Patent ID: 6717335
Filing Date: 2004-04-06
Classification: H03H

Abstract:
A composite vibration device comprising:a vibrating member defining a vibration producing source, the vibrating member being comprised of a material having a first acoustical impedance Z1; first and second reflecting layers connected to respective sides of the vibrating member, each of the first and second reflecting layers being comprised of a material having a second acoustical impedance Z2 which is lower than the first acoustical impedance Z1; and first and second supporting members, each of which is comprised of a material having a third acoustical impedance Z3 which is higher than the second acoustical impedance Z2, the first and second supporting members being connected to sides of the first and second reflecting layers opposing the sides of the reflecting layers connected to the vibrating member, respectively; wherein vibrations propagated from the vibrating member to the reflecting layers are reflected at the interfaces between the reflecting layers and the supporting members.