Patent Document ID: 7692779
Application ID: 11244080
Patent Flag: 1

Claim One:
1. A defect inspecting apparatus comprising: an illumination optical unit for obliquely illuminating an object with a laser, which is converged in one direction and collimated in a direction transverse to the one direction; a first detection optical unit including a first image sensor for detecting a first image formed by light reflected from the object by the illumination of the laser and reflected in a first direction inclined with respect to a normal direction to a surface of the object; a second detection optical unit including a second image sensor for detecting a second image formed by light reflected from the object by the illumination of the laser and reflected in a second direction which is inclined to the normal direction to the surface of the object; an image signal processing unit which processes both of a signal outputted from the first detection optical unit by the detection of the first image and a signal outputted from the second detection optical unit by the detection of the second image; and an output unit which outputs information processed by the image signal processing unit; wherein both of the first detection optical unit and the second detection optical unit includes a variable spatial filter which cuts off light reflected from patterns formed on the object.