| 摘要 |
PURPOSE:To prevent car theft by producing alarm current continuously when unfit key is used for unlocking of door or starting of engine. CONSTITUTION:Door and a starter switch locks are incorporated with microswitches B, C for functioning key A identifier F and a magnetic resistance element E for converting the magnetic recognition code of key into a current signal. Upon insertion of unfit key into said lock, a mismatch signal voltage is produced from the identifier F to function a magnet switch H associated with interlock thus to produce alarm current continuously. While upon insertion of correct key, the alarm current produced from said switch H is interrupted. |
