Method for recording and reproducing holographic data and holographic recording medium
US7206108B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 15, 2004 |
| Grant date | Apr 17, 2007 |
| Priority date | — |
| Expiry date | May 13, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/0938
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A holographic recording and reproducing method for recording holographic data in and reproducing holographic data from a holographic recording medium including 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 and an optical modulation pattern periodically formed in a direction of a track on a surface located 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, the holographic recording and reproducing method including a step of projecting a light beam for servo control onto the holographic recording medium so as to substantially focus onto the surface on which the optical modulation pattern is formed, thereby generating clock signals in synchronism with the optical modulation pattern.According to the thus constituted holographic recording and reproducing method, it is possible to generate accurate clock signals and remove noise superposed on a reproduced light beam.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.