Patent ID: 8431908

Claim:
A charged particle beam writing apparatus comprising: an emission unit configured to emit a charged particle beam; a stage on which a substrate serving as a writing target is placed and which is movable; a plurality of tracking calculation units each configured to calculate a deflection amount of the charged particle beam, for following movement of the stage, while having a calculation time difference wherein there exists a mutual overlapping time period; a switching unit configured, for each small region of a plurality of small regions made by virtually dividing a surface of the substrate, to input an end signal indicating that emission of the charged particle beam to a small region concerned has been completed, and to switch, using the end signal as a trigger, from output of one of the plurality of tracking deflection amount calculation units to output of another of the plurality of tracking deflection amount calculation units; and a deflector configured, while the stage is moving, to deflect the charged particle beam to an n-th small region, based on a signal output from one of the plurality of tracking deflection amount calculation units before switching the plurality of tracking deflection amount calculation units, and to deflect the charged particle beam to an (n+1)th small region, based on a signal output from another of the plurality of tracking deflection amount calculation units after switching the plurality of tracking calculation units.