Rare gas discharge fluorescent lamp device

Details Rare gas discharge fluorescent lamp device Rare gas discharge fluorescent lamp device

1990-05-11

1991-12-10

Laroche, Eugene R.

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Periodic switch in the primary circuit of the supply...

315209R, 315307, 315DIG7, 313576, 313642, H05B 4136

Patent

active

050721550

ABSTRACT:
The invention provides a rare gas discharge fluorescent lamp device which is long in life and high in brightness and efficiency. The lamp device comprises a rare gas discharge fluorescent lamp including a glass bulb having xenon, argon or krypton gas enclosed therein, a fluorescent layer formed on an inner face of the bulb, and a pair of electrodes located at the opposite ends of the bulb. A pulse-like voltage wherein the ratio of an energization period with respect to one cycle is higher than 5% but lower than 70% (xenon or krypton gas) or 80% (argon gas) and the energization period is shorter than 150 .mu.sec is applied between the electrodes of the lamp. Such pulse-like voltage is produced from a circuit including a dc power source, a pulse signal source, and a switching element for controlling application of a voltage of the dc power source or such voltage boosted by a boosting transformer or a resonance circuit. Where the negative electrode includes a filament coil, a rectifying element is connected between the electrodes of the lamp for allowing pre-heating of the filament coil.

REFERENCES:
patent: 3745411 (1973-07-01), Polman et al.
patent: 4899090 (1990-02-01), Yoshiike et al.

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