Patent ID: 7388216

Claim:
A pattern writing apparatus for radiating an energy beam on a resist that is applied to a target to write patterns thereon comprising: a memory configured to store pattern data for writing the patterns, the pattern data including a reference radiation amount D 0 for radiating the energy beam, a distribution of a pattern dependency of a pattern-size variation Δ due to a loading effect, and an energy distribution “s” applied to the resist by the energy beam; a first calculator configured to divide writing regions of the target into grids to provide sub-writing regions in the grids and configured to obtain a distribution of a pattern-area density per sub-writing region based on the pattern data; a second calculator configured to calculate a radiation amount DC f (x) for correcting a long-range fogging exposure in each sub-writing region based on the pattern-area density and the reference radiation amount D 0 ; a third calculator configured to calculate a radiation amount DC p (x) for correcting a proximity effect applied to those of the patterns in each sub-writing region based on the pattern data and the reference radiation amount D 0 ; a fourth calculator configured to calculate a radiation amount D(x) based on the radiation amount DC f (x) the radiation amount DC p (x), the distribution of a pattern dependency, and the energy distribution “s”; a deciding portion configured to decide radiation locations and a radiation shape of the energy beam based on data on a pattern location and a pattern shape for each of the patterns in the sub-writing regions; and a radiating portion configured to radiate the energy beam on the radiation location on the target with the radiation shape for a period in which a radiated energy level from the energy beam reaches the radiation amount D(x).