Patent ID: 7704645

Claim:
A method of generating writing pattern data of a reflective mask for use in a non-telecentric reflective exposure tool, comprising: obtaining a vertical position profile by measuring vertical positions of a plurality of X, Y coordinates arbitrarily set on the surface of a blank mask substrate when mounted on a mask stage of the reflective exposure tool, or by measuring and calculating a flatness profile of the surface of the blank mask; calculating unevenness and a local curved surface gradient of the blank mask substrate surface from the vertical position profile; calculating a shift amount of an image position of a pattern corresponding to the writing pattern data which is transferred by the reflective exposure tool, generated in a wafer substrate to be processed, mounted on a wafer stage of the reflective exposure tool, in accordance with the unevenness and local curved surface gradient of the blank mask substrate and parameters of a non-telecentric optics of the reflective exposure tool; and obtaining first corrected writing pattern data by correcting design pattern data of the reflective mask based on the shift amount of the image position and a reduction ratio of a projection optics of the reflective exposure tool.