| 摘要 |
<p>PURPOSE:To obtain an inexpensive vibration sensor with simple constitution which can be produced easily and can detect vibrations surely by elastically receiving the vibration of a mobile object sealed in a cylindrical body with hollow space and detecting vibrations by allowing a contact to be energized when the elastic body is compressed more than a constant quantity. CONSTITUTION:This sensor is constituted of a cylindrical body 20 whose internal part is hollow, the mobile body 21 is sealed freely movably in the internal space of the cylindrical body 20, a spring (elastic material) 25 which is positioned in the cylindrical body and receives the oscillation of the mobile object 20 elastically and contact mechanisms 22, 23, 30, 31, 32, etc., to be energized when the spring 25 is compressed by the mobile object 21 more than a constant quantity. A vibration sensor 13 by this constitution is provided on a burgular preventing machine 1, the brightness and the darkness of light are detected by a light sensor 5, vibration is detected by the sensor 13, they are fetched in an alarming circuit and an alarm is issued when constant conditions are detected. Then, since the vibration is detected by constituting the contact mechanism that the contacts 31 and 32 are connected only when the mobile object collides with the spring by only inertia, sure detection is executed.</p> |
