Patent ID: 7541302

Claim:
An optical glass, wherein the optical glass fails to include La 2 O 3 and includes the following components: SiO 2 : 20 to 45% by weight; B 2 O 3 : 15 to 40% by weight; Al 2 O 3 : 4 to 15% by weight; MgO: 0 to 10% (including 0) by weight; CaO: 13 to 25% by weight; MgO+CaO: 13 to 25% by weight; Li 2 O: 12.5 to 25% by weight; Na 2 O: 0 to 10% (including 0) by weight; K 2 O: 0 to 10% (including 0) by weight; Li 2 O+Na 2 O+K 2 O: 12.5 to 25% by weight; SrO: 0 to 10% (including 0) by weight; BaO: 0 to 5% (including 0) by weight; and Sb 2 O 3 : 0 to 1% (including 0) by weight.