Patent ID: 7881520
Filing Date: 2011-02-01
Classification: G01N,G03F,H01L

Abstract:
1. A defect inspection system comprising: first accumulating means for accumulating an inspection image including a defect and a reference image corresponding thereto in association with an inspection condition; second accumulating means for digitalizing, as a defect signal intensity, an absolute value of a pixel having a maximum absolute value among respective pixels of a difference image between the inspection image and the reference image to accumulate the defect signal intensity in association with the inspection condition; control means for changing the inspection condition to repeatedly execute accumulation performed by the first accumulating means and accumulation performed by the second accumulating means for evaluations until evaluations of all inspection conditions in a set range are completed; recipe file producing means for using information accumulated in the first accumulating means and the second accumulating means to automatically output a recipe file including the inspection condition having a highest defect signal intensity as an inspection condition recipe; and defect detecting means for using the reference image and the inspection image obtained by imaging areas corresponding to two patterns on a substrate to detect a pattern defect or a foreign material defect based on the recipe file produced by the recipe file producing means, wherein the inspection image accumulated in the first accumulating means and the reference image are images obtained by producing a simulation model based on a structural drawing of a substrate to be inspected and calculating a case where a defect is present and a case where no defect is present according to the simulation model.