Patent ID: 9577574
Date: 2017-02-21
CPC Classifications: H01L,H03B,H03H

Claim:
1. A resonator comprising: a resonator element including a quartz crystal substrate that includes a first area performing a thickness-shear vibration and a second area with a thickness thinner than the first area and located around the first area; and a base substrate to which the second area of the resonator element on one edge side thereof is attached via a bonding material, wherein in an orthogonal coordinate system composed of an X-axis as an electrical axis, a Y-axis as a mechanical axis, and a Z-axis as an optic axis that are crystal axes of quartz crystal, the quartz crystal substrate has a Z′-axis that is an axis obtained by inclining the Z-axis such that a +Z-side thereof rotates about the X-axis toward a −Y-direction of the Y-axis, a Y′-axis that is an axis obtained by inclining the Y-axis such that a +Y-side thereof rotates about the X-axis toward a +Z-direction of the Z-axis, a major surface that is a surface including the X-axis and the Z′-axis, and a thickness in a direction along the Y′-axis, the resonator element includes an electrode pad located in one end of the second area of the resonator element, in a plan view, the area where the bonding material is bonded overlaps with the electrode pad and also with a portion of the end of the second area which does not include the electrode pad, the resonator satisfies the relation: where Xp is the maximum length of an area of the second area where the bonding material is bonded along the X-axis in a plan view and λ is the wavelength of a flexural vibration occurring in the quartz crystal substrate, and the resonator satisfies the relation: where Lx is the minimum length along the X-axis between an edge of the area of the second area where the bonding material is bonded on the first area side and an edge of the first area on the bonding material side in the plan view.