Patent ID: 8743485

Claim:
A wide-viewing-angle imaging lens assembly comprising, in order from an object side to an image side: a front lens group, a stop, and a rear lens group, wherein the front lens group comprises, in order from the object side to the image side: a first lens element with negative refractive power having a concave image-side surface, and a second lens element; wherein the rear lens group comprises, in order from the object side to the image side: a third lens element with positive refractive power having a concave object-side surface and a convex image-side surface, a fourth lens element with positive refractive power having a convex object-side surface and a convex image-side surface, and a fifth lens element with negative refractive power having a concave object-side surface, wherein the number of lens elements with refractive power does not exceed six; wherein the assembly is further provided with an electronic sensor disposed at an image plane for image formation of the object; and wherein the lens element with refractive power which is closest to an object is the first lens element, a focal length of the assembly is f, a focal length of the first lens element is f 1 , a focal length of the second lens element is f 2 , a focal length of the fourth lens element is f 4 , a distance on an optical axis between the second lens element and the third lens element is T 23 , a radius of curvature of the object-side surface of the fourth lens element is R 7 , a radius of curvature of the image-side surface of the fourth lens element is R 8 , half of a diagonal length of an effective pixel area of the electronic sensor is ImgH, and they satisfy the following relations: −0.78 <f/f 1<−0.25; 0.50 <f/f 4<1.00; | f 1 /f 2|<0.60; 0.02 <T 23 /f< 0.68; −3.50 <R 7 /R 8<−0.50; and 0.93 <ImgH/f< 2.30.