Apparatus for mounting a field emission cathode

Details Apparatus for mounting a field emission cathode Apparatus for mounting a field emission cathode

1985-05-09

1987-08-18

DeMeo, Palmer C.

Electric lamp and discharge devices

With electrode replacement means or demountable

313278, H01J 120, H01J 130

Patent

active

046879641

ABSTRACT:
A field emission cathode 12 is positioned in a pair of intersecting cross grooves 30, 32 in the end of a ceramic tube 14 by a metal end cap 24. A spring 34 in electrical contact with the base of the cathode provides the necessary pressure to maintain continuous circumferential electrical contact between the gate film and a raised edge 38 on the end cap. With this structure the cathode chip is self-centering and easily replaceable. Also the gate film of the cathode is not abraded or rubbed during installation, and the holder is readily degassed.

REFERENCES:
patent: 2542639 (1951-02-01), De Walt
patent: 2656480 (1953-10-01), Corbell et al.
patent: 2889478 (1954-06-01), Rogers
patent: 3403281 (1968-09-01), Weaver
patent: 3566179 (1971-02-01), Kumpfer
patent: 3662209 (1972-05-01), Beggs
patent: 3727093 (1973-04-01), Fink

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