Apparatus and method for testing defects

Details Apparatus and method for testing defects Apparatus and method for testing defects

2007-03-05

2008-10-28

Chowdhury, Tarifur R. (Department: 2886)

Optics: measuring and testing

Inspection of flaws or impurities

Surface condition

Reexamination Certificate

active

07443496

ABSTRACT:
A defect inspection apparatus includes an illumination optical unit for obliquely illuminating an object with a slit-like shaped laser, a first detection optical unit for detecting a first image formed by light reflected from the object by the illumination of the slit-like shaped laser and reflected in a first direction substantially normal to a surface of the object, a second detection optical unit for detecting a second image formed by light reflected from the object by the illumination of the slit-like shaped laser and reflected in a second direction inclined to the normal direction to the surface of the object, an image signal processing unit which processes a signal outputted from the first detection optical unit and a signal outputted from the second detection optical unit, and an output unit which outputs information processed by the image signal processing unit.

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