Fluorescent sunlamp having controlled ultraviolet output
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 shortwavelength 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.
- Assignee:
- North American Philips Corporation
- Patent Number(s):
- US 4524299
- OSTI ID:
- 6471236
- Resource Relation:
- Patent File Date: Filed date 8 Apr 1982; Other Information: PAT-APPL-366890
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
FLUORESCENT LAMPS
COATINGS
CALCIUM PHOSPHATES
FILTRATION
OPTICAL PROPERTIES
PARTICLE SIZE
PHOSPHORS
ULTRAVIOLET RADIATION
WAVELENGTHS
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
ELECTROMAGNETIC RADIATION
LIGHT BULBS
OXYGEN COMPOUNDS
PHOSPHATES
PHOSPHORUS COMPOUNDS
PHYSICAL PROPERTIES
RADIATIONS
SEPARATION PROCESSES
SIZE
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