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
Signal generator
Low power voltage controlled oscillator (VCO)
Image processing device, image processing method, and program
Output device, source apparatus, television set, system, output method, program, and recording medium
Method and apparatus for sensing an input object relative to a sensing region of an ultrasound sensor device
Domain isolation through virtual network machines
Handheld electronic device with text disambiguation employing advanced editing feature
  Randomly Featured Patents
Bloodless intravenous integrated catheter
High stability and high capacity precursor vapor generation for thin film deposition
Fuel-air control device
Artificial baby feeding
Method of repairing a spent electrode for plasma arc torch
Form burster
Profiled substrate heating utilizing a support temperature and a substrate temperature
Communication unit having non-destructive arbitration function
Method for filtering particles out of a beam of radiation and filter for a lithographic apparatus
Playing board for a board game