Hologram recording device, hologram reproduction device, hologram recording method, and hologram reproducing method
US7489427B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 18, 2005 |
| Grant date | Feb 10, 2009 |
| Priority date | — |
| Expiry date | Jul 13, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03H1/265
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In recording of an interference fringe of a reference beam and a signal beam in a hologram recording medium, at the time of multiple recording of holograms in the same recording region by varying the angle of incidence of the reference beam on the hologram recording medium, the angular pitch of the incidence angle of the reference beam is varied according to the incidence angle of the reference beam in the manner of Δθ1, Δθ2, . . . , Δθm−1, and is thereby set to a minimum in such a range as not to worsen crosstalk. This makes it possible to increase the degree of multiplexing when the movable angle of the reference beam is the same, and to narrow the movable angle of the reference beam when the degree of multiplexing is the same, as compared with the related art.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.