Illumination – Light source and modifier – With ventilating – cooling or heat insulating means
Patent
1989-02-10
1989-12-26
Husar, Stephen F.
Illumination
Light source and modifier
With ventilating, cooling or heat insulating means
362268, 362281, 362284, 362293, 362301, 350315, 350316, F21V 2900
Patent
active
048902080
ABSTRACT:
The disclosed stage lighting apparatus includes a constant-direction beam forming unit and an adjustable beam redirector for aiming the beam at a wide range of locations varying in azimuth and elevation, and programmable remote-control equipment for the various adjustments of the beam-forming unit and the beam redirector. The beam-forming unit comprises a lamp and a heat-absorbing ellipsoidal reflector acting with the lamp to provide a beam; a heat-extracting filter in the path of the beam comprising a chamber containing circulated liquid that absorbs infra-red and a dichroic filter that reflects infra-red and is cooled by the circulated liquid of the chamber; an adjustable filter in the path of the beam comprising three elongated mutually overlapping subtractive color filters and a neutral brightness control filter, each filter having densities varying from clear to a maximum; an adjustable beam shaper; and adjustable beam-focussing lenses, all of which provides a constant-direction beam, the beam then being adjustably directed to the stage.
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Drawing and Descriptive Sheet "Horizontal Beam Water-Coded Spotlight" by G. C. Izenour.
Thesis: Jack Wentz-"Design of a Microprocessor Controlled Theater Lighting Instrument" Dated Sep. 25, 1985-Library of Lehigh University.
Husar Stephen F.
Lehigh University
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