Color-picture tube having a supplementary electrode for obtainin

Details Color-picture tube having a supplementary electrode for obtainin Color-picture tube having a supplementary electrode for obtainin

1995-07-11

1997-10-07

O'Shea, Sandra L.

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313414, 313449, 315 15, 315382, H01J 2951

Patent

active

056752113

ABSTRACT:
A color-picture tube having a convergence electrode, to which a focusing voltage is applied, a final accelerating electrode, to which an anode voltage is applied, and at least one supplementary electrode placed between the convergence electrode and the final accelerating electrode, to which either (1) a voltage higher than the focusing voltage and lower than the anode voltage is applied or (2) no voltage is applied, resulting in the supplementary electrode being free from a directly applied electric potential, wherein its electric potential is induced by the convergence electrode and the final accelerating electrode. Each of the convergence electrode and the final accelerating electrode is a tube having an elliptical cross section closed with an elliptical end plate having three holes arranged in-line for electron passage. In at least one of the tubes, the end plate is positioned away from the opening of the tube closer to the supplementary electrode. The supplementary electrode is a tube of elliptical cross section arranged coaxially with the convergence electrode and final accelerating electrode. A high resolution picture is obtained without enlarging the bulb neck of the picture tube.

REFERENCES:
patent: 4712043 (1987-12-01), Takenaka et al.
patent: 4922166 (1990-05-01), Ichida et al.
patent: 4990822 (1991-02-01), Guzowski et al.
patent: 5194778 (1993-03-01), Koh
patent: 5394054 (1995-02-01), Chen et al.
patent: 5489814 (1996-02-01), Banury

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