| 摘要 |
A cathode structure of a thermal electron emitting cathode of an electron tube, particularly of a magnetron for preventing the damage and break due to mechanical vibration of the cathode. A spacer is interposed in a space between a center lead and a lower end shield to prevent the vibration through the center lead. The antivibration effect of the filament cathode is attained by arranging the spacer having an aperture through which the center lead and a side lead extend such that the spacer contacts to an inner wall of a shielding member which constitutes a portion of a vacuum envelope of the magnetron.
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