Charged particle beam scanning device

Details Charged particle beam scanning device Charged particle beam scanning device

1974-11-21

1976-09-07

Tubbesing, T.H.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

With secondary emission stage in the cathode-ray tube

313409, H01J 2941

Patent

active

039796361

ABSTRACT:
A plurality of control plates is sandwiched between a cathode and a target to control the flow of charged particles such as electrons and ions between the cathode and the target. The cathode includes an elongated filament for generating charged particles such as electrons. A first electrode is positioned behind the filament with a second electrode having a positive potential interdigitated with the first electrode. The first electrode is divided into segments with a negative potential applied to those segments of first electrode where emission is desired from the elongated filament, and in those areas were emission is not desired those segments of the first electrode are switched sufficiently negative to cut off emission from the elongated filament. Each control plate has a plurality of apertures formed therein which are effectively aligned with corresponding apertures on the other control plates. The aligned apertures form beam channels. The control plates have paired conductive electrodes thereon arranged at predetermined coded finger patterns. Voltages are selectively applied to the control plate electrodes by switching circuitry to focus the charged particles through the apertures associated with selective electrodes while simultaneously aborting the passage of charged particles through the apertures associated with the remaining electrodes. In this manner by selective switching control of the control plate a beam, or a plurality of beams, can be directed to a selected portion or portions of the target at the time.

REFERENCES:
patent: 3740603 (1973-06-01), Kuhn
patent: 3742276 (1973-06-01), Gumpertz
patent: 3769540 (1973-10-01), Thomson
patent: 3803443 (1974-04-01), Hant

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