Patent ID: 8012896

Claim:
An optical glass having a refractive index nd of 1.70 or higher and an Abbé number nud of 50 or higher, comprising, denoted as molar percentages: B 2 O 3 40 to 75 percent, SiO 2 greater than 0 percent but not exceeding 15 percent, Li 2 O 1 to 10 percent, ZnO 0 to 15 percent, La 2 O 3 5 to 22 percent, Gd 2 O 3 3 to 20 percent, Y 2 O 3 greater than or equal to 0 percent but less than 1 percent, ZrO 2 0 to 10 percent, MgO 0 to 5 percent, F 5 percent or less, CaO 0 to 5 percent, and SrO 0 to 5 percent.