Patent ID: 9712138
Date: 2017-07-18
CPC Classifications: H03H

Claim:
1. A resonator element comprising: a quartz crystal substrate in which an X axis of an orthogonal coordinate system having the X axis serving as an electric axis, a Y axis serving as a mechanical axis, and a Z axis serving as an optical axis, which are crystallographic axes of quartz crystal, is set as a rotation axis, an axis inclined from the Z axis so that a +Z side is rotated in a −Y direction of the Y axis is set as a Z′ axis, an axis inclined from the Y axis so that a +Y side is rotated in a +Z direction of the Z axis is set as a Y′ axis, a plane including the X and Z′ axes is set as a main plane, and the direction oriented along the Y′ axis is set as a thickness direction, wherein the quartz crystal substrate includes wherein in a plan view, the second portion includes an outer frame in two edges present in opposite regions to regions facing the first portion, and a contour of the outer frame is bent more gently than a contour of an edge of the first portion, and wherein when R is a length of the outer frame along the X axis, λ is a wavelength of flexural vibration of the quartz crystal substrate, and R/(λ/2)=k, a relation of “0.1<k<1.4” is satisfied.