Closed-loop fly height control using transfer function between harmonic response and heater input
US10204650B1 · kind B1 · utility
1Cited by
11References
20Claims
0Family size
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Key dates
| Filing date | Aug 13, 2018 |
| Grant date | Feb 12, 2019 |
| Priority date | — |
| Expiry date | Aug 13, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2005/0021
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Gain values used by a variable gain amplifier (VGA) to read servo marks of a heat-assisted recording medium are measured. Sector-specific, repeatable gain values that indicate an expected VGA gain at a desired clearance are determined based on the measured gain values. The sector-specific, repeatable gain values are used as input to a closed-loop clearance controller together with measured values of servo VGA gain while writing data to the recording medium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.