Patent ID: 7570436

Claim:
A two piece type optical lens, in order from the object side towards the image side, comprising: an aperture stop; a first lens element with positive refractive power that is a meniscus aspherical lens having a convex surface on an object side, wherein the first lens element is made of molded glass; a second lens element with positive refractive power that is a meniscus aspherical lens having a convex surface on an image side, wherein the second lens element is made of molded glass; an IR(infrared) cut-off filter; and an image sensor arranged along an optical axis in order from the object side; wherein following expressions are satisfied: 0.6f≦d <0.9f; 0.5 <|R 3|≦10 f; 0.9 <|f 2 |/|f 1 |< 3;and 20≦Vd ≦85; wherein f is an effective focal length of the optical 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, f 1 is an effective focal length of the first lens element, f 2 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.