Optical disk, disk substrate, and drive
US7027385B1 · kind B1 · utility
10Cited by
18References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 8, 1999 |
| Grant date | Apr 11, 2006 |
| Priority date | — |
| Expiry date | Nov 8, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B23/0313
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical disk 100 is provided with a hub 3 at the central portion of a substratel. A relationship Y/X≧0.015, preferably Y/X≧0.05 is satisfied where X is the projected area of the substrate 1 and Y is a contact area between the hub 3 and the substrate 1. As result, no slippage occurs between the hub 3 and the substrate 1 even when they are rotated at high speed than conventional. With this higher rotational speed, the data transfer rate is improved, and irregular rotation and the camming are suppressed, thereby reducing tracking errors and write/read errors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.