Patent ID: 6721039
Filing Date: 2004-04-13
Classification: G03B,G03F

Abstract:
An exposure method which illuminates a first object with an exposure beam emitted from a light source and exposes a second object through a projection system with the exposure beam that has passed through a pattern on the first object, comprising:obtaining a correlation between a light amount of the exposure beam detected at a measuring point on an optical path between the light source and the first object and a light amount of the exposure beam on an image plane of the projection system; obtaining, for each exposure process condition for exposing the second object, control parameters for forecasting a variation amount of a transmittance of an optical system disposed between the measuring point and the second object; forecasting the variation amount of the transmittance of the optical system in accordance with the obtained control parameters; and renewing the correlation based on the forecasted variation amount of the transmittance.