Illumination unit, electrodeless low-pressure discharge lamp, an

Details Illumination unit, electrodeless low-pressure discharge lamp, an Illumination unit, electrodeless low-pressure discharge lamp, an

1994-05-05

2000-05-02

Kinkead, Arnold

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

Induction-type discharge device load

315 57, 315 62, 315344, 315348, 252 6256, 313484, H01F 27255, H05B 4124

Patent

active

060576499

ABSTRACT:
An illumination unit including an electrodeless low-pressure discharge lamp (20) and a supply device (50). The lamp has a discharge vessel (30) which encloses in a gastight manner a discharge space (31) which is provided with an ionizable filling. The lamp (20) further has a coil (40) provided with a winding (42) around a sintered core (41) of polycrystalline ferrite material, which winding (42) is connected to the supply device (50). The coil (40) is capable of inducing a high-frequency magnetic field which maintains a discharge in the discharge space (31). The losses in the core (41), when measured at room temperature in a magnetic field with a frequency of 3 MHz and a magnetic flux density of 10 mT, amount to at most 150 mW/cm.sup.3. This has the advantage that the lamp (20) ignites comparatively quickly and loads the supply device (50) comparatively weakly during ignition. The supply device (50) as a result can have a comparatively long useful life.

REFERENCES:
patent: 3521120 (1970-07-01), Anderson
patent: 4372865 (1983-02-01), Yu et al.
patent: 4710678 (1987-12-01), Houkes et al.
patent: 4748383 (1988-05-01), Houkes
patent: 5138546 (1992-08-01), Johnson et al.

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