Patent ID: 7446455
Filing Date: 2008-11-04
Classification: H03H

Abstract:
1. A thin film elastic wave resonator which vibrates at a predetermined frequency, comprising: a piezoelectric body; a first electrode section formed on one surface of the piezoelectric body; a second electrode section which is formed so as to surround a periphery of the first electrode section, being positioned so as to be insulated from the first electrode section on said one surface of the piezoelectric body; a third electrode section which is formed so as to surround a periphery of the first electrode section, being positioned so as to be insulated from the first electrode section and the second electrode section on said one surface of the piezoelectric body; a fourth electrode section formed on another surface of the piezoelectric body, which faces said one surface of the piezoelectric body; a fifth electrode section which is formed so as to surround a periphery of the fourth electrode section, being positioned so as to be insulated from the fourth electrode section on said another surface of the piezoelectric body; a sixth electrode section which is formed so as to surround a periphery of the fourth electrode section, being positioned so as to be insulated from the fourth electrode section and the fifth electrode section on said another surface of the piezoelectric body; and a supporting section, for supporting a structure formed by the piezoelectric body and the first to sixth electrode sections, which includes at least a substrate, wherein the first electrode section is surrounded by the second electrode section and the third electrode section, the fourth electrode section is surrounded by the fifth electrode section and the sixth electrode section, the first electrode section and the fourth electrode section are disposed so as to sandwich the piezoelectric body and face each other, the second electrode section and the fifth electrode section are disposed so as to sandwich the piezoelectric body and face each other, the third electrode section and the sixth electrode section are disposed so as to sandwich the piezoelectric body and face each other, and an electrical signal is inputted to one of the first electrode section and the fourth electrode section, and an electrical signal is outputted from either the second electrode section and the sixth electrode section or the third electrode section and the fifth electrode section; or an electrical signal is inputted to either the second electrode section and the sixth electrode section or the third electrode section and the fifth electrode section, and an electrical signal is outputted from one of the first electrode section and the fourth electrode section.