Clearance distance verification and control
US9001451B1 · kind B1 · utility
7Cited by
19References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 12, 2013 |
| Grant date | Apr 7, 2015 |
| Priority date | — |
| Expiry date | Aug 12, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/607
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Method and apparatus for verifying and controlling a clearance distance of an object, such as but not limited to a fly height of a read/write transducer adjacent a recording medium in a data storage device. In accordance with some embodiments, a sensor is used to sense a plurality of patterns from an adjacent surface, with each pattern being written at a different constant frequency. A final clearance distance between the sensor and the surface is established in response to a multi-frequency response ratio from the sensor and a single frequency response ratio from the sensor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.