Method for aging a cathode of a cathode-ray tube

Details Method for aging a cathode of a cathode-ray tube Method for aging a cathode of a cathode-ray tube

1981-05-21

1983-07-12

Ramsey, Kenneth J.

Electric lamp or space discharge component or device manufacturi

Process

With start up, flashing or aging

445 62, H01J 944

Patent

active

043928340

ABSTRACT:
A method of aging a cathode of an evacuated cathode-ray tube having an electron gun including a heater, a cathode, a control electrode, a screen electrode and a focus electrode is proposed. The cathode and the focus electrode are interconnected. A first potential is applied to the heater while a second potential is applied to the cathode and focus electrode. At the same time, a third potential, more positive than the second potential, is applied to the control electrode. A fourth potential is applied to the screen electrode. A change in the fourth potential is sensed and the sensed change in the fourth potential is used to generate a control signal to vary the first potential to the heater. The aging process is terminated when the control signal causes a predetermined value of the first potential to be achieved. A structure to provide at least some of the above-indicated potentials as well as to sense the change in one of the potentials and to generate the control signal is also disclosed.

REFERENCES:
patent: 1881645 (1932-10-01), Jones et al.
patent: 1983668 (1934-12-01), Jones et al.
patent: 2561768 (1951-07-01), Adler
patent: 2917357 (1959-12-01), Nash et al.
patent: 3357766 (1967-12-01), Conger
patent: 3698786 (1972-10-01), Gronka
patent: 3966287 (1976-06-01), Liller
patent: 4125306 (1978-11-01), Coble

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