Apparatus for applying magnetic field and magneto-optical disk storage having such apparatus
US5291345A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Jul 19, 1991 |
| Grant date | Mar 1, 1994 |
| Priority date | — |
| Expiry date | Jul 19, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B11/1056
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An apparatus for applying a magnetic field has a permanent magnet, pivotally supported, which has an approximate cylindrical shape, respective semicircles of a circular section thereof being magnetized as N and S poles, and a driving coil, located in the vicinity of the permanent magnet so that the permanent magnet can partially penetrate inside the loops of the driving coil, the rotation and the positioning of the permanent magnet being controlled by the strength and/or directions of current flow in the driving coil. The apparatus is used for a magneto-optical disk storage. Since the driving coil is close to the permanent magnet, the pivoting of the permanent magnet can be controlled with a fast response. In addition, the apparatus can be made relatively small.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.