Patent ID: 7969664

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 having a concave object-side surface; a third lens element with positive refractive power having a convex image-side surface, at least one of the object-side and image-side surfaces thereof being aspheric; and a fourth lens element with negative refractive power having a convex object-side surface and a concave image-side surface on which at least one inflection point is formed; wherein there are four lens elements with refractive power; wherein the imaging lens assembly further comprises an aperture stop disposed between the first and second lens elements and an electronic sensor on which an object is imaged; and wherein an on-axis spacing between the aperture stop and the electronic sensor is SL, an on-axis spacing between the object-side surface of the first lens element and the electronic sensor is TTL, and they satisfy the relation: 0.75<SL/TTL<0.90.