High frequency and low frequency servo pattern
US6710967B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 28, 2001 |
| Grant date | Mar 23, 2004 |
| Priority date | — |
| Expiry date | Nov 1, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/584
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Servo tracks combine low frequency transitions for fine transverse positioning with high frequency fields providing additional information. In one embodiment, each servo frame has a first field of recorded low frequency transitions, a second field of recorded low frequency transitions, and at least one high frequency field. The first low frequency field transitions are recorded on the tape such that a peak of each first field transitions varies in longitudinal position across the width of the servo frame. The second field of low frequency transitions are recorded on the tape such that a peak of each second field transition is not parallel with the peak of any first field transition. High frequency fields may provide one or more of timing information, longitudinal position information and gross transverse position information.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.