| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical receiver capable of facilitating optical axis alignment and attaining high speed optical communication by a narrow beam. <P>SOLUTION: A phosphor plate 22 whose surface is bonded with a phosphor 22a for emitting light by stimulation of infrared ray is located to a light receiving window for receiving an infrared ray signal light 16. The signal light 16 is transmitted through a circular window not coated with the phosphor. The signal light 16 is transmitted through the window and collected by a light receiving unit 26 such as a photodiode by a lens 24. The light receiving unit 26 converts the infrared ray signal light into an electric signal. A demodulation circuit 28 demodulates data from an output electric signal of the light receiving unit 26. A signal processing apparatus 30 detects the strength of the output electric signal from the light receiving unit 26 and displays the strength level on a screen of a display apparatus 32. Further, the signal processing apparatus 30 generates a digital acoustic signal for expressing the strength level of the output electric signal from the light receiving unit 26 in terms of the loudness or the strength of sound. The digital acoustic signal is applied to a speaker 36 via a D/A converter 34. <P>COPYRIGHT: (C)2008,JPO&INPIT |
