Electron gun assembly for color cathode ray tube apparatus

Details Electron gun assembly for color cathode ray tube apparatus Electron gun assembly for color cathode ray tube apparatus

1989-03-15

1990-06-19

Wieder, Kenneth

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313414, 313449, 313460, 315 3, 315 16, 315368, 315382, H01J 2954, H01J 2956, H01J 2996

Patent

active

049356631

ABSTRACT:
In an electron gun assembly, three electron beams emitted from cathodes are passed through an electrode arrangement in which two intermediate electrodes are arranged between focusing are accelerating electrodes. A focusing voltage which is varied depending on an deflection of the electron beam is applied to the focusing electrode and an accelerating voltage is applied to the accelerating electrode. A resistor is connected between the accelerating electrode and the earth through a variable resistor and intermediate points of the resistor are connected to the intermediate electrodes. Thus, convergent and divergent lenses are formed between the focusing electrode and the intermediate electrode and between the accelerating electrode and the intermediate electrode. The lens powers of the convergent and divergent lenses are varied in accordance with the adjustment of the variable resistor.

REFERENCES:
patent: 3679930 (1972-07-01), Colvin et al.
patent: 3995194 (1976-11-01), Blacker, Jr. et al.
patent: 4041428 (1977-08-01), Kikuchi et al.
patent: 4122422 (1978-10-01), Hasegawa et al.
patent: 4672269 (1987-06-01), Kamohara
patent: 4701677 (1987-10-01), Ashizaki et al.
patent: 4712043 (1987-12-01), Takenaka et al.

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