Patent ID: 7667558

Claim:
A thin film elastic wave resonator which vibrates at a predetermined frequency, comprising: a piezoelectric body; a first electrode section formed on the one surface of the piezoelectric body; a second electrode section formed on the one surface of the piezoelectric body and positioned to encompass the first electrode section and be insulated from the first electrode section; a third electrode section formed on another surface of the piezoelectric body, the another surface of the piezoelectric body facing the one surface of the piezoelectric body; a fourth electrode section formed on the another surface of the piezoelectric body and positioned to encompass the third electrode section and be insulated from the third electrode section; and a supporting section, for supporting a structure formed by the piezoelectric body and the first, second, third and fourth electrode sections, which includes a substrate, wherein an electrical signal is inputted to the first electrode section and the third electrode section and an electrical signal is outputted from the second electrode section and the fourth electrode section, or an electrical signal is inputted to the second electrode section and the fourth electrode section and an electrical signal is outputted from the first electrode section and the third electrode section, and wherein a clearance between the first electrode section and the second electrode section is equal to or greater than a thickness of the piezoelectric body.