Patent ID: 8514388

Claim:
A device for inspecting a defect, comprising: table means for holding a sample; illumination means for illuminating a linear region that lies on the sample held by the table means; high-angle detection optical system means having a plurality of optical image detectors, the optical image detectors detecting, from plural azimuth directions, light scattered from the linear region that lies on the sample illuminated by the illumination means, the scattered light being scattered from the linear region at a high evaluation; low-angle detection optical system means having plural optical image detectors, the optical image detectors detecting, from plural azimuth directions, light scattered from the linear region that lies on the sample illuminated by the illumination means, the scattered light scattered from the linear region at a low evaluation; and a signal processing unit that processes a signal obtained by detecting the light scattered from the sample by means of the high-angle detection optical system means and a signal obtained by detecting the light scattered from the sample by means of the low-angle detection optical system means to detect a defect on the sample, wherein the optical image detector of the low-angle detection optical system is formed by synthesizing a first imaging lens group, a diffraction grating, a second imaging lens group and an image detector having plural light receiving surfaces, and wherein the signal processing unit sums and processes signals detected by light receiving surfaces that are included in the plural optical image detectors of the low-angle detection optical system means and correspond to each other.