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1. (WO2018123354) PIEZOELECTRIC ELEMENT

Pub. No.:    WO/2018/123354    International Application No.:    PCT/JP2017/041775
Publication Date: Fri Jul 06 01:59:59 CEST 2018 International Filing Date: Wed Nov 22 00:59:59 CET 2017
IPC: H01L 41/047
G01L 1/16
H01L 41/083
H01L 41/113
Applicants: KYOCERA CORPORATION
京セラ株式会社
Inventors: ASAKURA,Yasuhiro
浅倉 康弘
Title: PIEZOELECTRIC ELEMENT
Abstract:
A piezoelectric element 1 according to the present disclosure is provided with a laminate 2 in which a piezoelectric body 21 and an internal electrode 22 are alternatingly laminated, an external electrode 3 which is provided to a side face of the laminate 2 and is electrically connected to the internal electrode 22, and a lead wire 4 which is electrically connected to the external electrode 3. Furthermore, a reaction layer 5 of the external electrode 3 and the lead wire 4 is provided at the site where the external electrode 3 and the lead wire 4 join. The reaction layer 5 has a thickness which matches the lead wire 4 when viewed in a cross-section perpendicular to the axial direction of the lead wire 4, the thickness of the central section of the width being greatest. Stress caused by a difference in thermal expansion between the reaction layer 5 of the external electrode 3 and the lead wire 4 and neighboring members is thereby reduced, making it possible to suppress cracks.