Metal working – Barrier layer or semiconductor device making – Barrier layer device making
Patent
1976-09-30
1977-10-11
Lazarus, Richard B.
Metal working
Barrier layer or semiconductor device making
Barrier layer device making
316 26, H01J 902
Patent
active
040527760
ABSTRACT:
This disclosure depicts a method of spot-knocking an electron gun having a heater and cathode, a control grid G1, a screen grid G2, and four main focus lens electrodes (G3, G4, G5, and G6), wherein a first relatively large gap exists between G2 and G3, between G3 and G4, between G4 and G5, and between G5 and G6, and a second relatively small gap exists between G1 and G2, and a third relatively very small gap exists between G1 and the cathode. The method of this invention involves: establishing the heater and cathode and, the G1 and G2 grids and the G3, G4 and G5 electrodes at substantially ground potential; applying a first fluctuating DC voltage to electrode G6 of a magnitude and for a time effective to cause arcs to occur between portions of the electrodes G5 and G6 so as to remove any particles of metal or contaminants on the electrodes; whereby the grounding of the heater and cathode, the G1 and G2 grids and the G3, G4 and G5 electrodes protects the heater and cathode, and the G1 and G2 grids from arcs caused by the first fluctuating DC voltage; establishing the heater and cathode, the G1 and G2 grids and the G4 electrode at substantially ground potential; applying a second fluctuating DC voltage with an amplitude less than the first fluctuating DC voltage, to electrodes G3, G5 and G6, of a magnitude and for a time effective to cause arcs to occur between portions of the electrodes G4 and G5, between portions of the electrodes G4 and G3, and between portions of the electrodes G2 and G3 so as to remove any sharp particles of metal or contaminants on portions of the G2, G3, G4 and G5 electrodes; whereby the grounding of the heater and cathode and the grounding of the G1 and G2 grids protects the heater and cathode from arcs caused by the second fluctuating DC voltage.
REFERENCES:
patent: 3323854 (1967-06-01), Palac
patent: 3357766 (1967-12-01), Conger, Jr.
patent: 3434770 (1969-03-01), Angelucci et al.
patent: 3698786 (1972-10-01), Gronka
Marino Armando V.
Maskell Roy
Garrett John R.
Lazarus Richard B.
Zenith Radio Corporation
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