| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a game machine capable of detecting a fraudulent act using radio waves without being affected by a using frequency band. <P>SOLUTION: In the game machine, a radio wave detection circuit 300 is provided including: an antenna 313 for generating an induced voltage when electromagnetic waves are radiated from outside; a reference voltage output line L1 for outputting a prescribed reference voltage; an induced voltage output line L2 for outputting a voltage lower than the reference voltage; and a comparing means for outputting a voltage indicating magnitude relationship between the voltage output by the reference voltage line L1 and the voltage output by the induced voltage output line L2. In the reference voltage output line L1, a first diode 305 and a first capacitor 307 are connected in parallel, so that the induced voltage is not detected by the first diode 305. In the induced voltage output line L2, a second diode 306 is provided, so that the induced voltage is detected by the second diode 306 to generate a DC voltage. <P>COPYRIGHT: (C)2013,JPO&INPIT |
