Patent ID: 9727980
Date: 2017-08-08
CPC Classifications: G01R,G03F,G06T,H01L

Claim:
1. An inspection method comprising: placing a sample, in which a plurality of graphic patterns are arranged, on a stage of an inspection apparatus; dividing an inspection region of the sample into a plurality of stripe regions, and dividing the inspection region into a plurality of groups so that a plurality of continuously arranged stripe regions constitutes one group; acquiring optical images of graphic patterns arranged in all stripe regions while measuring position coordinates of the stage using a laser interferometer, wherein the step for acquiring optical images comprises obtaining the position coordinates of the graphic pattern from a measurement value of the position coordinates of the stage, the optical image of the graphic pattern, and a reference image generated from design data of the graphic pattern, obtaining a misplacement amount between the optical image and the reference image based on the position coordinates of the graphic pattern, and obtaining first misplacement information of a relationship between the misplacement amount and an acquiring order of the optical images; obtaining second misplacement information that is an approximate curve of the first misplacement information; obtaining third misplacement information that is a difference between the first misplacement information and the second misplacement information; and obtaining fourth misplacement information of a relationship between a misplacement amount in the third misplacement information and design position coordinates obtained from the design data.