# US 2025/0097644 A1 · Membrane unit for speaker device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2025/0097644 A1 - Document ID: US20250097644A1 - Status: Published application - Kind: A1 - Application number: 18/779,949 - Filed: 2024-07-22 - Published: 2025-03-20 - Earliest claimed: 2019-03-13 - Assignees: Mayht Holding B.V. - Applicants: Mayht Holding B.V. - Inventors: Timothy Ruben Scheek; Onno Hein Steenhuis - Web page: https://patentgrep.com/patent/US20250097644A1 ## CPC - H04R 7/06: comprising a plurality of sections or layers - H01F 27/325: {Coil bobbins (formers for coils in general H01F5/02)} - H04R 9/046: {Construction} - H04R 9/06: Loudspeakers - H04R 31/003: {for diaphragms or their outer suspension} - H05K 1/0213: {Electrical arrangements not otherwise provided for} - H05K 1/181: associated with surface mounted components - H05K 3/0011: {Working of insulating substrates or insulating layers} - H04R 9/025: {Magnetic circuit} - H05K 2201/1003: Non-printed inductor - 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) - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES - H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS ## Abstract Membrane unit for a speaker device, the membrane unit comprising a membrane and at least two coils. The respective longitudinal axes of the at least two coils are arranged in parallel along a main axis, a main surface being formed perpendicular to the main axis. The at least two coils are positioned adjacent to each other and mechanically connected to the membrane, the membrane being substantially flat and having a major surface parallel to the main surface. Wiring to the at least two coils is provided at least partly on a flat part of the membrane. ## Claims ### Claim 1 Membrane unit for a speaker device, the membrane unit comprising: a membrane, the membrane acting as a vibration diaphragm and being substantially flat and having a major surface; at least two coils each extending along a respective longitudinal axis, the respective longitudinal axis of the at least two coils being arranged in parallel and perpendicular to the major surface of the membrane, the at least two coils being positioned adjacent to each other and mechanically connected to the membrane; and wiring to the at least two coils, the wiring at least partly embedded in the membrane. ### Claim 2 (depends on 1) Membrane unit according to claim 1, wherein the wiring is embedded in a wiring support element. ### Claim 3 (depends on 2) Membrane unit according to claim 2, wherein the wiring support element is a printed circuit board, the printed circuit board forming the membrane. ### Claim 4 (depends on 3) Membrane unit according to claim 3, the printed circuit board being solely responsible for the conversion of mechanical vibration to sound. ### Claim 5 (depends on 1) Membrane unit according to claim 1, wherein the at least two coils are attached to a respective bobbin, the respective bobbins being attached to the membrane. ### Claim 6 (depends on 5) Membrane unit according to claim 5, wherein a part of the wiring to the at least two coils is provided on a surface of the respective bobbins. ### Claim 7 (depends on 5) Membrane unit according to claim 5, the surface of the respective bobbin being an inner surface of the respective bobbin. ### Claim 8 (depends on 5) Membrane unit according to claim 5, wherein the respective bobbins are hollow and arranged to receive a magnetic pole of a magnetic assembly. ### Claim 9 (depends on 5) Membrane unit according to claim 5, wherein the membrane comprises a wiring support element, the respective bobbins being integrally formed with the wiring support element. ### Claim 10 (depends on 1) Membrane unit according to claim 1, wherein the membrane unit further comprises a suspension element attached to the membrane, or to a peripheral edge thereof. ### Claim 11 (depends on 1) Membrane unit according to claim 1, wherein the membrane comprises two spaced apart membrane sections connected through a pliable/flexible bridge section, wherein each of the membrane sections comprises a coil of the at least two coils. ### Claim 12 (depends on 11) Membrane unit according to claim 11, wherein the bridge section has a width (W1) and comprises multiple bridge section elements, the total width of the bridge section elements being equal to the width (W1). ### Claim 13 (depends on 12) Membrane unit according to claim 12, wherein at least some of the multiple bridge section elements are parallel to one another. ### Claim 14 (depends on 11) Membrane unit according to claim 11, wherein the two membrane sections and the bridge section form a single, foldable printed circuit board. ### Claim 15 A speaker device comprising a membrane unit, the membrane unit comprising: a membrane, the membrane acting as a vibration diaphragm and being substantially flat and having a major surface; at least two coils each extending along a respective longitudinal axis, the respective longitudinal axis of the at least two coils being arranged in parallel and perpendicular to the major surface of the membrane, the at least two coils being positioned adjacent to each other and mechanically connected to the membrane; and wiring to the at least two coils, the wiring at least partly embedded in the membrane. ### Claim 16 (depends on 15) The speaker device according to claim 15, wherein: the wiring to the at least two coils is embedded in a wiring support element; and the wiring support element is a printed circuit board, the printed circuit board forming the membrane. ### Claim 17 (depends on 15) The speaker device according to claim 15, comprising a printed circuit board forming the membrane, wherein the at least two coils are attached to a respective bobbin, the respective bobbins integrally formed with the printed circuit board. ### Claim 18 (depends on 15) The speaker device according to claim 15, comprising a magnetic assembly, wherein: the at least two coils are configured for magnetic engagement with the magnetic assembly; the at least two coils are attached to a respective bobbin, each respective bobbin being: directly attached to the membrane; and hollow and arranged to receive a magnetic pole of the magnetic assembly. ### Claim 19 (depends on 15) The speaker device according to claim 15, wherein the membrane comprises two spaced apart membrane sections connected through a pliable/flexible bridge section, wherein: each of the membrane sections comprises a coil of the at least two coils; and the membrane is folded along the bridge section with the two membrane sections parallel to one another with the at least two coils arranged between the two membrane sections. ### Claim 20 (depends on 15) The speaker device according to claim 15, wherein the membrane is a printed circuit board and the speaker device comprises input and output signal connections routed to the at least two coils via the wiring to the at least two coils.