Indirectly heated filamentary cathode
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United States of America Patent
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Nov 19, 1991
Grant Date -
N/A
app pub date -
Apr 26, 1989
filing date -
Apr 30, 1988
priority date (Note) -
Expired
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Abstract
An indirectly heated filamentary cathode capable of significantly reducing its resistance, uniformly emitting electrons therefrom and effectively elminating its insulation failure. In the filamentary cathode, a cathode substrate is constituted by a metal conductive layer of a cylindrical shape arranged so as to be contacted with and electrically insulating layer and a fine metal wire wound which are closely contacted together, so that an electron emitting layer may be deposited through the metal conductive layer on the electrically insulating layer.
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