Magnetic recording medium and method of making the same
US6202926A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Feb 4, 1999 |
| Grant date | Mar 20, 2001 |
| 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 methods of making and reading the same, including 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 invention involves the steps of previously heating the irreversible recording layer to form an initial heated region in which a plurality of heated bars whose saturation magnetization has been irreversibly changed are arrayed in a bar code pattern, and converting unheated bars disposed between the heated bars into a heated state for changing the array pattern of heated bars, thereby recording the information.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.