Optical path length adjuster
US7798648B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 6, 2005 |
| Grant date | Sep 21, 2010 |
| Priority date | — |
| Expiry date | Dec 24, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N13/395
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical path length adjuster enables electro-optical control of a physical path length between two optical elements, suitable for use in the adjustment of an optical path length within three dimensional display devices that generate a virtual image within a defined imaging volume. The adjuster varies an optical path length between an input optical path and an output optical path and includes: a first polarization switch for selecting a polarization state for an input beam on the input optical path; first and second beam splitters having at least two possible optical paths of different lengths therebetween, for passing the input beam along a selected one of said at least two possible optical paths according to the selected polarization state of the input beam and for providing an output beam of light, on said optical output path, that has traveled along the selected optical path.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.