发明名称 FLUORESCENT LAMP
摘要 PURPOSE:To prevent any discoloration of a fluorescent lamp resulting from its prolonged lighting by coating the inner surface of a glass bulb with a fluorescent layer prepared from a mixture of a rare earth phosphor and beta type calcium pyrophosphate having a particle size similar to that of the rare earth phosphor. CONSTITUTION:First, strontium calcium chlorophosphate phosphor activated with europium, lanthanum phosphate phosphor activated with cerium and terbium and yttrium oxide phosphor activated with europium are mixed in a ratio of 2 to 4 to 4 to prepare a rear earth phosphor. Next, 100pts.wt. of the rare earth phosphor is mixed with 10-60pts.wt. of beta type calcium pyrophosphate having a particle size similar to that of the rare earth phosphor. After that, the thus prepared mixture is applied to the inner surface of a glass bulb to form a fluorescent layer, thereby making a fluorescent lamp. The use of calcium pyrophosphate with beta type crystalline structure prevents any undesirable discoloration from developing even when the lamp is lit over a long time. Besides, it is possible to achieve improved efficiency of applying the fluorescent layer.
申请公布号 JPS61135042(A) 申请公布日期 1986.06.23
申请号 JP19840258098 申请日期 1984.12.05
申请人 NEC HOME ELECTRONICS LTD 发明人 URATA YOSHIZO;OSONO TORU
分类号 C09K11/02;H01J61/46;(IPC1-7):H01J61/46 主分类号 C09K11/02
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