Integrated piezoelectric and thermal asperity transducers for testing disc media in high performance disc drives
US5872311A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 24, 1997 |
| Grant date | Feb 16, 1999 |
| Priority date | — |
| Expiry date | Apr 24, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B33/10
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A device for testing smoothness of a rotatable disc is disclosed. A slider body has a trailing edge surface and an air-bearing surface for gliding over a surface of the disc when the disc is rotating. A piezoelectric sensor is formed in the slider body, and a thermal asperity sensor is formed in the slider body and at least partially exposed to the air-bearing surface. A plurality of conductive vias extend from the trailing edge surface of the slider body into the slider body to contact the piezoelectric and thermal asperity sensors. A plurality of conductive bond pads are disposed on the trailing edge surface in contact with respective conductive vias.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.