Patent ID: 7495780
Filing Date: 2009-02-24
Classification: G03F

Abstract:
1. An exposure apparatus that performs a relative alignment between a reticle and a substrate and exposes a pattern of the reticle onto the substrate, the exposure apparatus comprising: a movable stage that carries one of the reticle and the substrate; and a position measurement apparatus that measures a position of at least one of the reticle and the substrate, the position measurement apparatus including, an illumination unit configured to emit light toward a mark that indicates the position of the reticle or the substrate; a light intensity measurement unit configured to measure an intensity of the light; an imaging unit configured to capture an image of the mark; a stage position measurement unit configured to measure a position of the stage; and a signal waveform correction unit configured to correct a signal waveform output from the imaging unit based on a change in stage position and a change in illumination light intensity during a period of time the imaging unit captures the image of the mark.