Patent ID: 6987346
Filing Date: 2006-01-17
Classification: H03H

Abstract:
1. An energy trap piezoelectric resonator component utilizing third overtone of a thickness longitudinal vibration, comprising: a piezoelectric substrate having first and second major surfaces and polarized in a direction of thickness between the first and second major surfaces; a first vibrating electrode disposed on a portion of the first major surface of the piezoelectric substrate; and a second vibrating electrode disposed on a portion of the second major surface of the piezoelectric substrate and facing the first vibrating electrode with the piezoelectric substrate interposed therebetween; wherein each of the first and second vibrating electrodes has a substantially elliptical shape, and wherein a flattening ratio a/b is within a range of about 1.2 to about 1.45, where a represents the major axis diameter of the substantially elliptical shape and b represents the minor axis diameter of the substantially elliptical shape; and first and second casing substrates respectively laminated on top and bottom surfaces of the piezoelectric substrate, wherein vibrating cavities are provided between the first vibrating electrode and the first casing substrate and between the second vibrating electrode and the second casing substrate.