INFRA-RED TRANSMIT/RECEIVE UNIT FOR OMNIDIRECTIONAL TRANSMISSION IN HORIZONTAL DIRECTION,AND INFRA-RED COMMUNICATION SYSTEM PROVIDED WITH A NUMBER OF SAID UNITS

摘要

Infra-red communication system in which messages in the form of pulse-coded data signals are transmitted and exchanged between transmit/receive units which are each provided with infra-red light-emitting elements and infra-red light-sensitive photoelements. The message transmission is used for controlling vehicle movements for transporting goods or personnel in a particular area. To this end such a transmit/receive unit is provided on top of or underneath of each vehicle and one or more permanently installed such transmit/receive units are provided above the ground in the area itself. Each transmit/receive unit consists of a transparent tube to be installed vertically which is provided with at least one transmit platform (10) with a large number of light-emitting diodes and one receive platform (11) with one or more photodetectors for transmitting and receiving omnidirectionally in the horizontal direction.