Patent ID: 8274745

Claim:
An image pickup lens, comprising sequentially from an object side: an aperture stop, a first lens, and a second lens, wherein the first lens is a positive meniscus lens which has a convex surface at the object side and a concave surface at an image side opposite to the object side, the second lens has a concave surface at the object side and an image side surface whose radius of curvature on an paraxial region is infinite or a negative value, and the image side surface of the second lens includes an aspheric surface on which a positive power is made strong toward a lens peripheral region, and wherein the image pickup lens is made to satisfy the following conditional formulas: 1.55 <n 1<1.80 (1) 1.063/2.962 ≦D 3 /f <0.6 (2) 40.0<v2<90.0 (3) −0.15 <f/r 4<0.0 (4) where n 1 represents a refractive index of the first lens for d spectral line, D 3 represents a thickness (mm) of the second lens on an optical axis, f represents a focal distance (mm) of an entire system of the image pickup lens, v 2 represents of an Abbe's number of the second lens, and r 4 represents a radius of curvature (mm) of an image side surface of the second lens.