Patent ID: 8124552

Claim:
An optical glass comprising, by weight: 1% or more and 5% or less of silicon oxide (SiO 2 ); 15% or more and 24% or less of boron oxide (B 2 O 3 ); 0.1% or more and 3% or less of aluminum oxide (Al 2 O 3 ); 1% or more and 14% or less of zinc oxide (ZnO); 35% or more and 45% or less of lanthanum oxide (La 2 O 3 ); 5% or more and 10% or less of yttrium oxide (Y 2 O 3 ); 5% or more and 13% or less of tantalum oxide (Ta 2 O 5 ); and 0.5% or more and 3% or less of lithium oxide (Li 2 O).