| 摘要 |
PROBLEM TO BE SOLVED: To provide a vibration sensor that accurately senses vibration even though its structure is simple, and that can adjust the magnitude of vibration to be sensed and has good operability.SOLUTION: A vibration sensor according to the invention is characterized in that balance of a left weight and a right weight is kept using a center as a supporting point so that the principle of balance will be used, and by use of magnetic force of a magnet provided at one side and by moving the supporting point by vibration, the magnetic force has the balance lost, then the weights join together with the magnet, the weights and an electrode provided on the magnet contact, and switch is turned on. The vibration sensor has a second characteristic in that a sensing level by the magnitude of vibration can be changed by imposing a load on the movement of the supporting point, and further, the balance is adjusted by having one of the weights made movable, and the sensing level by the magnitude of vibration can be changed. |
