Reproducing apparatus and reproducing method
US9245570B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 1, 2014 |
| Grant date | Jan 26, 2016 |
| Priority date | — |
| Expiry date | Jul 1, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/1395
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Provided is a reproducing apparatus including: an optical system that obtains a signal light by radiating light emitted from a light source and generates a reference light from the light emitted from the light source, with respect to a recording medium, and that generates first to fourth groups of the signal light beams and the reference light beams, with respect to the superposed light in which the signal light and the reference light are superposed onto each other; a light receiving unit that receives light beams of the first to fourth groups of the signal light beams and the reference light beams respectively through first to fourth light receiving elements; and a reproduction signal generation circuit that calculates a first differential signal and a second differential signal, and that generates a reproduction signal by performing an arithmetic operation using the first and second differential signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.