Patent ID: 9513228
Filing Date: 2016-12-06
CPC Classification: G01N,G03F

Claim Text:
1. A defect inspection device, comprising: a table unit on which a target sample to be inspected is mounted; an illumination optical system unit configured to obliquely illuminate the sample mounted on the table unit; a detecting optical system unit which condenses scattered light generated from the sample on which illumination light is obliquely irradiated by the illumination light optical system unit, and detects an image on a surface of the sample using the scattered light; an image processing unit configured to process a signal obtained by detecting the image on the surface of the sample using the scattered light by the detecting optical system unit, to extract defect candidates on the surface of the sample; and a control unit which controls the table unit, the illumination optical system unit, the detecting optical system unit, and the image processing unit, wherein the illumination optical system unit includes wherein a polarization condition of the laser beam passing through the anamorphic optical unit and the cylindrical optical unit is a specific linearly polarized condition, wherein optical coatings are applied to surfaces of a cylindrical lens of the cylindrical optical unit, said optical coatings corresponding to the polarization state of the laser beam to reduce power loss of the laser beam, and wherein the relay lens unit includes a polarization control element which controls polarization condition of the laser beam illuminating the specimen.