Lighting assembly with a light guide having light-redirecting edge features
US9170364B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 4, 2013 |
| Grant date | Oct 27, 2015 |
| Priority date | — |
| Expiry date | Jan 3, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/0085
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A lighting assembly includes a light source to emit on-axis light rays at smaller angles relative to an optical axis of the light source, and off-axis light rays at larger angles relative to the optical axis and spectrally different from the on-axis light rays. The lighting assembly additionally includes a light guide having a light input edge adjacent the light source and opposed major surfaces between which light from the light source propagates by total internal reflection. The light input edge has an edge feature aligned with the light source to receive light therefrom. The edge feature specularly redirects the on-axis light rays and the off-axis light rays differently to increase overlap between the on-axis light rays and the off-axis light rays within the light guide. The increased overlap reduces spatial color variation of light extracted from the light guide between locations at different angles from the optical axis.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.