Patent ID: 8508866

Claim:
An imaging lens, in the order from the object-side to the image-side of the imaging lens, comprising: a first lens of positive refraction power, with a convex surface on the object-side; an aperture stop, wherein the aperture stop is installed between the first lens and the second lens; a second lens of negative refraction power, with a convex surface on the image-side; a third lens of positive refraction power, with a convex surface on the object-side; wherein the imaging lens satisfies the following conditions: 0.80 ≦f 1 /f≦ 0.87; −2.00 ≦f 2 /f≦− 0.90; 0.35 ≦R 3 /R 4≦0.65; 0.01 ≦d 2 /d 3≦0.15; and 0.08 ≦d 5 /f≦ 0.18; Wherein: F is a focal length of the imaging lens; f 1 is a focal length of the first lens; f 2 is a focal length of the second lens; R 3 is a radius of curvature of the object-side surface of the second lens; R 4 is a radius of curvature of the image-side surface of the second lens; d 2 is a distance between the image-side surface of the first lens and the aperture stop on the optical axis of imaging lens; d 3 is a distance between the aperture stop and the object-side surface of the second lens on the optical axis of imaging lens; d 5 is distance between the image-side surface of the second lens and the object-side surface of the third lens on the optical axis of imaging lens.