Reflector and anti-fog film in an optical sensor system
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United States of America Patent
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Oct 7, 2003
Grant Date -
N/A
app pub date -
Nov 15, 2001
filing date -
Nov 21, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A dispensed product detection system and method for use in a refrigerated vending machine utilizing an optical light beam crossing the path through which a dispensed product travels. An optical emitter transmits a light beam through at least one layer of substantially transparent anti-fog film to reduce moisture condensation and across the product path to an optical detector wherein signal intensity is measured. As a dispensed product passes through the light beam between the emitter and the detector, the beam is momentarily broken, resulting in a change in signal intensity at the infrared detector which is registered as the vend of a product.
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