| 摘要 |
<p>An infrared communications network includes a plurality of infrared transceivers (1, 2) in predetermined fixed locations such as suspended from the ceiling of an office or warehouse, and at least one movable infrared transceiver (4) eg. a computer, producing a beam of infrared radiation which is aimed at one of the fixed infrared transceivers to establish a communications link. For two-way communication, the fixed infrared transceivers illuminate the area therebelow with diverging beams of infrared radiation. To facilitate the aiming of the infrared beam from the movable transceiver, a visible light marker (9) Fig 2 is preferably projected to give an indication of the orientation of the beam. <IMAGE></p> |
