Contact detection and calibration for electrostatic fly height control in a disc drive
US6700724B2 · kind B2 · utility
79Cited by
8References
28Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 9, 2002 |
| Grant date | Mar 2, 2004 |
| Priority date | — |
| Expiry date | Apr 9, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/6035
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A disc drive includes a head with an air bearing surface that provides a fly height spacing. A fly height spacing control system provides a control signal to a head electrical connection on a head and a disco electrical connection on a disc. Fly height is controlled electrostatically. A disconnect circuit couples the control signal to the disc electrical connection. The disconnect circuit provides a disconnection of the control signal when contact is sensed. A contact sensor senses an electrical current component of the control signal that indicates contact between the head and the disc.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.