Piezoelectric vibrating piece and piezoelectric device
A piezoelectric vibrating piece includes a first extraction electrode and a second extraction electrode. The first extraction electrode is extracted from an excitation electrode formed on one principal surface to a framing portion via one principal surface of a connecting portion. The second extraction electrode is extracted from the extraction electrode formed on another principal surface to the framing portion via another principal surface of the connecting portion, a side surface of the connecting portion, and the one principal surface of the connecting portion. A distance between a first side and a second side at the framing portion is larger than a distance between the first side and the second side at the connecting portion. The first side is a side of the first extraction electrode at the second extraction electrode side. The second side is a side of the second extraction electrode at the first extraction electrode side.
1. A piezoelectric vibrating piece, comprising:
a vibrator, having a rectangular shape with a short side and a long side, the vibrator including excitation electrodes at both respective principal surfaces, the vibrator vibrating at a predetermined vibration frequency;
a framing portion, surrounding a circumference of the vibrator;
one connecting portion, connecting the vibrator and the framing portion;
a first extraction electrode, being extracted from the excitation electrode formed on one principal surface to the framing portion via one principal surface of the connecting portion; and
a second extraction electrode, being extracted from the extraction electrode formed on another principal surface to the framing portion via another principal surface of the connecting portion, a side surface of the connecting portion, and the one principal surface of the connecting portion, wherein
a distance between a first side and a second side at the framing portion is larger than a distance between the first side and the second side at the connecting portion,
the first side is a side of the first extraction electrode at the second extraction electrode side, the first side being from the connecting portion to the framing portion on the one principal surface, and
the second side is a side of the second extraction electrode at the first extraction electrode side, the second side being from the connecting portion to the framing portion on the one principal surface.
2. The piezoelectric vibrating piece according to claim 1 , wherein
the connecting portion connects a center part of the short side of the vibrator.
3. The piezoelectric vibrating piece according to claim 1 , wherein
the first extraction electrode has a width at the connecting portion on the one principal surface, the width being narrower than a width of the second extraction electrode at the connecting portion on the one principal surface.
4. The piezoelectric vibrating piece according to claim 1 , wherein
one side of the first side and the second side extends in a direction of the long side, and
another side is formed into a straight line from the connecting portion to the framing portion separated from the one side.
5. The piezoelectric vibrating piece according to claim 1 , wherein
at least an end of the first side and an end of the second side is formed into a fan shape at the framing portion.
6. The piezoelectric vibrating piece according to claim 1 , wherein
at least one of the first side and the second side at the framing portion is formed in a staircase pattern.
7. The piezoelectric vibrating piece according to claim 1 , wherein
the first extraction electrode is extracted from the connecting portion to the framing portion, the first extraction electrode being extracted to the framing portion at an opposite side with respect to the vibrator.
8. A piezoelectric device, comprising:
the piezoelectric vibrating piece according to claim 1 ;
a base plate, being bonded on the one principal surface of the framing portion; and
a lid plate, being bonded on the other principal surface of the framing portion to seal the vibrator.