Patent ID: 7952818
Filing Date: 2011-05-31
Classification: G02B

Abstract:
1. An optical imaging lens assembly 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 having a concave object-side surface; a third lens element with positive refractive power; a fourth lens element having a convex object-side surface and a concave image-side surface; a first stop disposed between the first lens element and the second lens element; and a second stop disposed between the second lens element and the fourth lens element; wherein the lens assembly is further provided with an electronic sensor for the image formation of an object; a focal length of the first lens element is f1; a focal length of the second lens element is f2; half of a diameter of the second stop is YS; half of a diagonal length of an effective pixel area of the electronic sensor is ImgH; a distance on an optical axis between the second stop and an object-side surface of an adjacent lens element relative to the object side of the second stop is DS; a distance on the optical axis between the object-side surface of the adjacent lens element relative to the object side of the second stop and an image-side surface of an adjacent lens element relative to the image side of the second stop is DL; a distance on the optical axis between the first lens element and the second lens element is T12; a focal length of the lens assembly is f; and a distance on the optical axis between the object-side surface of the first lens element and the electronic sensor is TTL, they satisfy the following relations: