Patent ID: 7525741

Claim:
A two-piece optical lens system for taking image comprising an aperture stop, a first lens element and a second lens element, from an object side wherein: the first lens element is a positive meniscus lens element has a convex object-side surface; the second lens element is a negative meniscus lens element has a convex image-side surface; both object-side surface and image-side surface of each lens element are aspheric, the first and second lens elements are made of plastic material, and they satisfy the relations: 0.55 <f 1 /f< 0.95; −2.0 <f 2 /f<− 1.0; 27.0<ν1−ν2; a focal length of the optical lens system is f, a focal lens of the first lens element is f1, the focal length of the second lens system is f2, an Abbe number of the first lens element is ν1, and the Abbe number of the second lens element is ν2.