Patent ID: 7894142

Claim:
A photographing optical lens system 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 positive refractive power having a convex image-side surface; a third lens element with positive refractive power having a convex object-side surface and a concave image-side surface, the object-side and the image-side surfaces thereof being aspheric, at least one of the surfaces having at least one inflection point; wherein the photographing optical lens system further comprises an aperture stop disposed between an imaged object and the second lens element, and there are three lens elements with refractive power; wherein a focal length of the photographing optical lens system is f, a focal length of the first lens element is f1, a distance on the optical axis between the second and the third lens elements is T23, and they satisfy the relation: 0.23 <f/f 1<0.67; 0.05 <T 23 /f< 0.18.