Drive unit
US7679265B2 · kind B2 · utility
4Cited by
6References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 5, 2008 |
| Grant date | Mar 16, 2010 |
| Priority date | — |
| Expiry date | May 5, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10N30/2023
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A drive unit includes a guide, a stage which is movable relative to the guide, an ultrasonic actuator for moving the movable body and a control unit for controlling the ultrasonic actuator. The ultrasonic actuator includes a driver element in contact with the stage and is fixed to the guide. A surface of the stage in contact with the driver element is an undulating surface. The control unit detects the position of the stage based on a change in contact pressure on the driver element due to the undulating surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.