Curved light guide, imaging optical unit and HMD
US11385465B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 23, 2018 |
| Grant date | Jul 12, 2022 |
| Priority date | — |
| Expiry date | Oct 6, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B2027/0174
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A curved light guide can be used as an imaging optical unit or as part of an imaging optical unit for an HMD. The light guide can be arranged in front of at least one eye and have a concave curvature, as seen from the eye. The light can include a back surface facing the eye and a front surface facing away from the eye, an input coupling structure for coupling light into the light guide in such a way that light is guided through the light guide with reflection at the front surface and/or the back surface, and an output coupling structure for coupling out the light guided through the light guide. The light guide can have a diverging structure, the absolute value of the focal length of which is less than or equal to the radius of curvature of the light guide.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.