Patent ID: 6337733
Filing Date: 2002-01-08
Classification: G03F,Y10T

Abstract:
An apparatus for exposing a photosensitive substrate with an image of a pattern on a mask, comprising:a stage that moves said mask or said substrate; a driving device that is connected with said stage and includes a coil assembly and a magnet member that comprises a plurality of magnets at a predetermined polar pitch in a first direction, said driving device driving said stage with a supply of exciting currents of a plurality of different phases to said coil assembly; a laser interferometer that detects the position of said stage; and a device that is connected with said coil assembly and said laser interferometer, said device obtaining a relationship between an output of the laser interferometer and a positional relation of the magnet member with the coil assembly in an initial setting operation, determining positional information between said coil assembly and said magnet member based on the obtained relationship, the output of said laser interferometer and the predetermined polar pitch, and determining the phase of at least one of said exciting currents to be supplied to said coil assembly by using said positional information.