Illumination – Elongated source light unit or support – Housing
Patent
1980-08-04
1982-10-26
Walsh, Donald P.
Illumination
Elongated source light unit or support
Housing
362 3, 362 16, 362347, 350292, 350293, 350296, F21S 300
Patent
active
043565387
ABSTRACT:
An electronic strobe light which can either be built into or detachably connected with a photographic camera to provide a preferred illumination distribution over the field of view of the camera in order to maximize flash range and improve the quality of illumination for flash pictures. The strobe light includes a reflector that is bilaterally symmetric about the horizontal having a shape represented by a 6th order polynomial and a strobe tube which has its center offset with respect to the plane of symmetry of the reflector. This arrangement provides a vertically asymmetric distribution in the intensity of illumination over the picture area with higher intensities occurring at the central upper part of the picture area. Side-to-side illumination intensity is generally symmetric about the vertical and is controlled by a cylindrical Fresnel lens.
REFERENCES:
patent: 3553705 (1971-01-01), Ondrejka
patent: 3609332 (1971-09-01), Schindler
patent: 4017727 (1977-04-01), Yamamoto
patent: 4027151 (1977-05-01), Bartnel
patent: 4173036 (1979-10-01), Ferguson
patent: 4194234 (1980-03-01), Geissler
patent: 4298909 (1981-11-01), Krief
Goldberg, et al.; "Analysis of Para-Elliptic Reflector", Journal of the Optical Society of America, vol. 39, No. 6, pp. 497-500.
Caufield Francis J.
Polaroid Corporation
Walsh Donald P.
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