# US 12,604,135 B2 · Sound producing apparatus and wearable sound device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,604,135 B2 - Document ID: US12604135B2 - Status: Granted - Kind: B2 - Application number: 19/287,776 - Filed: 2025-07-31 - Published: 2026-02-12 - Granted: 2026-04-14 - Earliest claimed: 2024-08-08 - Assignees: xMEMS Labs, Inc. - Applicants: xMEMS Labs, Inc. - Inventors: Huann-Yau Wang; Chia-Wen Lee - Web page: https://patentgrep.com/patent/US12604135B2 ## CPC - H04R 1/2811: {for loudspeaker transducers} - H04R 17/00: Piezoelectric transducers; Electrostrictive transducers (piezoelectric or electrostrictive elements in general H10N30/00; details of piezoelectric or electrostrictive motors, generators or positioners {H10N30/00}) - H04R 1/025: {Arrangements for fixing loudspeaker transducers, e.g. in a box, furniture} - H04R 1/1016: {Earpieces of the intra-aural type} - H04R 1/2842: {for loudspeaker transducers} - H04R 1/345: {for loudspeakers} - H04R 19/02: Loudspeakers (H04R19/01 takes precedence) - H04R 23/00: Transducers other than those covered by groups H04R9/00 - H04R21/00 {(diaphragms for transducers of the distributed-mode type H04R7/045)} - H04R 2201/003: Mems transducers or their use - H04R 2217/03: Parametric transducers where sound is generated or captured by the acoustic demodulation of amplitude modulated ultrasonic waves - H04R: LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS (producing sounds with frequency not determined by supply frequency G10K) ## Abstract A sound producing apparatus includes an airflow generator configured to generate an airflow, a first resonance chamber and a second resonance chamber. The second resonance chamber is stacked on the first resonance chamber. A sound is produced via the airflow generated by the airflow generator passing through the first resonance chamber and the second resonance chamber. ## Claims ### Claim 1 A sound producing apparatus, comprising: an air-pulse generating package, comprising an airflow generator configured to generate an airflow and a first covering structure; a first resonance chamber and a second resonance chamber; and a second covering structure, disposed on the air-pulse generating package; wherein the second covering structure comprises a sealing structure and a covering layer; wherein the second resonance chamber is stacked on the first resonance chamber; wherein a sound is produced via the airflow generated by the airflow generator passing through the first resonance chamber and the second resonance chamber. ### Claim 2 (depends on 1) The sound producing apparatus of claim 1, wherein the airflow generator comprises an air-pulse generating device, configured to produce a plurality of airflow pulses at an ultrasonic frequency; wherein the airflow comprises the plurality of airflow pulses. ### Claim 3 (depends on 2) The sound producing apparatus of claim 2, wherein the air-pulse generating device comprises a flap pair, the flap pair comprises a first flap and a second flap opposite to each other. ### Claim 4 (depends on 3) The sound producing apparatus of claim 3, wherein the flap pair performs a differential movement to form an opening at the ultrasonic frequency. ### Claim 5 (depends on 3) The sound producing apparatus of claim 3, wherein the flap pair performs a common mode movement and a differential movement; wherein the air-pulse generating device produces the plurality of airflow pulses via the flap pair performing the common mode movement and the differential movement. ### Claim 6 (depends on 1) The sound producing apparatus of claim 1, comprising: wherein the first resonance chamber is formed between the airflow generator and the first covering structure. ### Claim 7 (depends on 1) The sound producing apparatus of claim 1, wherein the first covering structure comprises a plurality of first outlets formed on a top side of the first covering structure. ### Claim 8 (depends on 1) The sound producing apparatus of claim 1, comprising: wherein the second resonance chamber is formed within the second covering structure. ### Claim 9 (depends on 1) The sound producing apparatus of claim 1, wherein a hollow cavity is formed within the sealing structure. ### Claim 10 (depends on 9) The sound producing apparatus of claim 9, wherein the covering layer covers the sealing structure; wherein the second resonance chamber is formed between the covering layer, the sealing structure and the first covering structure because of the hollow cavity. ### Claim 11 (depends on 9) The sound producing apparatus of claim 9, wherein a diameter of the hollow cavity within the sealing structure is gradually narrow from the first covering structure to the covering layer. ### Claim 12 (depends on 1) The sound producing apparatus of claim 1, wherein the sealing structure is a gasket. ### Claim 13 (depends on 1) The sound producing apparatus of claim 1, wherein the covering layer comprises a plastic layer, a polymer layer or a polyester layer. ### Claim 14 (depends on 1) The sound producing apparatus of claim 1, wherein the second covering structure comprises at least a second outlet formed on a top side of the second covering structure. ### Claim 15 (depends on 1) The sound producing apparatus of claim 1, wherein the second resonance chamber is configured to enhance an acoustic impedance of the sound producing apparatus at the ultrasonic frequency. ### Claim 16 A wearable sound device, comprising: a housing; and a sound producing apparatus, comprising: an air-pulse generating package, comprising an airflow generator configured to generate an airflow and a first covering structure; a first resonance chamber and a second resonance chamber; and a second covering structure, disposed on the air-pulse generating package; wherein the second covering structure comprises a sealing structure and a covering layer; wherein the second resonance chamber is stacked on the first resonance chamber; wherein a sound is produced via the airflow generated by the airflow generator passing through the first resonance chamber and the second resonance chamber. ### Claim 17 (depends on 16) The wearable sound device of claim 16, wherein the airflow generator comprises an air-pulse generating device, configured to produce a plurality of airflow pulses at an ultrasonic frequency; wherein the airflow comprises the plurality of airflow pulses. ### Claim 18 (depends on 17) The wearable sound device of claim 17, wherein the air-pulse generating device comprises a flap pair, the flap pair comprises a first flap and a second flap opposite to each other. ### Claim 19 (depends on 18) The wearable sound device of claim 18, wherein the flap pair performs a common mode movement and a differential movement; wherein the air-pulse generating device produces the plurality of airflow pulses via the flap pair performing the common mode movement and the differential movement. ### Claim 20 (depends on 16) The wearable sound device of claim 16, comprising: wherein the first resonance chamber is formed between the airflow generator and the first covering structure. ### Claim 21 (depends on 16) The wearable sound device of claim 16, comprising: wherein the second resonance chamber is formed within the second covering structure. ### Claim 22 (depends on 16) The wearable sound device of claim 16, comprising: an ear tip; wherein the wearable sound device is an in-ear wearable sound device.