Patent ID: 6750950
Filing Date: 2004-06-15
Classification: G03F

Abstract:
A scanning exposure method for transferring a pattern formed on a mask to a divided area on a substrate through a projection optical system, and synchronously moving said mask and said substrate with respect to an illumination light along a synchronous moving direction of said substrate, said scanning exposure method comprising the steps of:determining a spatial frequency distribution of the divided area along said synchronous moving direction of said substrate; deciding to use either a first focusing control mode providing substrate tilt changing control or a second focusing control mode maintaining substrate tilt unchanged as a decided mode when said pattern is transferred onto the divided area depending on the spatial frequency distribution of the divided area determined by the determining step and a width of an illumination area on the substrate in the synchronous moving direction; and transferring the pattern formed on the mask onto the divided area while performing said focusing control in the decided mode.