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    • 3. 发明公开
    • Cathode ray tube having an improved cathode
    • Kathodenstrahlröhremit verbesserter Kathode
    • EP1061543A3
    • 2003-08-13
    • EP00111884.3
    • 2000-06-09
    • Hitachi, Ltd.
    • Koizumi, Sachio, Hitachi, Ltd., Intell. Prop. G.Komiya, Toshifumi, Hitachi, Ltd., Intell. Prop. G.Iwamura, Norio, Hitachi, Ltd., Intell. Prop. G.
    • H01J1/142
    • H01J1/142
    • A cathode ray tube is provided with a phosphor screen (14) and an electron gun (19) including a cathode (40) having an electron-emissive material layer (42) formed on a surface of a cathode base metal (41). The electron-emissive material layer includes a first layer (421) made of an alkaline earth metal oxide on the surface of the cathode base metal, a second layer (422) on a surface of the first layer which is an alkaline earth metal oxide layer containing at least one rare earth metal oxide in a range of 0.1 to 10 weight percent, the at least one rare earth metal oxide having a specific particle size distribution. The cathode base metal is made chiefly of nickel and containing at least one reducing agent, and a thickness of a portion of the cathode base metal in contact with the electron-emissive material layer is in a range of 0.10 to 0.16 mm.
    • 阴极射线管设置有荧光屏(14)和电子枪(19),电子枪(19)包括阴极(40),阴极(40)具有形成在阴极基底金属(41)的表面上的电子发射材料层(42)。 电子发射材料层包括在阴极基体金属的表面上由碱土金属氧化物制成的第一层(421),在作为碱土金属氧化物层的第一层的表面上的第二层(422) 含有0.1-10重量%范围内的至少一种稀土金属氧化物,所述至少一种稀土金属氧化物具有特定的粒度分布。 阴极基体金属主要由镍制成并含有至少一种还原剂,阴极基体金属与电子发射材料层接触的部分的厚度在0.10至0.16mm的范围内。