| 摘要 |
PURPOSE:To prevent the receiving of noise due to the light from lighting equipment, etc., without being affected by the setting condition by providing a variable volume for adjusting the frequency of the tuning circuit of a band-pass filter and adjusting the air cleaner from outside. CONSTITUTION:A light signal from a remote-control transmitter 4 is received by a photodetector 5 and transduced into an electric signal. The noise of the electric signal outputted from the photodetector 5 is received by a band-pass filter 6. A variable volume 10 for adjusting the tuning frequency of the filter 6 is provided to adjust the air cleaner from outside. Consequently, reliability is improved without being affected by the setting condition and without receiving noise due to the light from lighting equipment, etc. |
