| 摘要 |
PROBLEM TO BE SOLVED: To provide a game machine capable of stably detecting fraudulence using a magnet without impairing the visibility of a game area, and capable of reducing the possibility of wrong detection.SOLUTION: The game machine 1 includes a transparent plate unit 4 to be detachably attached to a window 5 of a front frame member 3, a coil 8 disposed in the peripheral edge of the transparent plate unit 4 and wound around the game area onto which game balls are shot, and a plurality of distance sensors 9a and 9b disposed in the peripheral edge of the transparent plate unit 4 for measuring the distance to an article present near the front surface of the transparent plate unit 4. Variation in the magnetism in the vicinity of the window is detected based on the induced electromotive force generated in the coil 8, and the position of the article on a game board surface is detected based on the result of measurement by the plurality of distance sensors 9a and 9b. Then, fraudulence is detected on condition that the variation in the magnetism in the vicinity of the window is detected and that the article located in a prescribed area on the game board surface is detected. |
