Patent ID: 6335784
Filing Date: 2002-01-01
Classification: G03F

Abstract:
A scan type exposure apparatus, comprising:a first movable stage on which a first object is to be placed; a second movable stage on which a second object is to be placed; a projection optical system for projecting a pattern of the first object onto the second object; a scanning mechanism for scanningly moving said first and second movable stages in a timed relation with each other, relative to said projection optical system, while the pattern of the first object is projected by said projection optical system onto the second object; storing means for storing therein data corresponding to a change in an exposure condition, wherein the change in the exposure condition is a periodic change produced in response to a scan motion of at least one of the first and second stages and in accordance with a scan acceleration or a scan speed, and the data is measured beforehand by observing a projected image of a pattern of the first object, being formed on the second object through a projection optical system and by use of exposure light, while scanningly moving at least one of the first and second stages; and control means for controlling drive of said first and second movable stages in an actual exposure process, while reflecting a correction value, as determined on the basis of the data stored, to the drive of at least one of said first and second movable stages, wherein the correction value is determined with respect to plural accelerations or speeds of at least one of said first and second movable stages, and the correction value is set variably in accordance with the accelerations or speeds and with directions of the accelerations or speeds.