Patent ID: 6788393
Filing Date: 2004-09-07
Classification: G03B,G03F

Abstract:
A stage unit comprising:a first stage which moves two dimensionally with a substrate holding member holding a substrate mounted, and a second stage which is provided separately from said first stage; at least a first fiducial mark and a second fiducial mark provided on each of said first stage and said second stage for use in a predetermined measurement sequence, said first fiducial mark and said second fiducial mark both used in said predetermined measurement sequence; and first and second fiducial mark plates, wherein said first fiducial mark is provided on said first fiducial mark plate on both of said first and said second stages, and said second fiducial mark is provided on said second fiducial mark plate on both of said first and second stages, a position of said second fiducial mark plate being different from a position of said first fiducial mark plate on the respective stages.