Light source device, lightguide element, and surface illumination device
US10754084B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 23, 2017 |
| Grant date | Aug 25, 2020 |
| Priority date | — |
| Expiry date | Oct 26, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/0078
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A light source device includes a light source configured to emit illumination light and a flat plate shaped transparent lightguide element. The lightguide element includes: an incident surface facing the light source; a reflecting surface formed in one of side surfaces of the lightguide element to reflect the illumination light incident into the lightguide element from the incident surface; and an exit surface formed in a side surface of the lightguide element on an opposite side to the reflecting surface, the illumination light reflected by the reflecting surface exiting from the exit surface. The reflecting surface is formed into a curved surface, the curved surface collimating the illumination light reflected by the reflecting surface in a surface including a lengthwise direction of the reflecting surface, and the reflecting surface is formed into a concave mirror in a surface including a short direction of the reflecting surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.