Image projection device
US10659743B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Apr 26, 2016 |
| Grant date | May 19, 2020 |
| Priority date | — |
| Expiry date | Apr 3, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B2027/0178
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An image projection device includes: a first mirror oscillating to scan an image light beam forming an image projected onto a retina of a user; a light source emitting the image light beam and a detection light beam to the first mirror at different timings; a second mirror having a first region reflecting the image light beam reflected by the first mirror to the retina and a second region reflecting the detection light beam reflected by the first mirror in a direction different from a direction in which the image light beam is reflected, and scanning neither the image light beam nor the detection light beam reflected by the first mirror; a detector detecting the detection light beam reflected by the second region; and a controller adjusting oscillation of the first mirror and an emission timing of the image light beam based on a detection result by the detector.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.