Electric lamp and discharge devices – Cathode ray tube – Plural beam generating or control
Patent
1987-10-22
1989-04-25
Wieder, Kenneth
Electric lamp and discharge devices
Cathode ray tube
Plural beam generating or control
313449, 315 15, H01J 2946, H01J 2956
Patent
active
048251208
ABSTRACT:
In an electron gun apparatus for color cathode-ray tube, first and second focusing electrodes respectively for focusing electron beams emitted from three electron guns are disposed. Between the first and second focusing electrodes, a pair of third focusing electrodes for forming an axial-nonsymmetrical electron lens are also disposed. Mutually different dynamic voltages are supplied to the third focusing electrodes in accordance with the change in deflection angle of the electron beam. Owing to the above described structure, uniform resolution is obtained at both the central part and the peripheral part of the screen.
REFERENCES:
patent: 4712043 (1987-12-01), Takenaka et al.
Hitachi , Ltd.
Hitachi Device Eng. Co. Ltd.
Wieder Kenneth
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