Patent ID: 7813056

Claim:
An imaging lens comprising, in order from an object side: a first lens having a negative refractive power with a concave surface on an image side thereof; a second lens with at least one aspherical surface; an aperture stop; and a third lens having a positive refractive power with at least one aspherical surface, wherein the first lens is formed of an optical glass whose Abbe number is 40 or more, the second lens is formed of a plastic whose Abbe number is 40 or less, and the third lens is formed of a plastic whose Abbe number is 50 or more, wherein assuming that a point, where a light ray which constitutes an outermost light ray in light rays which enter an image plane intersects a lens surface, constitutes an effective aperture terminating edge, the second lens is such that an intersection point between an object side surface and an optical axis lies closer to an image forming side of the imaging lens than an effective aperture terminating edge of the object side surface does, wherein, letting focal lengths of the second lens and the third lens be f 2 , f 3 , respectively, the following conditional expression is satisfied: 0.2< f 2/ f 3≦3.54 (2′), and wherein letting a distance from an apex on an object side surface of the first lens to the image plane be L and a focal length of the first lens be f 1 , the following conditional expression is satisfied: 0.5<| L/f 1|≦2.62 (1″).