| 摘要 |
PROBLEM TO BE SOLVED: To heighten accuracy of processing a cathode, without deteriorating electron emitting performance of the cathode, and to prevent heat local accumulation in the cathode. SOLUTION: A housing chamber 32, the tip side of which is open, is provided at the tip part of a cathode body 31, at least an easily emissive material powder 33a which has been powdered is filled at the bottom side of the housing chamber 32, tungsten powder or granular tungsten sintered body 34a is filled at the tip side of the housing chamber 32, they are heated at a temperature higher than the fusing temperature of the easily emissive material, and a porous sintered body 34 impregnated with the melt of the easily emissive material powder 33a is formed on the tip side. COPYRIGHT: (C)2006,JPO&NCIPI
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