Electrically controllable carrying-arm arrangement
US4150407A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 28, 1977 |
| Grant date | Apr 17, 1979 |
| Priority date | — |
| Expiry date | Oct 28, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/08576
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An electrically controllable carrying arm arrangement for a magnetic disc store and comprising a carrying arm which at one of its ends carries a number of magnetic heads and at its other end is provided with a drive coil with the aid of which the carrying arm is pivoted, so that the magnetic heads are moved over the surface of a storage disc. The drive coil has a flat shape and a small thickness and moves in an air gap between two flat axially magnetized permanent magnets which belong to a stator of the arrangement. Preferably, the drive coil and the carrying arm are disposed in one plane which is perpendicular to the pivoting axis of the carrying arm, so that a compact unit is obtained which demands little mounting height. When a multiple carrying arm arrangement is desired, a plurality of carrying arms of the type described hereinbefore are stacked onto each other with intermediate spacings, while the stator construction is also obtained by stacking a plurality of stators. However, when n individual carrying arms are used and thus n separate stators, it suffices to use n+1 permanent magnets so that each magnet which is disposed between two drive coils cooperates with both drive c…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.