# US 2020/0288235 A1 · Audio speaker with back volume containing adsorptive material > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2020/0288235 A1 - Document ID: US20200288235A1 - Status: Published application - Kind: A1 - Application number: 16/883,802 - Filed: 2020-05-26 - Published: 2020-09-10 - Earliest claimed: 2015-05-18 - Assignees: Apple Inc. - Applicants: Apple Inc. - Inventors: Christopher Wilk; Ruchir M. Dave; Scott P. Porter - Web page: https://patentgrep.com/patent/US20200288235A1 ## CPC - H04R 1/288: {for loudspeaker transducers} - B01D 53/04: with stationary adsorbents {(B01D53/025 takes precedence)} - B01D 2253/102: Carbon - B01D 2253/108: Zeolites - B01D 2259/45: Gas separation or purification devices adapted for specific applications - H04R 1/2849: {for loudspeaker transducers} - 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) - B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28) ## Abstract An audio speaker having a speaker housing surrounding a back volume that is divided into a rear cavity behind a speaker driver and an adsorption cavity separated from the rear cavity by a permeable partition, is disclosed. More particularly, the adsorption cavity may be defined between the speaker housing and the permeable partition, and may be directly filled with adsorptive particles to adsorb gas during sound generation. The permeable partition may allow the gas to flow between the rear cavity and the adsorption cavity, and may retain the adsorptive particles within the adsorption cavity. Other embodiments are also described and claimed. ## Claims ### Claim 1 An audio speaker, comprising: a speaker driver; a housing including a housing wall defining a back volume; a sealing member over a fill port formed in the housing wall; and a permeable partition having a surface defining at least a portion of an adsorption cavity in the back volume, wherein the housing wall, the sealing member, and the permeable partition constrain adsorptive granules within the adsorption cavity. ### Claim 2 (depends on 1) The audio speaker of claim 1, wherein the adsorptive granules are loose adsorbent particles moveable within the adsorption cavity to directly contact one or more of the housing wall, the permeable partition, or the sealing member. ### Claim 3 (depends on 1) The audio speaker of claim 1, wherein at least a portion of the adsorptive granules within the adsorption cavity adhere to an inner surface of the housing wall. ### Claim 4 (depends on 1) The audio speaker of claim 1 further comprising a seal at an interface between the housing and the permeable partition. ### Claim 5 (depends on 1) The audio speaker of claim 1, wherein the permeable partition includes a mesh structure. ### Claim 6 (depends on 1) The audio speaker of claim 1, wherein the speaker driver includes a diaphragm having a central axis, and wherein the adsorption cavity is laterally offset from the central axis. ### Claim 7 (depends on 1) The audio speaker of claim 1, wherein the housing provides a direct fill enclosure to receive the adsorptive granules directly through the fill port. ### Claim 8 An audio speaker, comprising: a speaker driver; a housing including a housing wall defining a back volume; a permeable partition to form an adsorption cavity in the back volume; and a sealing member over a fill port formed in the housing wall, wherein the sealing member has a surface defining at least a portion of the adsorption cavity, and wherein the housing wall, the permeable partition, and the sealing member constrain adsorptive granules within the adsorption cavity. ### Claim 9 (depends on 8) The audio speaker of claim 8, wherein the adsorptive granules are loose adsorbent particles moveable within the adsorption cavity to directly contact one or more of the housing wall, the permeable partition, or the sealing member. ### Claim 10 (depends on 8) The audio speaker of claim 8, wherein at least a portion of the adsorptive granules within the adsorption cavity adhere to an inner surface of the housing wall. ### Claim 11 (depends on 8) The audio speaker of claim 8, wherein the speaker driver includes a diaphragm having a central axis, and wherein the adsorption cavity is laterally offset from the central axis. ### Claim 12 (depends on 8) The audio speaker of claim 8, wherein the housing provides a direct fill enclosure to receive the adsorptive granules directly through the fill port. ### Claim 13 (depends on 8) The audio speaker of claim 8, wherein the sealing member seals the fill port. ### Claim 14 An electronic device, comprising: a device housing; and an audio speaker within the device housing, the audio speaker including a speaker driver, a housing including a housing wall defining a back volume, a sealing member over a fill port formed in the housing wall, and a permeable partition to form an adsorption cavity within the back volume, wherein a surface of one or more of the sealing member or the permeable partition defines at least a portion of the adsorption cavity, and wherein the housing wall, the permeable partition, and the sealing member constrain adsorptive granules within the adsorption cavity. ### Claim 15 (depends on 14) The electronic device of claim 14, wherein the adsorptive granules are loose adsorbent particles moveable within the adsorption cavity to directly contact one or more of the housing wall, the permeable partition, or the sealing member. ### Claim 16 (depends on 14) The electronic device of claim 14, wherein at least a portion of the adsorptive granules within the adsorption cavity adhere to an inner surface of the housing wall. ### Claim 17 (depends on 14) The electronic device of claim 14, wherein the permeable partition includes a mesh structure. ### Claim 18 (depends on 14) The electronic device of claim 14, wherein the speaker driver includes a diaphragm having a central axis, and wherein the adsorption cavity is laterally offset from the central axis. ### Claim 19 (depends on 14) The electronic device of claim 14, wherein the housing provides a direct fill enclosure to receive the adsorptive granules directly through the fill port. ### Claim 20 (depends on 14) The electronic device of claim 14, wherein the audio speaker is a micro speaker.