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High brightness microwave lamp

United States Patent

September 9, 2003
View the Complete Patent at the US Patent & Trademark Office
An electrodeless microwave discharge lamp includes a source of microwave energy, a microwave cavity, a structure configured to transmit the microwave energy from the source to the microwave cavity, a bulb disposed within the microwave cavity, the bulb including a discharge forming fill which emits light when excited by the microwave energy, and a reflector disposed within the microwave cavity, wherein the reflector defines a reflective cavity which encompasses the bulb within its volume and has an inside surface area which is sufficiently less than an inside surface area of the microwave cavity. A portion of the reflector may define a light emitting aperture which extends from a position closely spaced to the bulb to a light transmissive end of the microwave cavity. Preferably, at least a portion of the reflector is spaced from a wall of the microwave cavity. The lamp may be substantially sealed from environmental contamination. The cavity may include a dielectric material is a sufficient amount to require a reduction in the size of the cavity to support the desired resonant mode.
Kirkpatrick; Douglas A. (Great Falls, VA), Dolan; James T. (Frederick, MD), MacLennan; Donald A. (Gaithersburg, MD), Turner; Brian P. (Damascus, MD), Simpson; James E. (Gaithersburg, MD)
Fusion Lighting, Inc. (Rockville, MD)
09/ 776,914
February 6, 2001
The invention described herein was made with Government support under Contract No. DE-FC01-97EE23776 awarded by the Department of Energy. The Government has certain rights in this invention.