Light source device
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United States of America Patent
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Sep 23, 2014
Grant Date -
Mar 27, 2014
app pub date -
Sep 20, 2013
filing date -
Sep 21, 2012
priority date (Note) -
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Abstract
A filament of simple structure showing improved conversion efficiency is provided. There is provided a light source device comprising a light-transmitting gas-tight container, a filament disposed in the light-transmitting gas-tight container, and a lead wire for supplying an electric current to the filament, wherein the filament consists of a single crystal. Sum of concentration of lattice defects and impurity concentration of the filament consisting of a single crystal is preferably lower than 0.01%.
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