Patent ID: RE42642

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<f1/f<1.3 (1) 0.3<D2/f<0.5 (2) 0.21≦D2/f<0.5 (2′) 1.0<|f2/f|<3.0 (3) 1.2<f3/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.