| 摘要 |
PROBLEM TO BE SOLVED: To reliably increase downlink communication capacity of an optical beacon having an optical communication function and a vehicle detection function.SOLUTION: The present invention relates to an optical beacon 1 equipped with a beacon head 3 having a first light emitter/receiver unit 8 for optical communication and a second light emitter/receiver unit 9 for detecting vehicles. The first light emitter/receiver unit 8 includes a first light emitter section 42 for emitting downlink light DO to a downlink area DA located toward the upstream side of the beacon head 3, and a first light receiver section 43 for receiving uplink light UO emitted from a vehicle C. The second light emitter/receiver unit 9 includes a second light emitter section 45 for emitting incident light IO to an incident area B located at downstream of the downlink area DA, and a second light receiver section 46 for receiving reflection RO of the incident light IO. Direction V1 of the incident light IO emitted by the second light emitter section 45 is inclined toward the downstream side with respect to a vertical direction. |
