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US 2015/0091665 A1Published application
Resonator element, resonator, electronic device, electronic apparatus, and moving object
AssigneeSeiko Epson Corporation
InventorYusuke YAMAMOTO
Life of this patent
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Abstract
A resonator element includes a substrate that vibrates in a thickness shear vibration, a first excitation electrode that is provided on one main surface of the substrate and has a shape in which at least three corners of a virtual quadrangle are cut out, and a second excitation electrode that is provided on the other main surface of the substrate, and a ratio (S2/S1) of an area S1 of the virtual quadrangle and an area S2 of the first excitation electrode satisfies a relationship of 69.2%≦(S2/S1)≦80.1%.
Claims12
A resonator element comprising:
- a substrate that vibrates in a thickness shear vibration and includes a first main surface and a second main surface which are in a front and back relationship to each other;
- a first excitation electrode that is provided on the first main surface;
- and
- a second excitation electrode that is provided on the second main surface, and overlaps the first excitation electrode in a plan view,
- wherein a region of the substrate which is interposed between the first excitation electrode and the second excitation electrode includes a side or a circumference being in contact with a virtual quadrangle having four corners which are all the same size in a plan view,
- wherein the region includes an outer edge that does not overlap at least three corners of the quadrangle, in a plan view, and
- wherein when an area of the quadrangle is set to S1, and
- an area of the first excitation electrode is set to S2,
- a relationship of 69.2%≦(S2/S1)≦80.1% is satisfied.
6 more elements
Dependencies are inferred from the claim text.