| 摘要 |
PROBLEM TO BE SOLVED: To obtain a vibration sensor which can detect vibrations with high precision without being affected by a position or a rolling direction of a ball and is superior in reliability. SOLUTION: A vibration sensor 24 is provided with a board 26 having a detection region 32 on a rolling surface 28, a plurality of positive electrode contacts 38 and negative electrode contacts 41 arranged in the detection region of the board, and a conductive ball 33 which rolls along the rolling surface at the time of vibrations and also transfers the positive electrode contacts and the negative electrode contacts from a continuity state to a non-continuity state, or vice versa by this rolling. The positive electrode contacts and the negative electrode contacts are each linear, and also mutually disposed in parallel in the presence of disposition intervals over which the ball strides, and further the positive electrode contacts and negative electrode contacts extend ranging over the entire region of the detection region.
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