Optical: systems and elements – Having significant infrared or ultraviolet property – Having ultraviolet absorbing or shielding property
Patent
1990-09-21
1991-11-19
Arnold, Bruce Y.
Optical: systems and elements
Having significant infrared or ultraviolet property
Having ultraviolet absorbing or shielding property
252588, 252589, 359885, 359892, G02B 522
Patent
active
050660829
ABSTRACT:
Apparatus for use in sunbathing comprises a screen formed of a sheet of thermoplastic or fiber material which is transparent to the safe UV-A wavelengths of solar radiation and the visible light range between 400-450 nm but which contains uniformly distributed therethrough a first agent which absorbs at least 80% of the UV-B radiation in the 310-320 nm range and all radiation below 310 nm, and a second agent and third agent which prevent transmission therethrough of some radiations above 450 nm wavelength, i.e. visible light and infra-red. The second agent may be an absorbing dye or pigment. The third agent may be finely divided carbon or ground glass. The screen may be mounted on a frame or fabricated into clothing so as to shield the sunbather from the acutely and chronically harmful wavelengths of radiation, to prevent unpleasant overheating, and to provide subdued lighting. The relatively small amount of UV-B transmitted through the material stimulates the production of new melanin in a sunbather, and this melanin will be later available for tanning by UV-A radiation.
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Arnold Bruce Y.
B.V. Interlad
Isaf Louis T.
Lerner Martin
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