Track following servosystem for data storage apparatus
US4115823A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 27, 1977 |
| Grant date | Sep 19, 1978 |
| Priority date | — |
| Expiry date | Jun 27, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/59688
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A data storage apparatus, such as an accessing head magnetic disk file, includes at least one data disk surface and a servo disk surface. In operation, a continuous position signal having high frequency components is derived from the servo surface, which has a quadature type servo signal prerecorded thereon. A circuit means modifies the derived position signal so that a substantially linear signal representing the displacement of the servo head from the servo track is obtained. A second position signal having a low frequency component is obtained from servo sector information registered on the data disk surface and together with the first position signal forms a hybrid position signal. This hybrid signal is used to control the movement of the data heads relative to the data tracks to ensure optimum transducing operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.