Patent ID: 7952701
Filing Date: 2011-05-31
Classification: G01N

Abstract:
1. A surface apparatus comprising: a stage for moving an article to be inspected with primary scan of rotational movement and secondary scan of translational movement, on which an article to be inspected is mounted; an illumination optics for forming an illumination spot by irradiating an illumination light flux from a light source to a predetermined position on the surface of the article to be inspected mounted on the stage for moving an article to be inspected; a collection optics for collecting light scattered, diffracted or reflected from the illumination spot; and a light detection optics for detecting the scattered light, diffracted light or reflected light collected by the collection optics and converting it to an electric signal, wherein a plurality of measurement units including the illumination optics, the collection optics, and the light detection optics are arranged substantially along the secondary scan direction of the stage for moving an article to be inspected; and wherein the stage for moving an article to be inspected moves/scans the article to be inspected at linear velocities different between an inner circumference portion of the article to be inspected and an outer circumference portion of the article to be inspected by combination of the primary scan and the secondary scan, and on the basis of information from the plurality of measurement units, a contaminant particle or a defect present on the surface or in the vicinity of the surface of the article to be inspected is detected.