Patent ID: 8792185

Claim:
An image lens system comprising, in order from an object side to an image side: a first lens element with negative refractive power comprising a concave image-side surface; a second lens element with positive refractive power comprising a convex object-side surface; a third lens element with negative refractive power comprising an object-side surface and a concave image-side surface, the object-side surface and the image-side surface being aspheric; a fourth lens element with positive refractive power comprising a convex object-side surface and a convex image-side surface; and a fifth lens element with negative refractive power comprising a convex object-side surface and a concave image-side surface, the object-side surface and the image-side surface being aspheric, the fifth lens element having at least one inflection point; the image lens system satisfying the following condition: 0 ≦R 6 |R 5 |<1.0 wherein R 5 is the curvature radius of the object-side surface of the third lens element, and R 6 is the curvature radius of the image-side surface of the third lens element.