Patent ID: 6133673
Filing Date: 2000-10-17
Classification: H03H

Abstract:
An energy trap type piezoelectric resonator including:an energy trap type piezoelectric resonator element arranged to vibrate in a third harmonic of a longitudinal vibration in a thickness direction of the resonator, the energy trap type piezoelectric resonator element including a piezoelectric substrate, first and second vibrating electrodes respectively provided on main surfaces of the piezoelectric substrate so as to face each other with the piezoelectric substrate disposed therebetween, a portion where the first and second vibrating electrodes face each other defining a vibrating portion;first and second sealing substrates joined and connected to both main surfaces of the piezoelectric resonator element so as to sandwich the piezoelectric resonator element therebetween and so as to define sealed spaces around the first and second vibrating electrodes for allowing free vibration of the vibrating portion in the sealed spaces;sealing portions in which the first and second substrates are joined and connected to the piezoelectric resonator element around the sealed spaces; andthe sealed spaces being constructed so as to satisfy 0<d/t<5 where a thickness of the piezoelectric substrate is represented by t and a shortest distance to the sealing portion from an external edge of the first and second vibrating electrodes is d.