# US 2020/0288236 A1 · Loudspeaker with waveguide > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2020/0288236 A1 - Document ID: US20200288236A1 - Status: Published application - Kind: A1 - Application number: 16/296,305 - Filed: 2019-03-08 - Published: 2020-09-10 - Earliest claimed: 2019-03-08 - Assignees: Bose Corporation - Applicants: Bose Corporation - Inventors: Greg Joseph Zastoupil - Web page: https://patentgrep.com/patent/US20200288236A1 ## CPC - H04R 1/34: by using a single transducer with sound reflecting, diffracting, directing or guiding means {(specially adapted for hearing aids H04R25/402)} - H04R 1/30: Combinations of transducers with horns, e.g. with mechanical matching means {, i.e. front-loaded horns}(horns in general G10K; {transducer enclosures or mountings using a back-loaded horn H04R1/2861; application of horns as guiding means to obtain a predetermined directivity characteristic H04R1/345}) - H04R 1/345: {for loudspeakers} - H04R 7/127: {dome-shaped} - H04R 9/06: Loudspeakers - H04R 2201/34: Directing or guiding sound by means of a phase plug - H04R 2400/13: Use or details of compression drivers - 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 Various implementations include loudspeakers. In some particular cases, a loudspeaker includes: a diaphragm; a basket; an electro-magnetic motor supported by the basket and coupled to the diaphragm for driving motion of the diaphragm relative to the basket along a motion axis; a surround coupling an outer peripheral edge of the diaphragm to the basket; and a waveguide coupled to the basket and surrounding the diaphragm. The waveguide has an arcuate inner surface that is complementary with an arcuate outer surface of the diaphragm and extends along a portion of the arcuate outer surface of the diaphragm. ## Claims ### Claim 1 A loudspeaker comprising: a diaphragm; a basket; an electro-magnetic motor supported by the basket and coupled to the diaphragm for driving motion of the diaphragm relative to the basket along a motion axis; a surround coupling an outer peripheral edge of the diaphragm to the basket; and a waveguide coupled to the basket and surrounding the diaphragm, wherein the waveguide has an arcuate inner surface that is complementary with an arcuate outer surface of the diaphragm and extends along a portion of the arcuate outer surface of the diaphragm, wherein the arcuate inner surface of the waveguide extends along approximately 5 percent to approximately 40 percent of the outer surface of the diaphragm. ### Claim 2 (depends on 1) The loudspeaker of claim 1, wherein the waveguide further comprises an outer surface that extends beyond the outer peripheral edge of the diaphragm. ### Claim 3 (depends on 1) The loudspeaker of claim 1, wherein the waveguide overhangs the surround. ### Claim 4 (depends on 3) The loudspeaker of claim 3, wherein a core of the waveguide overhangs the surround, the core having a height as measured from the outer surface of the basket in a direction parallel with the motion axis that is equal to approximately 35 percent to approximately 85 percent of a height of the diaphragm as measured from the outer surface of the basket in the axial direction. ### Claim 5 (depends on 1) The loudspeaker of claim 1, wherein the surround is visually obstructed by the waveguide from a front of the loudspeaker, and wherein the loudspeaker comprises a gap between the surround and a core of the waveguide. ### Claim 6 (depends on 1) The loudspeaker of claim 1, wherein the arcuate inner surface of the waveguide is separated from the arcuate outer surface of the diaphragm by a distance of approximately 0.25 millimeters (mm) to approximately 0.75 mm when the diaphragm is in its rest position. ### Claim 7 (depends on 1) The loudspeaker of claim 1, wherein the arcuate inner surface of the waveguide extends along only a portion of the outer surface of the diaphragm such that a distinct portion of the outer surface of the diaphragm is exposed through an opening in the waveguide. ### Claim 8 (depends on 1) The loudspeaker of claim 1, wherein the diaphragm comprises a dome-shaped radiating surface. ### Claim 9 (depends on 1) The loudspeaker of claim 1, wherein the loudspeaker comprises a high frequency (HF) driver. ### Claim 10 A high frequency (HF) driver comprising: a diaphragm; a basket; a surround coupling an outer peripheral edge of the diaphragm to the basket and protruding from an outer surface of the basket; and a waveguide coupled with the basket and surrounding the diaphragm, wherein the waveguide comprises: an arcuate inner surface that is complementary with an arcuate outer surface of the diaphragm and overlies a portion of the arcuate outer surface of the diaphragm, such that the outer peripheral edge of the diaphragm is visually obstructed by the waveguide from a front of the loudspeaker, wherein a core of the waveguide overhangs the surround, the core having a height as measured from the outer surface of the basket in a direction parallel with the motion axis that is equal to approximately 35 percent to approximately 85 percent of a height of the diaphragm as measured from the outer surface of the basket in the axial direction. ### Claim 11 (depends on 10) The HF driver of claim 10, wherein the waveguide overhangs the surround. ### Claim 12 (canceled) ### Claim 13 (depends on 10) The HF driver of claim 10, wherein the surround is visually obstructed by the waveguide from a front of the loudspeaker. ### Claim 14 (depends on 10) The HF driver of claim 10, wherein the arcuate inner surface of the waveguide is separated from the arcuate outer surface of the diaphragm by a distance of approximately 0.25 millimeters (mm) to approximately 0.75 mm. ### Claim 15 (depends on 10) The HF driver of claim 10, wherein the arcuate inner surface of the waveguide extends along approximately 5 percent to approximately 40 percent of the outer surface of the diaphragm. ### Claim 16 (depends on 10) The HF driver of claim 10, wherein the diaphragm comprises a dome-shaped radiating surface. ### Claim at position 17 17-20. (canceled) ### Claim 21 A loudspeaker comprising: a diaphragm; a basket; an electro-magnetic motor supported by the basket and coupled to the diaphragm for driving motion of the diaphragm relative to the basket along a motion axis; a surround coupling an outer peripheral edge of the diaphragm to the basket; and a waveguide coupled to the basket and surrounding the diaphragm, wherein the waveguide has an arcuate inner surface that is complementary with an arcuate outer surface of the diaphragm and extends along a portion of the arcuate outer surface of the diaphragm, wherein the loudspeaker comprises a gap between the surround and a core of the waveguide. ### Claim 22 (depends on 21) The loudspeaker of claim 21, wherein the core of the waveguide overhangs the surround and a gap exists between the core of the waveguide and the surround. ### Claim 23 (depends on 22) The loudspeaker of claim 22, wherein a core of the waveguide overhangs the surround, the core having a height as measured from the outer surface of the basket in a direction parallel with the motion axis that is equal to approximately 35 percent to approximately 85 percent of a height of the diaphragm as measured from the outer surface of the basket in the axial direction ### Claim 24 (depends on 21) The loudspeaker of claim 21, wherein the arcuate inner surface of the waveguide extends along only a portion of the outer surface of the diaphragm such that a distinct portion of the outer surface of the diaphragm is exposed through an opening in the waveguide.