Patent ID: 6018395
Filing Date: 2000-01-25
Classification: G03F

Abstract:
An alignment method usable with an original having a pattern and a substrate having a surface area on which the pattern of the original is to be printed, said alignment method comprising the steps of:detecting, by mark detecting means, plural marks provided in relation to the surface area of the substrate, prior to the printing of the pattern of the original on the surface area of the substrate;calculating, plural times, the amount of rotational deviation between the original and the substrate with respect to the surface area of the substrate, on the basis of different combinations of pieces of the mark detection information as outputted from the mark detecting means;weighting the obtained rotational deviation amounts on the basis of respective precisions of different pieces of the mark detection information, and calculating the quantity of rotational correction to the original and the substrate by using the weighted rotational deviation amounts; andaligning the original and the substrate on the basis of the calculated quantity of rotational correction.