Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1978-09-18
1981-01-20
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
350262, 362276, 362 20, F21V 3300
Patent
active
042464773
ABSTRACT:
A sunlight collector, containing a Fresnel lens, is mounted on the roof of a building and tracks the sun during daylight hours. A concentrated beam of sunlight is directed through a light transmission channel to locations within the building where the light is distributed. The transmission channel utilizes a focusing lens for further concentrating the solar beam, refocusing lenses for correcting divergences in the beam, reflectors for redirecting the beam, and beam splitters for distributing the beam into light fixtures located throughout the interior of the building. The light fixtures contain filters for controlling the intensity and spectral content of the incoming beam, and optical elements for dispersing the beam. Additionally, the fixture contains rigidly mounted fluorescent tubes, providing artificial light, which are automatically energized when the solar light is insufficient for lighting purposes. A diffusing element is used for uniformly radiating both the artificial and the dispersed solar light from the fixture into the building interior.
REFERENCES:
patent: 507999 (1893-11-01), Davis
patent: 1254520 (1918-01-01), Macduff
patent: 3488505 (1970-01-01), Jentoft et al.
patent: 3511559 (1970-05-01), Foster
patent: 3902056 (1975-08-01), Aizenberg et al.
patent: 4023034 (1977-05-01), Schacht
patent: 4122334 (1978-10-01), Owens
M. A. Duguay et al., "Lighting with Sunlight Using Sun Tracking Concentrators"; Applied Optics, vol. 16, #5, May 1977; pp. 1444-1446.
Nelms David C.
R & D Associates
Westin Edward P.
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