Electron gun having a cathode with limited electron discharge re

Details Electron gun having a cathode with limited electron discharge re Electron gun having a cathode with limited electron discharge re

1997-11-21

1999-11-23

Patel, Ashok

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313447, 313449, 313452, 313453, H01J 2904, H01J 2948, H01J 128

Patent

active

059906081

ABSTRACT:
An electron gun provides an improved focusing characteristic of electron beams surely and effectively, and permits position alignment to be relatively easy in assembling thereof. In an electron gun which includes a cathode for discharging electrons and a plurality of grids each having electron passing-through holes for guiding the electrons discharged from the cathode unidirectionally, an electron dischargeable region is formed in an electron discharging plane of the cathode, which is band-shaped. In addition, the length of the band-shaped area constituting the electron dischargeable region on its shorter side is less than 80% of the diameter of the area from where electrons are discharged when a practical maximum current is taken out without limiting the electron dischargeable region.

REFERENCES:
patent: 2718607 (1955-09-01), Katz
patent: 2895070 (1959-07-01), Espersen
patent: 3534455 (1970-10-01), Bondley
patent: 3980919 (1976-09-01), Bates et al.

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