Illumination – Light source and modifier – Including selected wavelength modifier
Patent
1980-06-30
1982-03-23
Lechert, Jr., Stephen J.
Illumination
Light source and modifier
Including selected wavelength modifier
362294, 362311, 362373, F21V 900
Patent
active
043216595
ABSTRACT:
A simple, light-weight air-cooled filter arrangement for a narrow band pass filtered light fixture. In lighting fixtures such as infrared energy sources or stage lighting, it is necessary to filter a conventional broad spectrum energy source so that only energy in the desired region is transmitted. These filters which absorb energy in bands other than that being transmitted tend to become very hot. A light fixture is provided having a plurality of spaced filters near a light output end. Each filter has one or more openings offset from the openings in other filters so that no single straight path passes through openings in all filters. A light source is provided adjacent to the filter pack, with a fan positioned on the side of the source opposite the filter pack, with openings in the fixture housing beyond the fan. In operation, the filter pack absorbs energy in all spectral regions other than the band which the pack was designed to pass. The fan draws air in through the filter pack, past the light source and ejects it out through the openings. This fixture is simple, light-weight and cool in operation.
REFERENCES:
patent: 3180981 (1965-04-01), Ulffers
patent: 3831021 (1974-08-01), Muhlogger
Gilliam Frank D.
Lechert Jr. Stephen J.
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