Patent ID: 8058819
Filing Date: 2011-11-15
Classification: H05B,Y02B

Abstract:
1. An illumination system comprising: a plurality of illumination devices; and a number of sensor blocks, each of the sensor blocks including: an active sensor for detecting a moving object traveling within a detection area thereof; a first and a second amplifier circuit for dividing a detection signal transmitted from the active sensor into a first and a second frequency band and for amplifying signal components of the frequency bands; a first and a second judgment unit provided in a one-to-one relationship with the amplifier circuits for, based on the amplified signal components of the frequency bands provided from the amplifier circuits, judging whether the moving object is travelling at a travel velocity corresponding to any one of the frequency bands; a first and a second timer provided in one-to-one relationship with the judgment units for counting turn-on durations of the illumination devices based on results of the judgment units; and a control unit for performing a turn-on control on at least one of the illumination devices based on judgment results made by the judgment units and results of time count of the timers, wherein the frequency band of the second amplifier circuit covers the entire frequency band of the first amplifier circuit.