Patent ID: 7608845
Filing Date: 2009-10-27
Classification: B82Y,H01J,Y10S

Abstract:
1. A charged particle beam writing apparatus comprising: a writing time estimation calculating part configured, based on pattern data to be written in a writing region, to estimate a total writing time for writing a pattern based on the pattern data with a charged particle beam; a base dose acquiring part configured to acquire a base dose at an arbitrary time, after writing start time and within the total writing time, in writing using the pattern data, by using a first correlation among a time having passed since the writing start time, the total writing time, and the base dose; a fogging effect correction coefficient acquiring part configured to acquire a fogging effect correction coefficient at the arbitrary time, in writing using the pattern data, by using a second correlation among the time having passed since the writing start time, the estimated total writing time and the fogging effect correction coefficient; a beam dose calculating part configured to calculate a beam dose at the arbitrary time by using the base dose and the fogging effect correction coefficient; a beam irradiation time calculating part configured to calculate a beam irradiation time of the charged particle beam at a position in the writing region, based on a calculated beam dose; a deflector configured to deflect the charged particle beam according to the beam irradiation time; and an aperture configured to block the charged particle beam deflected by the deflector.