| 摘要 |
PROBLEM TO BE SOLVED: To provide a photocatalytic cleaning device which resolves cleaning capacity unevenness.SOLUTION: Hollow tubes 3-1, 3-2 having same inner diameter and outer diameter are arranged in a longitudinal direction between an inner tube 1 and an outer tube 2 formed of light guide bodies. Photocatalyst layers 4 are formed on at least inner circumference surfaces of the respective hollow tubes 3-1, 3-2. An excitation light source 5 for exciting the photocatalyst layer 4 is arranged on an inner tube 1 side. A reflective layer 6 for reflecting and trapping excitation light L from the excitation light source 5 effectively in a device is formed on the outer circumference surface of the outer tube 2. As a distance from an excitation light incident part P facing to the excitation light source 5 is small, the hollow tubes 3-1 are tightly arranged. As a distance from the excitation light incident part P is large, the number of the hollow tubes 3-2 is smaller than that of the hollow tubes 3-1. That is, as the distance from the excitation light incident part P increases, distribution of the photocatalyst layers 4 of the hollow tubes 3-1, 3-2 changes by reducing density of the hollow tubes at the distance. |
