Magnetic recording medium and method of making the same
US6029895A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Feb 4, 1999 |
| Grant date | Feb 29, 2000 |
| Priority date | — |
| Expiry date | Feb 4, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K19/06196
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A magnetic recording medium, and a method of making the same, including an irreversible recording layer which undergoes an irreversible change of saturation magnetization upon heating. The magnetic recording medium includes on at least a portion of a substrate an irreversible recording layer which contains an irreversible recording material undergoing an irreversible change of saturation magnetization upon heating. The irreversible recording layer includes at least in part a fixed information recording region for recording the fixed information of the medium. In the fixed information recording region, a plurality of heated bars whose saturation magnetization has been irreversibly changed are arrayed substantially parallel to each other. The array pattern of the heated bars or the array pattern of unheated bars disposed between adjacent ones of the heated bars contains the fixed information encoded in a frequency modulation process or phase modulation process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.