Patent ID: 7768634

Claim:
A defects inspecting apparatus, comprising: a stage for mounting a specimen to be inspected and movable at least one direction; a first illuminating unit which illuminates a surface of the specimen with a first slit-like shaped polarized laser beam with a first incident angle to the surface of the specimen; a second illuminating unit which illuminates the surface of the specimen with a second slit-like shaped polarized laser beam with a second incident angle to the surface of the specimen which is an angle greater than the first incident angle; a first detecting optical unit installed in a first elevation angle direction to the surface of the specimen and having first image-forming optics and a first image sensor to detect a first image of the specimen illuminated by the first illuminating unit or a second image of the specimen illuminated by the second illuminating unit; a second detecting optical unit installed in a second elevation angle direction to the surface of the specimen which is an angle direction greater than the first elevation angle direction and having second image-forming optics and a second image sensor to detect a third image of the specimen illuminated by the first illuminating unit or a fourth image of the specimen illuminated by the second illuminating unit; and a processor which processes images detected by the first image sensor and the second image sensor to detect a defect on the specimen.