Erasable optical data storage medium and method and apparatus for recording data on the medium
US4912696A · kind A · utility
19Cited by
7References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 20, 1988 |
| Grant date | Mar 27, 1990 |
| Priority date | — |
| Expiry date | Dec 20, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/248
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An erasable optical data storage medium including a substrate and a dual layer of a first material and a second material on the substrate. The dual layer is susceptible to expansion and contraction, to writing data thermally, to erasing data thermally and mechanically, and to reading data optically, the first material and the second material, respectively, being bonded together and remaining in the same physical state upon the expansion and relaxation of the dual layer. Methods and apparatus are also disclosed for recording data bits on the medium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.