Electron gun for color-picture tube device

Details Electron gun for color-picture tube device Electron gun for color-picture tube device

1989-03-08

1990-07-31

Yusko, Donald J.

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313449, 315 3, 315 15, 315382, H01J 2958

Patent

active

049452843

ABSTRACT:
An electron gun for color-picture tube device comprises a final accelerating electrode and a focusing electrode divided into plural electrode units in the axial direction of the tube. A first focusing electrode unit adjacent to the final accelerating electrode is connected to a second focusing electrode unit adjacent to the first focusing electrode unit through a resistor. A focusing voltage being change in synchronous with the deflection of an electron beam is applied to the first focusing electrode unit. The resistor is used for removing the a.c. components from the focusing voltage. Then, the removed focusing voltage is applied to the second focusing electrode. For the electron beam deflected on the peripheral part of the screen, a quadrupole lens is formed. On the first focusing electrode unit side opposite to the second focusing electrode unit are formed first electron beam path holes whose major axes extend horizontally. On the second focusing electrode unit side opposite to the first focusing electrode unit are formed second electron beam path holes whose major axes extend vertically. As a result, the quadrupole lens serves to suppress a halo portion.

REFERENCES:
patent: 4514661 (1985-04-01), Stone
patent: 4531075 (1985-07-01), Stone
patent: 4728859 (1988-03-01), Natsuhara et al.
patent: 4763047 (1988-08-01), Watanabe et al.
patent: 4814670 (1989-03-01), Suzkui et al.

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