Seek in a disc drive with nonlinear pivot friction
US6636375B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 31, 2000 |
| Grant date | Oct 21, 2003 |
| Priority date | — |
| Expiry date | Oct 29, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/5556
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
According to one embodiment of the present invention, a disc drive includes a disc and a transducer supported by an actuator assembly that is accelerated by controlling current in a voice coil. The disc drive controls a position of the transducer over a present track on the disc in a track-and-follow mode, generates an estimated bias current to be applied to the voice coil to balance a bias on the actuator assembly when the transducer is over the present track, starts a movement of the transducer toward a target track in a seek mode, enters the estimated bias current into a bias table if an immediately preceding movement of the transducer in the seek mode was longer than a seek length boundary such that nonlinear friction in a pivot in the actuator assembly is less substantial, and applies a bias current to the voice coil calculated based on a bias current entry in the bias table during the seek mode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.