| 摘要 |
PURPOSE:To apply high reliability data transmission by adoting the optical communication system and utilizing a light source as a light source so as to decide easily the installing position of the receiver. CONSTITUTION:A data sent from a data transmitter 2 is inputted to a modulator 8 and the modulator 8 modulates the power supply fed to the lighting device 5 according to the sent data. AM or FM modulation system is applied. The receiver 6 detectingthe intensity of light or spectrum detects the light lighted from the lighting device and demodulates a signal. In adopting a sufficient fast modulation speed, the light quantity or spectrum change is not sensed by human eyes. Since the luminous amount itself is viewed by the eye, the reception state of the installed position of the receiver 6 is discriminated easily. |
