Patent ID: 6525817
Filing Date: 2003-02-25
Classification: G03F

Abstract:
A projection exposure apparatus to project a pattern formed on a mask onto a sensitive substrate through a projection optical system by synchronously scanning said sensitive substrate and said mask in a predetermined scanning direction, comprising:a mask stage movable in said scanning direction while holding said mask; a reference mark member having a plurality of reference marks and being disposed on said stage and arranged within an approach run section of said mask stage, wherein said approach run section is illuminated with an illumination light for exposure light at the time of acceleration or deceleration moving of said stage; an image position detector to detect a position of a projection image of at least one of said plurality of reference marks obtained through said projection optical system under illumination light having the same wavelength band as the illumination light for exposure; a calculator to obtain an image formation characteristic of said projection optical system, based on the result of the detection of said image position detector; and an adjuster to adjust the image formation characteristic of said projection optical system, based on the image formation characteristic obtained by said calculator.