Patent ID: 7242016

Claim:
An inspection apparatus comprising: a stage for mounting an inspection target thereon and being movable in at least two-dimensional directions; a first illumination optical system for illuminating the inspection target mounted on the stage from a first angle; a second illumination optical system for illuminating the inspection target mounted on the stage from a lower angle relative to the first angle; a reflection light detection system having a first reflection light detection portion for detecting a light reflecting in a first direction among reflection lights reflected from the inspection target illuminated by the first illumination optical system and the second illumination optical system, and a second reflection light detection portion for detecting a light reflecting in a second direction among the reflection lights from the first illumination optical system and the second illumination optical system; a defect detection system for detecting a defect on the inspection target using first output signals from the first reflection light detection portion and the second reflection light detection portion of the reflection light detection system by the illumination of said first illumination optical system, and second output signals from the first reflection light detection portion and the second reflection light detection portion of the reflection light detection system by the illumination of said second illumination optical system; a defect classification system for classifying a type of the defect detected by the defect detection system by using information on said first output signals and said second output signals; and an output portion for outputting information of the type of the detect classified in the defect classification system.