Patent ID: 7170603
Filing Date: 2007-01-30
Classification: G03F

Abstract:
1. An exposure apparatus for exposing a wafer to a pattern, said apparatus comprising: a stage configured to hold the wafer and to move; a scope having an image sensor and configured to obtain image data, said image sensor being configured to store image signals corresponding to an image of a mark formed on said image sensor during an image storage period of said image sensor and to supply the stored image signals as the image data, the mark being held by said stage; a laser interferometer configured to measure a deviation of said stage, the deviation being a difference between a target position of said stage and an actual position of said stage; and a controller configured to calculate an average of a plurality of the deviations of said stage measured by said laser interferometer during the image storage period, to calculate a position of the mark based on the image data obtained by said scope and data of the calculated average, and to control a position of said stage based on the calculated position of the mark.