Disc-shaped recording medium and disc driving system
US6462903B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 30, 2000 |
| Grant date | Oct 8, 2002 |
| Priority date | — |
| Expiry date | Mar 30, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/59627
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A disc-shaped recording medium for which information signals are recorded and/or reproduced in a state in which a rotating recording and/or reproducing head is floated a pre-set distance from a signal recording region carrying surface of the disc-shaped recording medium. The disc-shaped recording medium has an area radially outside of the outer perimeter of center opening by at least 0.1 mm clamped by a clamp mechanism. This area is coplanar as each surface of the disc-shaped recording medium carrying the signal recording region. It is possible in this manner to prevent eccentricity of the rotating disc-shaped recording medium and consequent collision of the recording and/or reproducing head against the disc-shaped recording medium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.