Method and apparatus for encoding and direct overwriting of magneto-optic data
US4872078A · kind A · utility
12Cited by
9References
22Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 9, 1987 |
| Grant date | Oct 3, 1989 |
| Priority date | — |
| Expiry date | Dec 9, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B11/10536
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Direct overwrite of data on magneto-optic medium is described. Old data is erased and new data is written during a single rotation of the media in a data storage system which includes a resonant coil for producing a high frequency alternating magnetic field interacting with laser pulses having a duration equal to a small fraction of the period of the magnetic field. Variable-length magnetic domains are formed by overlapping circular magnetic domains to provide pulse width modulation (PWM) encoding of data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.