Optical element and light-emitting device
US8616746B2 · kind B2 · utility
Assignees
Inventor
Key dates
| Filing date | Nov 17, 2009 |
| Grant date | Dec 31, 2013 |
| Priority date | — |
| Expiry date | Jul 17, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/0021
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Provided are an optical element and a light-emitting device with which the illuminated area can be expanded in spite of a small light-emitting area, and that also enable the device to be downsize. The light-emitting device is equipped with sheet-like light-guide sections (a first light-guide section and a second light-guiding section) for guiding light, and a light-emitting member for emitting light. The second light-guide section has a prism section with a saw tooth-like cross-section for changing the direction of the light guided to one of its surfaces. In the prism section, the angle of incidence at which parallel light guided to the second light guide section enters reflective surface of saw teeth at positions away from the LED is set to be greater than the angle of incidence (δ) at which the light enters the reflective surface of the saw teeth at the side toward the LED. In addition, in the prism section, the angle of protrusion of the saw teeth at positions away from the LED is set to be greater than the angle of protrusion of the saw teeth at the side toward the LED.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.