Patent ID: 7916401
Filing Date: 2011-03-29
Classification: G02B

Abstract:
1. An optical lens system for taking image comprising, in order from an object side to an image side: an aperture stop; a first lens element with positive refractive power having a convex object-side surface and a convex image-side surface; a plastic second lens element with negative 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 plastic third lens element with negative refractive power having a convex object-side surface and a concave image-side surface, at least one of the object-side and the image-side surfaces of the third lens element being aspheric; in the optical lens system for taking image, the number of the lens elements with refractive power being limited to three, a focal length of the optical lens system for taking image is f, a focal length of the first lens element is f