Patent ID: 6222195
Filing Date: 2001-04-24
Classification: B82Y,G03F,H01J

Abstract:
A method of exposing a beam image onto an object after passing a charged-particle beam through a first slit and a second slit successively to form said beam image as a superimposition of said first slit and said second slit, said method comprising the steps of:a) scanning said beam image in at least one scan direction over a mark provided on one of said object and a proximity of said object;b) detecting a signal of charged particles scattered by said mark when said mark is scanned;c) detecting, based on said signal, displacement, rotation, and distortion of an image which said first slit projects onto said second slit;d) correcting said beam image based on information about said displacement, rotation, and distortion; ande) exposing said beam image after the correction onto said object.