Method for recording and reproducing holographic data and holographic recording medium
US7313072B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 19, 2004 |
| Grant date | Dec 25, 2007 |
| Priority date | — |
| Expiry date | Jun 25, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/24044
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A holographic recording medium includes a recording layer in which data are to be recorded as phase information of light by projecting a signal beam and a reference beam thereonto, a reflective surface disposed on the opposite side of the recording layer as viewed in the direction of signal beam and reference beam incidence on the holographic recording medium and formed with a convex pattern or a concave pattern having a trapezoidal cross-section, a minimum width of a convex surface of the convex pattern or a concave surface of the concave pattern being set equal to or larger than a beam spot diameter of the signal beam or the reference beam at a diffraction limit thereof. According to the thus constituted holographic recording medium, it is possible to easily remove noise light contained in a signal beam and a reference beam.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.