Constructive occlusion lighting system with ported cavity and fan structure
US6286979A · kind A · utility
Inventors
Key dates
| Filing date | Feb 24, 2000 |
| Grant date | Sep 11, 2001 |
| Priority date | — |
| Expiry date | Feb 24, 2020 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF21V11/02
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An optical integrating cavity supplies light or other radiant energy through a port to a deflector. The deflector coupled to the port may form a "fan" extending along one side or around all or part of the circumference of the cavity. Preferred embodiments use principles of constructive occlusion (diffuse reflectivity in a mask and cavity structure) together with the port and deflector structure. The cavity and mask serve as the optical integrating cavity. The constructive occlusion provides a tailored intensity distribution for radiant energy illuminating a first region; whereas the integrating cavity, port and deflector distribute another portion of the electromagnetic energy over a second field of intended illumination. The first and second areas illuminated may overlap slightly, or one may include the other, but preferably most of the two areas are separate. In some cases, the system configuration creates a dead zone between the two regions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.