| 摘要 |
PURPOSE:To transmit information even when a shield object exists between a transmitter and a receiver by providing plural light emitting elements provided to the transmitter in a limited space or plural photodetectors provided to the receiver and arranging the plural elements at intervals. CONSTITUTION:When a shield object 7 exists between the transmitter 1 where light emitting elements 2, 3, 4 such as light emitting diodes are arranged at prescribed intervals and the receiver 5 where a photodetector 6 such as a photodiode is provided, a reflecting object 8 such as a wall, a floor or a ceiling exists in a limited space. The straight forward optical path 9 of the light emitting elements 2-4 to the photodetector 6 is shut by the shield object 7, but the light 10 from the light emitting elements 3, 4 is reflected in the reflecting object 8, made incident in the photodetector 6 to attain transmission of information. |
