Optical information recording/reproducing apparatus
US6339564B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 12, 2000 |
| Grant date | Jan 15, 2002 |
| Priority date | — |
| Expiry date | Dec 12, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/0912
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical information recording/reproducing apparatus records information on and/or reproduces information from an optical recording medium based on a reflected light beam from the optical recording medium. The apparatus includes a light splitting part having a plurality of light splitting stages which split the reflected light beam from the optical recording medium into a plurality of light beams, and a photodetector unit including a plurality of photodetectors which receive the plurality of light beams from the light splitting part. The photodetector unit includes a plurality of photodetectors which receive light beams used to detect a focal error, at least one photodetector which receives a light beam used to detect a tracking error, and a plurality of photodetectors which receive light beams used to detect magneto-optic information recorded on the optical recording medium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.