Patent ID: 9240041
Filing Date: 2016-01-19
CPC Classification: G06T

Claim Text:
1. A defect inspection device comprising: a light source that illuminates a sample; a detector that receives light from an illuminated region of the sample; a first scanning unit comprising a polygon mirror, a galvano mirror, MEMS (micro electronics mechanics systems) mirror or a movable stage that changes a relative position between light from the light source and the sample in order to sequentially inspect a plurality of unit inspection regions; a comparison unit comprising a comparator that compares a detection signal output from the detector according to scanning in the first scanning unit with a threshold, the comparison unit further detects a defect candidate according to a result of a comparison; a mask position setting unit in a signal processor that sets a common position of the plurality of unit inspection regions as a mask position in order to mask the common position when the first scanning unit sequentially inspects the plurality of unit inspection regions, the mask position setting unit further sets a position where the defect candidate is detected in at least two of the unit inspection regions as the mask position for the plurality of the unit inspection regions; and a mask processing unit in the signal processor that detects a defect based on a comparison result in the comparison unit in another region than the mask position set by the mask position setting unit.