Main lens structure for a color cathode ray tube

Details Main lens structure for a color cathode ray tube Main lens structure for a color cathode ray tube

1995-02-28

1997-04-29

Horabik, Michael

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313449, 313460, H01J 2950

Patent

active

056252528

ABSTRACT:
A color cathode ray tube equipped with an electron gun having a main lens with a large equivalent aperture by suppressing spherical aberration and astigmatism of the main lens sufficiently. The main lens for converging the three electron beams, which are arranged generally in parallel in one direction toward the fluorescent face, upon the fluorescent face, includes two electrodes arranged to confront each other with such flattened apertures that the diameter H taken in the one direction is larger than a diameter V taken perpendicularly to the one direction. The orbits of the two side ones of the three electron beams passing through the main lens have a constant gap S from the orbit of the center electron beam. The relations of H=2(S+R) and R>S hold, if the distance between the orbits of the two side electron beams and the inner circumference, as taken in the one direction, of the electrodes constituting the main lens is designated at R.

REFERENCES:
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patent: 5414323 (1995-05-01), Uchida et al.
patent: 5461278 (1995-10-01), Misono et al.

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