Patent ID: 6294297
Filing Date: 2001-09-25
Classification: G03F

Abstract:
A computer program product for calculating a process tolerance which, in order to obtain a process tolerance in a process for forming a pattern on an object, to be processed, with the use of a projection light exposure apparatus, calculates a process tolerance for finding a relation of a light exposure amount and focal point position corresponding to a finished pattern of an allowable dimension value by a computer system, comprising:a memory medium; andfirst, second, third, fourth and fifth instruction means operated by the computer system, whereinthe first instruction means measures a variation in pattern dimension in terms of its length on the basis of a variation in light exposure amount by the projection light exposure apparatus and in focal point position;the second instruction means finds a dependence of a pattern dimension upon the light exposure amount, at each varying focal point position, through a curve approximation;the third instruction means finds a dependence of a pattern dimension upon the focal point position, at each varying light exposure amount, on the basis of a result obtained by the second instruction means;the fourth instruction means finds a light exposure amount corresponding to a finished pattern of an allowable dimension value at each focal point position; andthe fifth instruction means finds a dependence of the focal point position upon a light exposure amount corresponding to the finished pattern of an allowable dimension value from a result of the fourth instruction means.