COIL ELECTRODE FLUORESCENT ELECTRIC-DISCHARGE LAMP PIPE

摘要

In a coil electrode fluorescent electric-discharge lamp pipe (1), a fluorescent film (8) is formed on the inner surface of a glass pipe (2) on positions to which coil electrodes (3, 4) are opposed. The pipe (1) can use the entire glass pipe (2) as a fluorescent electric-discharge region. The pipe (1) can provide illumination with high light intensity. The coil electrodes (3, 4) are constituted by forming an insulating coating electric wire in which the periphery of an electric wire (9) is covered with an insulating layer (10) in the shape of a winding, and consequently the electric wire (9) for the electrode is wounded on the glass pipe (2) via the insulating layer (10) and an electric-discharge phenomenon never occurs between the electric wire (9) and the surface of the glass pipe (2). This prevents reduction in the life of the fluorescent electric-discharge lamp pipe caused by a pinhole formed by the electric-discharge phenomenon. Thus, the long life of the fluorescent electric-discharge lamp pipe can be achieved. Further, the long life is achieved since an illumination efficiency is not deteriorated, and significant power saving can be realized under efficient power consumption.