| 摘要 |
PURPOSE:To prevent formation of a glass in a glass bulb even if a phosphor which is easily converted into glass is used by forming a separating layer between a glass bulb and a luminescent layer with fine particles of ultraviolet ray reflection material which is difficult to be converted into glass. CONSTITUTION:A separating layer is formed between a glass bulb and a luminescent layer with fine particles of ultraviolet ray reflection material which is difficult to be converted into glass. In a fluorescent lamp, if a phosphor which is easily converted into glass such as europium activated strontium phosphate is contained in a luminescent layer, the phosphor tends to be converted into glass in backing process. That results in generation of distortion and cracks of the bulb in a manufacturing process. By forming the separating layer between the glass bulb and the luminescent layer, even if glass is formed, it does not directly contact the glass bulb. Therefore, generation of distortion and cracks of the bulb is prevented. |
