Energy trapping piezoelectric device and producing method thereo

Details Energy trapping piezoelectric device and producing method thereo Energy trapping piezoelectric device and producing method thereo

1997-07-10

1999-10-19

Dougherty, Thomas M.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310366, 310368, 310312, H01L 4108

Patent

active

059694637

ABSTRACT:
An energy trapping piezoelectric device trapping a thickness vibration into projections which suppress a reflection of a vibration from end portions of electrodes provided substantially on a piezoelectric plate, and which suppress unnecessary spurious vibrations, low impedance and higher frequency, and a method of easily producing such a piezoelectric device are provided. The piezoelectric device has an energy trapping projection provided over a piezoelectric plate, and a top electrode is divided into a exciting electrode and dummy electrode. A small gap is provided between the divided electrodes, and the electrodes are electrically insulated from each other. The thickness vibration is not generally reflected, and vibrating energies due to the thickness vibrations are substantially trapped into the projections provided on the piezoelectric plate.

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