Patent Document ID: 20020168787
Application ID: 10170378
Patent Flag: 0

Claim One:
1. A defect inspection method comprising: an illumination process of radiating an illumination slit-shaped beam comprising lights substantially parallel to a longitudinal direction to a substrate serving as an object of inspection and having circuit patterns created thereon in a direction inclined at a predetermined gradient relative to the direction of a line normal to said substrate and inclined at a predetermined gradient on a surface with respect to a group of main straight lines of said circuit patterns with its longitudinal direction oriented almost perpendicularly to a direction of a movement of a moving stage for mounting and moving said inspected substrate; a detection process of receiving a scattered light reflected by a defect such as a foreign particle existing on said inspected substrate illuminated in said illumination process and converting said received light into a detection signal by using an image sensor; and a defect judging process of extracting a signal indicating a defect such as a foreign particle on the basis of said detection signal output in said detection process.