Patent ID: 7466412
Filing Date: 2008-12-16
Classification: G03F

Abstract:
1. A method of detecting a displacement of exposure position marks that detects exposure position marks formed on a work in a former process and a latter process and detects a displacement of an exposure position from a displacement of the exposure position marks, wherein the exposure position marks are constructed of a first pattern made up of an inner quadrangular pattern and an outer quadrangular pattern and a second pattern shaped as a rectangular frame whose inner edge and outer edge are formed as quadrangular patterns, in the former process and the latter process, one of the first pattern and the second pattern is formed to make center positions of the first pattern and the second pattern match and have the second pattern disposed inside a region between an inner quadrangular pattern and an outer quadrangular pattern of the first pattern, and the displacement of the exposure position is determined, based on a result of detecting images of the exposure position marks, by calculating an average of a measurement produced by detecting a displacement between the center positions of the inner quadrangular pattern of the first pattern and the quadrangular pattern that is the inner edge of the second pattern and a measurement produced by detecting a displacement between the center positions of the outer quadrangular pattern of the first pattern and the quadrangular pattern that is the outer edge of the second pattern.