Patent ID: 8625074
Filing Date: 2014-01-07
Classification: G03B,G03F

Abstract:
1. An exposure apparatus comprising: a projection optical system configured to project a pattern of a reticle located on an object plane onto a substrate located on an image plane; a phase shift type mark mounted on a stage which holds the substrate and having a step structure; an image sensor which is set at one of a position of the object plane and a position optically conjugate to the object plane, and is configured to capture an image of the phase shift type mark via the projection optical system; a measurement unit configured to measure an interval between an edge image formed by one side edge portion of the step structure and an edge image formed by another side edge portion of the step structure, in the image of the phase shift type mark captured by the image sensor; and a controller configured to control a position of the stage in a direction of an optical axis of the projection optical system based on the measured interval.