Patent ID: 8951926
Filing Date: 2015-02-10
Classification: C03C

Abstract:
1. An optical glass for press molding, having a refractive index nd of 1.925 or more, an Abbe's number νd of 10 to 30, and a glass composition, in % by mass, of 75 to 86% Bi 2 O 3 , 10 to 22.3% B 2 O 3 , 0 to 10% ZnO, 0 to 2.1% GeO 2 , 0 to 5% La 2 O 3 +Gd 2 O 3 +Ta 2 O 5 , and 99.99% or less Bi 2 O 3 +B 2 O 3 , and being substantially free of lead component, arsenic component, and F component, wherein the coloration λ 70 is 475 nm or less.