Patent ID: 8492732
Filing Date: 2013-07-23
Classification: B82Y,H01J

Abstract:
1. A multi charged particle beam writing apparatus comprising: an emission unit configured to emit a charged particle beam; a first aperture member in which a plurality of openings are formed and which is configured to form multiple beams by letting a region including a whole of the plurality of openings be irradiated by the charged particle beam and letting parts of the charged particle beam pass through a corresponding opening of the plurality of openings respectively; a blanker array configured to be provided with a plurality of blankers which perform blanking deflection of a corresponding beam respectively in multiple beams having passed through the plurality of openings of the first aperture member; a first electromagnetic lens and a second electromagnetic lens arranged between the first aperture member and the blanker array; a second aperture member arranged between the first electromagnetic lens and the second electromagnetic lens and at a position of a convergence point of the multiple beams, and configured to restrict passage of charged particles deviated from the convergence point; and a third aperture member configured to block each beam of the multiple beams which was deflected to be in a beam off state by the plurality of blankers.