Invention Grant
- Patent Title: Piezoelectric generating element and method for estimating power generation amount of piezoelectric generating element
- Patent Title (中): 压电发电元件及压电发电元件的发电量的估计方法
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Application No.: US13859905Application Date: 2013-04-10
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Publication No.: US08669695B2Publication Date: 2014-03-11
- Inventor: Satoshi Wada
- Applicant: Murata Manufacturing Co., Ltd. , TDK Corporation , Fuji Ceramics Corporation
- Applicant Address: JP Nagaokakyo-Shi, Kyoto-Fu JP Tokyo JP Fujinomiya-Shi, Shizuoka
- Assignee: Murata Manufacturing Co., Ltd.,TDK Corporation,Fuji Ceramics Corporation
- Current Assignee: Murata Manufacturing Co., Ltd.,TDK Corporation,Fuji Ceramics Corporation
- Current Assignee Address: JP Nagaokakyo-Shi, Kyoto-Fu JP Tokyo JP Fujinomiya-Shi, Shizuoka
- Agency: Dickstein Shapiro LLP
- Priority: JP2010-241988 20101028; JP2011-230753 20111020
- Main IPC: H01L41/08
- IPC: H01L41/08

Abstract:
Provided is a piezoelectric generating element having an electrode on an outer surface of a piezoelectric ceramic body, wherein the piezoelectric ceramic body has a relative permittivity of 110 to 1700, an elastic compliance of 15 to 150 pm2/N, and a void ratio of 20 to 75%. Preferably, the void ratio is 50 to 75% in the piezoelectric generating element. A crystal particle is modeled as a cube with a length X on a side, a virtual void portion is provided in cube, a void ratio x is calculated based on a thickness t of a frame excluding void portion, a relative permittivity εr and an elastic compliance s are calculated based on void ratio x, and a power generation amount P is estimated. Thereby, a piezoelectric generating element capable of significantly increasing a power generation amount more than before, and a method for estimating a power generation amount of the piezoelectric generating element can be obtained.
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