System and method for recording of information on a holographic recording medium, preferably an optical card
US7315501B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 4, 1999 |
| Grant date | Jan 1, 2008 |
| Priority date | — |
| Expiry date | May 4, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B20/00876
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The invention relates to a method for the recording and reading of data with a holographic write/read apparatus onto a holographic recording medium with a thin holographic recording layer. The medium is preferably an optical card (2). The recording of the information is in the form of data pages stored as thin Fourier holograms (61). According to the invention, it is foreseen to use reflected transmission and polarisation holography with different write and read wavelengths, and to correct during reading the distortion in the readout channel caused by the difference between the write and read wavelengths. The invention further relates to an apparatus and system for performing the method. There is also disclosed a method of coding the recorded information.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.