Skip to Content
Find More Like This
Return to Search

Discharge lamp with reflective jacket

United States Patent

September 18, 2001
View the Complete Patent at the US Patent & Trademark Office
A discharge lamp includes an envelope, a fill which emits light when excited disposed in the envelope, a source of excitation power coupled to the fill to excite the fill and cause the fill to emit light, and a reflector disposed around the envelope and defining an opening, the reflector being configured to reflect some of the light emitted by the fill back into the fill while allowing some light to exit through the opening. The reflector may be made from a material having a similar thermal index of expansion as compared to the envelope and which is closely spaced to the envelope. The envelope material may be quartz and the reflector material may be either silica or alumina. The reflector may be formed as a jacket having a rigid structure which does not adhere to the envelope. The lamp may further include an optical clement spaced from the envelope and configured to reflect an unwanted component of light which exited the envelope back into the envelope through the opening in the reflector. Light which can be beneficially recaptured includes selected wavelength regions, a selected polarization, and selected angular components.
MacLennan; Donald A. (Gaithersburg, MD), Turner; Brian P. (Damascus, MD), Kipling; Kent (Gaithersburg, MD)
Fusion Lighting, Inc. (Rockville, MD)
09/ 147,309
November 25, 1998
This invention was made with Government Support under Contract No. DE-FG01-95EE23796 awarded by the Department of Energy. The Government has certain rights in this invention.