| 摘要 |
PURPOSE:To obtain a lamp having long service life, by constructing the electrode with an inside coil wound more than triple around the electrode core and adhered with electron emission substance and an outside coil wound more than double and not adhered with electron emission substance while projecting the electrode core further than the tip of the outside coil. CONSTITUTION:The light emission tube 1 is encapsulated with sodium, metal for buffer gas and rear gas for assisting the start. The electrodes 6, 7 are constructed by winding a double coil 9 2-5 turns tightly at the section A over the electrode core 8 then wunding over the central position while holding predetermined distance from the core 8 to provide a space between the core 8 and the coil 9. The tip of the core 8 is projected by 1-2mm. over the tip of the coil 9. The inside coil 10 of more than triple coil pre-adhered with electron emission substance is inserted completely into the space provided between the coil 9 and the core 8. The tip of the coil 9 is bent inwardly to choke the opening between the coil 9 and the core 8 to prevent the exposure of the electron emission substance during discharge. Consequently the service life of lamp can be prolonged. |
