| 摘要 |
PROBLEM TO BE SOLVED: To enable a photocatalytic filter to be enlarged in contact area with air to improve air purifying effect. SOLUTION: The photocatalytic filter 1 wherein a lot of pieces of corrugated cardboards 4 containing titanium oxide are laminated, and by irradiating them with ultraviolet rays of >=381 nm wavelength from an ultraviolet lamp, the titanium oxide contained in the corrugated cardboard 4 is excited to decompose contaminants in air in contact with the corrugated cardboard 4 is constituted so that a lot of pieces of the corrugated cardboard 4 are laminated in an inclined state to expose one surface 5 of each piece of the corrugated cardboard 4 on one end side in the width direction and to expose the other surface 6 of each piece of the corrugated cardboard 4 on the other end side in the width direction. |
