Patent ID: 7564635
Filing Date: 2009-07-21
Classification: G02B

Abstract:
1. An optical lens system for taking image consisting of three lens elements with refractive power, in order from the object side to the image side: an aperture stop; a first lens element with positive refractive power having a convex object-side surface; a plastic second lens element with positive refractive power having a concave object-side surface and a convex image-side surface, at least one of the object-side and the image-side surfaces of the second lens element being aspheric; and a third lens element with positive refractive power having a convex object-side surface, at least one of the object-side and the image-side surfaces of the third lens element being aspheric; a focal length of the optical lens system for taking image being f, a focal length of the second lens element being f2, a focal length of the third lens element being f3, at least one of the relations of f/f2 and f/f3 being larger than 0.1.