Polarized light recuperation apparatus
US6830339B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 8, 2002 |
| Grant date | Dec 14, 2004 |
| Priority date | — |
| Expiry date | Jul 8, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/286
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention provides a method and a device for optical polarization recuperation for producing a substantially polarized light beam from an unpolarized light beam comprising first and second polarizations.The device according to the invention comprises:an optical circuit having an entrance side with an aperture for receiving incoming light rays, and an exit area for allowing light rays to exit the optical circuit, the light rays following a first light path between the aperture and the exit area,a reflective polarizer means adjacent the exit area of the optical circuit, for transmitting light rays having the first polarization and for reflecting back into the optical circuit light rays which have the second polarization, the light rays having the second polarization following a second light path in the optical circuit,a mirror with a hole in it at the entrance side of the optical circuit, for reflecting those light rays following the second light path which fall onto it, the hole forming at least the aperture, anda quarter wave or an odd multiple of quarter wave retarder means through which at least a part of the light emitted from the optical circuit passes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.