Field emission gun electrode geometry for improved focus stabili

Details Field emission gun electrode geometry for improved focus stabili Field emission gun electrode geometry for improved focus stabili

1984-04-16

1987-09-22

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315383, H01J 2958, H01J 2952

Patent

active

046957731

ABSTRACT:
In field emission systems having beam current regulation by use of modulating field strengths from a control or Wehnelt electrode adjacent the emission electrode, the varying field strengths produce a focus instability of the emitted beam. By the precise spacing of the emission tip, Wehnelt electrode and first accelerating electrode, and by the precise aperture diameters of the Wehnelt and first accelerating electrodes, the beam focus remains stabilized for modulating field strength variations.

REFERENCES:
patent: 3046442 (1962-07-01), Cook
patent: 3275867 (1966-09-01), Tsuchimoto
patent: 3890533 (1975-06-01), Tanaka
patent: 4274035 (1981-06-01), Fukuhara et al.
patent: 4467243 (1984-08-01), Fukushima et al.

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