Air bearing head displacement sensor and positioner
US4605977A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 14, 1983 |
| Grant date | Aug 12, 1986 |
| Priority date | — |
| Expiry date | Dec 14, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/6058
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic head slider for supporting a flying head on a magnetic disk has a plurality of rails extended longitudinally between the slider and the disk which provide the air bearing surface and define a channel parallel to the motion of the data track. A flexible beam is affixed to the leading edge of the channel providing a cantilever structure. A magnetic head is mounted on the free end of the cantilever. A pair of oppositely polarized piezoelectric crystals are mounted on the cantilever assembly. When energized by an electrical driving source, the cantilever beam is flexed upwards or downwards thereby changing the distance of the magnetic head from the disk. A capacitive proximity sensor is coupled to the magnetic head for sensing the height of the head above the data track. The output of the sensor is fed to the driving source and energizes the piezoelectric crystals in the polarity desired for the corresponding deflection of the cantilever structure. Thus, the sensor continuously monitors the height of the magnetic head from the track and provides a correction signal to maintain the transducer at a constant predetermined height above the track. In a preferred embodiment, the b…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.