Patent ID: 8501649

Claim:
An optical glass, comprising, in % by weight on an oxide basis, 30 to 50% of P 2 O 5 , 18 to 43% of BaO, 2 to 12% of B 2 O 3 , 1.4 to 5% of Al 2 O 3 , more than 0 to 6% of Li 2 O, more than 0 to 9% of La 2 O 3 , 0.1 to 8% of MgO, 0 to 10% of CaO, 0 to 15% of SrO, 0 to 5% of ZnO, 0 to 7% of Gd 2 O 3 , and 0 to 3% of SiO 2 , wherein the optical glass has a refractive index n d of 1.59 to 1.63 and an Abbe number ν d of 63 to 68.