Drive apparatus of piezoelectric actuator, electronic apparatus, drive method of electronic apparatus, drive control program of electronic apparatus, and medium
US7675218B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 10, 2005 |
| Grant date | Mar 9, 2010 |
| Priority date | — |
| Expiry date | Jul 5, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10N30/202
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electronic device comprising a power source, a piezoelectric actuator A, and a drive control apparatus 100 for controlling the driving of the piezoelectric actuator, wherein the drive control apparatus 100 is provided with a drive circuit 111 for supplying a drive signal SDR to the piezoelectric element of the vibrating body 12, a phase difference detection means 120 for detecting the phase difference indicating the vibration state of the vibrating body 12, a comparison voltage setting circuit 133 for correcting the target phase difference to be the target for the vibration state, and a drive frequency setting means 140 for comparing the phase difference with the target phase difference; and the piezoelectric actuator A can be driven with high efficiency independent of the drive voltage by modifying the drive frequency of the drive signal SDR so that the phase difference approaches the target phase difference based on the results of the above comparison.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.