Patent ID: 6894782
Filing Date: 2005-05-17
Classification: G03F

Abstract:
1. A method of measuring defocusing, comprising the steps of: applying a resist to the top surface of a semiconductor wafer; subjecting the resist to exposure to light, wherein the exposure is carried out by deviating a focus of the light by a given distance away from the resist, in a direction perpendicular to the top surface of the semiconductor wafer, and by using a mask patterned with a geometrical figure comprising a plurality of small rectangles, each narrower in width than a resolution limit of a pattern exposure system, provided on four sides of a large rectangle, and arranged so as to be perpendicular longitudinally or parallel transversely to the respective four sides of the large rectangle; forming a resist pattern by developing the resist after the step of subjecting the resist to the exposure to light; and finding defocusing in relation to the resist on the basis of a length of the resist pattern.