Field emission electron gun having automatic current control

Details Field emission electron gun having automatic current control Field emission electron gun having automatic current control

1974-01-31

1976-02-03

Wilbur, Maynard R.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

250311, 315106, 315107, 315307, 315311, 328 10, H02H 720

Patent

active

039367568

ABSTRACT:
An improved field emission type electron gun is automatically controlled so as to generate a stable emission current. The preferred embodiment employs a detecting means for detecting the emission current fluctuation and a control means for controlling the electric field for field emission according to the output signal of said detecting means.

REFERENCES:
patent: 3377506 (1968-04-01), Banas et al.
patent: 3619717 (1971-11-01), Lee
patent: 3691377 (1972-09-01), Matsui et al.
Crewe, "High Resolution S.E.M.", Scientific American, April, 1971, pp. 26-35.

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