Patent ID: 7619230

Claim:
A charged particle beam writing method comprising: inputting pattern data for writing a writing region; predicting a writing time for writing the pattern of the pattern data; acquiring a first base dose of a charged particle beam at a writing start; acquiring a second base dose of the charged particle beam after a time interval from the writing start, in the case in which the pattern is written, using a correlation among a time required from a writing start time, the predicted writing time and the first base dose of the charged particle beam; acquiring a first proximity effect correction coefficient at the writing start; acquiring a second proximity effect correction coefficient after a time interval from the writing start, in the case in which the pattern is written, using a correlation among the time required from the writing start time, the predicted writing time and the first proximity effect correction coefficient; calculating an exposure dose of the charged particle beam after the time interval from a writing start in the writing time using the second base dose and the second proximity effect correction coefficient; and writing an instant writing position in the writing region by using the charged particle beam corresponding to the exposure dose, wherein the correlation between the time required from the writing start time and the first base dose is obtained based on a relationship between a leaving time after writing and a pattern line width changed by the leaving time and a relationship between the pattern line width and the first base dose.