Patent ID: 8736981

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 convex image-side surface; 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; and an electronic sensor with a pixel area, wherein a gap exists between each two adjacent lens element along an optical axis of the imaging lens system; and 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 second lens element is V2, an Abbe number of the third lens element is V3, an on-axis spacing between the object-side surface of the first lens element and the electronic sensor is TTL, half of the diagonal length of the effective pixel area of the electronic sensor is ImgH, and the following relations are satisfied: | V 2 −V 3|<15; and TTL/ImgH<2.0.