Servo system for data storage apparatus
US4400747A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 26, 1981 |
| Grant date | Aug 23, 1983 |
| Priority date | — |
| Expiry date | Jun 26, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/59688
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The servo system includes the use of servo signals of four types such that each group of four adjoining servo tracks identifies the center line of a data track of interest and presents unique signals from the respective four servo tracks. The analog value of the signals are stored and sensed to provide a substantially linear position error signal over a three-track wide region. By using variable gain with respect to the analog signals, compensation for the variance between data head width and track pitch, and a quadrature servo portion, linearity can be achieved. In addition, since the substantially linear region is three tracks wide and the position error signal does not become ambiguous over a width of four tracks, a one-track seek can be accomplished using an error signal rather than a seek.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.