Color picture tube having an inline electron gun with built-in s

Details Color picture tube having an inline electron gun with built-in s Color picture tube having an inline electron gun with built-in s

1984-02-21

1986-04-15

DeMeo, Palmer C.

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313460, H01J 2956, H01J 2951

Patent

active

045830240

ABSTRACT:
An improved color picture tube has an inline electron gun for generating and directing three electron beams, a center beam and two side beams, along coplanar paths toward a screen of the tube. The gun includes a main focus lens for focusing the electron beams. The main focus lens is formed by two spaced electrode members, each having three separate inline apertures therein, a center aperture and two side apertures. The improvement comprises each of the apertures in each of the focus lens electrodes having a shape that distorts a portion of the focus lens thereat, to at least partially compensate for an astigmatic effect within the tube that acts on an associated electron beam. The side apertures in both of the electrodes are nonsymmetrical about axes that pass through the respective side apertures and are perpendicular to the initial coplanar paths of the electron beams.

REFERENCES:
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patent: 4370592 (1983-01-01), Hughes et al.
patent: 4374342 (1983-02-01), Say
patent: 4388553 (1983-06-01), Chen
patent: 4406970 (1983-09-01), Hughes

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