| CPC H03H 9/19 (2013.01) [H03H 9/1035 (2013.01); H03H 9/132 (2013.01)] | 14 Claims |
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1. A piezoelectric resonator plate that operates in a thickness shear vibration mode, comprising:
a vibrating part;
an external frame part surrounding an outer periphery of the vibrating part;
a support part connecting the vibrating part to the external frame part;
a cutout part formed between the vibrating part and the external frame part by cutting out the piezoelectric resonator plate;
a first excitation electrode formed on a first main surface of the vibrating part;
a second excitation electrode formed on a second main surface of the vibrating part, the second excitation electrode making a pair with the first excitation electrode;
a first lead-out wiring formed on the first main surface of the vibrating part and drawn from the first excitation electrode through the support part to the external frame part; and
a second lead-out wiring formed on the second main surface and drawn from the first excitation electrode through the support part to the external frame part, wherein
one excitation electrode of the first excitation electrode and the second excitation electrode includes at least one protruding part, other than the first and second lead-out wirings, that protrudes with respect to the other excitation electrode of the first excitation electrode and the second excitation electrode within the vibrating part in plan view,
the other excitation electrode includes at least one pair of parallel sides parallel to each other,
the at least one protruding part protrudes outward from a part between the pair of parallel sides within the vibrating part in plan view, and furthermore has an outer edge shape that is not along the pair of parallel sides within the vibrating part in plan view,
the vibrating part is configured such that no mechanical connection point and no electrical connection point are directly formed thereon,
the first lead-out wiring extends from a corner part of the first excitation electrode, and a connection part of the first lead-out wiring and the first excitation electrode is not superimposed on the second lead-out wiring and the second excitation electrode in plan view, and
the second lead-out wiring extends from a corner part of the second excitation electrode, and a connection part of the second lead-out wiring and the second excitation electrode is not superimposed on the first lead-out wiring and the first excitation electrode in plan view.
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