Apparatus and method for rejuvenating cathode ray tubes

Details Apparatus and method for rejuvenating cathode ray tubes Apparatus and method for rejuvenating cathode ray tubes

1975-04-30

1976-12-14

Lazarus, Richard B.

316 28, H01J 950

Patent

active

039972232

ABSTRACT:
The cathode material of a black and white or color cathode ray tube is rejuvenated by apparatus and a method which initially supplies heater voltage to the heater filament prior to the application of a source of positive voltage between the control grid and the cathode, to pre-heat the cathode to a rejuvenation temperature effective upon flow of appreciable cathode current to rejuvenate the cathode material. Then, upon operation of a depressible push-button a source of positive voltage is connected between the control grid and the cathode to effect said flow of appreciable cathode current and the simultaneous removal of the heater filament voltage from the heater filament, so that the time interval of large cathode current flow depends solely upon the thermal characteristics of the cathode structure.

REFERENCES:
patent: 2774645 (1956-12-01), Batchelor, Jr.
patent: 2783116 (1957-02-01), Schaedler et al.

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