Patent ID: 8508865

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 two convex surfaces along the optical axis of the imaging lens; a second lens of negative refraction power, with a convex surface on the object-side and having a meniscus shape; a third lens of positive refraction power, with a convex surface on the image-side and having a meniscus shape; a fourth lens of negative refraction power, with a convex surface on the object-side and having a meniscus shape; wherein the imaging lens satisfies the following conditions: 0.50≦f 1 /f≦0.75; 5.20≦f/d 1 ≦8.00; 12.00≦f/d 6 ≦45.00; −0.35≦R 1 /R 2 ≦−0.20; and 3.00≦R 3 /R 4 ≦20.00; Wherein: f is a focal length of the imaging lens; f 1 is a focal length of the first lens; d 1 is a center thickness of the first lens on the optical axis of the imaging lens; d 6 is a distance between the image-side surface of the third lens and the object-side surface of the fourth lens on the optical axis of imaging lens; R 1 is a radius of curvature of the object-side surface of the first lens; R 2 is a radius of curvature of the image-side surface of the first 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.