Patent ID: 8873031
Filing Date: 2014-10-28
Classification: G01N

Abstract:
1. A disk surface inspection apparatus, comprising: a stage unit that is capable of rotating while holding a magnetic medium disk as a sample and capable of moving in a direction vertical to a rotation central axis; an illumination unit that irradiates a front surface of the sample placed on the stage unit with light; a regular reflection light detection unit that detects regular reflection light reflected from the front surface of the sample irradiated with light by the illumination unit; a low-angle scattered light detection unit that detects scattered light in the vicinity of the regular reflection light reflected from the front surface of the sample irradiated with light by the illumination unit, and separated from the regular reflection light; a high-angle scattered light detection unit that detects scattered light scattered, from the sample irradiated with light by the illumination unit, in a high angle direction greater than the direction of the regular reflection light with respect to a normal line direction of the sample; and a processing unit that processes an output signal from the regular reflection light detection unit, an output signal from the low-angle scattered light detection unit and an output signal from the high-angle scattered light detection unit, and detects defects on the surface of the sample, wherein the processing unit further includes: