Patent ID: 8670191

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 having a convex object-side surface and a concave image-side surface; a third lens element; a fourth lens element having a concave object-side surface and a convex image-side surface; and a fifth lens element with negative refractive power having an object-side surface and a concave image-side surface, the object-side and image-side surfaces thereof being aspheric, at least one surface thereof being provided with at least one inflection point; wherein the lens elements with refractive power in the imaging lens system are only the first, second, third, fourth and fifth lens elements; an Abbe number of the first lens element is V1, an Abbe number of the second lens element is V2, and the following relation is satisfied: V1−V2>20.