DSA suspension having PZT with overhanging constraint layer and electrical connection thereto
US9330696B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 31, 2015 |
| Grant date | May 3, 2016 |
| Priority date | — |
| Expiry date | Jul 31, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/5552
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A PZT microactuator such as for a hard disk drive has a restraining layer bonded on its side that is opposite the side on which the PZT is mounted. The restraining layer comprises a stiff and resilient material such as stainless steel. The restraining layer can cover most or all of the top of the PZT, with an electrical connection being made to the PZT where it is not covered by the restraining layer. 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. The restraining layer may extend beyond the edge of the PZT to define an overhang, with the electrical connection being made by bonding to the underside of the overhang thus reducing and controlling the height of the assembly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.