Patent ID: 6107727
Filing Date: 2000-08-22
Classification: H03H

Abstract:
A thickness extensional vibration mode piezoelectric resonator utilizing an nth-order harmonic of a thickness extensional vibrational mode, said piezoelectric resonator comprising:a piezoelectric plate having first and second surfaces arranged opposite to each other;a first excitation electrode disposed on said first surface of said piezoelectric plate;a second excitation electrode disposed on said second surface, the first and second excitation electrodes being opposed to each other with said piezoelectric plate located therebetween;at least one internal electrode disposed in said piezoelectric plate and located at least partially opposite to the first and second excitation electrodes, an opposing portion of said first and second excitation electrodes, said internal electrode and said piezoelectric plate defining a resonating portion; whereina ratio W/d is less than about 6.1 in which d=t/n, where W is a width of said piezoelectric plate and t is a thickness of said piezoelectric plate and n is an integral larger than 1, and wherein said piezoelectric plate has an elongated strip shape.