Illumination – Light source and modifier – Including reflector
Patent
1982-05-10
1984-11-06
Walsh, Donald P.
Illumination
Light source and modifier
Including reflector
362 80, 362 83, 362297, 362346, 362347, 350600, 364525, F21V 700
Patent
active
044815638
ABSTRACT:
An automotive headlight has a clear unfluted front cover and a reflector which directs light from a source through the front cover in a desired pattern. The reflective surface is smooth and continuous formed of two edge ellipsoids and a center ellipsoid joined in smooth continuous junctions. The center ellipsoid is modified to include a smooth vertical bump and the ellipsoids are tilted off the axis of the headlight. The headlight is formed by a digital computer aided process which includes tracing the paths of a plurality of light rays emanating from a digitally modeled light source, intersecting a reflector modeled by digital shape functions and projected onto a sphere surrounding the reflector. The light intensity across a part of the sphere is compared with the prescribed automotive headlight specifications. The parameters of the shape functions are changed and the process is performed iteratively to produce a light intensity best matching the specifications.
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Donohue, et al., "Computer Design of Automotive Lamps W/Faceted Reflectors", Journal of IES/Oct. 72, pp. 36-42.
Lucas Electrical Limited, Publication No. 3995/RL-6, Issue 1, 1982.
Snyder Edward A.
Teter Michael P.
Corning Glass Works
Kurtz R. E.
Turner B. R.
Walsh Donald P.
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