OPTICAL COMMUNICATION EQUIPMENT ON THE PREMISES

PURPOSE:To attain properly transmission and reception of information in a premises by using a projector formed by arranging plural light emitting diodes with a small directing angle closely and using a photodetector formed by arranging plural photodetectors which command different views. CONSTITUTION:The projector A is formed by arranging closely plural light emitting diodes 1 having a small directing angle. Through the constitution above, the luminous quantity is several times that of a single diode 1, and even if the projector A is fixed, sufficient amount of an optical signal is transmitted to the photodetector B. Further, the photodetector B is formed by arranging plural photo diodes 4 in a way, commanding different views. Thus, the optical signal irradiated from the projector A and reflected in a ceiling or a wall is received surely. Then it is possible to put the transmission/control/ supervision of information by means of optical communication in a premises into practical use and this system is used for office automation/factory automation and automatic control.