Cathode ray tube

Details Cathode ray tube Cathode ray tube

1975-08-01

1978-10-10

Segal, Robert

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

315 13C, H01J 2951

Patent

active

041198832

ABSTRACT:
In a cathode ray tube of the single-gun, plural-beam type in which the plurality of beams are made to intersect each other substantially at the optical center of a main focusing lens, any disparity in the focusing effects imparted to the respective beams by the main focusing lens and any auxiliary lens is corrected by applying suitably different biasing voltages to the cathodes emitting the respective beams so that the beams are subjected to different accelerations and travel through the lens fields at different speeds. Thus, the focusing effects of the lens fields on the respective beams are varied to cause the beams to be precisely focused on the screen. The cathode and control grid electrodes are physically arranged to permit control of the individual beam currents for proper color balance.

REFERENCES:
patent: 3243625 (1965-03-01), Levine et al.
patent: 3432718 (1969-03-01), Preisig
patent: 3448316 (1969-06-01), Yoshida et al.
patent: 3603839 (1971-09-01), Takayanagi
patent: 3755703 (1973-08-01), Ueno et al.
patent: 3883771 (1975-05-01), Ohgoshi et al.

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