Cathode and method of operating the same

Details Cathode and method of operating the same Cathode and method of operating the same

1977-05-02

1979-09-11

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315105, 313422, H01J 2970, H01J 2972

Patent

active

041676904

ABSTRACT:
A series of discrete heating current pulses are passed through a line cathode so as to cause the cathode to emit electrons therefrom. Between each consecutive pair of pulses is a cooling period during which no heating current flows through the cathode. Current is extracted from the cathode during this cooling period. In a preferred embodiment for an image display device, the heating pulse duration is about 10 .mu.sec and the cooling period is about 50.mu.sec. In this scheme, the heating period corresponds roughly to the horizontal retrace time between line times of 50.mu.sec.

REFERENCES:
patent: 2916668 (1959-12-01), Dyke et al.
patent: 2965801 (1960-12-01), Archer et al.
patent: 3229169 (1966-01-01), Deming

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