Patent ID: 9470640
Filing Date: 2016-10-18
CPC Classification: G01N,H01L

Claim Text:
1. A defect inspection device, comprising: an irradiation unit that irradiates a surface-patterned sample with light from an inclined direction relative to the surface of the sample; a detection unit that includes a plurality of detection optical systems to detect respectively a plurality of portions of scattered light coming from the surface of the sample irradiated with light by the irradiation unit; and a processing unit that processes a plurality of signals based on the plurality of the portions of the scattered light detected respectively by the plurality of the detection optical systems in the detection unit, wherein: the detection unit detects the plurality of the portions of the scattered light using the plurality of the detection optical systems including, at least, a first detection optical system including a detector placed in a normal direction relative to the surface of the sample, a second detection optical system including a detector placed in a direction at an elevation angle relative to the surface of the sample different from an elevation angle at which the first detection optical system is located, and a third detection optical system including a detector placed in a direction at an elevation angle relative to the surface of the sample different from the elevation angles at which the first detection optical system and the second detection optical system are located; and the processing unit evaluates, relative to a first signal based on the first portion of the scattered light detected by the first detection optical system, a second signal based on the second portion of the scattered light detected by the second detection optical system and a third signal based on the third portion of the scattered light detected by the third detection optical system in order to detect a defect.