Method of forming hot cathodes

Details Method of forming hot cathodes Method of forming hot cathodes

H - Electricity

01

J

316/17

H01J 9/04 (2006.01)

Patent

CA 1212714

Abstract of the Disclosure: Method of Forming Hot Cathodes 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 tempera- ture of the emitting material decreases during the "off" periods, no saturation of the electrode currents occurs.

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