| 摘要 |
A quartz resonator blank vibrating at a predetermined resonance frequency with driving power applied to at least a principal surface, wherein, defining the electrical axis, the mechanical axis, and the optical axis of quartz as X-axis, Y-axis, and Z-axis, respectively, the principal surface includes a side parallel to an X'-axis defined by rotating the X-axis clockwise around the Z-axis as an angle phi no smaller than 7 degrees and no greater than 17.3 degrees, and a side parallel to a Z'-axis defined by rotating the Z-axis clockwise around the X'-axis as an angle theta no smaller than 34.3 degrees and no greater than 35.25 degrees.
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