Drive unit
US7898146B2 · kind B2 · utility
4Cited by
5References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 20, 2009 |
| Grant date | Mar 1, 2011 |
| Priority date | — |
| Expiry date | Nov 20, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10N30/2023
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A drive unit includes a vibration actuator for controlling the piezoelectric element. A control section controls the vibration actuator switchably between a normal operation mode in which the piezoelectric element vibrates at a predetermined frequency to let the vibration actuator output a driving force, and a heating mode in which the piezoelectric element vibrates in a direction perpendicular to a direction of the driving force at a frequency different from the frequency in the normal operation mode to heat the piezoelectric element.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.