Driving apparatus
US7408288B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 7, 2005 |
| Grant date | Aug 5, 2008 |
| Priority date | — |
| Expiry date | Oct 7, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02N2/025
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A determination is made whether a moving speed of a slider section with respect to a rod section in a piezoelectric actuator is lower than a predetermined speed. When the moving speed is lower than the predetermined speed, it is considered that a friction-bonded portion between the rod section and the slider section is in a fastened state or a nearly fastened state. A resonance frequency of the piezoelectric actuator or a frequency proximity to the resonance frequency is set as a driving frequency for the piezoelectric actuator. The slider section is moved in a reciprocating manner plural times with respect to the rod section. As a result, an abnormal state is eliminated from the piezoelectric actuator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.