Optical disk having first and second recording areas with wobble frequencies that do not interfere with EFM signal
US5926453A · kind A · utility
28Cited by
7References
8Claims
0Family size
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Key dates
| Filing date | Aug 31, 1994 |
| Grant date | Jul 20, 1999 |
| Priority date | — |
| Expiry date | Aug 31, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/2545
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A recordable optical disc on which information is recorded by applying a light beam on the surface thereof, includes: a first recording area on which information is recorded and reproduced while the disc is rotated at a first linear velocity; and a second recording area on which information is recorded and reproduced while the disc is rotated at a second linear velocity. The first recording area and the second recording area include guide grooves having wobble frequency lower than frequency band of EFM signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.