Patent ID: 6710848
Filing Date: 2004-03-23
Classification: G03F

Abstract:
A projection exposure apparatus for projecting a pattern image formed on a mask onto a photosensitive substrate through a projection optical system to form a projected image thereon, the projection exposure apparatus comprising:a substrate position detector that detects a position of a registration mark formed on the substrate; an imagery characteristic correction mechanism coupled with the projection optical system that drives the projection optical system to correct an imagery characteristic of the projection optical system; an image-forming displacement detector communicating with said imagery characteristic correction mechanism, said image-forming displacement detector determining a displacement amount of an image-forming position of the projected image in accordance with a driven amount of the projection optical system by said imagery characteristic correction mechanism; and an alignment signal processor communicating with said substrate position detector and said image-forming displacement detector, said alignment signal processor correcting the detection result of the substrate position detector based on the displacement amount of the image-forming position obtained by the image-forming displacement detector.