Piezoelectric actuator with wrap-around electrode on inactive constraining layer
US9330699B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 24, 2015 |
| Grant date | May 3, 2016 |
| Priority date | — |
| Expiry date | May 24, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/5552
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A piezoelectric actuator such as for a hard disk drive or other application has a restraining layer on its side that is opposite the side on which the PZT is mounted. The restraining layer is a stiff material. The restraining layer reduces bending of the PZT as mounted and hence increases effective stroke length, or reverses the sign of the bending which increases the effective stroke length of the PZT even further. For simplicity of construction and assembly to the suspension, the PZT actuator may be a multi-layer PZT with the top layer being unpoled or otherwise inactive PZT material, and having a wrap-around electrode so that the actuator can be mechanically and electrically bonded to the suspension or other environment using a single adhesive dispense and cure step.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.