Patent ID: 7498904
Filing Date: 2009-03-03
Classification: H03H

Abstract:
1. A piezoelectric thin film resonator comprising: a substrate in which a cavity is formed; a first electrode having a first electrode edge and partly spanning the cavity in the substrate; a piezoelectric layer placed on the first electrode; a second electrode having a second electrode edge and placed on the piezoelectric layer; a resonator unit constituted by overlapping the first electrode, the piezoelectric layer, the second electrode, and the cavity; a second lead wiring which is integral with the second electrode, extends to the substrate where the cavity is not present, and has a width larger than a part of a peripheral length of the cavity to which the second electrode edge extends; and wherein a first length defined by the periphery of the first electrode edge of the resonator unit is larger than a second length defined by the second electrode edge of the resonator unit.