Patent ID: 8247783

Claim:
A method of determining a main deflection settling time for a charged particle beam writing apparatus, comprising: writing a pattern using a first deflection settling time in each of a plurality of sub-deflection regions by moving the charged particle beam to the sub-deflection region to be written, from an adjacent sub-deflection region; writing a pattern using a second deflection settling time in each of a plurality of sub-deflection regions by moving the charged particle beam to the sub-deflection region to be written, from an adjacent sub-deflection region; measuring positions of the patterns written by using the first deflection settling time by a position measuring unit; determining each amount of displacement of the patterns written by using the first deflection settling time from their positions; measuring positions of the patterns written by using the second deflection settling time by the position measuring unit; determining each amount of displacement of the pattern written by using the second deflection settling time from their positions; calculating an average amount of displacement based on the displacements of the first deflection settling time; calculating an average amount of displacement based on the displacements of the second deflection settling time; and determining the main deflection settling time based on these average amounts of displacement.