Piezoelectric actuator system with position detection function and method thereof
US7550896B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 7, 2008 |
| Grant date | Jun 23, 2009 |
| Priority date | — |
| Expiry date | Jul 7, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10N30/802
Abstract
A piezoelectric actuator system with a position detection function includes an immovable base, a piezoelectric material, a drive shaft, and a movable part. The immovable base has a driving circuit for providing a driving voltage. The piezoelectric material is fixed on the immovable base and electrically coupled to the driving circuit. A length of the piezoelectric material is controlled by the driving voltage. The drive shaft is fixed on the piezoelectric material and has at least two conductive parts having impedance materials. The movable part is disposed on the drive shaft, and a spacer made of a conductive material is installed at its bottom. The two conductive parts are electrically coupled to the spacer, so as to form a conduction path. The driving circuit detects an impedance of the conduction path to determine a position of the movable part.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.