Patent ID: 8077400

Claim:
A thin type optical lens system for taking image comprising three lens elements with refractive power, from the object side to the image side: a first lens element with positive refractive power having a convex aspheric object-side surface and a convex aspheric image-side surface; an aperture stop; a second lens element with negative refractive power having a concave aspheric object-side surface and a convex aspheric image-side surface; a third lens element with negative refractive power having a convex aspheric object-side surface and a concave aspheric image-side surface, and the third lens element being formed with at least one inflection point; wherein the first lens element, the second lens element and the third lens element are made of plastic material; wherein an on axis distance between the second lens element and the third lens element is T 23 , a center thickness of the third lens element is CT 3 , an Abbe number of the first lens element is V 1 , an Abbe number of the second lens element is V 2 , an Abbe number of the third lens element is V 3 , a focal length of the first lens element is f 1 , a focal length of the second lens element is f 2 , a focal length of the third lens element is f 3 , a focal length of the thin type optical lens system for taking image is f, and they satisfy the relations: T 23/ CT 3<0.3; ( V 1+ V 3)/2− V 2>20; 1.35< f/f 1<1.5; −0.3< f/f 2<0; −0.2< f/f 3<0.