| 摘要 |
<P>PROBLEM TO BE SOLVED: To achieve constant monitoring under conditions the same as those of the erroneous detection of balls which occurs when big balls and an electromagnetic wave output device are combined. <P>SOLUTION: A false ball detecting sensor 122S is attached to a ball guide panel 200. The false ball detecting sensor 122S is arranged in a region where prize winning ports are concentrated so that, for example, an external electromagnetic wave affects under the same conditions in which other ball detecting sensors 212 are affected. Since the false ball detecting sensor 122S includes a magnetic body 130 held in a passing hole 122SA, the conditions are the same when the big balls stay in the other ball detecting sensors 212. The conditions constantly affected by the external electromagnetic wave are maintained so that the presence of the electromagnetic wave is determined by monitoring output signals from the false ball detecting sensor 122S. <P>COPYRIGHT: (C)2012,JPO&INPIT |
