Patent ID: 7342729

Claim:
An imaging lens comprising, in order from an object side: a first lens having a positive refractive power; a second lens having a negative refractive power whose concave surface faces to the object; and a third lens having a positive refractive power and having a meniscus form that has a convex surface, facing to the object, in a portion at and around an optical axis of the imaging lens; wherein the first, second and third lenses have at least one aspheric surface, and wherein the imaging lens satisfies conditional expressions given below: 0.7 <f 1 /f< 1.3 (1) 0.3 <D 2 /f< 0.5 (2) 1.0 <|f 2 /f|< 3.0 (3) 1.2 <f 3 /f< 4.0 (4) where f: a focal length of an overall system, f 1 : a focal length of the first lens, f 2 : a focal length of the second lens, f 3 : a focal length of the third lens, and D 2 : a spacing, on the optical axis, between the first lens and the second lens.