Fluorescent sunlamp having controlled ultraviolet output

Details Fluorescent sunlamp having controlled ultraviolet output Fluorescent sunlamp having controlled ultraviolet output

1982-04-08

1985-06-18

Moore, David K.

Electric lamp and discharge devices

With luminescent solid or liquid material

With gaseous discharge medium

313489, 313112, H01J 6138, H01J 6140

Patent

active

045242992

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.

REFERENCES:
patent: 2447210 (1948-08-01), Roberts
patent: 2563900 (1951-08-01), Wollentin et al.
patent: 2563901 (1951-08-01), Nagy et al.
patent: 3310418 (1967-03-01), Friedman et al.
patent: 3715612 (1973-02-01), Someya et al.
patent: 3764840 (1973-10-01), Shiraishi
patent: 3890522 (1975-06-01), Klein
patent: 4069441 (1978-01-01), Wanmaker et al.
patent: 4079288 (1978-03-01), Maloney et al.
patent: 4199708 (1980-04-01), Lauwerijssen et al.

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