Patent ID: 9348235
Filing Date: 2016-05-24
CPC Classification: G03F

Claim Text:
1. An exposure apparatus which projects an image of a pattern formed on a mask onto a substrate through a projection optical system, the apparatus comprising: a prediction unit configured to predict an imaging characteristic fluctuation of the projection optical system which is caused by thermal action due to exposure, by using a model formula modeling the imaging characteristic fluctuation; and a correction unit configured to correct the imaging characteristic based on a prediction result obtained by the prediction unit, wherein the model formula comprises a composition of a plurality of functions modeling the imaging characteristic fluctuation and indicating a time dependency, each of the plurality of functions having an exposure-angle-of-view dependency which represents a dependency of an illumination size, a size of an imaging plane at the wafer level or a mask area, and the exposure-angle-of-view dependencies of the plurality of functions being different from each other.