Indicator device with vacuum fluorescence elements

Details Indicator device with vacuum fluorescence elements Indicator device with vacuum fluorescence elements

1979-01-26

1980-12-23

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

With cathode or cathode heater supply circuit

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

315101, 315107, 315224, 315311, 3151691, 328270, H05B 4138

Patent

active

042412781

ABSTRACT:
A indicator device with vacuum fluorescence elements controlled or triggered by a driving circuit, the heaters of the elements lying in a heating circuit. The heating circuit contains a switch which is controlled or triggered by a clock generator and the clock pulse frequency and the pulse duty factor of the control signal pulses are selected such that the effective value of the pulsed heating current is equal or approximately equal to the dc heating current in accordance with the elements.

REFERENCES:
patent: 3567995 (1971-03-01), Lauritzen et al.
patent: 4156166 (1979-05-01), Shapiro et al.
patent: 4158794 (1979-06-01), Sandler
patent: 4167690 (1979-09-01), Gange

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