Apparatus for operating a fluorescent lamp of an image forming a

Details Apparatus for operating a fluorescent lamp of an image forming a Apparatus for operating a fluorescent lamp of an image forming a

1994-10-20

1997-05-06

Pascal, Robert

Electric lamp and discharge devices: systems

With cathode or cathode heater supply circuit

315 98, 315219, 315222, 315291, 315DIG5, H05B 3900

Patent

active

056274343

ABSTRACT:
An apparatus for operating a fluorescent lamp having first and second power source circuits, the second power source circuit including a high frequency transformer having two or more outputs for supplying pre-heating electric currents to filaments, the second power source circuit being arranged to be controllable individually from the first power source circuit for supplying a tube electric current to turn on a fluorescent lamp so that the electric power level for pre-heating the filaments is switched between a state where a light adjustment is performed by turning on/off a tube electric current at high frequency and a state where the fluorescent lamp is turned off in a standby mode.

REFERENCES:
patent: 4378515 (1983-03-01), Nakai et al.
patent: 4920299 (1990-04-01), Presz et al.
patent: 4980811 (1990-12-01), Suzuji et al.
patent: 4988920 (1991-01-01), Hoeksma

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