Reflective optical sensor for bill validator

Details Reflective optical sensor for bill validator Reflective optical sensor for bill validator

2007-09-18

2007-09-18

Porta, David (Department: 2884)

Radiant energy

Luminophor irradiation

With ultraviolet source

C250S461100, C382S135000

Reexamination Certificate

active

11009061

ABSTRACT:
A simple high optical efficiency reflective optical sensor for bill validator uses an inexpensive bulb having a case which is transparent to efficient luminous radiation. This case is used as a wave guide to return reflected radiation to at least one photo detector situated directly under the transparent bottom of the case. The bulb emits a narrow beam of light and is positioned in close proximity and perpendicular to a bill surface and illuminates it. The light reflected or fluoresced by the bill is collected widely with a convex lens end of the bulb case and this collected radiation is transmitted through the bulb case to the at least one photo detector. Preferably, the bulb is a light emitting diode.

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patent: 2004/0021850 (2004-02-01), Evans et al.
patent: 2 376 788 (2002-12-01), None

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