Patent ID: 7251024
Filing Date: 2007-07-31
Classification: G01N

Abstract:
1. A defect inspection apparatus, comprising: a light source to emit light having plural wavelengths; an optical unit to irradiate a sample on which patterns are formed with the ultraviolet light having plural wavelengths through an objective lens; a table unit to mount said sample and movable at least in one direction; an image detecting unit to detect an image of said patterns on said sample through said objective lens with an image sensor by adjusting a polarization condition of said image by a polarization adjusting section to improve contrast of said image of said patterns and parallelly outputting a signal detected by said image sensor, wherein the image sensor is a time delay and integration (TDJ) sensor, and wherein a period Ts of scanning a pupil is required to be shorter than N times an accumulation time of one stage of the TDI sensor, where N is an integer; and an image processor to process a detected image by using a reference image and to detect a defect on said sample.