VISIBLE LIGHT CONTROL APPARATUS, VISIBLE LIGHT CONTROL CIRCUIT, VISIBLE LIGHT COMMUNICATIONS APPARATUS, AND VISIBLE LIGHT CONTROL METHOD

摘要

PROBLEM TO BE SOLVED: To provide a visible light control apparatus capable of adjusting the brightness of the visible light to arbitrary brightness.;SOLUTION: The visible light control apparatus comprises a modulation means {equivalent to a PPM signal generation circuit (1), a subcarrier generation circuit (2), and a first AND circuit (4)} that modulates the subcarrier to form a modulation signal, a visible light control means {equivalent to a drive circuit (8)} that controls turning on and off of the visible light, which includes information, based on the modulation signal modulated by the modulation means (1, 2, 4) to make the visible light emitted with a predetermined light emission time ratio, and a light emission time ratio control means {equivalent to a brightness control signal generating circuit (3), an inversion circuit (5), a second AND circuit (6), and an OR circuit (7)} that varies the predetermined light emission time ratio to emit the visible light with a varied light emission time ratio.;COPYRIGHT: (C)2007,JPO&INPIT