Edge-lit illumination system
US6568821B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 21, 2000 |
| Grant date | May 27, 2003 |
| Priority date | — |
| Expiry date | Dec 21, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/0065
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An edge-lit illumination system comprising a light transmitting sheet (10) which has a surface treatment, capable of reflecting or scattering light, on at least one of its opposing surfaces (11, 12), a light source (13) positioned in proximity to, and adjacent to, an edge of this sheet, and a reflective surface (14) positioned adjacent to an edge of the sheet, at an obtuse angle (18) to the plane of the sheet and extending away from one surface of the sheet. The reflective surface is preferably disposed adjacent to the edge of the light transmitting sheet having the light source adjacent to it. The obtuse angle preferably ranges from 100 to 145 degrees. This invention gives an increase in the area of illumination across the light transmitting sheet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.