Patent ID: 8253931
Filing Date: 2012-08-28
Classification: G03B,G03F

Abstract:
1. An apparatus including an optical system for illuminating an original to project a pattern of the original onto a substrate, the apparatus comprising: a measurement device which includes a measurement pattern arranged on a substrate-side pattern unit and an image sensor arranged on a substrate stage that holds the substrate, and is configured to measure a characteristic of the optical system based on a light intensity distribution that is formed on an image sensing plane of the image sensor via the optical system and the measurement pattern, the substrate-side pattern unit being on a side of the substrate stage; a calibration pattern arranged on the substrate-side pattern unit; and a controller configured to correct the light intensity distribution formed by the measurement pattern and captured by the image sensor, based on a light intensity distribution formed by the calibration pattern and captured by the image sensor, and a light intensity distribution that is calculated based on data for the calibration pattern as a light intensity distribution to be formed by the calibration pattern, wherein the calibration pattern is arranged to surround a region where the measurement pattern is arranged.