Patent ID: 7911599
Filing Date: 2011-03-22
Classification: G01N,G03F

Abstract:
1. A reticle defect inspection apparatus for inspecting for defects on a sample using a pattern image obtained by irradiating the sample on which patterns are formed with light, comprising: a light source; an optical system of transmitted illumination configured to irradiate one surface of the sample with a first inspection light; an optical system of reflected illumination configured to irradiate another surface of the sample with a second inspection light; a detecting optical system configured to simultaneously detect a transmitted light obtained by the first inspection light being transmitted through the sample and a reflected light obtained by the second inspection light being reflected by the sample; a first imaging device configured to inspect the pattern image obtained by the transmitted light; and a second imaging device configured to inspect the pattern image obtained by the reflected light, wherein the optical system of transmitted illumination comprises a focusing lens being located on an optical path between the light source and the sample, and a focusing lens driving mechanism configured to correct a focal point shift of the transmitted light resulting from a thickness of the sample by moving the focusing lens.