US 12,120,960 B2
Piezoelectric speaker
Yusuke Komoto, Osaka (JP); Kohei Oto, Osaka (JP); Saori Yamamoto, Osaka (JP); Ryohei Oban, Osaka (JP); and Tomoaki Hishiki, Osaka (JP)
Assigned to NITTO DENKO CORPORATION, Osaka (JP)
Appl. No. 16/765,796
Filed by NITTO DENKO CORPORATION, Ibaraki (JP)
PCT Filed Nov. 20, 2018, PCT No. PCT/JP2018/042910
§ 371(c)(1), (2) Date May 20, 2020,
PCT Pub. No. WO2019/103018, PCT Pub. Date May 31, 2019.
Claims priority of application No. 2017-223793 (JP), filed on Nov. 21, 2017; and application No. 2017-223800 (JP), filed on Nov. 21, 2017.
Prior Publication US 2020/0287125 A1, Sep. 10, 2020
Int. Cl. H02N 2/00 (2006.01); B32B 7/025 (2019.01); B32B 7/12 (2006.01); H04R 17/00 (2006.01); H10N 30/20 (2023.01); H10N 30/857 (2023.01)
CPC H10N 30/857 (2023.02) [B32B 7/025 (2019.01); B32B 7/12 (2013.01); H04R 17/00 (2013.01); H10N 30/2047 (2023.02)] 17 Claims
OG exemplary drawing
 
1. A piezoelectric speaker, comprising:
a piezoelectric film comprising a first electrode, a second electrode, and a piezoelectric body sandwiched by the first electrode and the second electrode;
a first joining layer having pressure-sensitive adhesiveness or adhesiveness;
an interposed layer disposed between the piezoelectric film and the first joining layer; and
a second joining layer having pressure-sensitive adhesiveness or adhesiveness, wherein
both principal surfaces of the piezoelectric film vibrate up and down as a whole,
the second joining layer is disposed between the first electrode and the interposed layer,
the first electrode includes a first surface as one of the principal surfaces of the piezoelectric film,
the second joining layer includes a second surface and a third surface,
the interposed layer includes a fourth surface,
the second surface is in immediate physical contact with the first surface, and
the third surface is in immediate physical contact with the fourth surface.