Energy-trapping-type piezoelectric resonance device
AssigneeMurata Manufacturing Co., Ltd.
InventorsAkira Ando, Toshihiko Kittaka, Yukio Sakabe, Satoru Fujishima
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Abstract
An energy trapping type piezoelectric resonance device utilizing the mode of thickness extensional vibration comprises a plate-shaped body of a piezoelectric material and three or more electrodes provided to be opposed to each other through peizoelectric material layers in the direction of thickness of the body. At least one of the electrodes is provided to be smaller in area than the major surfaces of the body, to be capable of energy trapping.
Claims10
An energy-trapping-by-frequency-lowering-type piezoelectric-resonance device utilizing the mode of thickness-extensional vibration, comprising:
- a plate-shaped body of a piezoelectric material having major surfaces;
- and
- three or more electrodes arranged opposed to each other in the direction of thickness of said body through layers of the piezoelectric material;
- and
- said electrodes being spaced apart from each other by an amount selected to result in resonance at a harmonic mode;
- and
- at least one of said electrodes being smaller in area than the major surfaces of said body, thereby to be capable of energy trapping by frequency lowering.
Dependencies are inferred from the claim text.