Patent ID: 6137111
Filing Date: 2000-10-24
Classification: B82Y,G03F,H01J

Abstract:
A device for charged-particle-beam exposure equipped with at least two exposure columns, each of which passes a charged-particle beam through an aperture formed through a mask to shape a cross section of said charged-particle beam before exposing said charged-particle beam onto an object, said device comprising:masks having the same aperture, said masks being mounted to said at least two exposure columns;a mark provided on a surface substantially at the same height as said object in each of said at least two exposure columns;a deflector, provided in each of-said at least two exposure columns, for scanning said charged-particle beam over said mark on said surface after passing said charged-particle beam through said same aperture;a detector, provided in each of said at least two exposure columns, for detecting charged particles scattered by said mark;a memory storing a signal waveform from said detector; anda comparison unit comparing said signal waveform between said at least two exposure columns in order to detect deficiency of said same aperture.