| 摘要 |
PROBLEM TO BE SOLVED: To provide an illumination control system in which optimization of power consumption by changing the lighting holding time is possible. SOLUTION: The illumination control system is provided with a lighting circuit 1, which turns on an electric light source to illuminate a prescribed illumination range; a transmission and reception circuit 2 which transmits radio wave to a prescribed detection range of which a part overlaps with the illumination range and receives the radio wave from the detection range; and a signal processing circuit 3, which obtains an intermediate signal, having a frequency corresponding to the change speed of a distance from an object which exists in the detection range from the output of the transmitting and receiving circuit 2 and controls the lighting circuit 1, based on the intermediate signal. The signal processing circuit 3 stores, at the time of control renewal operation for every prescribed time, a peak frequency which is the frequency of a component with largest magnitude in the intermediate signal, each time it is determined as being a human body exists based on the intermediate signal, and based on the transition of the memorized peak frequency, renews the lighting holding time which is a time for continuing lighting of the light source, even when it is not determined that a human body exists, so as to optimize the power consumption. COPYRIGHT: (C)2010,JPO&INPIT
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