Patent ID: 7514381

Claim:
An optical glass consisting essentially of, as represented by mol % based on the following oxides: from 35 to 54% of TeO 2 ; from 0 to 10% of GeO 2 ; from 5 to 30% of B 2 O 3 ; from 0 to 15% of Ga 2 O 3 ; from greater than 0 to 8% of Bi 2 O 3 ; from 3 to 20% of ZnO; from 0 to 10% of MgO+CaO+SrO+BaO; from 1 to 10% of Y 2 O 3 +La 2 O 3 +Gd 2 O 3 ; from 0 to 5% of Ta 2 O 5 +Nb 2 O 5 ; from 0 to 1.8% of TiO 2 ; and from 0 to 6% of Li 2 O+Na 2 O+K 2 O+Rb 2 O+Cs 2 O.