Patent ID: 7212355
Filing Date: 2007-05-01
Classification: G02B

Abstract:
1. An image pick-up lens system comprising: an aperture stop; a biconvex first lens; and a meniscus-shaped second lens having a concave surface on an object side, wherein the aperture stop, the first lens and the second lens are aligned in that order from the object side to an image side, the first lens is aspheric on both convex surfaces thereof, the second lens has at least one aspheric surface, the first and second lenses are made from the same material, and the following conditions are satisfied: wherein, f1 is a focal length of the first lens, f is a focal length of the system, R1 is an absolute value of a radius of curvature of the first lens on an object side, R2 is an absolute value of a radius of curvature of the first lens on the image side, and T is a length from the aperture stop to an image pick-up surface of the image side.