Optical disc medium having clamping region with protruding structures
US8006256B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 20, 2007 |
| Grant date | Aug 23, 2011 |
| Priority date | — |
| Expiry date | May 23, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2007/0013
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A recording layer is described that is at least partially or entirely positioned at a distance T7 of less than 0.4 mm with respect to the second surface. When the optical recording medium is clamped in a drive, the recording layer has a “higher” position than a recording layer of a known DVD. The layer structure of the described optical recording medium reduces the thickness of the disc in an area of the recording layer. In particular, a thickness T1 of only 0.4 to 0.7 mm is possible while maintaining the reliability of the optical recording medium (i.e. without reading problems in most or all drives). Further, the optical recording medium may have only one substrate, i.e. only one disc of polycarbonate, whereas the other side of the recording layer is only covered by a protective lacquer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.