Multilayer optical information recording medium, optical head, and optical drive
US7940628B2 · kind B2 · utility
1Cited by
7References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 30, 2006 |
| Grant date | May 10, 2011 |
| Priority date | — |
| Expiry date | Apr 30, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/0938
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A disclosed optical recording medium includes multiple recording layer units in each of which one or more recording layers and one or more middle layers are stacked alternately; and one or more spacer layers. In the disclosed optical recording medium, the recording layer units and the spacer layers are stacked alternately in a depth direction of the optical recording medium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.