US 12,120,483 B2
Audio device
Yoshiki Ohta, Tokyo (JP); Takuto Horii, Tokyo (JP); Yoshikazu Shimura, Tokyo (JP); Atsushi Ezawa, Tokyo (JP); Miho Bamba, Tokyo (JP); Kaoru Kijima, Tokyo (JP); and Akihiro Takeda, Tokyo (JP)
Assigned to TDK CORPORATION, Tokyo (JP)
Appl. No. 17/424,257
Filed by TDK CORPORATION, Tokyo (JP)
PCT Filed Jan. 20, 2020, PCT No. PCT/JP2020/001689
§ 371(c)(1), (2) Date Jul. 20, 2021,
PCT Pub. No. WO2020/153290, PCT Pub. Date Jul. 30, 2020.
Claims priority of application No. 2019-007977 (JP), filed on Jan. 21, 2019.
Prior Publication US 2022/0070575 A1, Mar. 3, 2022
Int. Cl. H01L 41/047 (2006.01); H04R 1/24 (2006.01); H04R 7/04 (2006.01); H04R 17/00 (2006.01); H10N 30/20 (2023.01); H10N 30/50 (2023.01); H10N 30/87 (2023.01)
CPC H04R 1/24 (2013.01) [H04R 7/04 (2013.01); H04R 17/00 (2013.01); H10N 30/2047 (2023.02); H10N 30/50 (2023.02); H10N 30/874 (2023.02); H10N 30/875 (2023.02)] 19 Claims
OG exemplary drawing
 
1. An audio device comprising:
a vibration member; and
a first piezoelectric vibrator and a second piezoelectric vibrator on the vibration member, wherein
a natural frequency of the first piezoelectric vibrator is larger than a natural frequency of the second piezoelectric vibrator,
the first piezoelectric vibrator is one of a pair of first piezoelectric vibrators,
the pair of first piezoelectric vibrators is on both sides of a straight line which passes through a gravity center of a main face of the vibration member when viewed from a direction orthogonal to the main face of the vibration member,
a distance between the first piezoelectric vibrator and the gravity center is shorter than a distance between the second piezoelectric vibrator and the gravity center,
the pair of first piezoelectric vibrators is spaced apart from the gravity center, and
the second piezoelectric vibrator is spaced apart from the gravity center.