Interior illumination apparatus using sunlight

Details Interior illumination apparatus using sunlight Interior illumination apparatus using sunlight

1980-04-09

1981-12-22

Wintercorn, Richard A.

B02B 1700

Patent

active

043067697

ABSTRACT:
An apparatus for collecting sunlight and directing the collected sunlight into the interior of the building to provide illumination, so that the energy used for artificial illumination can be conserved, includes a collector, a light pipe, and a diffuser. The collector includes an immovable flared trumpet-like hollow tube having a highly reflective interior surface and having its larger aperture oriented to maximize the sunlight received at a particular time of day. The larger aperture is closed by a transparent cap which supports a secondary reflector that extends forward of the larger aperture. The secondary reflector serves to reflect into the hollow tube light travelling at a low angle of incidence with respect to the larger aperture to compensate for the reduced efficiency of the larger aperture to low-angle light. The apparatus also includes a sprinkler for washing dust and other deposits from the transparent cap, and further includes a servo-controlled light valve for maintaining, to the extent possible, a constant level of illumination at a work station within the building.

REFERENCES:
patent: 494299 (1893-03-01), Lugrin
patent: 550376 (1895-11-01), Lugrin
patent: 585770 (1897-07-01), Lugrin
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patent: 1037668 (1912-09-01), Schwickart
patent: 1254520 (1918-01-01), MacDuff
patent: 2022144 (1935-11-01), Nicolson
patent: 3157089 (1964-11-01), Menefee
patent: 3511559 (1970-05-01), Foster
patent: 4040725 (1977-08-01), Goodbar

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