Patent ID: 8797501

Claim:
An exposure apparatus which projects a pattern of an original onto a substrate by a projection optical system within a chamber to expose the substrate, comprising: a measurement unit configured to perform measurement to calculate a deformation amount of the original; and a controller configured to calculate a predicted deformation amount βre of the original and to correct a projection magnification of the projection optical system so as to correct the predicted deformation amount, based on (a) a function βr(t) which indicates the deformation amount of the original with reference to a shape of the original at a certain temperature, the function βr(t) being a function of a time t during which the original receives exposure light, (b) a deformation amount βr 0 of the original before exposure, at a temperature which is not the certain temperature, the deformation amount βr 0 being determined based on a measurement value obtained by measuring, by the measurement unit, the original which is loaded into the chamber and unused for exposure, and (c) the time t, wherein the controller calculates the predicted deformation amount βre of the original in accordance with the equation βre=βr(t+t 0 ), and wherein t 0 is a time until the value of the function βr(t) reaches the deformation amount βr 0 .