Standing-wave type ultrasonic motor and timepiece
US5079470A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 23, 1990 |
| Grant date | Jan 7, 1992 |
| Priority date | — |
| Expiry date | Apr 23, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02N2/0015
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A standing-wave type ultrasonic motor utilizing flexible standing-wave components. Protuberances are provided nearly at every other intermediate positions of the loops and the nodes of flexible standing-waves generated in the vibration member by the piezo-electric element or the electro-strictive element, and a moving member is brought into pressed contact with the protuberances so as to be frictionally driven. A standing-wave type ultrasonic motor is driven in the forward direction and in the reverse direction while fulfilling the reduction in size, stabilization in performance and improvement in efficiency. Furthermore, an analog-type electronic timepiece is obtained using display means that is driven by the standing-wave type ultrasonic motor, featuring reduced size and thickness.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.