Fluorescent indicator tube driving circuit

Details Fluorescent indicator tube driving circuit Fluorescent indicator tube driving circuit

1983-02-17

1984-12-11

Chatmon, Saxfield

Electric lamp and discharge devices: systems

With cathode or cathode heater supply circuit

Pulsating or a.c. supply to the cathode or heater circuit

340767, 315107, 3151691, H05B 3900, H05B 4136

Patent

active

044880898

ABSTRACT:
A plurality of heater elements are heated using a DC voltage to render the display brightness of a fluorescent indicator tube uniform. A circuit comprises a first circuit for intermittently applying a heater current to the indicator tube at a predetermined interval, and a second circuit for preventing the indicator tube from developing a display during heating the heater elements.

REFERENCES:
patent: 4158794 (1979-06-01), Sandler

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