Patent ID: 7529041
Filing Date: 2009-05-05
Classification: G02B

Abstract:
1. An optical lens system for taking image comprising three lens elements with refractive power, from the object side to the image side: a first lens element with positive refractive power having a convex object-side surface and a convex image-side surface, the object-side surface of the first lens element being aspheric; a plastic second lens element with negative refractive power having a concave object-side surface and a convex image-side surface, the object-side surface and the image-side surface of the second lens element being aspheric; a plastic third lens element with positive refractive power having a convex object-side surface and a concave image-side surface, the object-side surface and the image-side surface of the third lens element being aspheric; and an aperture stop located between the first lens element and the second lens element; the first lens element is made of plastic material, the image-side surface of the first lens element is aspheric, and the third lens element is formed with at least one inflection point; an Abbe number of the second lens element is V a center thickness of the second lens element is CT