Ultrasonic motor
US4736129A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 27, 1986 |
| Grant date | Apr 5, 1988 |
| Priority date | — |
| Expiry date | May 27, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02N2/163
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An ultrasonic motor includes piezoelectric resonators for generating vibration waves, an elastic vibration member along which an elastic wave propagates when driving of the piezoelectric resonators is driven, a sliding member located in contact with the elastic vibration member under pressure and adapted to slide along the elastic vibration member when the elastic wave propagates, and a friction member located on the sliding member and brought into frictional contact with the elastic vibration member, the friction member being made of a material having a hardness of less than 100 and larger than 94 measured by a spring A type hardness tester, a hardness of 40 to 120 measured by a Rockwell's R type hardness tester, hardness of 20 to 80 measured by a Rockwell's M type hardness tester, a hardness of 40 to 90 measured by a Shore A type hardness tester, or a hardness of 20 to 70 measured by a Shore D type hardness tester.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.