UNFAIR PRIZE BALL PREVENTING DEVICE OF PLAYING MACHINE

摘要

PURPOSE:To prevent the unfair prize winning by an external radio wave by providing, to a playing machine, a detecting means for detecting the emission of a radio wave having a desired frequency and an alarm means for outputting an alarm on the basis of the detection signal from the detecting means. CONSTITUTION:When a radio wave is emitted in order to break the electronic substrate mounted on a playing machine 1, the radio wave inputted through an antenna 13 is detected by a wave detecting means 15. The wave detecting means 15 detects only radio waves having high frequencies possible to break the IC chip of the electronic substrate, and also outputs the detection signal of a voltage according to the field strength of the radio wave. The detection signal from the wave detecting means 15 is outputted by a comparison circuit 17 only when it has a field strength enough to break the IC chip, whereby it is selected from external noises having weak field strengths. When the output signal is outputted from a timer circuit 19, an output circuit 21 operates an alarm member 23, which makes possible to judge the playing machine 1 to which the radio wave for unfair prize ball is emitted, and also gives an alarm to the worker.