SECURITY DEVICE

PURPOSE:To accurately detect the disassembly, drilling, and destruction of a case. CONSTITUTION:Signal lines 24, 26 are installed in upper and lower inner surfaces of cases 10 and 12. The both signal lines 24 and 26 are connected in series in assembling state of the cases 10 and 12. Either signal li...

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Bibliographische Detailangaben
Hauptverfasser:	NAGURA MICHINAGA, YAMASHITA CHIKASHI
Format:	Patent
Sprache:	eng
Schlagworte:	ALARM SYSTEMS CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR ELECTRICITY MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS ORDER TELEGRAPHS PHYSICS PRINTED CIRCUITS SIGNALLING SIGNALLING OR CALLING SYSTEMS
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Beschreibung
Zusammenfassung:	PURPOSE:To accurately detect the disassembly, drilling, and destruction of a case. CONSTITUTION:Signal lines 24, 26 are installed in upper and lower inner surfaces of cases 10 and 12. The both signal lines 24 and 26 are connected in series in assembling state of the cases 10 and 12. Either signal line 24 is connected to an input port I of a microcomputer 22, and the other signal line 26 is connected to GND. In the normal state, the input port I of the microcomputer 22 is conducted with GND, maintaining the input voltage at low level. On the other hand, when drilling, destuction and disassembly action is performed on the both cases 10 and 12, the signal lines 24 and 26 are disconnected. Thus, the input port I of the microcomputer 22 is in a nonconducting state and the input voltage is reversed at high level to detect the drilling, destruction, and diassembly processing.