Vibration driven apparatus
US5155407A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 7, 1990 |
| Grant date | Oct 13, 1992 |
| Priority date | — |
| Expiry date | Dec 7, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02N2/08
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In a vibration wave driven motor having a vibration member having an electro-mechanical energy conversion element secured to one surface of a resilient member of an elliptical shape formed by straight portions and arcuate portions, and a member brought into pressure contact with the other surface of the resilient member and wherein AC voltages having a phase difference of 90.degree. therebetween in terms of time are applied to the driving phases of the electro-mechanical energy conversion element divided into two phases to thereby generate a travelling vibration wave in the resilient member, whereby the vibration member and the member brought into pressure contact therewith are moved relative to each other, the two driving phases of the electro-mechanical energy conversion element are polarization-processed in such a manner that only one travelling wave is formed in the straight portions of the resilient member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.