Patent ID: 6559767
Filing Date: 2003-05-06
Classification: G08B

Abstract:
A vibration-sensing alarm device comprising:a receiving circuit for receiving radio signals transmitted from a transmitter when a distance between the transmitter and the receiving circuit is less than a predetermined distance; a decoder for decoding the signals transmitted from the receiving circuit; a control switch controlled by the decoder to be turned on when the receiving circuit fails to receive signals from the transmitter, indicating that the transmitter is farther than the predetermined distance away from the receiving circuit, and to be turned off when the receiving circuit receives signals from the transmitter, indicating that the transmitter is less than the predetermined distance away from the receiving circuit; an alarm circuit which is activated to drive an alarm module to generate an alarm when the control switch is turned on and a vibration is sensed, and which is disabled when the control switch is turned off; a power supply and timing control circuit for supplying power and timing signals to the receiving circuit, the decoder, the control switch, and the alarm circuit; and a motion sensor for turning on the power supply and timing control circuit when sensing a vibration, wherein turning on of the power supply and timing control circuit causes said alarm circuit to be activated only when the control switch is turned on, and said control switch is turned on only when said transmitter is farther than the predetermined distance away from the receiving circuit.