Patent ID: 6583414
Filing Date: 2003-06-24
Classification: G01N,G06T,H01J

Abstract:
An inline pattern inspection system comprising:means for radiating and scanning an electron beam to a surface of a substrate where a predetermined pattern is formed; detecting means for detecting electron signals at least one of reflected and secondary generated from said substrate by radiating the electron beam; means for forming an image on a display device from said signals detected by said detecting means; and means for recognizing and discriminating information about figure, roughness and voltage contrast of the surface of said substrate from said image; wherein the information of said figure is reviewed through detection of secondary electrons generated from said substrate with a first beam current of the electron beam, the information of said roughness is reviewed through detection of reflected electrons generated from said substrate, and the information of said voltage contrast is reviewed through detection of secondary electrons having a predetermined energy by charging the surface of said substrate with a second beam current having a higher beam current than a beam current of said first beam current.