Color cathode ray tube apparatus

Details Color cathode ray tube apparatus Color cathode ray tube apparatus

1995-08-01

1996-05-21

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315 15, H01J 2958

Patent

active

055192904

ABSTRACT:
A seventh grid applied with an anode high voltage, a sixth grid applied with a dynamic voltage, and a fifth grid are provided in a main electron lens section of an electron gun. The dynamic voltage is obtained by superimposing a DC voltage lower than the anode high voltage by a voltage which changes in synchronization with deflection of electron beams. The fifth grid is connected to the sixth grid through a resistor device provided in the tube so as to be adjacent to the sixth grid in the side of the electron beam generator section. The fifth grid and the sixth grid form a multi-pole lens for correcting deflection aberration within the focus lens region of the main electron lens section. As a result, the withstanding voltage of the electron gun using a dynamic focusing method, the resolution of the color cathode ray tube apparatus, and the reliability are improved.

REFERENCES:
patent: 4814670 (1989-03-01), Suzuki et al.
patent: 4945284 (1990-07-01), Shimoma et al.
patent: 5449983 (1995-09-01), Sugawara et al.

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