Patent ID: 7538477
Filing Date: 2009-05-26
Classification: B06B,B81B,G01H,H04R

Abstract:
1. A transducer structure, comprising: a first transducer, which comprises: a first inner electrode; a first outer electrode, which is substantially concentric with the first inner electrode; a lower inner electrode; a lower outer electrode, which is substantially concentric with the lower inner electrode; a first piezoelectric element disposed between the first electrodes and the lower electrodes; a first gap between the first inner electrode and the first outer electrode; and a lower gap between the lower inner electrode and the lower outer electrode; and a second transducer disposed over the first transducer, the second transducer comprising: a second inner electrode; a second outer electrode, which is substantially concentric with the second inner electrode; the lower inner electrode; the lower outer electrode; a second piezoelectric element disposed between the second electrodes and the lower electrodes; and a second gap between the second inner electrode and the second outer electrode.