Patent ID: 7529041

Claim:
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 2 , and it satisfies the relation: V 2 <40; a center thickness of the second lens element is CT 2 , and it satisfies the relation: 0.25 mm<CT 2 <0.4 mm.