| 摘要 |
PURPOSE:To prevent damage such as fusion due to a temperature rise of an optical transmission line for transmitting light energy by arranging the optical transmission line in a cooling pipe and cooling this optical transmission line by a cooling medium. CONSTITUTION:A photodetecting plate 1 for the sunshine is installed in a dome charged with cutting agents for infrared rays and ultraviolet rays, and this dome 2 is fitted to an automatic sunshine tracking device 3. This photodetection plate 1 is provided with numbers of condenser lenses 4, and converged light energy is sent to the optical transmission line 5 and guided to an optical changeover matching device 6. Further, an auxiliary transmission line 8 for guiding light energy from an artificial light source 7 is provided on the input side of the device 6 and a leak light transmission line 10 for supplying the light energy to plants to be cultivated. This leak light transmission line 10 is laid over the entire area of hydroponics. Further, the cooling pipe 15 is fitted around the optical transmission line 5 to prevent the temperature of the optical transmission line 5 from rising above a specific value through a pump 16 for supplying cooling water, cooling water supply path 17, and throttle valve 18. |
