Patent ID: 7834978
Filing Date: 2010-11-16
Classification: G03F

Abstract:
1. An exposure apparatus for transferring a pattern formed on a mask onto a substrate, said apparatus comprising: a projection optical system configured to project an image of the pattern formed on the mask onto the substrate; a substrate stage which includes a reference mark, and is configured to hold the substrate and to move; a position measurement system configured to measure a position of the substrate stage; a through-the-lens scope configured to detect positional information of the reference mark through the projection optical system; an off-axis scope configured to detect positional information of the reference mark without using the projection optical system; and a controller configured to control a position of the substrate stage and an operation of the through-the-lens scope and the off-axis scope, and to execute measurement of a relative positional relationship between the through-the-lens scope and the off-axis scope based on the positional information detected by the through-the-lens scope and the positional information detected by the off-axis scope, wherein the controller executes a detection of the positional information by the through-the-lens scope and a detection of the positional information by the off-axis scope at respective frequencies different from each other, based on an air pressure variation or an elapsed exposure time.