Patent ID: 7375903

Claim:
An imaging lens comprising: in order from an object side of the imaging lens, a first lens having a convex surface on the object side thereof and having a positive power; an aperture diaphragm; a second lens having a concave surface on the object side thereof and having a negative power; a third lens having a positive power; and a fourth lens having a convex surface on the object side thereof and near an optical axis thereof, the fourth lens having a meniscus shape, wherein the imaging lens satisfies conditional expressions: 0.2< D 2/ f< 0.4 (1) TL/f< 1.3 (2) wherein f represents a focal distance of the imaging lens; D 2 represents an air interval between the first lens and second lens along an optical axis of the imaging lens; and TL represents a distance along the optical axis from an object-side surface of the first lens to an image forming surface.