Piezoelectric actuator
US6025671A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 10, 1998 |
| Grant date | Feb 15, 2000 |
| Priority date | — |
| Expiry date | Mar 10, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H57/00
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A piezoelectric actuator has at least one monolithic piezoelement of a piezoelectric material, having a tubular form and a penetrating bore extending along a longitudinal direction surrounded by a tubular wall. An inner electrode is provided on the inside of the tubular wall of each piezoelement. Correspondingly, an outer electrode is provided on the outside of the tubular wall of each piezoelement. When an electric voltage is applied between the inner electrode and the outer electrode, an electrical field is formed that is essentially aligned perpendicularly to the longitudinal direction of the tubular piezoelement, the electrical field effecting a deformation of the piezoelement in its longitudinal direction in order to exert an actuation force in the longitudinal direction of the piezoelement.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.