H - Electricity – 01 – J
Patent
H - Electricity
01
J
353/11, 313/162
H01J 19/54 (2006.01) H01J 3/02 (2006.01)
Patent
CA 1065386
ABSTRACT OF THE DISCLOSURE An electron tube of the type, such as a traveling-wave tube, which includes a cylindrical ceramic envelope part jointed to two spaced metallic electrodes between which a high D.C. voltage is applied is disclosed. The ceramic part has its inner diameter progressively increased so that its inner circumferential surface is flared from the end at which the negative potential electrode is jointed towards the end at which the positive po- tential electrode is jointed. Because electrons emitted from the cathode of the tube are less likely to impinge on this sloping surface, arc gener- ation is reduced or prevented. Additionally, a metallic shield connected concentrical b to the negative electrode is provided, the shield being so spaced with respect to the positive electrode that it concentrates the field between the two electrodes at the shield. This weakens the field at the periphery of the negative electrode and causes reduced emission of electrons at that location.
264451
Kawashima Fujio
Orui Ryuzo
Nippon Electric Co.
Nippon Telegraph And Telephone Public Corporation
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