Method for manufacturing thermionic cathode
 A method for manufacturing a thermionic cathode is provided which comprises cutting a bar from a multi-layer structure having a first layer of thermoelectron emissive compound and a third layer of metal of high melting point, a second layer of reaction barrier being interposed between said first and third layers, the bar being cut in a direction substantially perpendicular to that of the layers, sharpening the end of the first layer of the bar and then providing current terminals with the third layer of the bar. According to the method of the invention, a thermionic cathode capable of emitting stable electron beams of high intensity for a long period of time can be manufactured. 
Denki Kagaku Kogyo Kabushiki Kaisha
H H
H01J H01J
inventional inventional
Shuzo Akira Hideo Masaji
Watanabe Miyai Hiraoka Ishii