Microwave energized plasma lamp with solid dielectric waveguide

Details Microwave energized plasma lamp with solid dielectric waveguide Microwave energized plasma lamp with solid dielectric waveguide

2005-07-26

2005-07-26

Lee, Wilson (Department: 2821)

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

Induction-type discharge device load

C315S111410

Reexamination Certificate

active

06922021

ABSTRACT:
A plasma lamp including a waveguide body consisting essentially of at least one dielectric material having a dielectric constant greater than approximately 2. The body is coupled to a microwave power source which causes the body to resonate in at least one resonant mode. At least one lamp chamber integrated with the body contains a bulb with a fill forming a light-emitting plasma when the chamber receives power from the resonating body. A bulb either is self-enclosed or an envelope sealed by a window or lens covering the chamber aperture. Embodiments disclosed include lamps having a drive probe and a feedback probe, and lamps having a drive probe, feedback probe and start probe, which minimize power reflected from the body back to the source when the source operates: (a) at a frequency such that the body resonates in a single mode; or (b) at one frequency such that the body resonates in a relatively higher order mode before a plasma is formed, and at another frequency such that the body resonates in a relatively lower order mode after it reaches steady state.

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