Anti theft system for electronic devices, destroys vital parts of device electronically if two levels of acoustic or warning signals are ignored

摘要

The monitoring circuit (20) coupled to the device (1) being protected against theft is associated with a number of pre-selected alarm levels. A first alarm level activated by a sensor (2, 3) associated with the device results in the circuit generating acoustic and/or visual signals, e.g. warning that theft of the device will result in vital parts and/or circuits being destroyed within a given time period. A second alarm level can be activated during or after this time period, resulting in the circuit generating further acoustic and/or visual signals, warning again of the risk of the these parts and/or circuits being destroyed. A third alarm level in the form of an output signal that destroys these parts/or circuits is activated by a means during or after a given time period associated with the second alarm level. The device is provided with a movement sensors (2) and/or power voltage drop sensor (3) connected or coupled to a monitoring circuit designed to transmit an output signal to a conductor when one of the sensors is activated. The conductor is connected to vital parts and/or circuits in the device, causing them to be destroyed when the output signal is received.