Patent ID: 7820362

Claim:
A method of writing a desired pattern by preparing a material on which a photosensitive material is applied and irradiating the photosensitive material with a charged-particle beam, said method comprising the steps of: dividing a pattern to be delineated into pattern segments according to first fields by a first method of division; dividing the pattern segments contained in the first fields in a first direction to obtain first sets of pattern subsegment data; dividing the pattern to be delineated according to second fields by a second method of division such that the second fields are shifted with respect to the first fields; dividing pattern segments contained in the second fields in a second direction perpendicular to the first direction to obtain second sets of pattern subsegment data; and delineating the pattern subsegments based on the first and second sets of pattern subsegment data with a dose that is a half of a dose with which the photosensitive material is normally exposed, wherein the fields are so divided that a pattern segment located across a field boundary during implementation of one of the first and second methods of division is located around the center of a field during implementation of the other method of division.