Patent ID: 6236447
Filing Date: 2001-05-22
Classification: G03F

Abstract:
An exposure method for exposing a surface to be exposed via a projection optical system after a substrate moves stepwise in a direction perpendicular to an optical axis of the projection optical system to feed to a predetermined exposure position a plurality of shots on the substrates, in turn, in which at least one of a position and tilt of the surface to be exposed of a fed shot to be exposed in the direction of the optical axis is measured during the stepwise movement, and the surface to be exposed is brought to a position of a focal plane of the projection optical system on the basis of a measurement value, said method comprising:a step of obtaining, in advance, a focus offset as a measurement error resulting from different measurement points for the measurement during the stepwise movement and a deformation of a main body structure, in each shot; anda step of bringing the surface to be exposed for the shot to be exposed to the position of the focal plane on the basis of a correction result of the measurement, in each shot to be exposed, using the focus offset, in an exposure sequence.