Patent ID: 9551670
Date: 2017-01-24
CPC Classifications: G01N

Claim:
1. A surface inspection apparatus, comprising: a stage configured to support an inspection target mounted thereupon: a first illumination optical system configured to illuminate from a first angle the inspection target mounted on the stage; a second illumination optical system configured to illuminate from a second angle having a lower elevation angle than the first angle, the inspection target mounted on the stage; a reflection light detection system configured to detect a first reflected light reflected from the inspection target after being illuminated by the first illumination optical system, to convert the first reflected light to a first luminance data, to detect a second reflected light reflected from the inspection target after being illuminated by the second illumination optical system, and to convert the second reflected light to a second luminance data; a defect classification system configured to recognize first luminance data and second luminance data arising from positions located in close proximity to each other as data of a concatenated defect, and to classify a linear concatenated defect as a scratch by referring to the logical sum of said first luminance data and said second luminance data; and an output portion configured to output information of the type of the detect classified in the effect classification system.