Rare gas discharge fluorescent lamp device.

摘要

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 (10) including a glass bulb (1) having xenon, argon or krypton gas enclosed therein, a fluorescent layer formed on an inner face of the bulb, and a pair of electrodes (3a,3b) located at the opposite ends of the bulb (1). 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 (13), a pulse signal source (15), and a switching element (14) for controlling application of a voltage of the dc power source (13) or such voltage boosted by a boosting transformer (12) or a resonance circuit. Where the negative electrode includes a filament coil, a rectifying element (17) is connected between the electrodes of the lamp for allowing pre-heating of the filament coil.