Virtual image display device
US11353713B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 18, 2019 |
| Grant date | Jun 7, 2022 |
| Priority date | — |
| Expiry date | Sep 21, 2040 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B2027/0196
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A virtual image display device includes a projection optical system that includes a projection mirror that projects an image display light toward a virtual image presentation plate. The projection mirror has a concavely curved surface and is arranged such that a curvature in a second cross section intersecting the concavely curved surface is larger than a curvature in a first cross section intersecting the concavely curved surface. The second cross section is orthogonal to the first cross section. The display unit is provided at a focal point of a composite optical system within a meridional plane, the composite optical system being formed by the virtual image presentation plate and the projection optical system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.