Patent ID: 7027640
Filing Date: 2006-04-11
Classification: G01N

Abstract:
1. An apparatus for detecting or inspecting defects on a pad for use in performing chemical mechanical polishing of a wafer, comprising: a pad driving device for loading the pad thereon and moving the pad; a camera installed to face the pad for converting an image of the pad into an electrical signal and outputting the converted electrical signal; a digital image data acquisition device for converting the electrical signal transmitted from the camera into a digital signal; and an image data processing unit for processing the image data and detecting the defects on the pad, wherein the image data processing unit calculates one or more of quantitative characteristic values of light based on the image data on any one of the points which are acquired from the image data acquisition device, and determines a location on the pad, where a difference between a level value obtained by combining one or more of the acquired quantitative characteristic values and a level value obtained from a normal surface of the pad is greater than a predetermined value, as a defect.