Title:
積層型圧電素子およびこれを備えた噴射装置ならびに燃料噴射システム
Document Type and Number:
Japanese Patent JP5414798
Kind Code:
B2
Abstract:
[Problem] A center of a multi-layer piezoelectric element is an active region and deforms to a greater degree than ends thereof which is an inactive region during driving operation, and is therefore more susceptible to stress concentration and crack development. [Solution] A multi-layer piezoelectric element (1) includes a columnar stacked body (15) in which piezoelectric layers (11) and internal electrode layers (13) are alternately laminated, and a pair of external electrodes configured to bond to side faces of the columnar stacked body (15), wherein a side face of the columnar stacked body (15) is configured so that a surface roughness of a center of the side face in a stacked direction of the columnar stacked body (15) is greater than those of ends of the side face in the stacked direction of the columnar stacked body (15). This makes it possible to relax the stress exerted on the side face of the columnar stacked body (15), and thereby enhance the durability of the multi-layer piezoelectric element (1).
Inventors:
Tetsuro Sata
Application Number:
JP2011528839A
Publication Date:
February 12, 2014
Filing Date:
August 26, 2010
Export Citation:
Assignee:
Kyocera Corporation
International Classes:
H01L41/083; F02M51/00; F02M51/06; H01L41/053; H01L41/09; H01L41/273; H01L41/337
Domestic Patent References:
| JP2001339105A | 2001-12-07 | |||
| JP2002370217A | 2002-12-24 | |||
| JP2003017779A | 2003-01-17 | |||
| JP2003017768A | 2003-01-17 | |||
| JP2001102647A | 2001-04-13 | |||
| JP2001339105A | 2001-12-07 | |||
| JP2002370217A | 2002-12-24 | |||
| JP2003017779A | 2003-01-17 | |||
| JP2003017768A | 2003-01-17 | |||
| JP2001102647A | 2001-04-13 |
Foreign References:
| WO2009041476A1 | 2009-04-02 | |||
| WO2009041476A1 | 2009-04-02 |