CRYSTAL RESONATOR, CRYSTAL RESONATOR PACKAGE, AND OSCILLATOR

摘要

A crystal resonator includes a plate-shaped crystal element, excitation electrodes, and a second crystal region. The plate-shaped crystal element is supported to a supporting portion. The crystal element is configured to vibrate at a thickness shear vibration. The excitation electrodes are disposed at both surfaces of a first crystal region of the crystal element. The second crystal region is positioned outside with respect to the excitation electrodes. The second crystal region is formed at a peripheral edge portion of the crystal element so as to occupy a region of equal to or more than 75% of a whole circumference of the crystal element. The second crystal region has a positive/negative direction of an X-axis of a crystal different from a positive/negative direction of an X-axis of a crystal of the first crystal region.

主权项

1. A crystal resonator, comprising:
a plate-shaped crystal element supported to a supporting portion, the crystal element being configured to vibrate at a thickness shear vibration; excitation electrodes disposed at both surfaces of a first crystal region of the crystal element; and a second crystal region formed at a peripheral edge portion of the crystal element in the outside of the excitation electrodes so as to occupy a region of equal to or more than 75% of a whole circumference of the crystal element, a positive/negative direction of an X-axis of a crystal in the second crystal region being reverse to a positive/negative direction of an X-axis of a crystal in the first crystal region.