| 摘要 |
PURPOSE:To make the movement of installing place of a terminal device easy and to protect human eyes from optical signals, by performing communication between an optical transmitter/receiver provided at the lower part of a terminal device and an optical transmitter/receiver provided on the wall of a room by means of optical signals. CONSTITUTION:The lower part of a terminal device T installed at an arbitrary position of an office 1 is provided with an optical transmitter/receiver SR. The lower part of a wall surface 3 of the office 1 is provided with many satellites S1-S9 including a light emitting element and a photodetector. Communication is performed by using a diffused light between the SR and the satellites S1- S9. Since the optical path of the light is formed along the floor, no light is made incident to a man in error. Further, even if an optical path of a certain part is intercepted by a pedestrian, the optical communication is continued with the optical paths of the other parts. |
