Patent ID: 6051910
Filing Date: 2000-04-18
Classification: H03H

Abstract:
A thickness extensional vibration mode piezoelectric resonator, said piezoelectric resonator comprising:a substantially rectangular piezoelectric plate having first and second external surfaces opposite to each other;a first excitation electrode located on said first external surface of said piezoelectric plate;a second excitation electrode located on said second external surface of said piezoelectric plate and arranged to be opposed to said first excitation electrode with said piezoelectric plate located therebetween;at least one internal electrode disposed in said piezoelectric plate and arranged at least partially opposed to the first and second excitation electrodes and so as to extend to both sides of the piezoelectric plate;a resonating portion defined by opposed portions of said first and second excitation electrodes, said internal electrode, and said piezoelectric plate;a plurality of vibration-attenuating portions disposed on both sides of said resonating portion along only one direction; andsaid first and second excitation electrodes extending substantially to both sides of the piezoelectric plate in a direction substantially perpendicular to said one direction.