Patent ID: 8514501

Claim:
An optical image 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 negative refractive power having a concave object-side surface and a convex image-side surface; a third lens element with negative refractive power having a concave image-side surface; a fourth lens element with refractive power having a concave object-side surface and a convex image-side surface, wherein the object-side surface and the image-side surface of the fourth lens element are aspheric; and a fifth lens element with negative refractive power having a concave image-side surface, wherein an object-side surface and the image-side surface of the fifth lens element are aspheric, and the fifth lens element has at least one inflection point formed on at least one of the object-side surface and the image-side surface thereof; wherein a curvature radius of the object-side surface of the third lens element is R 5 , a curvature radius of the image-side surface of the third lens element is R 6 , a central thickness of the second lens element is CT 2 , a central thickness of the third lens element is CT 3 , and an axial distance between the second lens element and the third lens element is T 23 , the following relationships are satisfied: 0<( R 5+ R 6)/( R 5− R 6)<5.0; and 0.5<( CT 2+ CT 3)/ T 23<2.5.