Patent ID: 8395851
Filing Date: 2013-03-12
Classification: G02B

Abstract:
1. An optical lens system comprising, in order from an object side to an image side: a first lens element with positive refractive power having a convex object-side surface; a second lens element with negative refractive power having a concave object-side surface and a concave image-side surface; a third lens element with positive refractive power having a convex object-side surface and a convex image-side surface; a fourth lens element having a concave object-side surface and a convex image-side surface, at least one of the object-side and image-side surfaces thereof being aspheric; and a fifth lens element having a concave image-side surface, the object-side and image-side surfaces thereof being aspheric, at least one inflection point being formed on the image-side surface, and made of plastic, wherein the optical lens system is further provided with a stop disposed between an object and the third lens element, and an electronic sensor disposed at an image plane for the image formation of the object; a focal length of the optical lens system is f; a focal length of the third lens element is f