Recording medium with judging area for track area identification based on wobbling polarity
US7239603B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 8, 2000 |
| Grant date | Jul 3, 2007 |
| Priority date | — |
| Expiry date | Jan 15, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/00736
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A recording and reproducing apparatus of the present invention includes a photo-detector having light receiving sections divided along the track direction of an optical disk. The apparatus also includes a wobble signal processing circuit for generating a wobbling polarity judging signal used in judging a wobbling polarity of a track being tracked by comparing phases of a first wobble signal detected from a difference signal of the outputs of the light receiving sections and a second wobble signal detected from a sum signal of the outputs of the light receiving signals. Consequently, whether the wobbled side wall of the track being tracked is the inner or outer radius of track can be judged in real time by a simple structure using one laser beam.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.