Patent ID: 8824065

Claim:
An imaging lens comprising: a control member that adjusts an amount of light incident on a lens; and a one-piece plastic lens, wherein the control member and one-piece plastic lens are placed in that order from the side of an object; a concave surface is formed on the object side of the lens, and a convex surface is formed on the image-point side thereof; the surfaces are constructed with aspherical surfaces; and the convex surface is a diffractive optical surface that exerts a chromatic dispersion ability, wherein a conditional expression (1) below is satisfied: 0.45< L/R≦ 0.573 (1) where L denotes a distance to an apparent stop seen from the apex of the convex surface on the assumption that a position at which a chief ray and an optical axis intersect is regarded as the apparent stop, and R denotes a curvature radius of the convex surface.