Patent ID: 9691585
Date: 2017-06-27
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 emission unit configured to emit a charged particle beam; an aperture member, in which a plurality of openings are formed, configured to form multiple 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 respectively pass through a corresponding opening of the plurality of openings; a blanking plate in which there are arranged a plurality of blankers configured to respectively perform blanking deflection for a corresponding beam of the multiple beams having passed through the plurality of openings of the aperture member; a blanking aperture member configured to block each beam having been deflected to be in an “off” state by at least one of the plurality of blankers; a first deflector configured to collectively deflect each beam in an “on” state having passed through the blanking aperture member to a writing position of the each beam; a second deflector configured to collectively deflect the each beam in the “on” state having passed through the blanking aperture member in such a way as to follow a movement of the stage; and a deflection control unit configured to control the first deflector to deflect the each beam to a corresponding writing position, and after a writing time has passed, to deflect the each beam to be shifted to a next corresponding writing position, and to control the second deflector to continue tracking of the each beam without shifting a beam deflection for tracking control while the each beam irradiates the writing position and while the each beam irradiates the writing position which has been shifted at least once, and after the each beam irradiates the writing position which has been shifted at least once, to return a tracking position such that a next tracking start position is a former tracking start position where the tracking control was started, by resetting the beam deflection for the tracking control, wherein the writing position is an irradiation region which can be irradiated by one-shot of the each beam, wherein a tracking distance in a direction of tracking from starting tracking control to resetting beam deflection of the tracking control is smaller than a size of the irradiation region which can be irradiated by one-shot.