Patent ID: 8189272
Filing Date: 2012-05-29
Classification: G02B

Abstract:
1. An optical lens assembly for image taking, sequentially from an object side to an image side along an optical axis, comprising: a first lens element with refractive power; a second lens element with positive refractive power, being bi-convex; a third lens element with negative refractive power, having a concave object-side surface and a convex image-side surface, and at least one of the object-side and image-side surfaces of the third lens element being aspheric; and a fourth lens element with positive refractive power, having a convex object-side surface and a concave image-side surface, and at least one of the object-side surface and the image-side surface having at least one inflection point; wherein f is a focal length of the optical lens assembly for image taking, f