Motorless bias-field device and method having magnetic coupling between a magnetic and the recording element for inverting the magnetic field
US5768220A · kind A · utility
2Cited by
6References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 14, 1997 |
| Grant date | Jun 16, 1998 |
| Priority date | — |
| Expiry date | Feb 14, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B11/1056
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A bias-field device for a magneto-optical system having a magneto-optical recording element which includes a conductive substrate and which moves through a magnetic field created by the bias-field device so that information is selectively recorded on or erased from the recording element, the device comprises: a rotatable magnet that rotates so that when the recording element rotates the conductive substrate creates a magnetic coupling with the magnet for causing the magnet to rotate; and an escapement mechanism that releases and latches the magnet for permitting the magnet to be selectively rotated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.