Patent ID: 8289628

Claim:
A five-lens imaging lens consisting essentially of: a negative first lens; a negative second lens having a concave surface facing the image side of the imaging lens; a positive third lens; an aperture stop; a positive fourth lens; and a fifth lens having a concave surface facing the object side of the imaging lens, which are arranged sequentially from the object side of the imaging lens, wherein at least one of the second lens, the fourth lens and the fifth lens has at least an aspheric surface, and wherein the Abbe number of the material of the third lens and the Abbe number of the material of the fifth lens for d-line are less than or equal to 30, and wherein the Abbe number of the material of the fourth lens for d-line is greater than or equal to 40, and wherein the following formula (1) is satisfied: 1.0<( R 3 âˆ’R 4)/( R 3 +R 4)â€ƒâ€ƒ(1), where R 3 : the paraxial curvature radius of an object-side surface of the second lens, and R 4 : the paraxial curvature radius of an image-side surface of the second lens.