Patent ID: 7557913
Filing Date: 2009-07-07
Classification: G01N

Abstract:
1. An optical apparatus for defect inspection having a stage for mounting a specimen, an illuminating optical system for irradiating illumination light beams for inspection having predetermined incident angles on the surface of the specimen to form a beam spot on the specimen surface and a detection optical system for detecting a reflection light ray originating from the beam spot, comprising: a storage unit in which the position and size of a standard particle of known size arranged on a specimen for correction are stored in advance; a correction processing section which, when the specimen for correction is used as an inspection target, correlates an output from said detection optical system based on a scattering light ray from the standard particle of known size with the known size of standard particle stored at a corresponding position in the storage unit to prepare a correlation between the output of said detection optical system and a true value; and a signal processing section which, when an inspection specimen is used as an inspection target, converts an output from said detection optical system into a size of a defect on the basis of the correlation prepared by said correction processing section.