| 摘要 |
PROBLEM TO BE SOLVED: To provide a lighting system of low cost which is easy for maintenance check without anxiety of an electric shock. SOLUTION: A drainage side ditch 30 is provided which receives overflowed water 15 overflowing beyond the surface of an impounded water structure 20 in the peripheral part of the impounded water structure 20 which stores pool water 10. A fiber inserting hole 25 is provided which passes though from a position sank in the pool water 10 into the inside of the drainage side ditch 30 in the impounded water structure 20. A light output end 52 of an optical fiber 50 is inserted into the fiber inserting hole 25. A light input end 54 of the optical fiber 50 is discharged through the drainage side ditch 30 and connected with a light source box 60 for light injection. In this way, the drainage side ditch 30 is used for construction of the optical fiber 50, reducing the cost. |
