Thermal radiant source with filament encapsulated in protective film
AssigneesInstrumentarium Corp., Vaisala Oy
InventorsMartti Blomberg, Markku Orpana, Ari Lehto, Hannu Kattelus
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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.
Claims25
An electrically modulatable radiant source, comprising:
- an essentially planar substrate;
- a well or hole formed into the substrate;
- at least one incandescent filament attached to the substrate, said incandescent filament being aligned at said well or hole, said incandescent filament being formed from a metallic compound which readily oxidizes at an operating temperature of said incandescent filament;
- an oxidation resistant film encapsulating said incandescent filament to prevent said filament from oxidizing;
- and
- contact pads formed onto the substrate at both ends of the incandescent filament for feeding electric current to the incandescent filament.
Dependencies are inferred from the claim text.