Patent ID: 6388363
Filing Date: 2002-05-14
Classification: H03H

Abstract:
A piezoelectric resonator comprising:a substantially rectangular piezoelectric substrate having first and second main surfaces; first and second excitation electrodes partially provided on said first and second main surfaces, respectively, of said piezoelectric substrate, said first and second excitation electrodes being opposed to each other in a central longitudinal portion of the piezoelectric substrate with the piezoelectric substrate being located therebetween; first and second lead-out electrodes electrically connected to said first and second excitation electrodes, respectively, said first and second lead-out electrodes being provided on the first and second main surface of said piezoelectric substrate, respectively; and first and second terminal electrodes arranged to achieve external connections, said first and second terminal electrodes being provided at end portions of said first and second lead-out electrodes, respectively, said end portions being opposed to an end portion where said respective first and second excitation electrodes are connected; wherein at least one of said first and second terminal electrodes includes an electrode extension portion arranged to extend in a longitudinal direction of said piezoelectric substrate into the central longitudinal portion of said piezoelectric substrate where said first and second excitation electrodes are located; and a mean normal-line distance from the outer peripheral edge of said excitation electrode to the inside edge of said electrode extension portion is at least about 1.2d, where d is the diameter of said excitation electrode.