Patent ID: 8102608

Claim:
An imaging lens comprising: in order from an object side of the imaging lens, a first lens having a positive power; a second lens having a negative power, wherein the second lens has a meniscus shape in which a convex surface is directed toward the object side; a third lens having a positive power and having a convex surface on an image side thereof; and a fourth lens having a negative power and having a concave surface or a flat surface on the object side at the optical axis of the imaging lens, and a stop on the optical axis between a vertex of an object side surface of the first lens and a vertex of an image side surface of the first lens, the imaging lens satisfying conditional expressions (1′) and (6): 0.470≦| f 4/ f| <0.60 (1′) 0.1< D 4/ f< 0.3 (6) wherein f is a focal length of the imaging lens, f4 is a focal length of the fourth lens, and D4 is a space on the optical axis between the second lens and the third lens.