Patent ID: 8248580
Filing Date: 2012-08-21
Classification: G01J,G03B,G03F

Abstract:
1. A scanning exposure apparatus comprising: a first stage which holds a reticle; a second stage which holds a substrate; a projection optical system which projects a pattern of the reticle onto the substrate; a plurality of first measurement units arranged on said second stage; and a controller, wherein a measurement mask is arranged on said first stage, each of said plurality of first measurement units includes a light-shielding member having an opening, and a photoelectric conversion element which receives light having passed through said opening, and measures, by said photoelectric conversion element, an intensity of light having passed through said opening in a light intensity distribution formed on said light-shielding member when at least one of said first stage and said second stage is scanned and a measurement pattern of the measurement mask is obliquely illuminated, and said controller calculates a defocus amount, while at least one of said first stage and said second stage is scanned, and a direction of defocus between the reticle and the substrate, based on a temporal change in a difference between a plurality of the light intensities measured by said plurality of first measurement units.