Patent ID: 8717690

Claim:
A photographing optical 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 image-side surface; a third lens element with positive 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 negative refractive power having a concave image-side surface, both of the object-side and image-side surfaces thereof being aspheric, at least one inflection point formed on the object-side and image-side surfaces; wherein the photographing optical lens assembly further comprises an aperture stop, disposed between the first lens element and the second element, and an electronic sensor, disposed at the image plane for image formation; wherein there are four lens elements with refractive power in the photographing optical lens assembly; and wherein a focal length of the photographing optical lens assembly is f, a focal length of the first lens element is f 1 , a focal length of the third lens element is f 3 , an Abbe number of the first lens element is V 1 , an Abbe number of the second lens element is V 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 third lens element is R 5 , a radius of curvature of the image-side surface of the third lens element is R 6 , a distance on the optical axis between the aperture stop and the image plane is SL, a distance on the optical axis between the object-side surface of the first lens element and the electronic sensor is TTL, half of the diagonal length of the effective pixel area of the electronic sensor is ImgH, and they satisfy the relations: −0.27<( f/f 1)−( f/f 3)<−0.05; 31.0 <V 1 −V 2<42.0; −2.00 <R 1 /R 2<−0.01; 1.40 <R 5 /R 6<4.30; 0.77 <SL/TTL< 0.92; and TTL/ImgH< 1.95.