| 摘要 |
PROBLEM TO BE SOLVED: To provide a simply structured vibration sensor having enhanced sensitivity for detecting vibration, by receiving less influence on a magnet from earth magnetism and an external magnetic field. SOLUTION: In this vibration sensor 5, the shape of an inner wall formed by a bobbin base 3 and a bobbin cap 4 is an elliptical sphere, and a four pole spherical magnet 1 is rotatably and movably enwrapped in it. Poles of the magnet 1 facing each other have the same polarity. A hole element 2 is adhered so as to sandwich the inner wall 3f. Since miniaturization can be materialized and influence form an external magnetic field can be lessened, and a magnetic body with a high magnetic force can be used, sensitivity can be enhanced.
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