G - Physics – 07 – F
Patent
G - Physics
07
F
340/124.4
G07F 11/58 (2006.01) G07F 9/02 (2006.01)
Patent
CA 1125882
MULTIPLE-BEAM OPTICAL SENSING SYSTEM FOR AN ARTICLE VENDOR Abstract of the Disclosure A multiple-beam optical sensing system for an article vendor having a delivery station to which an article to be vended is delivered during the vend which system includes first and second optoelectronic emitters, first and second optoelectronic detectors, a circuit for energizing the emitters, and a logic circuit. The emitters emit electromagnetic radiation across the delivery station to the detectors, each detector being disposed across the delivery station from its respective emitter. When no article is pre- sent at the delivery station, the radiation from the emitters is unobstructed in its passage across -the delivery station from the emitters to their respec- tive detectors. When an article is present, however, the radiation is at least partially obstructed. The detectors detect the presence of an article at the delivery station by the obstruction of the radiation from their respective emitters. The energizing circuit enables the emitters alternately so that when one emitter is enabled the other is disabled. The logic circuit determines that an article is present at the delivery station by examining the detectors in turn, a detector being examined only when its corresponding emitter is enabled.
334949
Smart & Biggar
Umc Industries Inc.
LandOfFree
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