Patent ID: 9194816
Filing Date: 2015-11-24
Classification: G01N

Abstract:
1. A method of detecting a defect of a substrate, the method comprising: irradiating a first light having a first intensity to a first region of the substrate through a first aperture to provide a first reflected light; detecting a defect in the first region based on the first reflected light from the first region; changing the first light into a second light having a second intensity at a time when an inspection region is changed from the first region to a second region of the substrate, wherein the second region is different than the first region; changing the first aperture into a second aperture at the time when the inspection region is changed from the first region to the second region, wherein changing the first aperture into the second aperture comprises controlling a spatial light modulator, and wherein the first and second apertures are defined in the spatial light modulator; irradiating the second light to the second region of the substrate through the second aperture to provide a second reflected light; and detecting a defect in the second region based on the second reflected light from the second region.