| 摘要 |
PROBLEM TO BE SOLVED: To accurately detect an approach of a fraudulent magnet without disposing one magnetic detection switch for each ball entry area located in the vicinity thereof and required to monitor the approach of the fraudulent magnet.SOLUTION: A door frame 5 includes a magnetism detection switch 3024 capable of discriminating whether or not a fraudulent magnet is approaching on the basis of detection signals from two magnetic impedance sensor elements that can highly accurately detects minute magnetism. A magnetism detection area of the magnetism detection switch 3024 ranging from a reference point to a detection distance SR of a detection surface of the magnetism detection switch 3024, is three-dimensionally preset in a front space of a game board and, when the game board is viewed from the front, includes respective types of winning holes, out hole and the like in which game balls flowing down a game area 1100 formed on the game board can enter. This configuration can monitor the approach of the fraudulent magnet to the respective types of winning holes, the out holes and the like.SELECTED DRAWING: Figure 2 |
