Patent ID: 8767298

Claim:
An imaging lens for an imaging element, comprising a first lens, a second lens, a third lens, a fourth lens, and a fifth lens arranged in sequence from an object side, wherein both surfaces of each lens are formed from aspheric surface, a diffraction optics surface exerting chromatic dispersion function is arranged directly on a surface on an image side of the second lens, each lens is configured from plastic material, and an aperture ratio is equal to or smaller than F/2.4, wherein the imaging lens satisfies the following conditional expressions: 0.9 <f/f 12 <1.2 (1) −0.23 <f/f 34 <0.12 (2) −0.72 <f/f 1 <0.1 (3) | f/f 5 |<0.2 (4) where f: focal length of overall system f 12 : composite focal length of the first lens and the second lens f 34 : composite focal length of the third lens and the fourth lens f 1 : focal length of the first lens f 5 : focal length of the fifth lens.