Optical multiplexer and image projection apparatus using the same
US11422452B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 10, 2020 |
| Grant date | Aug 23, 2022 |
| Priority date | — |
| Expiry date | Oct 10, 2040 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/3135
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical multiplexer includes: an incident surface on which incident light beams having different wavelengths are to be incident; a reflection portion configured to reflect the incident light beams; and an emission surface configured to emit reflected light beams reflected by the reflection portion. The incident surface has adjacent condenser lenses corresponding to the respective incident light beams. The reflection portion has adjacent reflection surfaces configured to reflect the respective incident light beams which have been condensed. The adjacent reflection surfaces are respectively disposed so that angle β formed by the respective reflected light beams reflected by the adjacent reflection surfaces is smaller than angle α formed by the respective incident light beams which have been condensed. The emission surface has diffraction grating in which the respective reflected light beams reflected by the adjacent reflection surfaces are to be incident at a same position and diffracted in a same direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.