Multi-emitter electron gun of a field emission type capable of e

Details Multi-emitter electron gun of a field emission type capable of e Multi-emitter electron gun of a field emission type capable of e

1996-02-23

1998-02-10

O'Shea, Sandra L.

Electric lamp and discharge devices

Discharge devices having a multipointed or serrated edge...

313336, 313351, H01J 0102, H01J 0116, H01J 1910

Patent

active

057172757

ABSTRACT:
In a multi-emitter electron gun of a field-emission type constructed by the integrated circuit technique, each emitter comprising an emission electrode having an emissive point, an extracting gate electrode, and a focusing electrode, the focusing electrode in a peripheral zone of the multi-emitter electron gun is brought to a lower electric potential as compared with that in a central zone so that the emitter in the peripheral zone has a beam convergence higher than that of the emitter in the central zone. Instead, the focusing electrode in the peripheral zone has a greater thickness as compared with that in the central zone. Alternatively, the focusing electrode in the peripheral zone has a smaller aperture as compared with that in the central zone. Alternatively, the interval between the extracting gate electrode and the focusing electrode is wider in the emitter in the central zone as compared with that in the peripheral zone. Alternatively, the emitter in the peripheral zone alone comprises the focusing electrode of two layers with an upper-layer focusing electrode kept at an electric potential lower than that of a lower-layer focusing electrode. Alternatively, the emitter in the central zone alone further comprises an electrode located between the extracting gate electrode and the focusing electrode and brought to an electric potential substantially equal to that of the extracting gate electrode.

REFERENCES:
patent: 5150019 (1992-09-01), Thomas et al.
patent: 5514847 (1996-05-01), Makishima et al.
patent: 5559390 (1996-09-01), Makishima et al.
patent: 5561345 (1996-10-01), Kuo
patent: 5581146 (1996-12-01), Pribat et al.

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