ALARM DEVICE, AND ALARM SYSTEM EQUIPPED WITH THE SAME AND AUTOMOBILE

PROBLEM TO BE SOLVED: To provide a technology which enables a user to preknow that an alarm means gives a main alarm, in an alarm device with the alarm means for giving the main alarm after unlocking a locked door by a means different from a prescribed means and opening the unlocked door. SOLUTION: This burglar alarm device for an automobile comprises a remote-control key, an input-signal determination circuit, an alarm output circuit and a horn. When the door is unlocked by a means except the remote-control key, the warning state of the burglar alarm device is not released because an unlocking signal is not inputted into the input-signal determination circuit. When the warning state of the burglar alarm device is not released, a prenotification alarm signal is inputted into the alarm output circuit by the input-signal determination circuit in opening the door. When the prenotification alarm signal is inputted into the alarm output circuit by the input-signal determination circuit, the horn is sounded as a prenotification alarm for 100 ms. COPYRIGHT: (C)2004,JPO