圧電素子

Japanese Patent JP7259075

B2

Provided is a piezoelectric element capable of preventing the occurrence of poor connection to an electrode layer.A piezoelectric element includes a piezoelectric layer, electrode layers formed on both sides of the piezoelectric layer, and a protective layer laminated on a surface of the electrode layer opposite to a surface on a piezoelectric layer side, in which the piezoelectric element includes a conductive foil laminated on a surface of the protective layer opposite to the electrode layer, the protective layer has a hole that penetrates from a surface to the electrode layer, the conductive foil includes an opening portion at a position that overlaps with the hole of the protective layer in a surface direction, the piezoelectric element includes a filling member consisting of a conductive material, which is formed on at least a part of a surface of the conductive foil from insides of the hole of the protective layer and an opening portion of the conductive foil and is electrically connected to the electrode layer and the conductive foil, and a covering member that covers the filling member and the conductive foil, the covering member has a through-hole at a position that does not overlap with the filling member in the surface direction, and the piezoelectric element includes a conductive member, which is inserted into the through-hole of the covering member and electrically connected to the conductive foil.

Yusuke Kagawa
Teruo Ashikawa
Hiraguchi Kazuo

JP2021555987A

April 17, 2023

October 27, 2020

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FUJIFILM Corporation

H10N30/87; H04R17/00; H10N30/20; H10N30/85

JP2015220434A
JP2017045984A
JP2015109627A
JP2016015354A

WO2016181965A1
WO2019093092A1

Hideaki Ito
Fumio Mihashi

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