| 摘要 |
Provided is a novel AT cut quartz piece in which unnecessary vibration other than vibration originating from an AT cut quartz vibrator can be suppressed, and the impedance of the vibrator improved, in comparison with the prior art. The two side surfaces that intersect with the Z' quartz crystal axis are configured with three surfaces: a first surface 11a, which is the m surface of the quartz crystal; a second surface 11b, which meets with the first surface but is not the m surface; and a third surface, which meets with the second surface 11b, but is not the m surface. Also, the second surface 11b corresponds to a surface in which the main surface 11d of the AT cut quartz piece is rotated –74±3° about the X-axis of the quartz crystal as a rotation axis, and the third surface 11bc corresponds to a surface in which the main surface 11d is rotated –56±3° about the X-axis of the quartz crystal as a rotation axis. |
