Patent ID: 8110515

Claim:
An optical glass comprising, by mass % on a basis of oxides, SiO 2 in 4.0 to 8.75%, B 2 O 3 in 15 to 28%, La 2 O 3 in 13 to 24.4%, and Gd 2 O 3 in 11.10 to 30%, and Li 2 O in 2.30 to 6.0%, and having a content of WO 3 of no more than 5.0%, and a content of ZnO of no more than 10%, wherein a temperature coefficient (20° C. to 40° C.) of a relative refractive index (546.07 nm) is no higher than 10.0×10 −6 (° C. −1 ).