Patent ID: 6011471
Filing Date: 2000-01-04
Classification: G08B

Abstract:
A alarm system for use with an electronic apparatus having a slot, comprising:a radio transmitter unit, said radio transmitter unit comprising a transmitting circuit and a transmitting control device controlling on/off said transmitting circuit, said transmitting circuit comprised of an encoder, a radio signal transmitter, a control switch, and a transmitting antenna, said encoder outputting a code signal to said radio signal transmitter when turned on said transmitting control device, enabling the code signal to be transmitted through said transmitting antenna into the air by radio; anda radio receiver unit for insertion into the slot of the electronic apparatus, said radio receiver unit comprising a casing fitting the slot at the electronic apparatus, a receiving antenna, which receives the code signal from said radio transmitter unit within a predetermined distance between said radio transmitter unit and said radio receiver unit, a decoder, which recognizes the code signal received by said receiving antenna, an alarm device, a receiving control device, which drives said alarm device to output an alarm signal when said receiving antenna receives no signal from said radio transmitter unit, and a security switch controlled to turn on/off said radio receiver unit.