Single stage track seek method
US4980876A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 3, 1988 |
| Grant date | Dec 25, 1990 |
| Priority date | — |
| Expiry date | Oct 3, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/08517
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A seek method for disk drive is described. In the seek method of the present invention, the tracking servo loop remains in a track positioning mode throughout the entire seek process. By effectively varying the reference position of the head with respect to track center under a predetermined profile, the track positioning mode is utilized to produce a pseudo-continous movement across the disk surface. In essence, the servo track following loop attempts to mainta position relative to a local track center as dictated by profile information supplied by a microprocessor. The system of the present invention is an open loop in the sense that no attempt is made to loop information about deviation from the predefined profile back to the microprocessor. Local positioning, however, remains closed loop at all times so that the system is always within the predicted track and arrives directly on target.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.