Positioning coarse servo actuator of tape servo system to allow fine servo actuator to follow tape shift excursions
US8027121B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 4, 2009 |
| Grant date | Sep 27, 2011 |
| Priority date | — |
| Expiry date | Dec 3, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/584
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Methods, servo systems, and data storage drives follow the lateral shift excursions of longitudinal tape, for example, from flangeless tape guides. A servo sensor is configured to sense lateral position of a tape head with respect to longitudinal servo tracks of the tape, a fine actuator is configured to translate the head laterally, and a coarse actuator is configured to translate the fine actuator laterally. Position error is determined between the head and a desired position related to the servo track, and the fine actuator operated to translate the head laterally to reduce the position error. In the embodiment, lateral shift excursion is sensed from the position error, and the coarse actuator is positioned substantially at a midpoint of the lateral shift excursion. Thus, the fine actuator follows the lateral shift excursions, while the coarse actuator remains at the midpoint.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.