Patent ID: 8154807

Claim:
An imaging lens assembly comprising, in order from an object side to an image side: a first lens element with positive refractive power having a convex object-side surface and a convex image-side surface; a second lens element with negative refractive power, at least one of the object-side and image-side surfaces thereof being aspheric; and a third lens element with negative refractive power having a concave image-side surface, both of the object-side and image-side surfaces thereof being aspheric; and wherein the imaging lens assembly further comprises an aperture stop disposed between the first lens element and the second lens element, and an electronic sensor for image formation; wherein there are three lens elements with refractive power; and wherein a focal length of the imaging lens assembly is f, a focal length of the second lens element is f 2 , a radius of curvature of the object-side surface of the first lens element is R 1 , a radius of curvature of the image-side surface of the first lens element is R 2 , a radius of curvature of the object-side surface of the second lens element is R 3 , a distance on the optical axis between the aperture stop and the electronic sensor is SL, a distance on the optical axis between the object-side surface of the first lens element and the electronic sensor is TTL, and they satisfy the following relations: −0.70 <f/f 2<−0.24; −0.30 <R 1 /R 2<0.00; −0.40 <R 3 /f<− 0.24; 0.75 <SL/TTL< 0.90.