Radiant energy – Photocells; circuits and apparatus – With circuit for evaluating a web – strand – strip – or sheet
Reexamination Certificate
2007-01-25
2008-08-26
Song, Hoon (Department: 2882)
Radiant energy
Photocells; circuits and apparatus
With circuit for evaluating a web, strand, strip, or sheet
C356S237200
Reexamination Certificate
active
07417244
ABSTRACT:
An apparatus for detecting defects, including: a first illumination optical unit which illuminates from a normal direction or in the vicinity of the normal direction; a second illumination optical unit which illuminates from a first elevation angle; a first detection optical unit which detects light reflected by the illumination of the first illumination optical unit or the second illumination optical unit with plural detectors; a second detection optical unit which detects light reflected by the illumination of the first illumination optical unit or the second illumination optical unit with plural detectors; wherein the plural detectors of the first detection optical unit and the plural detectors of the second detection optical unit are photomultipliers, and the signal processor processes the signals outputted from the photomultipliers and are adjusted to balance in sensitivities.
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Ishimaru Ichiro
Kenbou Yukio
Moriyama Ichiro
Noguchi Minori
Tanabe Yoshikazu
Antonelli, Terry Stout & Kraus, LLP.
Hitachi , Ltd.
Hitachi High-Technologies Corporation
Song Hoon
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