| 摘要 |
PURPOSE:To prevent any breakage of the glass bulb and any burning of the stabilizer which might occur in the last stage of the life of a high pressure electric-discharge lamp by properly selecting the structure and dimensions of a highly-dielectric ceramic capacitor which constitutes a starter. CONSTITUTION:In order to prevent the electrostatic radiation of electrons, the electric field of the electrode film surface is decreased by coating the base body of a ceramic capacitor 2 with a material having a higher electric constant than the base body. During the usual lighting of a high pressure electric-discharge lamp, any electric discharge in the ceramic capacitor 2 can be prevented by properly selecting the distance between the periphery of silver film electrodes 8a and 8b and the periphery of a ceramic base plate, the thickness of a highly-dielectric crystalline glass film and several factors including the partial pressure of xenon gas in the internal atmosphere. Owing to the above constitution, it is possible to prevent any breakage of the glass bulb and any burning of the stabilizer which might occur in the last stage of the life of the lamp. |
