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
Query optimization with awareness of limited resource usage
Distributive data capture
Method and system of extending battery life of a wireless microphone unit
Touch screen tablet
Negative active material for a rechargeable lithium battery, a method of preparing the same, and a rechargeable lithium battery comprising the same
Systems and methods for DC-to-DC converter control
  Randomly Featured Patents
Axially cammed housing for low insertion force connector
Substrate layer cutting device and method
Controllable heating means for small masses, particularly the expansion medium in heat setting apparatuses
Print job handling menu selection apparatus and method
Disk drive carrier
Packaged device with acoustic resonator and electronic circuitry and method of making the same
Pyrimine-producing bacteria
Fuel transaction system for enabling the purchase of fuel and non-fuel items on a single authorization
Method of and apparatus for the positional detection of objects
Method for testing fatigue of a lead