Patent ID: 8861100

Claim:
An imaging lens comprising: at least one lens unit including a junction type compound lens having a plane parallel glass plate formed of optical glass, an object side resin lens formed of energy-curable resin, bonded to an object side surface of the plane parallel glass plate and being a planoconvex lens with a convex surface facing the object side having a positive refractive power, and an image side resin lens formed of energy-curable resin, bonded to an image side surface of the plane parallel glass plate and being a planoconcave lens with a concave surface facing the image side having a negative refractive power, wherein the imaging lens satisfies Expressions (1) to (8) as follows, N 1 ≦N 2 ≦N 3 (1), 0.08 ≦N 3 −N 1 ≦0.15 (2) 0 ≦N 2 −N 1 ≦0.1 (3), 0 ≦N 3 −N 2 ≦0.1 (4), |υ1−υ2|≦30 (5), |υ2−υ3|≦32.48 (6), 29.5≦υ1−υ3≦40 (7), and υ2≧50 (8), where N 1 is a refractive index of the object side resin lens, N 2 is a refractive index of the plane parallel glass plate, N 3 is a refractive index of the image side resin lens, υ 1 is an Abbe number of the object side resin lens, υ 2 is an Abbe number of the plane parallel glass plate, and υ 3 is an Abbe number of the image side resin lens.