Patent ID: 7834526

Claim:
A contour resonator at least including a first vibrating substrate and a second vibrating substrate, the first vibrating substrate and the second vibrating substrate having main surfaces facing each other, the main surfaces being bonded, the contour resonator comprising: a first excitation electrode provided on a front main surface of the first vibrating substrate; a second excitation electrode provided on a back main surface of the second vibrating substrate; and a common intermediate excitation electrode provided at an interface between the first vibrating substrate and the second vibrating substrate, wherein: the first excitation electrode and the second excitation electrode are electrically connected to constitute a first terminal; the intermediate excitation electrode constitutes a second terminal; and the first vibrating substrate and the second vibrating substrate perform a contour vibration in accordance with an excitation signal applied between the first terminal and the second terminal, wherein a resonance frequency Fb of a single body of at least one vibrating substrate of the first vibrating substrate or the second vibrating substrate and a resonance frequency Fe of a single body of at least one excitation electrode of the first excitation electrode, the second excitation electrode or the intermediate excitation electrode satisfy a relationship of 0.995×Fe≦Fb≦1.005×Fe; the contour resonator is a Lame-mode resonator or a pseudo-Lame mode resonator: the first vibrating substrate and the second vibrating substrate are each made of a crystal having crystal anisotropy; and the first vibrating substrate and the second vibrating substrate are identical to each other in cut angle of the crystal and different from each other in in-plane rotation angle by 90°, or the first vibrating substrate and the second vibrating substrate are different from each other in a cut angle from the crystal by 180° and identical to each other or different from each other in in-plane rotation angle by 180°.