Patent ID: 7703066

Claim:
A method of manufacturing an exposure mask comprising: generating or preparing flatness variation data relating to a real mask blanks substrate to be processed into a real exposure mask, the flatness variation data being data relating to a change of flatness of the real mask blanks substrate caused when the real mask blanks substrate is chucked by a chuck unit of an exposure apparatus; inputting the flatness variation data into a computer to generate position correction data of a pattern to be drawn on the real mask blanks substrate based on the flatness variation data such that a mask pattern of the real exposure mask comes to a predetermined position in a state that the real exposure mask is chucked by the chuck unit; setting the real mask blanks substrate in a drawing apparatus; inputting drawing data and the position correction data into the drawing apparatus wherein the drawing data corresponds to the pattern to be drawn on the real mask blanks substrate; and drawing a pattern on the real mask blanks substrate by using the drawing apparatus, wherein the drawing apparatus draws the pattern with correcting a drawing position of the pattern based on the position correction data such that the mask pattern of the real exposure mask comes to the predetermined position in the state that the real exposure mask is chucked by the chuck unit.