Patent ID: 6054797
Filing Date: 2000-04-25
Classification: H03H

Abstract:
An energy-trapping piezoelectric resonator vibrating in a third-order wave of a thickness-extension vibration mode, comprising:a piezoelectric substrate polarized in a direction of thickness thereof, a ratio W/T of a width W to a thickness T of said piezoelectric substrate being approximately one of 0.88.+-.5%, 1.06.+-.4%, 1.32.+-.5%, 1.80.+-.3%, 2.30.+-.3% 2.69.+-.3% 3.16.+-.2%,or 3.64.+-.2%, the piezoelectric resonator being adapted to generate the third order wave of the thickness-extension vibration mode as a main vibration of the resonator while suppressing spurious vibrations caused by a lateral mode vibration; andfirst and second electrodes respectively disposed on top and bottom surfaces of said piezoelectric substrate to cover substantially the entire width of said piezoelectric substrate and opposedly facing each other at a central portion of said piezoelectric substrate in a longitudinal direction thereof.