Lighting device for fluorescent lamp

Details Lighting device for fluorescent lamp Lighting device for fluorescent lamp

1991-03-04

1992-07-14

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, 315209R, 315DIG7, H05B 4136

Patent

active

051306050

ABSTRACT:
A lighting device for a hot cathode fluorescent lamp used for a back light of a liquid crystal display or the like attempts to prolong the life of a lamp in a lighting device for a low consumption wattage fluorescent lamp. More specifically, the hot cathode fluorescent lamp is started while being pre-heated, and even after starting, a pre-heat current keeps flowing. The pre-heat current value after starting is set to be smaller than that at the time of starting for the purpose of optimizing the hot spot temperature. With employment of the configuration as described above, the lifetime of the hot cathode fluorescent lamp when used as a back light can extend to 10,000 hours or more.

REFERENCES:
patent: 4682080 (1987-07-01), Ogawa et al.

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