| 摘要 |
PROBLEM TO BE SOLVED: To provide a game board unit which always prevents a game ball having passed through a ball passing-through detector from being moved toward the ball passing-through detector by means of an illegal tool. SOLUTION: The game board unit is provided with: a ball path 50 which ejects from a ball exit the game ball 23 detected by the ball passing-through detector 40; and a ball backflow prevention tool 51 which separates the path of the game ball 23 in the ball path 50 to always prevent the game ball 23 having passed through the ball passing-through detector 40 from being moved toward the ball passing-through detector 40 by means of the illegal tool. COPYRIGHT: (C)2011,JPO&INPIT
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