Vibration control of piezoelectric microactuator
US6600619B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 30, 1999 |
| Grant date | Jul 29, 2003 |
| Priority date | — |
| Expiry date | Dec 30, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/596
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A system and method for controlling vibration of a piezoelectric microactuator in a disc drive are disclosed. The mechanical strain on the piezoelectric microactuator is ascertained and fed back to a controller which provides an electrical signal to the piezoelectric microactuator based upon the sensed strain. The electrical signal provided to the piezoelectric microactuator produces a mechanical force on the microactuator which counteracts the sensed strain. In one embodiment, a bridge circuit is coupled to the piezoelectric microactuator. The bridge circuit is adapted to sense a voltage across the piezoelectric microactuator and to separate the voltage across the piezoelectric microactuator into a voltage externally applied to the piezoelectric microactuator and a voltage induced on the piezoelectric microactuator by mechanical strain.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.