Focusing electrode in electron gun for color cathode ray tube

Details Focusing electrode in electron gun for color cathode ray tube Focusing electrode in electron gun for color cathode ray tube

1998-04-01

2000-07-25

Patel, Ashok

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313428, 313432, 313439, H01J 2951

Patent

active

060940042

ABSTRACT:
Focusing electrode in an electron gun for a color cathode ray tube, is disclosed, which can reduce a man-power and a number of components in a fabrication of the electron gun and can prevent a center electron beam from being elongated horizontally depending on a fitted depth of an inner guide electrode, the focusing electrode including a first focusing electrode adapted to be applied of a low static voltage and having a face with three vertically elongated electron beam pass-through holes of a key hole type and an inner guide electrode with three electron beam passthrough holes disposed at an inner side of the face, and a second focusing electrode adapted to be applied of a high dynamic voltage and having correcting electrodes unitary with a face of the second focusing electrode opposite to the first focusing electrode formed in a cathode direction at upper and lower sides of each of the three electron beam pass-through holes, whereby facilitating changes of center and side powers of the dynamic quadrupole lenses formed between the electron beam pass-through holes/the inner guide electrode in the first focusing electrode and the correcting electrodes on application of the dynamic voltage to the second focusing electrode by changing lengths between the center correcting electrode and the side correcting electrodes according to a fitted depth of the inner guide electrode in the second focusing electrode.

REFERENCES:
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patent: 4599534 (1986-07-01), Shirai et al.
patent: 4772827 (1988-09-01), Osakabe
patent: 4990822 (1991-02-01), Guzowski et al.
patent: 5027043 (1991-06-01), Chen et al.
patent: 5126625 (1992-06-01), Cho
patent: 5170101 (1992-12-01), Gorski et al.
patent: 5532547 (1996-07-01), Park et al.

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