| 摘要 |
PROBLEM TO BE SOLVED: To easily perform one-to-many communication by transmitting a desired information signal to equipment which emits a light beam by emphasizing and modulating the light beam reflected on a corner cube reflector. SOLUTION: Reception equipment 3A-3E are arranged near the spot to view images and sounds provided by a television camera and a microphone. When laser beams L1A-L1E from a laser diode 10 are sent from the respective reception equipment 3A-3E to transmission equipment 2, these beams are reflected by a corner cube reflector 21 and returned to the respective reception equipment 3A-3E. At such a time, the reflected beam is transmitted through an optical attenuator 22 on the front face of the reflector 21 and modulated by a video signal SV and an audio signal SA and the video signal SV and audio signal GA can be received by the respective reception equipment 3A-3E. Since the incident light is exactly reflected to arriving direction by the reflector 21, the emitting direction of the laser beams L1A-L1E is roughly controlled by the respective reception equipment 3A-3E, the equipment can be easily installed and one-to-multiple communication is enabled. |
