| 摘要 |
PURPOSE:To save power consumption by modulating a signal modulated by an inherent code by the modulator of a transmitting part by an output from a control part and after that, outputting it from an antenna. CONSTITUTION:A photocell 7 supplies power E to respective parts in accordance with irradiation Le of an external light source and operates them. In a receiving part 11, a receiving element 8 receives a signal Li modulated by a specific code from the outside and a control part 12 sends the inherent code from a code generating part 13 in accordance with the specific code shown by an output from the receiving part 11. The signal from the control part 12 is modulated by a modulator 15 of a transmitting part 14 and after that, irradiated as a radio waves E0 from an antenna 9 to the outside. |
