# US 11,122,351 B2 · Open audio device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,122,351 B2 - Document ID: US11122351B2 - Status: Granted - Kind: B2 - Application number: 16/553,751 - Filed: 2019-08-28 - Published: 2021-03-04 - Granted: 2021-09-14 - Earliest claimed: 2019-08-28 - Assignees: Bose Corporation - Applicants: Bose Corporation - Inventors: Ryan C. Struzik - Web page: https://patentgrep.com/patent/US11122351B2 ## CPC - H04R 1/1008: {Earpieces of the supra-aural or circum-aural type} - H04R 1/2849: {for loudspeaker transducers} - H04R 1/023: {Screens for loudspeakers} - H04R 1/1075: {Mountings of transducers in earphones or headphones} - H04R 1/345: {for loudspeakers} - H04R 2460/09: Non-occlusive ear tips, i.e. leaving the ear canal open, for both custom and non-custom tips (H04R2460/11 takes precedence) - 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 An open audio device that includes an acoustic radiator that emits front-side acoustic radiation from its front side and emits rear-side acoustic radiation from its rear side, a front acoustic cavity that receives front-side acoustic radiation, a front transmission line that is acoustically coupled to the front acoustic cavity and comprises a first front sound-emitting opening, and a rear acoustic cavity that receives rear-side acoustic radiation and comprises at least a first rear sound-emitting opening. ## Claims ### Claim 1 An open audio device, comprising: a housing; an acoustic radiator in the housing that emits front-side acoustic radiation from its front side and emits rear-side acoustic radiation from its rear side; a front acoustic cavity located at least in part in the housing that receives front-side acoustic radiation and defines a first front sound-emitting opening that is configured to be located anteriorly of a user's ear canal opening; a rear acoustic cavity located at least in part in the housing that receives rear-side acoustic radiation and defines at least a first rear sound-emitting opening and a separate second rear sound-emitting opening that is spaced from the first rear sound-emitting opening; and an elongated spout piece that is configured to be removably coupled to the housing such that it covers the first front sound-emitting opening and thereby lowers a resonance frequency of the front acoustic cavity, wherein the spout piece is configured to conduct sound from the first front sound-emitting opening to spout piece sound-emitting opening that is closer to the ear canal opening than is the first front sound-emitting opening, but is not in the ear canal opening, and wherein the spout piece is further configured to cover the second rear sound-emitting opening but not the first rear sound-emitting opening, and thereby lower a resonance frequency of the rear acoustic cavity. ### Claim 2 (depends on 1) The open audio device of claim 1, further comprising a second front sound-emitting opening that comprises a resistive element and is closer to the acoustic radiator than is the first front sound-emitting opening. ### Claim 3 (depends on 2) The open audio device of claim 2, wherein the first rear sound-emitting opening comprises a resistive element. ### Claim 4 (depends on 1) The open audio device of claim 1, further comprising a support structure that is configured to carry the acoustic radiator on a wearer's head such that the acoustic radiator is held proximate but not in an ear canal opening of the user. ### Claim 5 (depends on 1) The open audio device of claim 1, wherein at least one of the first and second rear sound-emitting openings comprises a resistive element. ### Claim 6 (depends on 1) The open audio device of claim 1, further comprising a processor that is configured to provide audio signals to the acoustic radiator. ### Claim 7 (depends on 6) The open audio device of claim 6, wherein the processor is configured to modify the audio signals based on whether the spout piece is coupled to the housing. ### Claim 8 (depends on 1) The open audio device of claim 1, wherein the spout piece is configured to locate the spout piece sound-emitting opening proximate but not in the ear canal opening. ### Claim 9 (depends on 8) The open audio device of claim 8, wherein the spout piece has a length and is curved along its length such that it is configured to pass over the ear tragus and locate the spout piece sound-emitting opening near but not in the ear canal opening. ### Claim 10 (depends on 1) The open audio device of claim 1, wherein the first front sound-emitting opening is configured to direct sound generally near the ear canal opening. ### Claim 11 (depends on 1) The open audio device of claim 1, wherein the second rear sound-emitting opening is closer to the ear canal opening than is the first rear sound-emitting opening. ### Claim 12 (depends on 1) The open audio device of claim 1, wherein at least one front sound-emitting opening comprises a resistive element. ### Claim 13 (depends on 12) The open audio device of claim 12, wherein a resistive element comprises a resistive screen. ### Claim 14 (depends on 1) The open audio device of claim 1, wherein at least one rear sound-emitting opening comprises a resistive element. ### Claim 15 (depends on 14) The open audio device of claim 14, wherein a resistive element comprises a resistive screen. ### Claim 16 (depends on 1) The open audio device of claim 1, further comprising a resistive opening that acoustically couples the front and rear acoustic cavities. ### Claim 17 (depends on 1) The open audio device of claim 1, wherein the housing is configured to be held on or proximate an ear of a user. ### Claim 18 (depends on 1) The open audio device of claim 1, wherein the front cavity and the spout piece together define a front fundamental resonance frequency and the rear cavity defines a rear fundamental resonance frequency, and wherein the front and rear fundamental resonance frequencies are within one octave of each other.