Image combiner and image display
US7085027B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 24, 2005 |
| Grant date | Aug 1, 2006 |
| Priority date | — |
| Expiry date | Oct 24, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B2027/0116
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The light from the image forming element 2 is reflected by the PBS 8, and is incident on the λ/4 plate 7 so that this light is converted into circularly polarized light. Subsequently, the light is subjected to a reflection/diffraction effect and image focusing effect by the reflective type HOE 6. Then, this light again passes through the λ/4 plate 7, and is transmitted through the PBS 8. As a result, the light enters the eye of the user after being synthesized with light from the outside world. The system is devised so that the relationships of −5<θ1<5 and |θ1−θ2|<3 are established between the angle of incidence θ1 (°) at which the principal rays emitted from the center of the display part of the image forming means are incident on the reflective type holographic optical element, and the reflection/diffraction angle θ2 (°) when this light is diffracted/reflected by the reflective type holographic optical element. This makes it possible to achieve the improvement of the image quality of the display image in cases where the center of the pupil of the eye of the user deviates from the center of the exit pupil of the image combiner.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.