Piezoelectric resonator adapted to generate a harmonic wave in a

Details Piezoelectric resonator adapted to generate a harmonic wave in a Piezoelectric resonator adapted to generate a harmonic wave in a

1998-12-16

2000-03-21

Dougherty, Thomas M.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310366, H03H 915

Patent

active

060406526

ABSTRACT:
A piezoelectric resonator adapted to generate a harmonic wave in a thickness extensional vibration mode includes a piezoelectric member, a plurality of excitation electrodes disposed on or within the piezoelectric member and superposed on one another in the thickness direction of the piezoelectric member with piezoelectric layers of the piezoelectric member interposed therebetween, lead-out electrodes respectively connected to the excitation electrodes and extending to side surfaces of the piezoelectric member at the same vertical positions as the excitation electrodes, and a dummy electrode disposed at least one of the vertical positions at which the excitation electrodes are disposed and at such a position so as to have a symmetrical relationship relative to the corresponding excitation electrode with the lead-out electrode connected to the excitation electrode.

REFERENCES:
patent: 4652784 (1987-03-01), Inoue et al.
patent: 4894580 (1990-01-01), Ogawa
patent: 5294860 (1994-03-01), Gamo
patent: 5548179 (1996-08-01), Kaida

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