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
Orthogonal tunable antenna array for wireless communication devices
Integrated projector system
Metal colloidal particles, metal colloid and use of metal colloid
Stacked structure and stacked method for three-dimensional chip
Anti-GITR antibodies
Continuously variable transmission and control method thereof
Profiling activity through video surveillance
  Randomly Featured Patents
Pig
Method of obtaining nicotinic acid
Zinc electroplating additive concentrate
Pneumatic pressure automatic braking mechanism
LED chip
Control handle
Compositions, kits and methods for administration of antilipemic drugs
Method for providing a redistribution metal layer in an integrated circuit
Lighting device
Method for forming integrated circuits having buried doped regions