Patent ID: 8558939

Claim:
An image pickup lens comprising, in order from an object side thereof, an aperture stop, a first lens, a second lens and a third lens, wherein the first lens is a positive lens and is a meniscus lens having a convex surface facing the object side and a concave surface facing an image side, the second lens is a lens including a concave surface facing the object side, the third lens is a negative lens, and the image pickup lens satisfies the following expressions: 0.10<D4/f<0.25 (1) 0.00≦|f/f2|<0.65 (2) −2.50<f/r3<0.00 (3) where D4 is a distance (mm) of an air gap on an optical axis between the second lens and the third lens, f is a focal length (mm) of a total system of the image pickup lens, f2 is a focal length (mm) of the second lens, and r3 is a curvature radius (mm) of the surface facing the object side of the second lens.