Optics: measuring and testing – Inspection of flaws or impurities – Surface condition
Reexamination Certificate
2009-02-06
2010-12-28
Nguyen, Sang (Department: 2886)
Optics: measuring and testing
Inspection of flaws or impurities
Surface condition
C356S237400, C356S237500, C250S548000
Reexamination Certificate
active
07859656
ABSTRACT:
An inspection system includes: a facility that uses wide-band illumination light having different wavelengths and single-wavelength light to perform dark-field illumination on an object of inspection, which has the surface thereof coated with a transparent film, in a plurality of illuminating directions at a plurality of illuminating angles; a facility that detects light reflected or scattered from repetitive patterns and light reflected or scattered from non-repetitive patterns with the wavelengths thereof separated from each other; a facility that efficiently detects light reflected or scattered from a foreign matter or defect in the repetitive patterns or non-repetitive patterns or a foreign matter or defect on the surface of the transparent film; and a facility that removes light, which is diffracted by the repetitive patterns, from a diffracted light image of actual patterns or design data representing patterns. Consequently, a more microscopic defect can be detected stably.
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Hamamatsu Akira
Nakano Hiroyuki
Shibata Yukihiro
Urano Yuta
Uto Sachio
Antonelli, Terry Stout & Kraus, LLP.
Hitachi high-Technologies Corporation
Nguyen Sang
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