Lensed indirect luminaire with side angle brightness control
US4698734A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 1, 1984 |
| Grant date | Oct 6, 1987 |
| Priority date | — |
| Expiry date | Jun 1, 2004 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF21Y2113/00
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An indirect luminaire which has an opaque housing that masks light directed downwardly of the luminaire is provided with an elevated light source, that is, a light source which is elevated relative to the side walls of the luminaire housing. Luminaire lenses extend upwardly from the side walls to receive generally laterally directed light and to redirect same. The luminaire lenses are formed to receive laterally directed light from the elevated light source and to refract same in a direction near or above the horizontal plane of the fixture such that the pervasive problem of excessive brightness in certain prismatic surfaces is substantially eliminated. Also disclosed is two level lighting employing an elevated light source and a lens in accordance with the invention and a second light source directly beneath the elevated light source in an over/under relation. The disclosed two level lighting provides two levels of light without disturbing the symmetry of the light distribution pattern of the luminaire.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.