US 12,323,763 B2
Laminated piezoelectric element and electroacoustic transducer
Tetsu Miyoshi, Minami-ashigara (JP)
Assigned to FUJIFILM Corporation, Tokyo (JP)
Filed by FUJIFILM Corporation, Tokyo (JP)
Filed on Jan. 11, 2024, as Appl. No. 18/410,208.
Application 18/410,208 is a division of application No. 17/314,171, filed on May 7, 2021, granted, now 11,910,159.
Application 17/314,171 is a continuation of application No. PCT/JP2019/042768, filed on Oct. 31, 2019.
Claims priority of application No. 2018-210946 (JP), filed on Nov. 8, 2018; application No. 2019-014089 (JP), filed on Jan. 30, 2019; and application No. 2019-188909 (JP), filed on Oct. 15, 2019.
Prior Publication US 2024/0147167 A1, May 2, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. H04R 17/00 (2006.01); B32B 3/04 (2006.01); B32B 7/12 (2006.01); B32B 27/20 (2006.01); B32B 27/30 (2006.01); H04R 1/06 (2006.01); H04R 7/06 (2006.01); H10N 30/50 (2023.01); H10N 30/857 (2023.01); H10N 30/87 (2023.01)
CPC H04R 17/005 (2013.01) [B32B 3/04 (2013.01); B32B 7/12 (2013.01); B32B 27/20 (2013.01); B32B 27/306 (2013.01); H04R 1/06 (2013.01); H04R 7/06 (2013.01); H10N 30/50 (2023.02); H10N 30/857 (2023.02); H10N 30/875 (2023.02); B32B 2307/20 (2013.01); B32B 2307/42 (2013.01); B32B 2457/00 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A laminated piezoelectric element comprising:
a plurality of layers of laminated piezoelectric films having a piezoelectric layer interposed between two thin film electrodes, and
a lead-out wire which is connected to the thin film electrode for connection to an external device,
wherein the piezoelectric film is polarized in a thickness direction,
polarization directions of adjacent piezoelectric films are opposite to each other, and
a value obtained by dividing a current value flowing into the lead-out wire by a width of the lead-out wire is 1 A/cm or less.