Rotary actuator for a direct access storage device
US5267110A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 19, 1991 |
| Grant date | Nov 30, 1993 |
| Priority date | — |
| Expiry date | Mar 19, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/5521
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A rotary actuator head driver for a direct access storage device includes a transducer head moving in a radial direction across a disk surface for reading and/or writing data on a plurality of tracks for storing data. A support arm supports the transducer head relative to the disk surface. The support arm is connected to a pivot defining an axis of rotation spaced from the transducer head. A head driver positions the transducer head over one track in a track following mode or moves the transducer head from one track to another track in a seek mode. The head driver generates oppositely directed forces to produce a net torque applied to the support arm through the pivot. The oppositely directed forces have a line of action orthogonal a dominant motion of the transducer head. As a result, any parasitic force is orthogonal to the dominant motion and does not contribute to track misregistration errors. When the oppositely directed forces have an equal magnitude for force cancellation, the effect parasitic forces are eliminated. The head driver includes a pair of miniature voice coil motors or an in-the-hub motor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.