US 12,335,685 B2
Vibration device
Akira Satoh, Tokyo (JP); and Kaoru Kijima, Tokyo (JP)
Assigned to TDK CORPORATION, Tokyo (JP)
Filed by TDK CORPORATION, Tokyo (JP)
Filed on Dec. 12, 2022, as Appl. No. 18/079,346.
Claims priority of application No. 2022-004948 (JP), filed on Jan. 17, 2022.
Prior Publication US 2023/0232161 A1, Jul. 20, 2023
Int. Cl. H04R 25/00 (2006.01); H04R 1/02 (2006.01); H04R 17/00 (2006.01); H10N 30/87 (2023.01); H10N 30/88 (2023.01)
CPC H04R 17/00 (2013.01) [H04R 1/025 (2013.01); H10N 30/875 (2023.02); H10N 30/88 (2023.02)] 17 Claims
OG exemplary drawing
 
1. A vibration device comprising:
a piezoelectric unit including a piezoelectric element; and
a housing made of metal that holds the piezoelectric unit,
wherein the housing includes a bottom surface portion to which the piezoelectric unit is fixed, and side surface portions that stand at an edge portion of the bottom surface portion to surround the piezoelectric unit, and
the side surface portions are continuous with the bottom surface portion, and are inclined to open outward from the edge portion with respect to the bottom surface portion, wherein
both a ridge portion of the piezoelectric element and a connection portion between the bottom surface portion and the side surface portion have a curved shape, and
a curvature radius of the connection portion is larger than a curvature radius of the ridge portion of the piezoelectric element.