Discharge lamp having overlaid fluorescent coatings and methods of making the same
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United States of America Patent
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Jul 19, 2005
Grant Date -
May 20, 2004
app pub date -
Jun 16, 2003
filing date -
Jun 14, 2002
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Disclosed is a new and useful discharge lamp for use in applications, such as tanning and technical lighting, and a method of making the same. The discharge lamp includes, inter alia, a vitreous tube having an axial length, a base phosphor coating applied on the interior of the tube along the entire axial length, and at least one phosphor over-coat applied over the base phosphor coating in one or more axial regions of the vitreous tube. The phosphor over-coat is applied to less than the total length of the vitreous tube. In a representative embodiment, the vitreous tube has an outer periphery which is smooth, but in alternate embodiments, a helical groove path is formed therein over at least a portion of the axial length.
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