Linear illumination lens with Fresnel facets
US7559672B1 · kind B1 · utility
135Cited by
21References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 23, 2008 |
| Grant date | Jul 14, 2009 |
| Priority date | — |
| Expiry date | May 23, 2028 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF21Y2115/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A linear Fresnel lens for LED illumination is configured initially by using a meridional flux-assignment method and is then corrected by assessing the three-dimensional flux distribution of individual facets. The facet angles are slightly altered as required to produce uniformity. A variety of specialized lens shapes are generated, such as for illuminating shelves in commercial refrigerator food-display cases. The lens shapes are suitably thin for economical production by extrusion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.