| 摘要 |
PURPOSE: To increase DWT by providing a ring-shaped magnet, which has a central axis in common with a moving magnet and has polarity of the same direction, on the periphery of a central part of a lead switch. CONSTITUTION: Since a fixed magnet 6 and a moving magnet 2 of which polarity is in the same direction and which is supported by a coil spring 3 cancel each other's magnetic forces, a contact point of a lead switch 1 is in the released state. When acceleration is applied there, the moving magnet 23 starts moving, so that the balance of a magnetic field, which has been conceled each other at initial condition, is thrown off, and the contact point of the lead switch 1 is closed. While the acceleration continues, the moving magnet 2 continues to move, and stops at a stopper 7. When the application of acceleration is stopped, the magnet 2 starts returning to the initial position due to resiliency of the coil spring 3, and then, at the position where the magnetic fields of the fixed and moving magnets 6 and 2 negate each other, the contact point of the switch 1 is diconnected. As a result, Dwell Time(DWT) is increased.
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