Patent ID: 7175940
Filing Date: 2007-02-13
Classification: G03F

Abstract:
1. A method of generating a calibration model, said method comprising the steps of: defining a set of calibration patterns, said calibration patterns being represented in a data format; printing said calibration patterns on a substrate utilizing an imaging system; determining a first set of contour patterns corresponding to said calibration patterns imaged on said substrate, which includes a determination of a positional offset of said first set of contour patterns relative to said calibration patterns and compensating for said positional offset; generating a system pseudo-intensity function, said system pseudo-intensity function approximating the imaging performance of said imaging system; determining a second set of contour patterns by utilizing said system pseudo-intensity function to define how said calibration patterns will be imaged in said substrate; comparing said first set of contour patterns and said second set of contour patterns to determine the difference between said first set of contour patterns and said second set of contour patterns; and adjusting said system pseudo-intensity function until said difference between said first set of contour patterns and said second set of contour patterns is below a predefined error tolerance.