Patent ID: 6829047
Filing Date: 2004-12-07
Classification: G01N

Abstract:
A defect detection system for checking any defect in a pattern to be checked by comparing the pattern with a reference pattern, including:a stage for carrying a substrate on which a pattern to be checked is formed; an edge detection means for detecting a pattern edge of the pattern to be checked by scanning the substrate by laser beams and detecting reflected light thereof; an imaging means positioned above the stage for picking up an image of the pattern to be checked using a charge coupled device (CCD); a detection means for checking any defect in the pattern to be checked by comparing data of the pattern to be checked obtained by the imaging means with data of the reference pattern; and an adjustment means for adjusting a relative position of the substrate and the imaging means; wherein the imaging means picks up an image of the pattern to be checked after the adjustment means adjusts the relative position of the substrate and the imaging means so that the pattern edge of the pattern to be checked is substantially aligned with a side of pixels of the CCD.