Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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
Tag-based apparatus and methods for neural networks
Remote device pairing setup
Bipolar transistor with diffused layer between deep trench sidewall and collector diffused layer
Method and apparatus for a battery docking connector having reserve power for hot battery swap
Adaptive contact window wherein the probability that an answering user/expert will respond to a question corresponds to the answering users having response rates that are based on the time of
Electronic system auto-mute control circuit and control method thereof
Multi-layer, microporous polyolefin membrane, its production method, battery separator and battery
  Randomly Featured Patents
Lightweight concrete compositions containing antimicrobial agents
Glucose 6-oxidases
Interactive transactions processor using sequence table pointers to access function table statements controlling execution of specific interactive functions
Valve and method for the production of a valve
Photosensitive logo on a closure flap for a golf glove
Brush with cleaning attachment
Display assembly
Combined cape and cover for visor or the like
Vehicle exterior mirror assembly with blind spot indicator
Method and device for electronic communication between at least two communication devices