Method and apparatus for inverting a bias field for magneto-optic recording and erasing
US6044042A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 20, 1998 |
| Grant date | Mar 28, 2000 |
| Priority date | — |
| Expiry date | Mar 20, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B11/1056
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A bias-field apparatus 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 comprising: a support member; a magnet mounted for rotation in the support member such that when the recording element rotates the conductive substrate creates a magnetic coupling with the magnet for causing said magnet to rotate; and a ferromagnetic element having a coil disposed thereon that releases said magnetic for rotation when the coil is energized, and prevents rotation when said coil is de-energized for permitting said magnet to be selectively rotated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.