Hologram recording device
US7755819B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 14, 2008 |
| Grant date | Jul 13, 2010 |
| Priority date | — |
| Expiry date | Mar 14, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03H2225/24
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A hologram recorder (A2) includes: a light source (10) for emitting a coherent beam; a spatial light modulator (20) provided with unit areas having a plurality of beam reflection elements (21) to reflect the beam from the light source (10) in a main direction as a signal beam or a cut-off direction; and a signal beam optical system (30, 31) for directing the signal beam to the hologram recording medium (B). The recorder (A2) further includes: a wavefront reshaper (40, 41, 42) for condensing the beams thinned out in the cut-off direction by the beam reflection element (21) of the modulator (20), and reshaping the wavefront of the condensed beams; and a reference beam optical system (50, 51) for directing the beam from the reshaper (40, 41, 42) to the recording medium (B) as a reference beam to be shone in an overlapping manner with the signal beam.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.