Resources Contact Us Home
Piezoelectric actuator device for ultrasonic motor

Image Number 8 for United States Patent #7564173.

An ultrasonic motor piezoelectric actuator element uses a primary longitudinal mode and a secondary bending mode and includes a stacked piezoelectric element in which piezoelectric layers and electrode layers are stacked alternately in such a manner that the electrode layers divide the piezoelectric layers into two approximately equal portions. A piezoelectric inactive region is formed from the surface portion to the center portion in the thickness direction of the stacked piezoelectric element. The migration resistance of the piezoelectric actuator element is improved while suppressing a decrease in displacement so that a short circuit can be prevented and portions generating heat during alternating polarization can be dispersed, whereby reliability is increased. Moreover, the amount of electrode material used can be reduced, whereby cost can be reduced.

  Recently Added Patents
Display screen or portion thereof with graphical user interface
Silicone hydrogel, lens for eye and contact lens
Multi-protocol data transfers
Gas cap removal tool
Ventilated vacuum communication structure
System and method for supporting fibre channel over ethernet communication
Lightweight multicast method and apparatus for data distribution service
  Randomly Featured Patents
Indirect variable valve actuation for an internal combustion engine
Derivatives of thiazolidinecarboxylic acids and related acids
Method and apparatus for downhole spectroscopy
Magnetic recording medium having linear or curved tracking servo patterns formed obliquely relative to direction of tracks, and magnetic recording apparatus using the same
Lifting device
Layout judgment apparatus and layout judgment system
Ink jet recording apparatus and ink jet recording method
Phase shift mask blank and phase shift mask
Optical disc storage apparatus
Display device with a plurality of picture elements and electronic device with display device