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    • 3. 发明公开
    • LAMINATED PIEZOELECTRIC ELEMENT, AND INJECTION DEVICE AND FUEL-INJECTION SYSTEM CONTAINING SAID LAMINATED PIEZOELECTRIC ELEMENT
    • LAMINIERTES PIEZOELEKTRISCHES ELEMENT SOWIE EINSPRITZVORRICHUNG UND KRAFTSTOFFEINSPRITZSYSTEM MIT DIESEM LAMINIERTEN PIEZOELEKTRISCHEN ELEMENT
    • EP3101701A4
    • 2017-10-04
    • EP14880620
    • 2014-08-29
    • KYOCERA CORP
    • KATO TAKESHI
    • H01L41/047F02M51/06H01L41/083
    • H01L41/0838F02M51/0603H01L41/0472
    • [Object] To provide a multi-layer piezoelectric element that minimizes detachment of an external electrode plate and crack formation in an electrically conductive bonding material. Also, to provide an injection device and a fuel-injection system containing the multi-layer piezoelectric element. [Solution] A multi-layer piezoelectric element (1) comprising the following: a stacked body (4) including an active section (4a) including piezoelectric layers (2) and internal electrode layers (3) laminated together and an inactive section (4b) located outside the active section (4a) in the stacking direction; an electrically conductive bonding material (5) disposed on a side surface of the stacked body (4) parallel to the stacking direction; and an external electrode plate (6) connected to the side surface of the stacked body (4) with the electrically conductive bonding material (5) interposed therebetween. One end of the external electrode plate (6) extends past the electrically conductive bonding material (5) in the stacking direction, and the external electrode plate (6) includes, on said end, an area connected to an external circuit. The electrically conductive bonding material (5) includes a wider region (51) with a greater width than other regions, at one end thereof closer to the one end than to the other end, both of the external electrode plate (6).
    • 本发明的目的在于提供一种使导电性接合材料中的外部电极板的剥离和裂纹形成最小化的层叠型压电元件。 另外,提供一种包含该层叠型压电元件的喷射装置和燃料喷射系统。 一种层叠型压电元件(1),其特征在于,包括层叠体(4),该层叠体(4)包括层叠有压电体层(2)和内部电极层(3)的有源部(4a) )在堆叠方向上位于有效部分(4a)的外部; 导电接合材料(5),所述导电接合材料(5)设置在所述堆叠体(4)的平行于所述堆叠方向的侧表面上; 和经由导电性接合材料(5)与层叠体(4)的侧面连接的外部电极板(6)。 外部电极板(6)的一端在层叠方向上越过导电性接合材料(5),外部电极板(6)在所述端部具有与外部电路连接的区域。 导电接合材料5包括宽度大于其它区域的宽区域51,在其一端比外端电极板6的一端更靠近另一端。