Thermal radiant source with filament encapsulated in protective film
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United States of America Patent
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Jul 1, 1997
Grant Date -
N/A
app pub date -
Jun 23, 1995
filing date -
Jun 23, 1994
priority date (Note) -
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Abstract
An electrically modulatable radiant source includes an essentially planar substrate, a well or hole formed in the substrate, and at least one incandescent filament attached to the substrate. The incandescent filament is aligned with the well or hole and is formed of a metallic compound which readily oxidizes at an operating temperature of the incandescent filament. An oxidation resistant film encapsulates the incandescent filament to prevent the filament from oxidizing. Furthermore, contact pads are formed on the substrate at both ends of the incandescent filament for feeding electric current to the incandescent filament.
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