Patent ID: 7436604
Filing Date: 2008-10-14
Classification: G02B

Abstract:
1. An optical lens system for taking image comprising two lens elements with refractive power and an aperture stop, from the object side to the image side: a first 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 first lens element being aspheric; a second lens element with negative refractive power having a concave object-side surface and a concave image-side surface, the object-side surface and the image-side surface of the second lens element being aspheric, the image-side surface of the second lens element being formed with an inflection point; and the aperture stop located in front of the first lens element; wherein a focal length of the second lens element is f