Three-dimensional tungsten structure for an incandescent lamp and light source comprising said structure
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United States of America Patent
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Issued Date -
Dec 2, 2004
app pub date -
Aug 20, 2003
filing date -
Jan 11, 2002
priority date (Note) -
Abandoned
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Abstract
A three-dimensional structure in the form of filament (6) for an incandescent lamp comprises a plurality of tungsten microfilaments (6A) having micrometric and/or nanometric dimensions, to form a photonic crystal structure. The microfilaments (6A) are arranged so as to form a series of microcavities in the three-dimensional structure (6), a means having a refraction index different from that of tungsten being present within said microcavities. The described arrangement makes it possible to prevent propagation and spontaneous emission of IR radiation of specific wavelenghts e allows at the same time propagation and spontaneous emission of visible radiation.
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