Virtual image display device shifting light of an image to create a virtual image
US11448880B2 · kind B2 · utility
0Cited by
3References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 27, 2019 |
| Grant date | Sep 20, 2022 |
| Priority date | — |
| Expiry date | Nov 8, 2040 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B2027/0121
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A light guide unit forms an optical path to guide a display light emitted from a display unit toward a projection portion. The light guide unit includes a negative optical element and a positive optical element. The negative optical element is placed on the optical path and has a negative optical power. The positive optical element is placed on the optical path and is closer to the projection portion than the negative optical element. The positive optical element has a positive optical power. The positive optical element is a diffractive optical element having a diffractive structure configured to diffract the display light.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.