Light source employing a wavelength conversion device with a light introducing device and a light collecting device
US9851071B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 7, 2011 |
| Grant date | Dec 26, 2017 |
| Priority date | — |
| Expiry date | Dec 7, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2209/043
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A light source comprising an excitation light source for providing excitation light, and an optical wavelength conversion member disposed at a distance from the excitation light source. The optical wavelength conversion member comprises an optical wavelength conversion material for converting the excitation light into stimulated light. The light source also comprises an optical-guiding member that allows the excitation light to be incident on the optical wavelength conversion material, and an optical-collecting member for collecting converted light originating from the optical wavelength conversion material. To separate the paths of the converted light and the excitation light, the etendue of the optical-guiding member is less than or equal to ¼ of the etendue of the optical-collecting member. This allows the optical-guiding member to draw in the excitation light while preventing the excessive escape of the converted light through the optical-guiding member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.