Patent ID: 6967719
Filing Date: 2005-11-22
Classification: G03F

Abstract:
1. A method for inspecting an exposure apparatus, comprising: illuminating a mask at least once, said mask being a mask in which a mask-pattern including at least a set of a first mask-pattern and a second mask-pattern mutually different in shape is formed, said mask being illuminated from a direction in which a point located off an optical axis of an exposure apparatus is a center of illumination, using an asymmetric illumination light to the optical axis, and exposing and projecting an image of said mask-pattern toward an image-receiving element, said asymmetric illumination light having a single chief ray incidence direction; and measuring a mutual relative distance between images of said first and second mask-patterns exposed and projected on said image-receiving element, thereby inspecting a state of an optical system of said exposure apparatus.