Thermal field emission cathode

Details Thermal field emission cathode Thermal field emission cathode

1993-06-24

1995-09-12

Brinich, Stephen

Electric lamp and discharge devices

With positive or negative ion acceleration

Supplying ionizable material

313336, H01J 2700

Patent

active

054499682

ABSTRACT:
A thermal field emission cathode comprises a needle-like electrode of single crystal tungsten having an axis direction of <100> provided with a coating layer of zirconium and oxygen; a heater for heating the needle-like electrode; a suppressor electrode; and a supply source for supplying zirconium and oxygen having zirconium of not less than 3.0.times.10.sup.-6 g and not more than 10.times.10.sup.-6 g by weight to the coating layer disposed on the needle-like electrode in a range between a point apart from a junction of the needle-like electrode and the heater by 200 .mu.m in a direction of a distal end of the needle-like electrode and a plane including an outer surface of the suppressor electrode.

REFERENCES:
patent: 4324999 (1982-04-01), Wolfe
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patent: 4379250 (1983-04-01), Hosoki et al.
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patent: 4629931 (1986-12-01), Clark, Jr. et al.
patent: 4631448 (1986-12-01), Tamura et al.
patent: 4983845 (1991-01-01), Liebl
patent: 4994711 (1991-02-01), Matossian
patent: 5034612 (1991-07-01), Ward et al.
Wolfe, J. E. Operational Experience with Zirconiated T-F Emitters. Technology Center, Burroughs Corp.: San Diego, Calif., 92127. Sep. 28, 1979. pp. 1704-1708.

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