Optical recording medium, information recording apparatus and information reproduction apparatus
US7848215B2 · kind B2 · utility
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2Claims
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Key dates
| Filing date | Mar 24, 2006 |
| Grant date | Dec 7, 2010 |
| Priority date | — |
| Expiry date | Oct 7, 2029 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/21
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical-recording medium is provided with at least a first recording layer for recording information optically; and a second recording layer for recording information optically by a light beam that passes through said first recording layer; wherein the track pitch of a recording track that is formed on said second recording layer is narrower than the track pitch of a recording track that is formed on said first recording layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.