| 摘要 |
PURPOSE:To eliminate a signal interference between each optical transmitter, which is generated in a specified position on a locus of a moving body, by providing a variable delay device for bringing a line equivalent length to a variable adjustment. CONSTITUTION:Lengths of transmission lines 42a-42c extending from an information signal transmitting source 40 to each optical transmitter 35a-35c are different from each other, and also there is a difference between a distance extending from the optical transmitters 35b, 35c to a point R on the locus A of the moving body and a distance extending from the optical transmitters 35a, 35b to a point Q. Therefore, a time difference is generated in the respective both signals reaching the point R or the point Q, and an interference is caused, therefore, by controlling variable delay devices 41a-41c, the length of the transmission line if brought to a variable adjustment. In this way, the arrival time difference of both the signals in the point R or the point Q can be eliminated substantially, and the interference of both signals can be prevented. |
