Flashing florescent lamps

Details Flashing florescent lamps Flashing florescent lamps

1980-12-22

1983-05-10

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Discharge device and/or rectifier in the supply circuit

Flashers

315101, 315209R, H05B 4130

Patent

active

043832024

ABSTRACT:
Fluorescent lamps are flashed by modulating the lamp operating current during a given half-cycle. The other half-cycle operation is unmodulated, thereby resulting in flashing from full lamp brilliance to substantially one-half lamp brilliance. In one embodiment, the modulating circuitry is placed in the line cord providing power to the lamp. The circuitry includes a gated diode and a resistor placed in parallel with each other. A full wave line cord embodiment employs a diode bridge. In another embodiment, the modulating circuitry is placed across the terminals of a conventional fluorescent lamp starter so that current is bypassed around the starter. With this embodiment of the invention, the discharge on half of the cycle is extinguished, but current flows through the lamp electrodes, thereby keeping them hot enough to emit electrons and prevent life-damaging high cathode fall.

REFERENCES:
patent: 2858478 (1958-10-01), Kershaw
patent: 3611024 (1971-10-01), Nakatsu
patent: 3710185 (1973-01-01), Switsen
patent: 3719857 (1973-03-01), Sharp
patent: 3731142 (1973-05-01), Spira et al.
patent: 3753040 (1973-08-01), Quenelle

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