Reproduction apparatus and reproduction method
US11335371B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 4, 2017 |
| Grant date | May 17, 2022 |
| Priority date | — |
| Expiry date | Apr 17, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/1395
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A reproduction apparatus dividing a cross section of superposed light into a plurality of regions in a tangential and/or radial direction includes: an optical system configured to generate each of a first set of signal light and reference light having a phase difference of approximately 0°, a second set of signal light and reference light having a phase difference of approximately 180°, a third set of signal light and reference light having a phase difference of approximately 90°, and a fourth set of signal light and reference light having a phase difference of approximately 270°, using a plurality of superposed light beams corresponding to the divided regions; an optical receiver configured to output signals corresponding to the sets of the signal light and the reference light; and a circuit configured to compute signals as differences between the signals, and obtain a reproduction signal by computation from the computed signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.