| 摘要 |
PURPOSE:To obtain high-quality discharge lamps without oxidizing ferrite, by burning a sintered ferrite body containing components of a four-element system of LiO, MnO, ZnO, and Fe2O3 as a basic texture, and heat-treating the surface thereof at or below the specified temperature. CONSTITUTION:A sintered ferrite body containing components of four-element system of LiO, MnO, and Fe2O3 as a basic texture is turned in a specified atmosphere. The surface of said ferrite is heat-treated in the air, and a paint is applied on the surface. Thereafter the ferrite core is sealed in a discharge lamp. In this case, the heat treating is performed in the air at or below 460 deg.C. Therefore the ferrite core can be sealed into quartz glass without oxidizing the ferrite core, thereby the high quality discharge lamp can be obtained. |
