Fluorescent sunlamp having controlled ultraviolet output
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United States of America Patent
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Jun 18, 1985
Grant Date -
N/A
app pub date -
Apr 8, 1982
filing date -
Apr 8, 1982
priority date (Note) -
Expired
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Abstract
An inert coating of calcium pyrophosphate in finely-divided form is provided on the inner surface of the envelope of a fluorescent sunlamp underneath the phosphor layer to reduce the emission of undesirable short-wavelength ultraviolet radiation (190 nm to 260 nm region). The relative densities of the phosphor layer and undercoating of calcium pyrophosphate are so correlated that the ratio of short-wavelength ultraviolet radiation to erythemal radiation is maintained below a prescribed limit. The particles of calcium pyrophosphate are also larger than about 1 micron and are thus adapted to selectively absorb the undesirable short-wavelength radiations and provide an integral UV-filtering means for the sunlamp.
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