Method and apparatus for recording hologram, method and apparatus for reproducing hologram, and information retaining body
US7319550B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 8, 2004 |
| Grant date | Jan 15, 2008 |
| Priority date | — |
| Expiry date | Jul 18, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K2019/0629
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
While Fourier transformation of a signal light beam is performed to perform recording during holographic recording so that a focal point is formed outside a holographic recording layer (defocus recording), an aperture is arranged on an outgoing side of the reproduced signal light beam (reproduction light beam), the reproduction light beam is focused at the aperture, and low-order components of a Fourier transform image of the reproduction light beam are selectively transmitted to detect only the transmitted light beam. Therefore, information recorded as the hologram in the holographic recording layer can be reproduced with high S/N ratio from the holographic recording layer added onto a support body, particularly onto a sheet member having non-optical quality such as paper and a plastic card.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.