Patent ID: 6736250
Filing Date: 2004-05-18
Classification: G07D,G07F

Abstract:
A system for detecting fraudulent coin or token submission to a gaming device comprising:one or more light sources configured to generate light energy; one or more light detectors configured to detect the presence and absence of the light energy generated by the one or more light sources and convert the detected light energy to a detected electrical signal having a detected modulation pattern; one or more modulators configured to generate and provide one or more modulated signals having a modulation pattern to the one or more light sources; and a controller connected to at least one of the one or more modulators and at least one of the one or more light detectors, the controller configured to compare the modulation pattern of the one or more modulated signals to the detected electrical signal and output a fraud signal if the detected electrical signal has a detected modulation pattern that is different than the modulation pattern of the one or more modulators.