Patent ID: 8466075
Filing Date: 2013-06-18
Classification: C03C,Y10S

Abstract:
1. An optical glass comprising SiO 2 , in an amount of 9 mass % or below, B 2 O 3 and La 2 O 3 in an amount of 50 mass % or below, Li 2 O in an amount of 0.5% or over and one or more oxides selected from the group consisting of ZrO 2 , Nb 2 O 5 and Ta 2 O 5 , where the total amount of Gd 2 O 3 +Nb 2 O 5 is less than 10 mass %, said optical glass having a refractive index of 1.85 or over and an Abbe number of 35 or over, having a glass transition temperature (Tg) of 630° C. or below and being free of F.