Patent ID: 6057907
Filing Date: 2000-05-02
Classification: B82Y,H01J,Y10S

Abstract:
A system for exposing a pattern on an object using a charged particle beam, said system comprising:a blanking aperture array mask having a substrate, an aperture array on said substrate and a pair of electrodes on said substrate for each aperture, said blanking aperture array being positioned in a path of said charged particle beam;a charged particle beam radiating apparatus for making a multibeam by projecting said charged particle beam on to said blanking aperture array mask;a multibeam controller for selectively providing a voltage between each of said pairs of electrodes based upon pattern bitmap data to selectively radiate said charged particle beam passed through said apertures on said object;a deflector for deflecting said multibeam;a first checksum calculator for counting a total bit number of one of ""1's"" and ""0's"" in said bitmap data within a band area as a first checksum before said bitmap data is supplied to said multibeam controller, said band area being for continuously scanning said charged particle multibeam on said object;a second checksum calculator for obtaining a second checksum of said bitmap data within said band area before said bitmap data is supplied to said multibeam controller, said second checksum corresponding to said first checksum; anda comparator for comparing said first checksum against said second checksum.