Method of forming hot cathodes

Details Method of forming hot cathodes Method of forming hot cathodes

1982-12-20

1985-04-16

Ramsey, Kenneth J.

Electric lamp or space discharge component or device manufacturi

Process

With start up, flashing or aging

H01J 904

Patent

active

045113408

ABSTRACT:
A method is disclosed which permits instant-heat cathodes for color-picture tubes to be formed in a single process step and avoids the formation of an activated barium-oxide deposit on the grid cylinder. This is achieved by alternately switching the heater current on and off with the operating voltages applied, the heater voltage and the "on" and "off" periods of the heater current being chosen so that, averaged over the "on" and "off" periods, the rated heating power and the rated power dissipation are maintained during the formation process, and that, when the temperature of the emitting material decreases during the "off" periods, no saturation of the electrode currents occurs.

REFERENCES:
patent: 3357766 (1967-12-01), Conger, Jr.
patent: 3441333 (1969-04-01), Javorik
patent: 4125306 (1978-11-01), Coble
patent: 4326762 (1982-04-01), Hocken

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