Patent ID: 7548160
Filing Date: 2009-06-16
Classification: G06F,G08B

Abstract:
1. An anti-theft alarm system for a portable computer, the anti-theft alarm system comprising: a detecting switch portion comprising an electronic switch and a mechanical switch; a keyboard controller (KBC) configured for outputting an enable signal to the electronic switch to activate the alarm system and protect the portable computer from theft, wherein a first terminal of the electronic switch is connected to the KBC and connected to a voltage input via a resistor, a second terminal of the electronic switch is connected to the voltage input via a resistor, grounded via a resistor, and connected to the KBC, the mechanical switch is connected between a third terminal of the electronic switch and ground; a key of a keyboard of the portable computer configured for delivering an alarm system enabling signal to the KBC and causing the KBC to output the enable signal, wherein if the portable computer is moved without deactivation of the alarm system, the mechanical switch opens, causing a change of a voltage at the electronic switch which is detected by the KBC, the KBC thereby sends an alarm control signal to an audio system of the portable computer, and the audio system produces an audible sound for a theft deterrence effect.