Patent ID: 7339663
Filing Date: 2008-03-04
Classification: G01N

Abstract:
1. A method for classifying repetitive defects on a substrate, comprising: providing a die-comparing unit for sequentially comparing the dies on the substrate with a predetermined reference die; providing a coordinate-marking unit for marking sets of coordinates on the reference die which correspond to the position of the defects on the dies on the substrate; providing a repetitive defect-classifying unit for classifying as repetitive defects, defects corresponding to coordinates which are repeatedly marked in a reference region provided on the reference die: sequentially comparing, using said die-comparing unit, the dies on the substrate with a predetermined reference die; marking sets of coordinates with said coordinate-marking unit on the reference die which correspond to the position of the defects on the dies on the substrate; and repetitively classifying with said defect-classifying unit, as repetitive defects, defects corresponding to coordinates which are repeatedly marked in a reference region provided on the reference die.