Patent ID: 7501743

Claim:
A piezoelectric ultrasonic motor having 2-dimensional positioning movement, the motor comprising: a stator, wherein said stator includes a piezoelectric ceramic bar and an electrode disposed on the bar, and the bar includes two wings that are separated by a predetermined angle to form a predetermined shape, wherein a free end of each wing forms a tip and a groove is located at a junction between each wing to increase a total displacement of the tip of each wing; a power input, wherein said power input applies a voltage to the stator to excite a vibration in the each of the wings, and the combined motion of each wing produces a 2 degrees of freedom elliptical motion at the tip of each wing; and a load operatively connected to the stator, wherein a portion of the load in contact with the stator is driven in an x, z or diagonal direction to move the load linearly in 2-dimensional space through a frictional force between the load and the stator, due to the elliptical motion at the tip of each wing.