Patent ID: 9632292
Date: 2017-04-25
CPC Classifications: G02B,H04N

Claim:
1. A cemented lens comprising: a negative lens having negative power; and a positive lens having positive power, the negative lens and the positive lens being bonded together with an adhesive layer, wherein both surfaces of the negative lens are aspheric in shape, both surfaces of the positive lens are aspheric in shape, one of a cemented surface of the negative lens on a side of the positive lens and a cemented surface of the positive lens on a side of the negative lens is a concave surface and another is a convex surface, the concave surface and the convex surface have different aspheric shapes, and following conditional expression (a) is satisfied: where Sg1H represents sag in the concave surface at height H in an effective diameter of the concave surface in a direction orthogonal to an optical axis, and Sg2H represents sag in the convex surface at the height H.