Illumination – Elongated source light unit or support – Housing
Patent
1975-11-14
1978-01-31
Griffin, Donald A.
Illumination
Elongated source light unit or support
Housing
362339, F21V 500
Patent
active
040717500
ABSTRACT:
A lamp includes a light source having a center and a light diffuser disc having two opposite faces and supported at a distance from the light source. One face of the light diffuser disc is provided with a prism structure which is symmetrical with respect to a normal that passes through the center of the light source and that is perpendicular to the faces of the light diffuser disc. The prism structure is formed of a plurality of prisms extending parallel to one another; each prism has a frontal flank oriented towards the normal and a rear flank oriented away from the normal. The angle of inclination of the frontal flanks gradually decreases from prism to prism in a direction away from the normal, while the angle of inclination of the rear flanks gradually increases at a decreasing rate, from prism to prism towards an upper limit value in a direction away from the normal.
REFERENCES:
patent: 1707038 (1929-03-01), Bauersfeld
patent: 1746852 (1930-02-01), Champeau
patent: 2318716 (1943-05-01), Rolph
patent: 2474317 (1949-06-01), McPhail
patent: 2474341 (1949-06-01), Wince
patent: 2732488 (1956-01-01), Wince
patent: 3502865 (1970-03-01), Matteson
patent: 3721818 (1973-03-01), Stahlhut
Kramer Heinrich
Pepping Franz
Schneppendahl Richard
Griffin Donald A.
Nova-Lux-Gesellschaft Brandenburg & Co.
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