Patent ID: 7826044
Filing Date: 2010-11-02
Classification: G01M,G03F

Abstract:
1. A measurement apparatus for measuring an optical characteristic of a target optical system, said measurement apparatus comprising: a patterned member that has a plurality of patterns that reduce diffracted lights other than a predetermined order; and a pinhole member that has a plurality of pinholes, wherein the patterned member and the pinhole member are formed on front and back surfaces of a same substrate, wherein a center position of a first pattern among the plurality of patterns is shifted from a center position of a corresponding pinhole that is formed in the pinhole member and that faces the first pattern, and a center position of a second pattern among the plurality of patterns is shifted from a center position of a corresponding pinhole that is formed in the pinhole member and that faces the second pattern, and wherein a shift amount between the center position of the second pattern and the center position of the corresponding pinhole facing the second pattern is different from a shift amount between the center position of the first pattern and the center position of the corresponding pinhole facing the second pattern.