# US 12,109,590 B2 · Ultrasonic device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,109,590 B2 - Document ID: US12109590B2 - Status: Granted - Kind: B2 - Application number: 17/399,319 - Filed: 2021-08-11 - Published: 2022-02-17 - Granted: 2024-10-08 - Earliest claimed: 2020-08-17 - Assignees: TDK Corporation - Applicants: TDK Corporation - Inventors: Tatsuya Taki - Web page: https://patentgrep.com/patent/US12109590B2 ## CPC - B06B 1/0681: {and a damping structure} - G10K 11/002: {Devices for damping, suppressing, obstructing or conducting sound in acoustic devices (G10K1/06 - G10K1/10 take precedence; for electro-mechanical transducers for communication H04R3/002)} - G01S 7/521: Constructional features - G10K 9/22: Mountings; Casings - B06B: METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, {e.g.} FOR PERFORMING MECHANICAL WORK IN GENERAL (for particular applications, see the relevant subclasses, e.g. B07B1/40, B23Q17/12, B24B31/06; measurement of mechanical vibrations G01H; in direction finding, locating, distance or velocity measuring G01S; {generating seismic energy G01V1/02}; control of mechanical vibrations in general G05D; sound-producing devices, e.g. bells, sirens, whistles G10K, {e.g. methods or devices for transmitting, conducting, or directing sound in general G10K11/00}; generation of electrical oscillations H03B; electromechanical resonators in general H03H; electromechanical transducers {for communication techniques, e.g. microphones, speakers} H04R) - G10K: SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR - G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES ## Abstract An ultrasonic device includes a case, a piezoelectric element, a sound absorbing material, and a vibration-proof material. The case defines a housing space. The piezoelectric element is disposed in the housing space. The sound absorbing material is disposed on the piezoelectric element and is made of a foaming material. The vibration-proof material is disposed around the sound absorbing material and is in contact with an inner face of the case. Between the piezoelectric element and the sound absorbing material, a first space is formed. ## Claims ### Claim 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 the piezoelectric element and made of a foaming material; a substrate disposed in the housing space in such a way as to be opposed to the piezoelectric element via the sound absorbing material and electrically connected to the piezoelectric element, and a vibration-proof material disposed around the sound absorbing material and being in contact with an inner face of the case, wherein a first space is formed between the piezoelectric element and the sound absorbing material, and a second space is formed between the substrate and the sound absorbing material. ### Claim 2 (depends on 1) The ultrasonic device according to claim 1, wherein the second space has a thickness thinner than a thickness of the first space. ### Claim 3 (depends on 1) The ultrasonic device according to claim 1, wherein the substrate is made of glass epoxy. ### Claim 4 (depends on 1) The ultrasonic device according to claim 1, wherein the substrate includes a pair of main faces each having an oval shape. ### Claim 5 (depends on 1) The ultrasonic device according to claim 1, further comprising a damping material disposed in the first space in such a way as to be separated from the sound absorbing material. ### Claim 6 (depends on 5) The ultrasonic device according to claim 5, wherein the damping material is an elastic body. ### Claim 7 (depends on 5) The ultrasonic device according to claim 5, wherein the damping material is provided in contact with the piezoelectric element. ### Claim 8 (depends on 1) The ultrasonic device according to claim 1, wherein the piezoelectric element is positioned inside an outer edge of the sound absorbing material when viewed from a thickness direction of the piezoelectric element. ### Claim 9 (depends on 1) The ultrasonic device according to claim 1, wherein the sound absorbing material protrudes toward the piezoelectric element from the vibration-proof material in a thickness direction of the piezoelectric element. ### Claim 10 (depends on 1) The ultrasonic device according to claim 1, wherein the case includes a bottom wall on which the piezoelectric element is disposed, and the piezoelectric element is fixed to the bottom wall by bonding. ### Claim 11 (depends on 1) The ultrasonic device according to claim 1, wherein the piezoelectric element includes a piezoelectric element body and a plurality of electrodes, the piezoelectric element body includes a main face facing the first space, and the plurality of electrodes is disposed on the main face in such a way as to be separated from each other. ### Claim 12 (depends on 1) The ultrasonic device according to claim 1, wherein the sound absorbing material is made of a foaming material containing thermoplastic resin. ### Claim 13 (depends on 1) The ultrasonic device according to claim 1, wherein the vibration-proof material includes a lid body sealing an opening of the case. ### Claim 14 (depends on 1) The ultrasonic device according to claim 1, wherein the vibration-proof material is an elastic body. ### Claim 15 (depends on 1) The ultrasonic device according to claim 1, wherein the vibration-proof material has a density higher than a density of the sound absorbing material. ### Claim 16 (depends on 1) The ultrasonic device according to claim 1, further comprising: a wiring member disposed on the piezoelectric element and electrically connected to the piezoelectric element, wherein the wiring member is a flexible printed circuit or a flexible flat cable. ### Claim 17 (depends on 16) The ultrasonic device according to claim 16, wherein the wiring member is bonded to the case with insulating resin. ### Claim 18 (depends on 16) The ultrasonic device according to claim 16, wherein the first space is formed between the wiring member and the sound absorbing material. ### Claim 19 (depends on 16) The ultrasonic device according to claim 16, wherein the wiring member is formed with an opening for exposing a part of the piezoelectric element.