| 摘要 |
PURPOSE:To prevent a device from causing malfunction or non-operation, by additionally providing a permanent magnet on the free end part of the other end of a coil spring whose one side end is detained, and providing a magnetic resistance element on the side of the permanent magnet. CONSTITUTION:Onto the surface of an object 4 which is to be detected, one end of a coil spring 1 is detained, and in the free end of the spring 1, a permanent magnet 2 is installed, so that a variation is brought in the quantity of electrification in a magnetic resistance element 3 positioned at the side of the magnet 2. The quantity of vibration of the magnet 2, which has been grasped as a variation of this guantity of electricity is amplified, and after that, is inputted as a relay operating signal of an operation switch of an alarm, etc., so that an operating circuit of the alarm, etc. is closed. |
