Optical recording medium, manufacturing method thereof, optical recording method, optical reproduction method, optical recording device, optical reproduction device and optical recording/reproduction device
US7177264B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Apr 22, 2003 |
| Grant date | Feb 13, 2007 |
| Priority date | — |
| Expiry date | Oct 3, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/2585
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical recording medium, with a construction and a manufacturing method thereof corresponding to those of a read-only optical recording medium and which can be manufactured inexpensively, which enables additional recording of the above-described codes, marks, and other new information, which can be recorded reliably and has satisfactory characteristics, is provided. A construction is adopted in which the optical recording medium S has an information layer 2 including a portion in which information is recorded by physical shape changes in, at least, the thickness direction or the track width direction, and which comprises a reflective film 3; the reflective film is formed of Al alloy or Cu alloy with an electrical resistivity of 20 μΩ·cm or more and 90 μΩ·cm or less, and information can be additionally recorded on the reflective film 3 by thermal recording.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.