| 摘要 |
PURPOSE:To form a burglar preventing device without using a special part by forming a burglar preventing circuit based on a combination relation between the ON and OFF state of a key switch and the state of a door switch, and sounding a horn when operation is not effected in a given order. CONSTITUTION:When an alarming device is set before leaving an automobile, an automobile door is opened before a key switch 32 is turned OFF for the stop of an engine. In which case, a door switch 33 is turned ON and a timer circuit 12 is energized. When the key switch 32 is turned OFF within a set time (approximate five seconds) of the timer circuit 12, a set reset circuit 11 in an alarming device is brought into a set state. After the key switch 32 is turned OFF, the timer circuit 12 starts counting of a second set time (approximate 30 seconds), and when a set time elapses, the alarming is brought into a waiting state capable of sounding an alarm. when, with this state, a door is opened by a person having no key, a horn switch 35 is closed through a relay 16, and a horn 36 is sounded. |
