Resonator element, resonator, resonator device, oscillator, electronic apparatus, and moving object
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United States of America Patent
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Jul 18, 2017
Grant Date -
Aug 4, 2016
app pub date -
Jan 25, 2016
filing date -
Jan 29, 2015
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Abstract
A resonator element includes a quartz crystal substrate in which a plane including X and Z′ axes is set as a main plane and a direction oriented along a Y′ axis is a thickness direction. The quartz crystal substrate includes a first region in which thickness shear vibration is generated, a second region that has a thickness thinner than the first region, and first protrusions that are disposed between one pair of electrode pads disposed to be lined in a direction oriented along a Z′ axis on a mounted side of the second region. When Lx is a length of the first protrusions along the X axis and λ is a wavelength of flexural vibration of the quartz crystal substrate, a relation of “λ/2×(2n+1)−0.1λ≦Lx≦λ/2×(2n+1)+0.1λ” (where n is a positive integer) is satisfied.
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