Apparatus for detecting light-transmissive sheet-like body

Radiant energy – Photocells; circuits and apparatus – With circuit for evaluating a web – strand – strip – or sheet

Reexamination Certificate

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C250S559390, C356S429000

Reexamination Certificate

active

06943363

ABSTRACT:
Illuminating light emitted from a light source is led via a condenser lens, an optical fiber, a half-silvered mirror, and a condenser lens to a reflector. The reflector reflects the illuminating light to a CCD device through a telecentric optical system which comprises the condenser lens, the half-silvered mirror, and an aperture member. The illuminating light applied to the CCD device is greatly reduced in amount as it passes through a light-transmissive sheet-like body twice. The light-transmissive sheet-like body itself or an edge thereof can be detected with high accuracy even if the light-transmissive sheet-like body has a high transmittance.

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patent: 6151117 (2000-11-01), Tuhro et al.
patent: 6323954 (2001-11-01), Halter
patent: 6489624 (2002-12-01), Ushio et al.
patent: 2000-97867 (2000-04-01), None

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