Patent ID: 6672160
Filing Date: 2004-01-06
Classification: G01P

Abstract:
An acceleration sensor comprising:a bimorph acceleration detection element including; a first resonator; a second resonator; an intermediate layer; and an acceleration detection circuit; wherein said first resonator and said second resonator are bonded with said intermediate layer interposed therebetween; said first and said second resonators include a piezoelectric body and electrodes arranged on both main surfaces thereof; said intermediate layer transfers flexural stress from one of said first and said second resonators to the other of said first and said second resonators and attenuates vibrations transmitted from one of said first and said second resonators to the other of said first and said second resonators; said acceleration detection element is supported such that said first and second resonators are deflected in the same direction according to the application of acceleration; and the acceleration detection circuits detects a difference between frequency changes of said first resonator and said second resonator or a difference between impedance changes of said first resonator and said second resonator which is caused by deflection of said acceleration detection element.