Lighting apparatus
US4965876A · kind A · utility
Inventors
Key dates
| Filing date | May 26, 1989 |
| Grant date | Oct 23, 1990 |
| Priority date | — |
| Expiry date | May 26, 2009 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF21V7/09
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A lighting apparatus is provided having a plurality N of light sources arranged annularly around the optical axis of a reflector. The efficiency of such an apparatus and its service life are improved by providing a central mirrored column which is symmetrically disposed with respect to the light sources. The column has C.sub.N or D.sub.N symmetry and reflects light emitted by the light sources away from the light sources themselves, thereby reducing the amount of light reflected back at the light sources and reducing their thermal load. The column has peaks that extend into the notional annulus on which the light sources are arranged to shield adjacent light sources from each other.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.