Patent ID: 6169602
Filing Date: 2001-01-02
Classification: G03F

Abstract:
An inspection method of a projection optical system for projecting an image of a predetermined pattern formed on a mask onto a predetermined plane, comprising the steps of: (1) moving said predetermined pattern formed on said mask to a first position; (2) moving said predetermined pattern to a second position different from said first position perpendicularly with respect to an optical axis of said projection optical system; (3) detecting a positional relationship between said first position and said second position; (4) detecting a positional relationship between a position where said image of said predetermined pattern in said first position is projected by said projection optical system and a position where said image of said predetermined pattern in said second position is projected by said projection optical system; and (5) obtaining an image formation characteristic of said projection optical system, based on said positional relationship detected in said step (3) and said positional relationship detected in said step (4).