| 摘要 |
PROBLEM TO BE SOLVED: To provide an impact sensor that can fully give magnetic force to make the contact portion of a reed switch into the closed state from a magnet moving with acceleration and that has a structure stabilizing the motion at detection of the acceleration. SOLUTION: Because a front stopper 7 has a collision face to lock the end face of a magnet 4 having the top face of projections 7a, 7b with different heights, repulsive forces in the opposite directions along the rotating direction of a magnet 40 produced direction in terms of the step direction make the magnet 40 rotate, when the magnet 4 is moved to the limit of the moving range of the front stopper 7 side to hit the top face of projections 7a, 7b, and this causes the stagnation of the magnet 4 in the vicinity if the front stopper 7, to enable to delay the time that the magnet 4 is pushed back toward the other side, resulting in elongation of time of giving magnetic force to turn the contact point of the reed switch in the closed ON state.
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