US 12,396,368 B2
Piezoelectric element
Yusuke Kagawa, Minamiashigara (JP); Teruo Ashikawa, Minamiashigara (JP); and Kazuo Hiraguchi, Minamiashigara (JP)
Assigned to FUJIFILM Corporation, Tokyo (JP)
Filed by FUJIFILM Corporation, Tokyo (JP)
Filed on Apr. 14, 2022, as Appl. No. 17/720,499.
Application 17/720,499 is a continuation of application No. PCT/JP2020/035426, filed on Sep. 18, 2020.
Claims priority of application No. 2019-188569 (JP), filed on Oct. 15, 2019.
Prior Publication US 2022/0238785 A1, Jul. 28, 2022
Int. Cl. H10N 30/88 (2023.01); H04R 17/00 (2006.01); H10N 30/02 (2023.01); H10N 30/85 (2023.01); H10N 30/87 (2023.01)
CPC H10N 30/883 (2023.02) [H04R 17/005 (2013.01); H10N 30/02 (2023.02); H10N 30/852 (2023.02); H10N 30/87 (2023.02)] 19 Claims
OG exemplary drawing
 
1. A piezoelectric element comprising:
a piezoelectric layer;
electrode layers formed on both sides of the piezoelectric layer; and
a protective layer laminated on a surface of at least one of the electrode layers opposite to a surface on a piezoelectric layer side,
wherein the protective layer has a hole that penetrates from a surface to at least one of the electrode layers, and
the piezoelectric element includes a filling member made of a conductive material, which is formed from an inside of the hole to a part of the surface of the protective layer and is electrically connected to at least one of the electrode layers,
a conductive member which covers at least a part of the filling member and is electrically connected to the filling member, and
a fixing member for fixing the conductive member to a surface of the protective layer opposite to at least one of the electrode layers.