| 摘要 |
PURPOSE:To eliminate the need for the high-level output for a light source of a satellite device and to secure the receiving level to protect a human body, by reflecting the light beam emitted to right above from a light source of a terminal device by a reflecting plate set above a private optical space and then making the light beam incident to the satellite device. CONSTITUTION:A hemispherical photodetecting element array 7 containing a hemispherical surface 8 and a photodetecting element 9 as well as a light source 6 are connected to a terminal device 2. Then the light beam given from the light source 6 is reflected by a reflecting plate 3 hung from a ceiling 4 and then made incident to a satellite device 1. The diffusing light emitted from the device 1 is reflected at the ceiling 4 and a wall 5 and made incident to the array 7 of the device 2. Then the reflected light is received by each element 9. Thus the photodetecting area is equivalently increased to improve the detecting effect. This can eliminate the high-level output for the device 1, and a result a receiving level secured to reduce the effect to a human body. |
