Piezoelectric vibrator and ultrasonic motor having piezoelectric vibrator
US7644619B2 · kind B2 · utility
2Cited by
10References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 19, 2006 |
| Grant date | Jan 12, 2010 |
| Priority date | — |
| Expiry date | Aug 18, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02N2/026
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A piezoelectric vibrator and an ultrasonic motor having the piezoelectric vibrator. A piezoelectric vibrator has a multilayered piezoelectric actuator, with special internal and surface electrodes making the body vibrate in a longitudinal and bending direction when an electrical signal is inputted. It can be manufactured using conventional multilayer piezoelectric actuator manufacturing techniques, therefore, it has reduced manufacturing time and cost, as it is not necessary to go through two polarization processes, and may simplify and decrease the volume, while improving the vibration performance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.