| 摘要 |
PURPOSE:To surely attain the signal communication even at a place having a large rotation swinging by executing the space transmission through a converging diffusing lens with near infrared rays. CONSTITUTION:A signal generated from a work station 5 is E/O-converted by a converter 18 and communicated to a unit U (in casing 20) by a light transmitting line 17. An O/E converter is built in the casing 20, a light signal is converted to an electric signal, and the electric signal is inputted to a light emitting diode which is a light emitting element 21 and the light signal of the near infrared rays is generated to a unit U facing through a diffusing lens 24. A photo diode as a light emitting element 22 built in the casing 20 of the unit U receives the light signal generated from the light emitting element 21 through a converging lens. Since the output of the photodiode is the electric signal, it is converted to the light signal by an E/O converter built in the casing 20 and the signal is communicated to an adjoining tower crane by a light transmitting line 16. Thus, even when a light axis is dislocated a little, the signal transmission is not troubled. |
