System, method and apparatus for direct head-disk clearance measurement by slider vibration and fly height calibration
US7724462B2 · kind B2 · utility
6Cited by
11References
15Claims
0Family size
Assignee
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Key dates
| Filing date | Aug 1, 2008 |
| Grant date | May 25, 2010 |
| Priority date | — |
| Expiry date | Aug 1, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/6005
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method models and calibrates the fly height of a slider above the disk for disk drives. The calibration scheme uses the Wallace spacing loss equation and laser doppler velocimetry to predict fly height and detect the actual fly height of the slider. The slider is vibrated at selected resonances, such as by capacitive coupling to the disk, and the fly height is gradually reduced. In one version, contact between the slider and disk may be detected using an arm electronics sensor. The amplitude of mean-to-peak, vibration detection is used as an indication of the actual fly height and to calibrate the modeled fly height.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.