| 摘要 |
PURPOSE:To obtain a system at low cost by fixing in advance an light incident means, an light exiting means and a photoelectric converting means, and providing a wavelength selecting means in the middle of the incident light means and the emitted light means. CONSTITUTION:The titled tuner is provided with a glass block 1 having a rotary or slide mechanism, plural band pass filters (BPF) 2 of each different wavelength provided on one plane of the glass block 1, and a means which is opposed to the other plane of the glass block 1 and leads a wavelength light which transmits through the BPF 2, to a photodetector. In such a state, plural wavelength light beams which are applied with wavelength multiplexing are inputted in advance in one plane of the glass block 1 through focusing rod lenses 5, 7 and by moving the glass block 1, an extracted specific wavelength light beam is photodetected through one BPF 2 which is selected. In such a way, the constitution of a receiving part is simplified, and obtained at low cost. |
