Patent ID: 7492528
Filing Date: 2009-02-17
Classification: G02B

Abstract:
1. A two-piece type optical imaging lens comprising: a first lens element with positive refractive power that is a meniscus aspherical lens having the convex surface on object side and the concave surface on image side; a second lens element with positive refractive power that is a meniscus aspherical lens having the convex surface on image side and the concave surface on object side; an IR(infrared) cut-off filter; and an image sensor arranged along an optical axis in order from the object side; wherein following conditions are satisfied: wherein f is an effective focal length of the optical imaging lens, d is the distance between the object side of the first lens element and the image side of the second lens element, R 3 is a radius of curvature of the object side of the second lens element, f1 is an effective focal length of the first lens element, f2 is an effective focal length of the second lens element and Vd is Abbe's number of the first lens element as well as the second lens element.