Fluorescent lamp having integral light-filtering means and starting aid
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United States of America Patent
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Feb 19, 1985
Issued Date -
N/A
app pub date -
Jul 13, 1983
filing date -
Nov 25, 1980
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Reliable starting of a fluorescent lamp that is designed to emit light of a selected color (red, for example) is achieved by using a thin transparent coating of conductive material (such as tin oxide) on the inner surface of the glass envelope in combination with a first overlying layer of a suitable light-filtering pigment material and a second overlying layer of a suitable phosphor. The resulting multi-layered arrangement of such materials and the phosphor eliminates the need for including additives (such as admixed silica and barium sulfate) in the phosphor coating as starting aids and solves the problems of poor light output and unreliable starting which are created by the use of such additives. Multiple layers of pigment material having the proper coating density can also be used.
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