OPTICAL BEACON VEHICLE SENSING OPTICAL MODULATION CIRCUIT

PROBLEM TO BE SOLVED: To provide a sensing infrared modulation circuit for generating sensing infrared that does not disturb communication infrared when the communication infrared and the sensing infrared are simultaneously received, and to provide an optical beacon using the sensing infrared modulation circuit.SOLUTION: A sensing infrared modulation circuit is for an optical beacon that is placed high, radiates the sensing infrared and communication infrared, senses a vehicle situated downward and communicates with the vehicle. When the sensing infrared and part of the communication infrared are radiated so that they overlap with each other at a position where the vehicle passes and the sensing infrared and the communication infrared are simultaneously received, the sensing infrared modulation circuit modulates the sensing infrared so that it does not disturb communication by the communication infrared. 【課題】通信用赤外線と感知用赤外線を同時に受光する際の感知用赤外線による通信用赤外線への妨害の無い感知用赤外線の変調回路及びこれを用いた光ビーコンを提供する。【解決手段】高所に置かれ感知用赤外線及び通信用赤外線を発光して下方に位置する車両の感知及び該車両との通信を行う光ビーコンの、感知用赤外線の変調回路であって、前記感知用赤外線及び前記通信用赤外線の一部が前記車両の通過する位置で重複するように発光され、前記感知用赤外線及び前記通信用赤外線が同時に受光された際に前記感知用赤外線が前記通信用赤外線による通信を妨害しないように変調する感知用赤外線の変調回路。【選択図】図１