CRYSTAL RESONATOR
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United States of America Patent
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Sep 7, 2017
app pub date -
Mar 2, 2017
filing date -
Mar 4, 2016
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Abstract
A crystal resonator includes a flat plate-shaped crystal element and excitation electrodes. The crystal element has principal surfaces parallel to an X′-axis and a Z′-axis. The X′-axis is an axis of rotating an X-axis as a crystallographic axis of a crystal in a range of 15 degrees to 25 degrees around a Z-axis as a crystallographic axis of the crystal. The Z′-axis is an axis of rotating the Z-axis in a range of 33 degrees to 35 degrees around the X′-axis. The excitation electrodes are formed on the respective principal surfaces of the crystal element. The excitation electrodes are each formed into an elliptical shape. The elliptical shape has a long axis extending in a direction in a range of −5 degrees to +15 degrees with respect to a direction that the X′-axis extends.
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