Information medium substrate and information medium
US7989099B2 · kind B2 · utility
0Cited by
15References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 25, 2007 |
| Grant date | Aug 2, 2011 |
| Priority date | — |
| Expiry date | Jun 25, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/26
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An information medium substrate is formed as a flat plate and includes a first convex part formed on one surface of the information medium substrate in a region between a rim part of a center hole and an inner circumferential edge of an information region and a second convex part formed on another surface of the information medium substrate at a position that overlaps a protruding end part of the first convex part in a thickness direction of the information medium substrate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.