NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Ultraminiature Broadband Light Source and Method of Manufacturing SameAn ultraminiature light source using a double-spiral shaped tungsten filament includes end contact portions which are separated to allow for radial and length-wise unwinding of the spiral. The double-spiral filament is spaced relatively far apart at the end portions thereof so that contact between portions of the filament upon expansion is avoided. The light ource is made by fabricating a double-spiral ultraminiature tungsten filament from tungsten foil and housing the filament in a ceramic package having a reflective bottom and a well wherein the filament is suspended. A vacuum furnace brazing process attaches the filament to contacts of the ceramic package. Finally, a cover with a transparent window is attached onto the top of the ceramic package by solder reflow in a second vacuum furnace process to form a complete hermetically sealed package.
Document ID
20100029670
Acquisition Source
Headquarters
Document Type
Other - Patent
Authors
Tuma, Margaret L.
(NASA Glenn Research Center Cleveland, OH, United States)
Collura, Joseph S.
(Lighting Innovations Corp. Cleveland, OH, United States)
Helvajian, Henry
(Aerospace Corp. Los Angeles, CA, United States)
Pocha, Michael D.
(Lawrence Livermore National Lab. Livermore, CA, United States)
Meyer, Glenn A.
(Lawrence Livermore National Lab. Livermore, CA, United States)
McConaghy, Charles F.
(Lawrence Livermore National Lab. Livermore, CA, United States)
Olsen, Barry L.
(Lawrence Livermore National Lab. Livermore, CA, United States)
Hansen, William W.
(Lawrence Livermore National Lab. Livermore, CA, United States)
Date Acquired
August 25, 2013
Publication Date
July 13, 2010
Subject Category
Optics
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Patent
NASA-Case-LEW-1782D-1|US-Patent-7,755,292 B1
Patent Application
US-Patent-Appl-SN-11/625,545
No Preview Available