OPTICAL SPACE TRANSMISSION SYSTEM

摘要

PURPOSE:To evade the signal transmission impossible state by the interception of an optical signal by mounting a transmission and reception part transmitting and receiving at least the optical signal of a transmission and reception device on a supporting part which is freely adjustable in its height. CONSTITUTION:A satellite device 3 is installed in the corner part of a ceiling and each transmission and reception device 2 performs the transmission and reception of optical signals between these satellite devices 3. The reason why the satellite device 3 is installed in the corner part of the ceiling in this way is that a directional angle is required to be widened when the device 3 is installed at the center of the ceiling but device 3 is capable of covering all the indoor areas even by a comparatively narrow directional angle when the device 3 is installed in the corner of the ceiling. In this case, the load of an optical lens assisting the directional angle characteristic of the satellite device 3 can be reduced. In the transmission and reception device 2 connected with a terminal device 1 such as a personal computer a printer, at least a trnamission and reception part 2a is mounted on a stretchable pole-like supporting part 4. Therefore, the height of the transmission and reception part 2a can be adjusted by the elongation and contraction of the supporting part 4 and light-shielding can be evaded.