Patent ID: 8284502

Claim:
An optical lens assembly comprising, in order from an object side to an image side: a first lens element with positive refractive power; a second lens element with positive refractive power; a third lens element with negative refractive power having a concave object-side surface and 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 positive refractive power having an aspheric object-side surface and an aspheric image-side surface; wherein the number of lens elements with refractive power is four; and wherein a thickness of the first lens element on an optical axis is CT1, a thickness of the second lens element on the optical axis is CT2, a radius of curvature of the object-side surface of the fourth lens element is R7, a radius of curvature of the image-side surface of the fourth lens element is R8, a thickness of the fourth lens element on the optical axis is CT4, a focal length of the optical lens assembly is f, and they satisfy the relations: 0.0<CT1/CT2<0.6; |R7/R8|<1.0; and 0.25<CT4/f<0.85.