CRT Focusing electrode structure

Details CRT Focusing electrode structure CRT Focusing electrode structure

1981-09-21

1983-10-25

Smith, Alfred E.

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313409, H01J 2950

Patent

active

044121490

ABSTRACT:
An improved beam focusing structure, in the form of overlapping lenses, is incorporated into the forward portion of the unitized main focusing electrode of a compactly-dimensioned CRT three-beam in-line electron gun assembly. Such is accomplished by forming a common, elongated and configurated focusing electrode aperture to accommodate passage of the three beams therethrough. A pair of planar wall elements, spatially positioned in the aperture, to define the three lenses, have concave arcuately shaped forward edges formed in acccordance with the spacing between the focusing electrode and an adjacent plural apertured accelerating electrode.

REFERENCES:
patent: 4208610 (1980-06-01), Schwartz
patent: 4275332 (1981-06-01), Ashizaki et al.
patent: 4317065 (1982-02-01), Hughes

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