Focusing means in a unitized bi-potential CRT electron gun assem

Electric lamp and discharge devices – Cathode ray tube – Plural beam generating or control

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H01J 2950, H01J 2956

Patent

active

043743420

ABSTRACT:
A structural beam focusing improvement is introduced into the main focusing electrode of at least one of the gun structures in a CRT plural beam bi-potential in-line electron gun assembly. This improvement, being in the form of a pair of sideboard elements, one of which is positioned on either side of a forward aperture in the unitized main focusing electrode, imparts correctional influences to asymmetries in the respective lensing field, thereby resulting in the achievement of a desired circular beam spot landing at the center of the screen.

REFERENCES:
patent: 4086513 (1978-04-01), Evans, Jr.
patent: 4208610 (1980-06-01), Schwartz
patent: 4275332 (1981-06-01), Ashizaki et al.

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