公开(公告)号：US06242752B1

公开(公告)日：2001-06-05

申请号：US09117895

申请日：1999-04-16

申请人： Ryuji Soma ,  Hisashi Honda ,  Ariyoshi Ishizaki ,  Tsutomu Watanabe ,  Hiroshi Kamata ,  Akiko Saitou ,  Akimasa Endou

发明人： Ryuji Soma ,  Hisashi Honda ,  Ariyoshi Ishizaki ,  Tsutomu Watanabe ,  Hiroshi Kamata ,  Akiko Saitou ,  Akimasa Endou

IPC分类号： B01J1912

CPC分类号： B01J21/063 ,  B01J35/002 ,  B01J35/004 ,  B01J35/023 ,  C03C17/256 ,  C03C17/3417 ,  C03C2217/71 ,  C03C2218/111 ,  C03C2218/113 ,  C03C2218/365 ,  F21V3/04 ,  H01J61/35 ,  H01K1/32

摘要： A translucent cover (9) is so provided as to cover a high pressure sodium lamp (11) adapted to radiate at least visible light and rays of light in the wavelength range of 300 nm to 400 nm. A photocatalytic film (13) which is capable of preventing generation of interference between visible light is formed on either one of or both the inner side and outer side of the translucent cover (9). The photocatalytic film (13) contains as the principal component titania (TiO2) of which the peak wavelength for visible light transmittance is nearly the same as the peak wavelength for visible light radiated from the high pressure sodium lamp (11). Ultraviolet light radiated from the high pressure sodium lamp (11) enhances oxidation and decomposition of substances performed by the photocatalytic film (13), thereby preventing grime and contaminants from adhering to the translucent cover (9). Even if the thickness of the photocatalytic film (13) is increased in order to make the photocatalytic function more effective, visible light radiated from the high pressure sodium lamp (11) effectively passes through the photocatalytic film (13) at the peak wavelength so that decrease in the illuminating efficiency is prevented.

摘要翻译： 设置半透明盖（9）以覆盖适于辐射至少在300nm至400nm的波长范围内的可见光和光线的高压钠灯（11）。 能够防止在可见光之间产生干涉的光催化膜（13）形成在透光罩（9）的内侧和外侧的任一个或两侧。 光催化膜（13）含有作为主要成分的二氧化钛（TiO 2），其中可见光透射率的峰值波长与从高压钠灯（11）辐射的可见光的峰值波长几乎相同。 从高压钠灯（11）辐射的紫外线增强了由光催化膜（13）进行的物质的氧化和分解，从而防止污垢和污染物粘附到半透明盖（9）上。 即使增加光催化膜（13）的厚度以使光催化功能更有效，从高压钠灯（11）辐射的可见光有效地以峰值波长通过光催化膜（13），使得 防止了照明效率的降低。