Electron gun

Details Electron gun Electron gun

1980-09-23

1982-12-14

Dixon, Harold A.

Electric lamp and discharge devices

Electrode and shield structures

Cathodes containing and/or coated with electron emissive...

313326, H01J 114

Patent

active

043639950

ABSTRACT:
An electron gun having a cathode of a lanthanum hexaboride single crystal is disclosed in which the axis of the cathode is set to such a crystal orientation that the electron beam has two intensive emission regions which are asymmetrical with each other in intensity. In the electron gun, even at a low heating temperature of the cathode, a single spot of an image by the electron beam of a more intensive emission region since the electron beam of a weaker intensity emission region is blocked by an aperture.

REFERENCES:
patent: 3284657 (1966-11-01), Weissman
patent: 4054946 (1977-10-01), Ferris et al.
patent: 4137476 (1979-01-01), Ishii et al.
patent: 4260525 (1981-04-01), Olsen et al.
"Design & Optimization . . . Instruments" by Schmidt et al. J. Vac. Sci. Tech. 15(4) Jul./Aug. 1978, pp. 1554-1560.

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