Patent ID: 6563565
Filing Date: 2003-05-13
Classification: G03B,G03F

Abstract:
A projection exposure apparatus comprising:an illumination optical system which emits an energy beam and illuminates a pattern formed on a mask; a projection optical system which projects an image of said pattern onto a substrate; a substrate stage disposed at a side of an image plane of said projection optical system to position said substrate; a beam energy measuring system which measures energy of said energy beam input in said projection optical system; a referencing member which is disposed on said substrate stage having at least one reference mark to correspond with at least one alignment mark formed on said mask; an alignment sensor which detects a positional deviation between the alignment mark on said mask and said reference mark under illumination by said energy beam; a detector device which detects energy of said energy beam which has passed through said projection optical system when said reference mark is illuminated by said energy beam; and a computation system connected to said beam energy measuring system and to said detector device to compute a transmission coefficient of said projection optical system, according to a result output from said beam energy measuring system and a detection result output from said detector device.