Patent ID: 9715993
Date: 2017-07-25
CPC Classifications: H01J

Claim:
1. A multi charged particle beam writing apparatus comprising: a stage configured to mount a target object thereon and to be continuously movable; an emitter configured to emit a charged particle beam; a multi-beam forming plate, in which a plurality of openings are formed, configured to form multi-beams by letting a region including a whole of the plurality of openings be irradiated with the charged particle beam and letting portions of the charged particle beam individually pass through a corresponding opening of the plurality of openings; a blanking array plate in which there are arranged a plurality of blankers configured to individually perform blanking deflection for a corresponding beam of the multi-beams having passed through the plurality of openings of the multi-beam forming member; a limiting aperture plate configured to block each beam having been deflected to be in an “off” state by at least one of the plurality of blankers; a deflector configured to perform collective deflection of each beam in an “on” state having passed through the limiting aperture member; an obtaining processing circuitry configured to obtain a deviation amount of an irradiation position of each beam of the multi-beams depending on a deflection amount of the multi-beams; a correction coefficient calculation processing circuitry configured to calculate a correction coefficient for correcting the deviation amount of the irradiation position, for each beam and for each irradiation position; a shot data generation processing circuitry configured to generate shot data in which the irradiation position of the each beam of the multi-beams is corrected by using the correction coefficient, for each deflection shift cycle in a case where writing processing is performed while repeating a deflection shift cycle with treating continuous deflection shifts of the multi-beams performed a plurality of times as one deflection shift cycle; and a deflection control processing circuitry configured to control the plurality of blankers, based on the shot data.