Patent ID: 8089704
Filing Date: 2012-01-03
Classification: G02B

Abstract:
1. An imaging lens assembly 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 image-side surface; a third lens element having a concave object-side surface and a convex image-side surface, at least one of the object-side and image-side surfaces thereof being aspheric; a fourth lens element having a concave image-side surface, at least one of the object-side and image-side surfaces thereof being provided with at least one inflection point; and an aperture stop disposed between an imaged object and the second lens element; wherein an on-axis spacing between the first lens element and the second lens element is T12, a focal length of the imaging lens assembly is f, an Abbe number of the first lens element is V1, an Abbe number of the third lens element is V3, and they satisfy the relations: 0.5<(T12/f)*100<20, 23<V1−V3; and wherein there are only four lens elements with refractive power.