Indirectly heated filamentary cathode

Details Indirectly heated filamentary cathode Indirectly heated filamentary cathode

1989-04-26

1991-11-19

Yusko, Donald J.

Electric lamp and discharge devices

Electrode and shield structures

Indirectly heated cathodes

313 27, H01J 124

Patent

active

050668854

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.

REFERENCES:
patent: 2075122 (1937-03-01), Loewe et al.
patent: 3206329 (1965-09-01), Hickle
patent: 4100449 (1978-07-01), Gange

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