Field-emission type cold cathode with enhanced electron beam axi

Details Field-emission type cold cathode with enhanced electron beam axi Field-emission type cold cathode with enhanced electron beam axi

1996-12-20

1999-03-30

Patidar, Jay M.

Electric lamp and discharge devices

Discharge devices having a multipointed or serrated edge...

313308, 313336, 313351, 313497, 313331, H01J 102, H01J 130

Patent

active

058893598

ABSTRACT:
There is provided a field-emission type cold cathode including (a) a substrate at least a surface of which has electrical conductivity, (b) an insulating layer formed on the substrate, (c) an electrically conductive gate electrode formed on the insulating layer, (d) an almost conical, sharp-pointed emitter electrode disposed in a hole formed through the gate electrode and insulating layer, (e) a focusing electrode formed on the insulating layer so that the focusing electrode is located in the same plane as the gate electrode and surrounds the gate electrode, and (f) a feeder line formed in the same plane as the gate electrode. The feeder line extends from the gate electrode into the focusing electrode and being shaped complementarily with the focusing electrode so that the focusing electrode is present at every radial directions as viewed from a center of the emitter electrode. The present invention provides an electron source which has small divergence and has high axis-symmetry, and which can be fabricated by conventional field-emission type cold cathode fabrication methods having no focusing electrodes. Hence, the present invention makes it possible to provide a high-quality cathode at lower cost suitable for an electron source for an electronic tube and an electron beam emitter.

REFERENCES:
patent: 5734223 (1998-03-01), Makishima et al.
Spindt; "A Thin Film Field-Emission Cathode"; Jun. 1968; pp. 3504-3505; J. Applied Physics, Vol. 39, No. 7.
Dawson et al; "Beam Focusing for Field-Emission Flat-Panel Displays ";Feb. 1995; pp.340-347; IEEE Transactions on Electron Devices vol.42; No. 2.
Py et al; "Microtip electron Beam Refocusing by Surrounding Ring"; 1995; p. 640, 30p-T-3; 42nd Applied Physics Related Association Conference.

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