Apparatus for detecting light-transmissive sheet-like body

Details Apparatus for detecting light-transmissive sheet-like body Apparatus for detecting light-transmissive sheet-like body

2006-12-05

2006-12-05

Luu, Thanh X. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

With circuit for evaluating a web, strand, strip, or sheet

C250S559390, C356S429000

Reexamination Certificate

active

07145163

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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