Optical disk having read-exclusive and write-enable regions
US5214627A · kind A · utility
76Cited by
7References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 7, 1990 |
| Grant date | May 25, 1993 |
| Priority date | — |
| Expiry date | Feb 7, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/211
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical disk provided with read-exclusive regions where previously recorded information can be read, and with write-enable regions where information can be written. Information not desired to be rewritten can be recorded on the read-exclusive regions. The write-enable regions are open to users to freely add information thereto and to re-write information recorded. This optical disk can thus be used in various fields.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.