Patent ID: 6875714

Claim:
An optical glass consisting essentially, expressed in term of weight percent, of: P 2 O 5 : 20.0 to 30.0%, B 2 O 3 : 0.5 to 10.0%, Nb 2 O 5 : 25.0 to 50.0%, WO 3 : 15.0 to 27.0%, Bi 2 O 3 : 0.1 to 3.0%, ZnO: 1.0 to 7.0%, Li 2 O: 0 to 8.0%, Na 2 O: 0 to 15.0%, K 2 O: 0 to 15.0%, and Li 2 O+Na 2 O+K 2 O: 5.0 to 20.0%.