Starting aid for an electrodeless high intensity discharge lamp

Electric lamp and discharge devices: systems – Pulsating or a.c. supply – Induction-type discharge device load

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315344, H05B 4116

Patent

active

052489183

ABSTRACT:
This electrodeless high intensity discharge lamp including a light-transmissive arc tube having spaced wall portions of dielectric material and a first gaseous fill within the arc tube. An excitation coil about the arc tube is energizable with RF current effective to develop a toroidal arc discharge in the first gaseous fill upon a dielectric breakdown of the fill. A starting container is joined to the arc tube and has an end wall constituted by one of said arc-tube wall portions. A second gaseous fill within the starting container has a dielectric strength lower than that of the first gaseous fill. For initiating the rotoidal arc discharge, we provide an arrangement for producing a dielectric breakdown of the gaseous fill within the starting container that develops into an electric discharge that changes the potential at the end wall in such a manner as to cause a dielectric breakdown of the first gaseous fill.

REFERENCES:
patent: 4810938 (1989-03-01), Johnson et al.
patent: 4812702 (1989-03-01), Anderson
patent: 4894589 (1990-01-01), Borowiec
patent: 4894590 (1990-01-01), Witting
patent: 4902937 (1990-02-01), Witting
patent: 4959584 (1990-09-01), Anderson

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