Illumination device and vehicle lamp
US11454363B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 15, 2019 |
| Grant date | Sep 27, 2022 |
| Priority date | — |
| Expiry date | May 15, 2039 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF21S45/47
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An illumination device includes a light source and a light guide including a first light guide portion and a second light guide portion. The second light guide portion contains a light-emitting face, and the excitation light emitted by the light source is coupled and enters the first light guide portion and is emitted via the light-emitting face of the second light guide portion. The area of the cross section, perpendicular to a light guide central line, of the second light guide portion is gradually decreased in the direction of an optical axis of the light source. An angle between an intersecting line of the light-emitting face of the second light guide portion and the cross section passing through the light guide central line or any tangent line of the intersecting line and the light guide central line is an acute angle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.