Optical element and illumination unit
US9404638B2 · kind B2 · utility
5Cited by
4References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 24, 2013 |
| Grant date | Aug 2, 2016 |
| Priority date | — |
| Expiry date | Nov 8, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10H20/855
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An optical element according to the present invention includes a light receiving surface which is designed to cover an emitting surface of a planar light source device, a reflecting surface, a light exit surface which is contiguous to the periphery of the reflecting surface. When the center of the emitting surface is designated as a point O and an axis which passes through the point O and is perpendicular to the emitting surface is designated as an optical axis of the optical element, the reflecting surface has a concave portion around the optical axis and an outer edge surrounding the concave portion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.