Patent ID: 8488255
Filing Date: 2013-07-16
Classification: G02B

Abstract:
1. An image pickup optical system, comprising five lens elements with refractive power arranged sequentially 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 convex image-side surface; a third lens element with refractive power; a fourth lens element with refractive power, having a concave image-side surface, and at least one of an object-side surface and the image-side surface being aspheric; a fifth lens element with refractive power, having a concave image-side surface, and at least one of an object-side surface and the image-side surface being aspheric, and at least one of the object-side and image-side surfaces including at least one inflection point; and the image pickup optical system further comprising a stop; wherein R