Electron gun

Details Electron gun Electron gun

1977-06-13

1979-03-27

Segal, Robert

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Plural concentrating, accelerating, and/or de-accelerating...

313449, 315382, H01J 2956, H01J 2946

Patent

active

041468180

ABSTRACT:
An electron gun comprising in succession in a vacuum envelope an electron source electrode or cathode, a control grid electrode, a first accelerating electrode or anode and a first and second focussing electrode. It further comprises connections for subjecting in operation each electrode to a polarizing voltage. The first focussing electrode is raised in operation to a polarizing voltage several tens of times higher than the polarizing voltage of the anode which precedes it and the second focussing electrode is raised in operation to a polarizing voltage several times higher than the polarizing voltage of the first focussing electrode which precedes it. The first focussing electrode and the anode form thus a prefocussing lens while the second focussing electrode and the first focussing electrode form a main lens.

REFERENCES:
patent: 2852716 (1958-09-01), Lafferty
patent: 2935636 (1960-05-01), Knechtli
patent: 3852608 (1974-12-01), Johanns et al.
patent: 3962599 (1976-06-01), Say

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