Patent ID: 8502966

Claim:
An apparatus for inspecting a defect on a surface of a sample, comprising: rotatable and movable table means on which a sample is mounted; first illumination and detection means which irradiates a surface of the sample mounted on the table means with a first laser and detects reflected light from the sample; second illumination and detection means which irradiates the surface of the sample mounted on the table means with a second laser and detects reflected light from the sample; and signal processing means which processes signals output from the first illumination and detection means and the second illumination and detection means and detects a defect on the sample, wherein the first illumination and detection means includes an illumination unit which irradiates the sample with laser and a scattering light detection unit which collects scattering light components of the reflected light from the sample irradiated with the laser by excluding specularly reflected light components by using an aspheric flannel lens which has a greater numerical aperture than a conventional optical lens when installing the conventional optical lens instead of the aspheric flannel lens and detects the scattering light components from a smaller defect than the conventional optical lens when installing the conventional optical lens instead of the aspheric flannel lens.