Patent ID: 8294997

Claim:
An optical 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; a second lens element with negative refractive power having a concave object-side surface and a concave image-side surface; a third lens element with positive refractive power having a concave object-side surface and a convex image-side surface; and a fourth lens element with negative refractive power having a concave image-side surface, the object-side and image-side surfaces thereof being aspheric; wherein the optical imaging lens assembly further comprises an aperture stop disposed between an imaged object and the first lens element, and an electronic sensor at an image plane for image formation; wherein there are four lens elements with refractive power; and wherein a focal length of the optical imaging lens assembly is f, a focal length of the third lens element is f3, a focal length of the fourth lens element is f4, a radius of curvature on the object-side surface of the first lens element is R1, a radius of curvature on the object-side surface of the third lens element is R5, a distance on the optical axis between the object-side surface of the first lens element and the image-side surface of the second lens element is Dr1r4, a thickness on the optical axis of the third lens element is CT3, 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 relation: −0.60 <R 5 /f<− 0.20; 0.35 <f 3 /f< 0.91; −0.83 <f 4 /f<− 0.40; 1.00 <Dr 1 r 4 /CT 3<1.75; 0.20 <R 1 /f< 0.41; 0.9 <SL/TTL< 1.1.