| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a highly accurate door opening/closing detection device having a simplified assembling process. Ž<P>SOLUTION: A first moving magnet 12a and a second moving magnet 12b are mounted to a first door 2a and a second door 2b. A fixed magnet 9 is mounted to a frame to form a magnetic circuit with the first and second moving magnets 12a, 12b in the closed state. A first magnetic material part 10a and a second magnetic material part 10b are mounted to first and second magnetic poles of the fixed magnet 9, respectively to get through the leakage magnetic field leaked from the magnetic circuit. A distance between the first and second magnetic material parts 10a, 10b is set larger than the total distance of a distance between the first and second moving magnets 12a, 12b, a distance between the first moving magnet 12a and the first magnetic material part 10a and a distance between the second moving magnet 12b and the second magnetic material part 10b, with both the first door 2a and the second door 2b closed. A magnetic switch 7 is operated corresponding to the intensity of the leakage magnetic field. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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