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US 2013/0257554 A1Published application
Resonator element, resonator, electronic device, electronic apparatus, and mobile object
AssigneeSeiko Epson Corporation
InventorsOsamu ISHII, Takao MORITA
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Abstract
A resonator element includes a substrate vibrating in a thickness-shear vibration mode, a first excitation electrode disposed on one principal surface of the substrate, and has a shape obtained by cutting out four corners of a quadrangle, and a second excitation electrode disposed on the other principal surface of the substrate, and a ratio (S2/S1) between the area S1 of the quadrangle and the area S2 of the first excitation electrode fulfills 87.7%≦(S2/S1)<95.0%.
Claims20
A resonator element comprising:
- a substrate including a first principal surface and a second principal surface respectively forming an obverse surface and a reverse surface of the substrate, and vibrating in a thickness-shear vibration mode;
- a first excitation electrode disposed on the first principal surface, and including a side or a circumference having an internal contact with an imaginary quadrangle;
- and
- a second excitation electrode disposed on the second principal surface,
- wherein assuming that an area of the quadrangle is S1, and an area of the first excitation electrode is S2,
- the following relationship is fulfilled:
- 87.7%≦(S2/S1)<95.0%.
4 more elements
Dependencies are inferred from the claim text.