Patent ID: 8013495
Filing Date: 2011-09-06
Classification: H01L,H02N

Abstract:
1. A stator comprising: an elastic body including a flat portion longitudinally disposed at an outer surface thereof, and a central hole penetrating a central portion of the elastic body and having a predetermined size; and a piezoelectric body integrally mounted on the flat portion and providing an external force for deforming the elastic body by generating a vibration mode in an x-direction and a vibration mode in a y-direction at the same time when an AC voltage is applied thereto, the piezoelectric body including a first internal piezoelectric body and a second internal piezoelectric body that are integrally disposed parallel to each other in a longitudinal direction of the flat portion, wherein the piezoelectric body is a multilayer ceramic structure in which first and second ceramic sheets are alternately stacked parallel to the flat portion, the first internal piezoelectric body includes a first internal electrode provided on the first ceramic sheet by pattern printing and electrically connected to a first external electrode provided on an outer surface of the piezoelectric body, and the second internal piezoelectric body includes a second internal electrode provided parallel to the first internal electrode on the first ceramic sheet by pattern printing and electrically connected to a second external electrode provided on the outer surface of the piezoelectric body, wherein the first internal piezoelectric body and the second internal piezoelectric body are polarized in a direction of a width of the piezoelectric body, and an internal ground electrode is provided on the second ceramic sheet by pattern printing and is electrically connected to an external ground electrode provided on the outer surface of the piezoelectric body.