Compact apparatus for reading from and/or writing to holographic storage media
US7859751B2 · kind B2 · utility
0Cited by
4References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 20, 2007 |
| Grant date | Dec 28, 2010 |
| Priority date | — |
| Expiry date | Aug 24, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/1369
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A compact apparatus for reading from and/or writing to holographic storage media and polarizing filter for use in such an apparatus includes a substrate with an outer zone and an inner zone, the outer zone and the inner zone having different optical properties for a first direction of polarization and a second direction of polarization, and a wave plate attached to the substrate for influencing the polarization of the a light beam, wherein a part of the wave plate corresponding to either the outer zone or the inner zone is switchable.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.