Narrow-band, air-cooled light fixture
US4321659A · kind A · utility
Inventor
Key dates
| Filing date | Jun 30, 1980 |
| Grant date | Mar 23, 1982 |
| Priority date | — |
| Expiry date | Jun 30, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/133308
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.