Patent ID: 6144141
Filing Date: 2000-11-07
Classification: H03H

Abstract:
A piezoelectric resonator comprising:a piezoelectric base member including a plurality of piezoelectric layers and a plurality of electrodes;means for driving said piezoelectric base member; anda support substrate supporting said piezoelectric base member; whereinat least two of said piezoelectric layers are stacked on each other and at least one of said plurality of electrodes is disposed between said at least two of said piezoelectric layers and said at least two of said piezoelectric layers are polarized in opposite directions such that a longitudinal basic vibration is generated in said base member along a longitudinal axis of the piezoelectric base member and said piezoelectric base member is displaced along the longitudinal axis when said means for driving said piezoelectric base member applies an electric field to said at least one of said plurality of electrodes and such that a single vibration node at which point substantially no vibration occurs is defined at an approximate center of the piezoelectric base member and said piezoelectric base member is supported on said support substrate only at a location of said single vibration node located at the approximate center of the piezoelectric base member.