Patent ID: 6088082
Filing Date: 2000-07-11
Classification: G03F

Abstract:
A projection aligner which projects light onto a circuit pattern on a reticle and which aligns and projects the circuit pattern onto a substrate via a projection lens assembly, said projection aligner comprising:means for generating a reticle reference data curve indicating a relationship between exposure time of the reticle and a variation in an exposure magnification of the reticle, which curve is obtained when exposure is performed under a reference exposure condition established using a parameter governing the exposure magnification of the reticle;means for generating a projection lens reference data curve indicating a relationship between exposure time of the projection lens assembly and a variation in the exposure magnification of the lens assembly, which curve is obtained when exposure is performed under a reference exposure condition established using a parameter governing the exposure magnification of the projection lens assembly;storing means for storing information related to the reticle reference data curve and for storing information related to the projection lens assembly data curve; andmagnification correcting means for correcting exposure magnification on the basis of a linear sum of the information stored in said storing means.