Optical pickup, optical information recording and reproducing apparatus and method for optically recording and reproducing information
US8004950B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Feb 27, 2008 |
| Grant date | Aug 23, 2011 |
| Priority date | — |
| Expiry date | Oct 2, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/1378
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical pickup for recording a hologram by using an angle multiplexing method. An optical beam is separated into two beams, a signal beam and a reference beam having different convergence/divergence degrees, by using an optical component such as a diffraction lens. The signal and reference beams are made incident upon the same objective, and the optical component or the objective lens is moved in a direction perpendicular to an optical axis, to thereby realize angle multiplex recording. If an optical information recording medium is inclined, the optical component or the objective lens is moved along the direction along which the optical information recording medium moved to change an angle of the reference beam incident upon the optical information recording medium and compensate for degradation of a reproduction signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.