# US 2019/0378488 A1 · Broadband ultrathin acoustic wave diffusion structure > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0378488 A1 - Document ID: US20190378488A1 - Status: Published application - Kind: A1 - Application number: 16/487,389 - Filed: 2017-04-26 - Published: 2019-12-12 - Earliest claimed: 2017-04-26 - Assignees: Dalian University of Technology - Applicants: Dalian University of Technology - Inventors: Yulin MEI; Xiaoming WANG; Yixuan MEI - Web page: https://patentgrep.com/patent/US20190378488A1 ## CPC - G10K 11/162: Selection of materials - G10K 11/18: Methods or devices for transmitting, conducting or directing sound (G10K11/02, G10K11/36 take precedence) - G10K 11/20: Reflecting arrangements (G10K11/28 takes precedence) - H04R 1/2857: {for loudspeaker transducers} - 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 - 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 broadband ultrathin acoustic wave diffusion structure has a plurality of acoustic wave diffusion units. Each acoustic wave diffusion unit has at least one acoustic wave propagation section, and an acoustic wave focused section communicating with the acoustic wave propagation section is arranged according to needs. The acoustic wave focused section is formed by an acoustic wave focused cavity filled with acoustic material. The acoustic wave focused cavity is a variable-section cavity. The acoustic wave propagation section is formed by a simply connected acoustic wave propagation passage with a close end. Different acoustic wave diffusion units have different lengths of the simply connected acoustic wave propagation passages. The maximum length of the simply connected acoustic wave propagation passage may be dozens or even hundreds of times of the thickness of the acoustic wave diffusion structure, which can meet the diffusion requirements for low frequency acoustic waves to the maximum extent. ## Claims ### Claim at position 1 1-8. (canceled) ### Claim 9 A broadband ultrathin acoustic wave diffusion structure, comprising a plurality of acoustic wave diffusion units, wherein each acoustic wave diffusion unit comprises at least one acoustic wave propagation section, and an acoustic wave focused section communicating with the acoustic wave propagation section is arranged according to needs; the acoustic wave focused section is formed by an acoustic wave focused cavity filled with acoustic material; the acoustic wave focused cavity is a variable-section cavity, and isotropic or anisotropic acoustic material is filled in the variable-section cavity; the acoustic wave propagation section is formed by a simply connected acoustic wave propagation passage with a close end; and in different acoustic wave diffusion units, the simply connected acoustic wave propagation passages have different lengths; some acoustic wave diffusion units have no acoustic wave focused section, and only comprise the acoustic wave propagation sections; some acoustic wave diffusion units comprise acoustic wave focused sections and acoustic wave propagation sections, and the acoustic wave focused cavities of the acoustic wave focused sections communicate with the simply connected acoustic wave propagation passages of the acoustic wave propagation sections; for the acoustic wave diffusion unit comprising the acoustic wave focused section and the acoustic wave propagation section, the simply connected acoustic wave propagation passage of the acoustic wave propagation section is closely arranged through the measures of circuitry, bending, coiling or stacking in a monolayer or multilayer or spatial spiral structural form, and occupies part or whole of available space of the broadband ultrathin acoustic wave diffusion structure. ### Claim 10 (depends on 9) The broadband ultrathin acoustic wave diffusion structure of claim 9, wherein the anisotropic acoustic material is formed by embedding membranes or string nets into the isotropic acoustic material. ### Claim 11 (depends on 9) The broadband ultrathin acoustic wave diffusion structure of claim 9, wherein for the acoustic wave diffusion unit comprising the acoustic wave focused section and the acoustic wave propagation section, the arrangement solutions of the simply connected acoustic wave propagation passage of the acoustic wave propagation section include: (1) the simply connected acoustic wave propagation passage is closely arranged inside its own acoustic wave diffusion unit through the measures of circuitry, bending, coiling or stacking in a monolayer or multilayer or spatial spiral structural form, and occupies the part or the whole of available space outside the acoustic wave focused section; and (2) the simply connected acoustic wave propagation passage is closely arranged inside the broadband ultrathin acoustic wave diffusion structure through the measures of circuitry, bending, coiling or stacking in a monolayer or multilayer or spatial spiral structural form, occupies the whole of available space inside its own acoustic wave diffusion unit and also extends to other acoustic wave diffusion units to occupy the remaining available space inside other acoustic wave diffusion units, especially occupy the remaining space of the acoustic wave diffusion units with short simply connected acoustic wave propagation passages. ### Claim 12 (depends on 10) The broadband ultrathin acoustic wave diffusion structure of claim 10, wherein for the acoustic wave diffusion unit comprising the acoustic wave focused section and the acoustic wave propagation section, the arrangement solutions of the simply connected acoustic wave propagation passage of the acoustic wave propagation section include: (1) the simply connected acoustic wave propagation passage is closely arranged inside its own acoustic wave diffusion unit through the measures of circuitry, bending, coiling or stacking in a monolayer or multilayer or spatial spiral structural form, and occupies the part or the whole of available space outside the acoustic wave focused section; and (2) the simply connected acoustic wave propagation passage is closely arranged inside the broadband ultrathin acoustic wave diffusion structure through the measures of circuitry, bending, coiling or stacking in a monolayer or multilayer or spatial spiral structural form, occupies the whole of available space inside its own acoustic wave diffusion unit and also extends to other acoustic wave diffusion units to occupy the remaining available space inside other acoustic wave diffusion units, especially occupy the remaining space of the acoustic wave diffusion units with short simply connected acoustic wave propagation passages. ### Claim 13 (depends on 10) The broadband ultrathin acoustic wave diffusion structure of claim 10, wherein the membrane of the anisotropic acoustic material is a non-porous membrane or porous membrane, and is made of metal or nonmetallic, including cotton, fiber, silk, burlap, woolen cloth, mixture yarn and leather; and the string net of the anisotropic acoustic material is made of metal or nonmetallic. ### Claim 14 (depends on 12) The broadband ultrathin acoustic wave diffusion structure of claim 12, wherein the membrane of the anisotropic acoustic material is a non-porous membrane or porous membrane, and is made of metal or nonmetallic, including cotton, fiber, silk, burlap, woolen cloth, mixture yarn and leather; and the string net of the anisotropic acoustic material is made of metal or nonmetallic. ### Claim 15 (depends on 9) The broadband ultrathin acoustic wave diffusion structure of claim 9, wherein the acoustic material is gas material, solid material or liquid material, including air, helium, gel, polyurethane, polyester, epoxy resin, foamed plastics, foamed metal, soft rubber, silicone rubber, butyl rubber, glass wool, glass fiber, felt, silk, cloth and micro-perforated panel. ### Claim 16 (depends on 10) The broadband ultrathin acoustic wave diffusion structure of claim 10, wherein the acoustic material is gas material, solid material or liquid material, including air, helium, gel, polyurethane, polyester, epoxy resin, foamed plastics, foamed metal, soft rubber, silicone rubber, butyl rubber, glass wool, glass fiber, felt, silk, cloth and micro-perforated panel. ### Claim 17 (depends on 11) The broadband ultrathin acoustic wave diffusion structure of claim 11, wherein the acoustic material is gas material, solid material or liquid material, including air, helium, gel, polyurethane, polyester, epoxy resin, foamed plastics, foamed metal, soft rubber, silicone rubber, butyl rubber, glass wool, glass fiber, felt, silk, cloth and micro-perforated panel. ### Claim 18 (depends on 12) The broadband ultrathin acoustic wave diffusion structure of claim 12, wherein the acoustic material is gas material, solid material or liquid material, including air, helium, gel, polyurethane, polyester, epoxy resin, foamed plastics, foamed metal, soft rubber, silicone rubber, butyl rubber, glass wool, glass fiber, felt, silk, cloth and micro-perforated panel. ### Claim 19 (depends on 13) The broadband ultrathin acoustic wave diffusion structure of claim 13, wherein the acoustic material is gas material, solid material or liquid material, including air, helium, gel, polyurethane, polyester, epoxy resin, foamed plastics, foamed metal, soft rubber, silicone rubber, butyl rubber, glass wool, glass fiber, felt, silk, cloth and micro-perforated panel. ### Claim 20 (depends on 14) The broadband ultrathin acoustic wave diffusion structure of claim 14, wherein the acoustic material is gas material, solid material or liquid material, including air, helium, gel, polyurethane, polyester, epoxy resin, foamed plastics, foamed metal, soft rubber, silicone rubber, butyl rubber, glass wool, glass fiber, felt, silk, cloth and micro-perforated panel.