| 摘要 |
PURPOSE:To increase luminous efficiency of a fluorescent lamp by arranging a film which reflects ultraviolet rays and transmits visible rays between an outer tube of fluorescent lamp and fluorescent material. CONSTITUTION:A film 3 which reflects ultraviolet rays and transmits visible rays is arranged between an outer tube 1 of fluorescent lamp and fluorescent material 2. Most of ultraviolet rays generated by discharge in the lamp are absorbed in the fluorescent material 2 and converted into visible rays but part of ultraviolet rays transmits the fluorescent material 2. These transmitted ultraviolet rays are reflected by the film 3 and emitted again to the fluorescent material 2 to convert into visible rays. Therefore, ultraviolet rays which was wastefully absorbed in the outer tube 1 so far are effectively utilized and luminous efficiency of fluorescent lamp is increased. |
