Rounded-end protuberances for field-emission cathodes

Details Rounded-end protuberances for field-emission cathodes Rounded-end protuberances for field-emission cathodes

1983-12-08

1985-11-05

Lindsay, Robert

Electric lamp and discharge devices

Electrode and shield structures

Point source cathodes

313304, 313309, A47B 8800

Patent

active

045516499

ABSTRACT:
Protuberances, or posts 14, for field-emission cathodes, the posts 14 having rounded emitting tips 12. Control of the radius R, of the emitting tips 12 controls the factor 10.sup.8 /.beta.V upon which the current density of each post 14 depends. Proper radius selection for a given value of applied voltage, V, keeps the operating point of the cathode 10 on a region of the current density vs 10.sup.8 /.beta.V curve well below the region of impedance collapse, CG.

REFERENCES:
patent: 2636141 (1953-04-01), Parker
patent: 4163918 (1979-08-01), Shelton
patent: 4178531 (1979-12-01), Alig
patent: 4325000 (1982-04-01), Wolfe et al.
patent: 4345181 (1982-08-01), Shelten
IBM Technical Disclosure Bulletin, Cohen et al., S 8746, vol. 20, #9, pp. 3721-3722, 2/1978.

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