Illumination device and projection device
US12306522B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 26, 2022 |
| Grant date | May 20, 2025 |
| Priority date | — |
| Expiry date | Sep 22, 2043 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B33/08
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An illumination device including a laser light source, a first wavelength selective element, and a wavelength conversion element is provided. The laser light source provides a laser beam. The first wavelength selective element has different transmittances for the laser beam incident at different angles. In a first mode of the illumination device, the laser beam is incident on the first wavelength selective element at a first angle, and the laser beam is reflected by the first wavelength selective element. In a second mode of the illumination device, the laser beam is incident on the first wavelength selective element at a second angle greater than the first angle, and the laser beam penetrates the first wavelength selective element. The wavelength conversion element converts the laser beam into a first converted light beam. A projection device using the illumination device is also provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.