Field emission cathode type electron gun with individually-contr

Details Field emission cathode type electron gun with individually-contr Field emission cathode type electron gun with individually-contr

1997-09-25

1999-11-02

Shingleton, Michael B

Electric lamp and discharge devices: systems

Plural power supplies

Plural cathode and/or anode load device

315307, H05B 3702

Patent

active

059777192

ABSTRACT:
In a field emission cathode type electron gun, a plurality of cathode segments and a plurality of gate control circuits are provided. Each of the gate control circuits is connected to one of the cathode segments. Each of the cathode segments includes a cathode electrode, a gate electrode, an insulating layer therebetween, and a plurality of cone-shaped emitters formed within openings perforated in the gate electrode and the insulating layer. Each of the gate control circuits detects a current flowing through one of the cathode segments and controls a voltage of the gate electrode of the respective cathode segments in accordance with the detected current, so that the detected current is brought close to a definite value.

REFERENCES:
patent: 5103145 (1992-04-01), Doran
patent: 5359256 (1994-10-01), Gray
patent: 5552677 (1996-09-01), Pagones
patent: 5578906 (1996-11-01), Smith
patent: 5700175 (1997-12-01), Wang et al.
Abstract of JP-A8087957.
Abstract of JP-A6243777.
Abstract of JP-A534000.
C. A. Spindt, "A Thin-Film Field Emission Cathode" Journal of Applied Physics, vol. 39, No. 7, pp. 3504-3505, Jun. 1968.
English abstract of JP 5343000.
English abstract of JP 7235258.
English abstract of JP 887957.
Patent Abstracts of Japan, vol. 096, No. 008, Aug. 30, 1996, & JP 08 087957 (Alps Electric Co., Ltd.) Apr. 2, 1996.
Patent Abstracts of Japan, vol. 018, No. 167 (E-1528), Mar. 22, 1994 & JP 05 343000 (Futaba Corp) Dec. 24, 1993.

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