| 摘要 |
PROBLEM TO BE SOLVED: To provide a game machine provided with a fraudulence monitoring means capable of quickly and surely detecting peeling or cutting of a sealing sticker which seals electronic components such as a CPU or a ROM. SOLUTION: Sealing is executed over a CPU chip 200 with a conductive sealing sticker 150, and a pair of conductive coils 104a and 104b are disposed on the back surface side of a substrate to which the respective end parts of the sealing sticker are stuck. An eddy current is generated in the sealing sticker by supplying an AC primary current to one conductive coil, and a secondary current is excited in the other conductive coil by the eddy current propagated on the surface. A decision circuit 117 decides the peeling or cutting of the sealing sticker when the propagation ratio of the secondary current to the primary current becomes equal to or lower than a reference value. At the time, a latch circuit 112 outputs a signal for inhibiting the operation to the CPU chip until a prescribed release operation is performed. COPYRIGHT: (C)2009,JPO&INPIT
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