Patent ID: 8114796

Claim:
Lead- and fluorine-free optical glass with a refractive index n d of 1.60≦n d ≦1.64 and an Abbe number v d of 56≦v d ≦64, wherein the glass comprises the following composition (in % by weight based on oxides): P 2 O 5 26-35 B 2 O 3 10-15 Al 2 O 3 5.5-10 BaO 25-37 SrO 0-6 CaO 8-15 ZnO 5-10 Bi 2 O 3 0-8 Na 2 O 0-1.5 K 2 O 0-1.5 WO 3 0-10 La 2 O 3 0-2 Nb 2 O 5 0-1 TiO 2 0-<1 Σ alkaline earth metal oxides ≧41 Σ alkali metal oxides 0-1.5 at least one fining agent 0-0.5.