZrO 25.0% or more and 47.0% or less of La 0% or more and 5.0% or less of R 0% or more and 15.0% or less of Nb 0% or more and 7.0% or less of TiO 0% or more and 15.0% or less of Ta 1.0% or more of Nb 0% or more and 25.5% or less of Gd 0.5% or more and 15.0% or less of WO 0.5% or more and 26.0% or less of Gd substantially not containing Y a refractive index (nd) to the d-line of 1.88 or higher and 1.92 or lower and an Abbe number (νd) to the d-line of 33 or higher and 37 or lower.