Optical information-recording medium and optical information recording/reproducing method
US7102990B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 2, 2002 |
| Grant date | Sep 5, 2006 |
| Priority date | — |
| Expiry date | Sep 19, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/2562
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical information-recording medium comprises (a) a disk-shaped substrate having a first main surface and a second main surface opposite to the first main surface; an incidence surface of the medium being located to be nearer to the first main surface than the second main surface; (b) a recording layer formed on the substrate; and (c) a signal generation layer formed on the substrate in such a way as to be nearer to the incident surface than the recording layer. The signal generation layer allows an incident light beam irradiated to the incidence surface to pass through and allows a reflected light beam from the recording layer to pass through. The signal generation layer includes a transmittance changing region having a transmittance with respect to the incident light beam different from its neighborhood, thereby generating a repeated transmittance change according to rotation of the medium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.