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    • 9. 发明授权
    • Thermionic cathode apparatus
    • 热阴极阴极装置
    • US4288717A
    • 1981-09-08
    • US91860
    • 1979-11-06
    • Hiroaki TanjiMitsuaki SaitoMasaji Ishii
    • Hiroaki TanjiMitsuaki SaitoMasaji Ishii
    • H01J1/16H01J19/10
    • H01J1/16
    • A thermionic cathode includes an electron emitting tip, lanthanum hexaboride tip supporting heaters in close contact with both sides of the tip and supporting the tip, and elastic electroconductive members in pressure contact with outer surfaces of the tip supporting heaters for supplying electric current. The tip supporting heaters are obtained by cutting lanthanum hexaboride having high anisotropy due to its layered structure so as to form a pair of parallel planes perpendicular to a pressing direction when hot-pressed, and abrade-polishing the parallel planes. The tip supporting heaters are brought into close contact with the tip and the elastic electroconductive members at the resulting smooth surfaces thereof. The apparatus of the invention has a prolonged lifetime and high efficiency.
    • 热离子阴极包括电子发射尖端,六硼酸镧尖端,支撑与尖端的两侧紧密接触并支撑尖端的加热器,以及与用于提供电流的尖端支撑加热器的外表面压力接触的弹性导电构件。 尖端支撑加热器是通过切割由于其分层结构而具有高各向异性的六硼化镧而获得的,以便在热压时形成垂直于挤压方向的一对平行平面,并且研磨平行平面。 尖端支撑加热器在其所得到的平滑表面与尖端和弹性导电构件紧密接触。 本发明的装置具有延长的使用寿命和高效率。