PROBLEM TO BE SOLVED: To enhance efficiency of acquiring air cleaning action by radiating ultraviolet light to a photocatalyst.SOLUTION: When ultraviolet light of an ultraviolet light LED 23 of a light source module 7 is irregularly reflected on a light diffusion device 27 and radiated to a front face 11 of a photocatalyst panel 3, a photocatalyst adhered to a surface (especially front face 11 and inner wall face of pore 9) of the photocatalyst panel 3 generates chemical reaction, and organic matters and microbes existing in the air on a front side of a casing 5 where the front face 11 of the photocatalyst panel 3 is exposed through an opening 19 are decomposed, and the air in the vicinity of the front face 11 of the photocatalyst panel 3 is purified. At the time, the front face 11 of the photocatalyst panel 3 is exposed to a front side of the photocatalyst panel 3 through the opening 19 of the casing 5, so that, the air in the vicinity of the front face 11 of the photocatalyst panel 3 can secure flow ability. In addition, especially a decorative part 13 on the photocatalyst panel 3 is heated with white light of a white LED 25 having a wavelength longer than a wavelength of the ultraviolet light of the ultraviolet light LED 23, therefore flow ability of the air in the vicinity of the front face of the photocatalyst panel 3 is increased.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2020,JPO&INPIT【課題】光触媒に紫外光を照射して空気清浄作用が得られる効率を高める。【解決手段】光源モジュール７の紫外光ＬＥＤ２３の紫外光が、光拡散デバイス２７において乱反射されて光触媒パネル３の前面１１に照射されると、光触媒パネル３の表面（特に前面１１や細孔９の内壁面）に付着した光触媒が化学反応を起こし、開口部１９を介して光触媒パネル３の前面１１が露出する額縁５の前方の空気中に存在する有機物や細菌等が分解され、光触媒パネル３の前面１１付近の空気が浄化される。このとき、光触媒パネル３の前面１１は額縁５の開口部１９を介して光触媒パネル３の前方に露出しているので、光触媒パネル３の前面１１付近の空気には流動性が確保される。また、紫外光ＬＥＤ２３の紫外光よりも波長が長い白色ＬＥＤ２５の白色光で光触媒パネル３の特に加飾部１３が加熱されて、光触媒パネル３の前面付近の空気の流動性が増す。【選択図】図１
