Picture display device comprising a picture display tube and a c

Details Picture display device comprising a picture display tube and a c Picture display device comprising a picture display tube and a c

1981-09-21

1984-11-06

Heyman, John S.

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

Plural load device systems

315 94, 315106, H01F 1300

Patent

active

044814763

ABSTRACT:
A picture display device including a picture display tube and a circuit for supplying the heater thereof with an increased heater voltage during a predetermined warming up period. The heater is connected to the secondary winding of an (auto) transformer, the primary winding of which is connected to a terminal of an a.c. voltage source, for example a winding provided on a line output transformer, the other ends of the primary and the secondary windings being interconnected and connected to a positive temperature coefficient thermistor and the other ends of the heater and the thermistor being connected to the other terminal of the source. The secondary winding has more turns than the primary winding.

REFERENCES:
patent: 3798369 (1974-03-01), Dietch
patent: 3886401 (1975-05-01), Berg
patent: 3982153 (1976-09-01), Burdick et al.

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