Field emission electron gun capable of minimizing nonuniform inf

Details Field emission electron gun capable of minimizing nonuniform inf Field emission electron gun capable of minimizing nonuniform inf

1997-04-16

1998-07-28

Patel, Ashok

Electric lamp and discharge devices

Discharge devices having three or more electrodes

Discharge control electrode

313307, 313309, 313336, 313351, 315325, 315349, 315341, H01J 902

Patent

active

057866570

ABSTRACT:
In a field emission electron gun including emitters (104) on predetermined parts of a substrate (409), an insulator film (105) on a remaining part of the substrate, a first gate electrode (101) on the insulator film so as to surround the emitters with a space left between each emitter and the first gate electrode, the emitters are formed on the substrate except a center part of the substrate. The first gate electrode has an inner peripheral surface which defines a hole (107) exposing a center portion of the insulator film that is positioned on the center part of the substrate. A second gate electrode (102) is formed on the insulator film to surround an outer peripheral surface of the first gate electrode with a distance left between the outer peripheral surface of the first gate electrode and the second gate electrode. A third gate electrode (106) may be formed on the center portion of the insulator film with another distance left between the inner peripheral surface of the first gate electrode and the third gate electrode.

REFERENCES:
patent: 4578614 (1986-03-01), Gray et al.
patent: 5666024 (1997-09-01), Vickers

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