Optical recording medium, method of making the same and optical memory device using the optical memory medium
US6728194B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 24, 1999 |
| Grant date | Apr 27, 2004 |
| Priority date | — |
| Expiry date | Nov 24, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/24085
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical recording medium including a substrate, an information recording region arranged on the substrate and capable of bearing information being readable with predetermined light, and a tracking region arranged on the substrate, having optical characteristics different from those of the information recording region and having substantially no difference in level with respect to the surface of the information recording region. A method of making an optical recording medium, including the steps of forming uniformly a recording layer on a substrate, the recording layer being made of a recording material being reversibly reactive to predetermined light, and causing an irreversible reaction in a partial region of the recording layer without causing a substantial difference in level with respect to the other region of the recording layer. An optical memory device including the foregoing optical recording medium, an exposing device having a head for emitting evanescent light to the optical recording medium, a drive device for driving the head, and a control device for controlling the drive device to perform tracking of the head in accordance with the tracking region.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.