Patent ID: 8233224

Claim:
An imaging lens system including, 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 negative refractive power; a third lens element having a concave image-side surface; a fourth lens element with positive refractive power; a fifth lens element with negative refractive power having a concave image-side surface, at least one surface thereof being provided with at least one inflection point; and an aperture stop disposed between an imaged object and the third lens element; wherein an on-axis spacing between the first lens element and the second lens element is T 12 , a focal length of the imaging lens system is f, an Abbe number of the second lens element is V 2 , an Abbe number of the third lens element is V 3 , and T 12 , f, V 2 , and V 3 satisfy the relations: 0.5<(T 12 /f)×100<15; and |V 2 −V 3 |<15.