| 摘要 |
PURPOSE:To improve the luminous efficiency of a lamp by using a luminous lamp bulb with an inside diameter of 17-22mm. and providing a three bands are earth phosphor film and a reflecting film on the inside surface of the bulb. CONSTITUTION:A fluorescent lamp bulb 1 is formed in a contracted inside diameter of 17-22mm., while a reflecting film 2 comprising halophosphate phosphor is formed on the one side of the inside surface, and a three band rare earth phosphor film 3 comprising europium activated strontium chloroapatite, or the like, ceriumterbium activated yttrium silicate or the like, and europium activated yttrium oxide is formed on the entire inner surface containing the reflecting film 2 of the bulb 1. Thus, the generation efficiency of ultra-violet light is increased by reducing the diameter of the tube, the deterioration caused by 185mm. ultra-violet light is eliminated by using the three band rare earth phosphor, and a fluorescent lamp of extremely high efficiency can be obtained. |
