| 摘要 |
PURPOSE:To improve operability by retransmitting signals from a remote control light reception part to a projective display device by using anoptical space transmission/reception unit again. CONSTITUTION:The signal from a remote controller 42 of a VP is received by a light reception part 1, the signal is modulated to a 1MHz band again by a modulation part 2, the output is converted to light by a light transmission part 3, and the light is transmitted to the VP side. When the optical signal is received by a reception part 4 on the VP side, it is converted to an electric signal and outputted to a demodulation part 5. At the demodulation part 5, the remote control signal modulated to the 1MHz band is demodulated so as to return to a base band, and either that signal of a remote control base band signal from a light reception part 6 is selected by a previously decided switching circuit 7 and outputted to a microcomputer. |
