Patent ID: 6856931
Filing Date: 2005-02-15
Classification: G03F

Abstract:
1. A mark detection method with which to detect a mark formed on an object, comprising: measuring a surface state of an area of said object including, in a predetermined direction, a mark-formed area where said mark is formed and a no-mark area formed on the outside in said predetermined direction of said mark-formed area, said no-mark area having a characteristic compared to other areas; and extracting, while running a window having a dimension substantially coincident with said no-mark area in a signal process relatively to a signal measured in said measuring and obtaining at least one quantity denoting the surface state of an area in said window moving across said no-mark area having a characteristic based on measurement results through said window in said measuring, an area having a measurement result reflecting said mark based on said at least one quantity varying with position of said window.