| 摘要 |
PROBLEM TO BE SOLVED: To provide a crime-preventive magnetic proximity sensor capable of setting and changing a position for outputting an open signal by a sensor block by a simple operation on a magnet block side. SOLUTION: The magnet block m is composed of first and second magnet members Ma and Mb. The first magnet member Ma is attached to a window, the second magnet member Mb is adapted to cancel the magnetic field of an magnet member of an optional pair by being magnetized so that its magnetic poles are opposed to the magnetic poles different therefrom of the first magnet member Ma. COPYRIGHT: (C)2005,JPO&NCIPI
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