Light guide element, light guide unit and illumination device
US10816714B2 · kind B2 · utility
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1References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 22, 2017 |
| Grant date | Oct 27, 2020 |
| Priority date | — |
| Expiry date | Aug 22, 2037 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF21Y2115/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A light guide element includes: an incidence surface wherefrom light enters from a light source; a first reflection surface configured to totally reflect at least a portion of the light entering from the incidence surface; a second reflection surface configured to totally reflect at least a portion of the light totally reflected by the first reflection surface as parallel light; and an emission surface configured to emit the parallel light totally reflected by the second reflection surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.