Optical polarization device and projection system of liquid crystal valve type utilizing such a device
US5900973A · kind A · utility
14Cited by
3References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 23, 1996 |
| Grant date | May 4, 1999 |
| Priority date | — |
| Expiry date | May 23, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/7441
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical polarization device including a source of light emitting a light beam, and a polarization beam splitter for reflecting the s-polarization component of the light beam and transmitting the p-polarization component. A Fresnel structure with a reflective coating receives the s-polarization component, rotates it 90 degrees and returns it to the beam splitter. A plate of micro-prisms, functioning in reflection total, recombine the two polarization components of the light beam so as to produce a collimated beam.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.