| 摘要 |
PROBLEM TO BE SOLVED: To prevent a fraud using a magnet, display its fraudulent state and disable the continuation of the fraud in game machines such as Pachinko machines and slot machines, especially in the Pachinko machines. SOLUTION: The fraud prevention device includes: a window glass 2 having an outer glass 21 and an inner glass 22 in a game machine; and a liquid crystal sheet part 3 having a polymer/liquid crystal composite material 33 clamped between a pair of transparent electrode layers 31 and 32, wherein the pair of transparent electrode layers 31 and 32 is clamped between a pair of sheet-like substrates 34 and 34. The liquid crystal sheet part 3 is superposed on either of the facing surface of the outer glass 21 or the inner glass 22. Either one of the pair of transparent electrode layers 31 and 32 is addedly provided with a plurality of strip electrodes via slight clearances of non-electrodes, and the other is defined as a full-face electrode. A fraud prevention circuit whose at least part of the strip electrodes is operated by a signal using a magnet is provided between the pair of transparent electrode layers 31 and 32. COPYRIGHT: (C)2009,JPO&INPIT
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