Control apparatus and control method for vibration wave driven apparatus
US7755251B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 10, 2008 |
| Grant date | Jul 13, 2010 |
| Priority date | — |
| Expiry date | Sep 10, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02N2/163
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A vibration wave driven apparatus capable of preventing a resonance frequency of a vibrator from being shifted to a frequency side higher than a fixed drive frequency of the vibrator during the execution of phase difference control or voltage control. Driving signals are supplied from a control apparatus to a vibration-type actuator having a piezoelectric element that functions as an electro-mechanical energy conversion element. To control the drive of the vibration-type actuator, either a phase difference between the driving signals or a voltage of the driving signals is changed. When either the phase difference or the driving signal voltage is changed, the frequency of the driving signals is set to a predetermined frequency higher than the frequency for use when neither the phase difference nor the driving signal voltage is changed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.