| 摘要 |
PURPOSE:To prevent any irregular flickering by attaching bar-like auxiliary electrodes, the protruding ends of which have a diameter of at most a given length and which protrude into the electric discharge space by at least a given distance. CONSTITUTION:An electric discharge electrode 8 having a tungsten coil filament 7 coated with an electron-emitting substance, is fused to each of a tubular glass bulb the inner surface of which is coated with a phosphor film. The electrode 8 consists of lead wires 9 and 9, the filament 7 attached across the wires 9 and 9 and bar-like auxiliary electrodes 10 and 10. The protruding end 11 of the auxiliary electrode 10 has a diameter (d) of at most 0.6mm. (ex., 0.4mm.) and is apart from the central axis of the filament 7 toward the electric discharge space by a distance of at least 4mm. (ex., 7mm.). Owing to the above structure, it is possible to prevent any irregular flickering which frequently occured at the point when a conventional fluorescent lamp has been lit for about 1,000hr. |
