Electrode structure for an electron gun for a cathode ray tube

Details Electrode structure for an electron gun for a cathode ray tube Electrode structure for an electron gun for a cathode ray tube

1991-12-18

1994-04-05

Yusko, Donald J.

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313412, 313413, H01J 2950, H01J 2951

Patent

active

053008545

ABSTRACT:
An electron gun for a cathode ray tube includes common large-aperture electron beam passing holes which are formed by recessing the portion except the rims on the outgoing side plane of a focus electrode and the incoming side plane of a final accelerating electrode, for expanding an electric field. Three independent small-aperture electron beam passing holes are formed at the recessed position by a predetermined depth from the rims. The ratio of the horizontal diameter to the vertical diameter of the central electron beam passing hole among the three independent small-aperture electron beam passing holes of the focus electrode is smaller than those of the outer independent small-aperture electron beam passing holes. Accordingly, the influence of the spherical aberration to the electron beam which passes through the main lens is reduced, so that the quality of the picture reproduced on the screen is improved.

REFERENCES:
patent: 4370592 (1983-01-01), Hughes et al.

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