Dual cathode system for electron beam instruments

Details Dual cathode system for electron beam instruments Dual cathode system for electron beam instruments

1987-08-11

1989-07-11

Anderson, Bruce C.

Radiant energy

With charged particle beam deflection or focussing

Magnetic lens

250396R, 250310, 21912128, H01J 302

Patent

active

048475025

ABSTRACT:
An electron beam source having a single electron optical axis is provided with two coplanar cathodes equally spaced on opposite sides from the electron optical axis. A switch permits selecting either cathode, and a deflection system comprised of electromagnets, each with separate pole pieces equally spaced from the plane of the cathodes and electron optical axis, first deflects the electron beam from a selected cathode toward the electron optical axis, and then in an opposite direction into convergence with the electron optical axis. The result is that the electron beam from one selected cathode undergoes a sigmoid deflection in two opposite directions, like the letter S, with the sigmoid deflection of each being a mirror image of the other.

REFERENCES:
patent: 2436676 (1948-02-01), Smith et al.
patent: 3565438 (1971-04-01), Pease
patent: 3659236 (1972-04-01), Whitehead, Jr.
patent: 4209698 (1980-06-01), Hoppe
patent: 4426583 (1984-01-01), Chang et al.
patent: 4438336 (1984-03-01), Riecke
patent: 4479060 (1984-10-01), Tamura et al.
patent: 4593196 (1986-06-01), Yates

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