Patent ID: 8861832
Filing Date: 2014-10-14
Classification: G06T

Abstract:
1. An inspection system comprising: a stage having a region for placing a sample thereon which has an inspection region virtually divided by a plurality of stripes; a position error correcting unit, which is disposed on the stage in a region different from the region for placing the sample, configured to have patterns virtually divided corresponding to the plurality of stripes; an optical image acquiring unit configured to irradiate light onto the inspection region of the sample and onto the position error correcting unit, thereby obtaining optical images; a reference image producing unit configured to generate reference images from design data of the sample; a comparing unit configured to compare the optical images of the sample and the reference images of the sample, and determine that a different value is defective when the difference value by comparison with the optical image and the reference image exceeds a predetermined threshold; a fluctuation value acquiring unit configured to acquire fluctuation values of position coordinates of the patterns formed on the position error correcting unit from both the optical image of the position error correcting unit and the reference image of the position error correcting unit; and a fluctuation value correcting unit configured to obtain, based upon the fluctuation values, fluctuation values of position coordinates of respective patterns on the inspection region of the sample to be inspected, and to correct the position coordinates of the respective patterns.