Optics: measuring and testing – Inspection of flaws or impurities – Surface condition
Reexamination Certificate
2011-03-15
2011-03-15
Chowdhury, Tarifur R. (Department: 2886)
Optics: measuring and testing
Inspection of flaws or impurities
Surface condition
C356S237100, C356S237500
Reexamination Certificate
active
07907270
ABSTRACT:
According to a first aspect of the present invention, there is provided an inspection apparatus including an objective lens, a reflected illumination optical system that illuminates a first area which is part of a field of view of the objective lens, a transmitted illumination optical system that illuminates the first area and a second area; an adjusting unit that adjusts positions on the sample of transmitted illumination light from the transmitted illumination optical system and reflected illumination light from the reflected illumination optical system; a first detector that detects a transmitted light transmitted by the sample and a reflected light reflected by the sample in the first area; and a second detector that detects through the objective lens a transmitted light transmitted by the sample in the second area.
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Akanbi Isiaka O
Chowdhury Tarifur R.
Lasertec Corporation
Sughrue & Mion, PLLC
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