Calibration disk having discrete bands of composite roughness
US6408677B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 7, 2000 |
| Grant date | Jun 25, 2002 |
| Priority date | — |
| Expiry date | Sep 28, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2005/0016
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A calibration disk includes calibration areas that allow a glide head to be calibrated as to the glide's head's avalanche height, fly height and the like. The calibration areas may be, for example, configured in a circumferential band (or, alternatively, a series of circumferential bands extending substantially concentric to one another), one or more spiral bands or some other suitable configuration. Such bands can, for example, extend from adjacent an outer diameter of the calibration disk to adjacent an inner portion of the calibration disk. Each of the circumferential bands is a textured area on the calibration disk having a given degree of composite roughness, as measured by the given circumferential band's average composite roughness height, and as such is referred to herein as a calibration band. Preferably, the given circumferential band is textured in a uniform manner, sufficient to produce a constant and continuous output signal from a sensor mounted on a glide head when the glide head flies lower than a maximum composite roughness height. Also preferably, the average composite roughness height within an individual calibration band is substantially uniform, and the average…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.