Piezoelectric vibrator for ultrasonic motor
US7932661B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Sep 23, 2008 |
| Grant date | Apr 26, 2011 |
| Priority date | — |
| Expiry date | Apr 13, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10N30/50
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In the invention, each piezoelectric element for a vibrator for an ultrasonic motor has electrode regions for exciting stretching vibration and flexural vibration separately. Thus, the invention provides a vibrator for an ultrasonic motor, in which electrodes are provided for applying voltage to each of the polarized region, and further provides a stack-type piezoelectric vibrator for an ultrasonic motor, consisting of a stack of the said vibrators and having an extraction electrode pattern provided for short circuit with an external electrode. The vibrator of the invention has high controllability, especially in a fine movement region and is useful as a driving source in a positioning device, in which enhanced vibration efficiency can be obtained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.