US 12,070,774 B2
Ultrasonic device having sound absorbing material with uneven shape
Tatsuya Taki, Tokyo (JP)
Assigned to TDK CORPORATION, Tokyo (JP)
Filed by TDK CORPORATION, Tokyo (JP)
Filed on Aug. 27, 2021, as Appl. No. 17/459,579.
Claims priority of application No. 2020-146109 (JP), filed on Aug. 31, 2020.
Prior Publication US 2022/0062950 A1, Mar. 3, 2022
Int. Cl. B06B 1/06 (2006.01); G10K 11/00 (2006.01); G10K 11/162 (2006.01)
CPC B06B 1/0681 (2013.01) [G10K 11/002 (2013.01); G10K 11/162 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An ultrasonic device comprising:
a case defining a housing space;
a piezoelectric element disposed in the housing space;
a sound absorbing material disposed on a main face of the piezoelectric element and made of a foaming material; and
a vibration-proof material disposed around the sound absorbing material, wherein
the sound absorbing material includes a first opposing face opposed to the main face, and
the first opposing face has an uneven shape in which a plurality of protruding portions and a plurality of depression portions are alternately continued, and is rougher than the main face.