Patent ID: 7848032

Claim:
An imaging lens assembly comprising, in order from an object side to an image side: a first lens element with negative refractive power having a convex object-side surface and a concave image-side surface; a second lens element with positive refractive power having a convex image-side surface; a third lens element with negative refractive power having a concave object-side surface and a convex image-side surface, both surfaces being aspheric; a fourth lens element with positive refractive power having a convex object-side surface, the object-side and image-side surfaces thereof being aspheric; and a stop disposed between the first lens element and the second lens element; wherein a distance near the optical axis between the first lens element and the second lens element is T 12 , a focal length of the imaging lens assembly is f, a focal length of the second lens element is f 2 , the number of the lens elements with refractive power is N, and they satisfy the relations: 0.00<T 12 /f<2.50, 0.60<f/f 2 <1.72, 4≦N≦6.