Patent ID: 7336352
Filing Date: 2008-02-26
Classification: G03F,G06K,G06T

Abstract:
1. An exposure apparatus for exposing a substrate to a pattern, said apparatus detecting a position of a target mark out of a plurality of marks, disposed with respect to each shot of the substrate to obtain a position of a shot, said apparatus comprising: a stage configured to mount the substrate and to be moved; a scope configured to sense an image of the substrate at a first magnification and an image of the substrate at a second magnification higher than the first magnification; a processor configured to extract, from an image sensed by said scope at the first magnification, a position of a first mark out of the plurality of marks and a feature of a region outside the first mark, to identify the first mark based on the extracted feature, to extract, from an image sensed by said scope at the second magnification, a position of the target mark, to evaluate reliability of the extracted position of the target mark, to select a second mark, instead of the target mark, from the plurality of marks as a new target mark based on the identified first mark, if the evaluated reliability is less than a threshold, and to extract a position of the selected second mark from an image sensed by said scope at the second magnification; and a controller configured to control a position of said stage based on the extracted position of the second mark.