| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a lighting device for visible light communication in which visible light emitted from a simple and practically useful light-emitting device as white light illumination is utilized for communication. <P>SOLUTION: The lighting device has a light emission control unit 13 which generates a modulation electrical signal for transmitting information; a light-emitting device 21 comprising an LED chip which radiates intensity-modulated exciting light in response to the modulation electrical signal, a phosphor which absorbs the exciting light and radiates blue light in a fluorescent manner, and a phosphor which absorbs the exciting light and radiates, in a fluorescent manner, yellow light of which a 1/10 afterglow time is short in comparison with blue light, and which is composed with the blue light to become illuminating light; and a light-receiver 17 capable of receiving the yellow light. <P>COPYRIGHT: (C)2007,JPO&INPIT |
