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
Integrated circuit packaging system with interconnects and method of manufacture thereof
Differentiated PSIP table update interval technology
Tuning peg for a stringed instrument
Systems of an electronic device and methods for manufacturing the same
Method and system for delivering and executing virtual container on logical partition of target computing device
Fluid handling structure, a lithographic apparatus and a device manufacturing method
Identification of websites that break out of frames
  Randomly Featured Patents
Method of error correction for a series of marks on an optical disc
Mobile e-mail document transaction service
Video and digital multimedia aggregator
Oligonucleotides as temperature-sensitive inhibitors for DNA polymerases
Method and apparatus for evaluating data associated with an offshore energy platform
Method of manufacturing I/O terminals on I/O pads
III-nitride light-emitting devices with one or more resonance reflectors and reflective engineered growth templates for such devices, and methods
System and method for auto-bias of an amplifier
Flaps closer apparatus
Rear projector and producing method thereof