Optical element, illumination device including the optical element, and illumination module including the illumination device
US9857051B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 9, 2014 |
| Grant date | Jan 2, 2018 |
| Priority date | — |
| Expiry date | Oct 28, 2035 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF21Y2115/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An optical element is provided. When in a xz cross section, an angle which a ray travelling from the origin at θr forms with the normal to the light receiving surface is designated as φx, an angle which a ray travelling from b in the z axis direction forms, after the surface, with the z axis direction is designated as θib, in a yz cross section, an angle which a ray travelling from the origin at θr forms with the normal to the light receiving surface is designated as φy, angles which a ray travelling from a in the z axis direction forms, after the light receiving and exiting surfaces, with the z axis direction are designated as θia and θea, and an angle which a ray travelling from the origin at arctan(a/ha) forms, after the light exiting surface, with the z axis direction is designated as θeha,φy>φx (0<θr<60°)θeha>45°θea>45°θia>θib are satisfied.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.