Method and system for measuring fly height
US6865040B2 · kind B2 · utility
44Cited by
13References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 21, 2001 |
| Grant date | Mar 8, 2005 |
| Priority date | — |
| Expiry date | Mar 5, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/20
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A system and method for measuring the fly height of a head flying over a disc in a disc drive is disclosed. A head is vertically spaced from a rotating disc surface by an air bearing surface. The disc has one or more radial grooves in the surface of the disc. As the disc rotates, the radial grooves on the disc pass under the head and induce a perturbation in the signal. By measuring the perturbations in the signal caused by the grooves in the disc surface, and by processing the measurement signal, a vertical spacing signal proportional to the vertical spacing between the disc and the head can be obtained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.