| 摘要 |
PROBLEM TO BE SOLVED: To detect the unfair open of a cabinet door substantially, detect the change or the failure of a detecting method immediately, and prevent an unfair behavior of opening or closing the cabinet door substantially. SOLUTION: In this detector, a sheet type of a resonance circuit 10 resonating by a resonance frequency fo is stuck on the rear surface made of glass of a cabinet door 6 like a sticker, and a Colpitts self-excited oscillator 12 oscillating the resonance frequency fo is arranged on the other game machine facing to. Thus, the distance between the oscillator and the resonator is lengthened, when the cabinet door is wrongfully opened or closed, and it is detected that the oscillation strength in the resonance frequency fo of the oscillator decreasing by resonance is intensified. Therefore, the wrong open or close of the cabinet door can be detected.
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