Patent ID: 7428109

Claim:
An image pickup lens system comprising, successively in order from an object side: an aperture stop; a first lens as a double-convex positive lens; and a second lens as a negative meniscus lens having a convex surface on an image side; each of the first and second lenses having at least one aspherical surface, said image pickup lens system satisfying the following conditional formulas (1), (2), and (3): 0.24<| f 1/ f 2|<0.68 (1) 0.83< R 1 /f <3.68 (2) 0.13< D 3 /f <0.31 (3) wherein f 1 is a focal length of the first lens; f 2 is a focal length of the second lens; R 1 is a paraxial radius of curvature of the surface on the object side of the first lens; f is a focal length of the entire system; and D 3 is an axial surface-to-surface distance between the first lens and the second lens.