Hollow beam electron source

Details Hollow beam electron source Hollow beam electron source

1980-07-28

1982-09-21

Segal, Robert

Electric lamp and discharge devices

Cathode ray tube

Ray generating or control

313456, H01J 2946, H01J 2956

Patent

active

043509266

ABSTRACT:
A cold field emitter is placed in special relationship to an anode device ving a hole in it close to the emitter. A second electrode can be located above the hole in the anode and be a circular shape of lesser diameter than the first anode so as to shape the hollow beam being emitted by the device.

REFERENCES:
patent: 2276806 (1942-03-01), Tonks
patent: 2791711 (1957-05-01), Harris
patent: 2869021 (1959-01-01), Currie
patent: 2887609 (1959-05-01), Dodds
patent: 2916666 (1959-12-01), Hall
patent: 2936396 (1960-05-01), Currie
patent: 2967260 (1961-01-01), Eitel
patent: 3745402 (1973-07-01), Shelton et al.

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