A laptop computer comprising:a main computer body having a microcomputer contained therein a keyboard a display cover pivotally mounted to said main computer body, for displaying information from said microcomputer a display on/off switch for interrupting the supply of power to the display cover when the display cover is pivotally folded over the main computer body a first means for receiving an interrupt signal from said microcomputer when said display on/off switch is off, and for determining whether or not said interrupt s. Also, it can interrupt the alarm by a user inputting a correct password during the generation of the alarm.

A burglar alarm is sounded when an interrupt occurs so when to indicate a robbery as the LCD on/off switch is turned on against a user's will during the operation of the computer. A laptop computer with an alarm function using an LCD on/off switch includes: a microcomputer both for controlling the LCD back-light section on/off operation in response to the on/off state of an LCD on/off switch and for generating an interrupt signal an alarm processor for determining whether or not the interrupt signal is a burglar alarm signal and outputs an alarm in case of a robbery and a password determining section for comparing a password entered by a user with a previously set password and interrupting the generation of an alarm only when bo.Ī laptop computer with an alarm function using an LCD on/off switch includes: a microcomputer both for controlling the LCD back-light section on/off operation in response to the on/off state of an LCD on/off switch and for generating an interrupt signal an alarm processor for determining whether or not the interrupt signal is a burglar alarm signal and outputs an alarm in case of a robbery and a password determining section for comparing a password entered by a user with a previously set password and interrupting the generation of an alarm only when both passwords are identical.

Laptop anti theft alarm