Patent ID: 9535013
Date: 2017-01-03
CPC Classifications: G01B,G01N

Claim:
1. A defect inspection method, including the steps of: emitting high-coherent broadband light beams from a high-coherent broadband light source; collecting the high-coherent broadband light beams emitted from the high-coherent broadband light source with a collective lens group configured to include plural lens groups provided with a first movable mechanism; selecting a wavelength condition from wavelength conditions of using at least one desired wavelength and of using a desired wavelength band in the high-coherent broadband light beams emitted from the high-coherent broadband light source collected by the collective lens group; selecting a high-coherent broadband light beam with the selected wavelength condition among those emitted from the high-coherent broadband light source; forming the high-coherent broadband light beam with the selected wavelength condition in a shape long in one direction; obliquely irradiating the high-coherent broadband light beam with the desired selected wavelength condition formed in the shape long in one direction onto an inspection target on the surface of which a pattern is formed; blocking a scattered light beam from the pattern formed on the inspection target by using a spatial filter among reflected scattered light beams from the inspection target onto which the high-coherent broadband light beam with the selected wavelength condition formed in the shape long in one direction is obliquely irradiated; capturing an image of a scattered light beam that has not been blocked among the reflected scattered light beams from the inspection target and passed through imaging lenses configured to include plural lens groups whose focal position is adjustable to the selected wavelength condition by using a second movable mechanism; generating an inspection image from a signal obtained by the capturing; and processing the generated inspection image to extract defects wherein the first movable mechanism, the second movable mechanism, and the spatial filter are controlled according to the selected wavelength.