Patent ID: 6624752
Filing Date: 2003-09-23
Classification: A45C,G01V,G06K

Abstract:
An object detection system comprising:at least one first transmitting unit to be located near the object, the first unit having an identity and being provided with a transmitter for transmitting a first signal representing the identity of the first transmitting unit, and a receiving unit provided with a receiver for receiving the first signal, the receiving unit being adapted to generate a second signal in case the first signal represents the identity of one of said at least one first transmitting unit, the receiving unit being adapted to receive the first signal when the distance between the first transmitting unit and the receiving unit is within a predetermined interval, the first transmitting unit being adapted to operate in a first mode and a second mode, the power consumption of the first transmitting unit when operating in the first mode being lower than the power consumption of the first transmitting unit when operating in the second mode, and the first transmitting unit being adapted to shift from the operation in the first mode to operation in the second mode upon detection of acceleration.