Lighting fixture having concave shaped reflector and improved asymmetric light reflection system
US4799136A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 29, 1987 |
| Grant date | Jan 17, 1989 |
| Priority date | — |
| Expiry date | May 29, 2007 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF21Y2103/00
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A lighting fixture adapted for uniformly illuminating a wall surface by utilizing an asymmetric light reflection pattern. The fixture includes a support housing and an elongated concave-shaped reflector which is pivotably attached to the support housing and has multiple facet surfaces arranged for reflecting light from the centrally located light source out through a front opening, which is covered with an ultraviolet filtering glass diffusion plate. The reflector has major rear and minor front reflecting portions, each portion containing multiple facet surfaces arranged in upper and lower zones with varying angles measured relative to a central vertical plane selected for reflecting light from the light source uniformly out through the diffusion plate to provide an asymmetric lighting pattern for uniformly illuminating a wall surface. The lighting fixture is usually mounted from a ceiling and directed to uniformly illuminate a vertical wall surface so as to avoid hot spots, scallops and striations on the illuminated surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.