# US 2018/0324527 A1 · Diaphragm Assembly, Transducer and Method of Manufacture > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0324527 A1 - Document ID: US20180324527A1 - Status: Published application - Kind: A1 - Application number: 15/969,578 - Filed: 2018-05-02 - Published: 2018-11-08 - Earliest claimed: 2017-05-03 - Assignees: Genelec Oy - Applicants: Genelec Oy - Inventors: Jussi VÄISÄNEN - Web page: https://patentgrep.com/patent/US20180324527A1 ## CPC - H04R 7/127: {dome-shaped} - H04R 7/122: {comprising a plurality of sections or layers} - H04R 7/16: Mounting or tensioning of diaphragms or cones - H04R 31/003: {for diaphragms or their outer suspension} - H04R 9/04: Construction, mounting, or centering of coil - H04R 2207/021: Diaphragm extensions, not necessarily integrally formed, e.g. skirts, rims, flanges - H04R 2231/003: Manufacturing aspects of the outer suspension of loudspeaker or microphone diaphragms or of their connecting aspects to said diaphragms - H04R 2307/204: Material aspects of the outer suspension of loudspeaker diaphragms - 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 novel diaphragm assembly, transducer and manufacturing method is here in proposed making use of a diaphragm assembly including a diaphragm having a first diaphragm component and a second diaphragm component. Both diaphragm components extend between respective inner perimeter and outer rim. The outer rim of the first diaphragm component overlaps with and is attached to the second diaphragm component at an overlap section. A voice coil assembly is connected to the inner perimeter of the second diaphragm component. ## Claims ### Claim 1 A diaphragm assembly comprising: a diaphragm comprising: a first diaphragm component extending between an inner perimeter and an outer rim, and a second diaphragm component extending between an inner perimeter and an outer rim, wherein the outer rim of the first diaphragm component overlaps the second diaphragm component over an overlap section and wherein the second diaphragm component is attached to the first diaphragm component at the overlap section, and a voice coil assembly connected to the inner perimeter of the second diaphragm component of the diaphragm. ### Claim 2 (depends on 1) The diaphragm assembly according to claim 1, wherein the overlap section is annular. ### Claim 3 (depends on 1) The diaphragm assembly according to claim 1 wherein the diaphragm has a cross-sectional shape that extends away from the acoustic axis of the diaphragm assembly over a contour which comprises a component in the direction of the acoustic axis, when the cross-section is taken along the acoustic axis. ### Claim 4 (depends on 1) The diaphragm assembly according to claim 1, wherein the diaphragm is frusto-conical. ### Claim 5 (depends on 1) The diaphragm assembly according to claim 1, wherein first and second diaphragm components are annular. ### Claim 6 (depends on 1) The diaphragm assembly according to claim 1, wherein the overlap section extends over 5 to 20% of the radial extension of the second diaphragm component in a radial direction in respect to the acoustic axis of the diaphragm assembly. ### Claim 7 (depends on 1) The diaphragm assembly according to claim 1, wherein the first diaphragm component and the second diaphragm component are tangentially aligned. ### Claim 8 (depends on 1) The diaphragm assembly according to claim 1, wherein the first diaphragm component covers a connection between the second diaphragm component and the voice coil assembly when viewed from the outer side along the acoustic axis of the diaphragm assembly. ### Claim 9 (depends on 1) The diaphragm assembly according to claim 1, wherein diaphragm is constructed rigid enough for sound reproduction. ### Claim 10 (depends on 1) The diaphragm assembly according to claim 1, wherein the diaphragm assembly is constructed as a sub-assembly of a loudspeaker transducer. ### Claim 11 A loudspeaker transducer comprising a diaphragm assembly which comprises: a diaphragm comprising: a first diaphragm component extending between an inner perimeter and an outer rim, and a second diaphragm component extending between an inner perimeter and an outer rim, wherein the outer rim of the first diaphragm component overlaps the second diaphragm component over an overlap section and wherein the second diaphragm component is attached to the first diaphragm component at the overlap section, and a voice coil assembly connected to the inner perimeter of the second diaphragm component of the diaphragm. ### Claim 12 (depends on 11) The loudspeaker transducer according to claim 11, wherein the loudspeaker transducer comprises: a frame, and at least one suspension element which is configured to suspend the diaphragm to the frame of the loudspeaker transducer. ### Claim 13 (depends on 12) The loudspeaker transducer according to claim 12, wherein: the first diaphragm component or the second diaphragm component or both the first diaphragm component and the second diaphragm component has/have an axial rigidity or combined axial rigidity that is larger than the axial rigidity of the at least one suspension element. ### Claim 14 (depends on 12) The loudspeaker transducer according to claim 12 wherein an axial rigidity of: the first diaphragm component or the second diaphragm component or both the first diaphragm component and the second diaphragm component is of different order of magnitude compared to the axial rigidity of the at least one suspension element. ### Claim 15 (depends on 12) The loudspeaker transducer according to claim 12, wherein the axial travel of the at least one suspension element is at most half that of the diaphragm at mid-point along the radial extension of the outer suspension and diaphragm, respectively. ### Claim 16 (depends on 12) The loudspeaker transducer according to claim 12, wherein the at least one suspension element and the diaphragm are tangentially aligned. ### Claim 17 (depends on 12) The loudspeaker transducer according to claim 12, wherein the at least one suspension element is an outer suspension element connected to the outer rim of the second diaphragm component for suspending the diaphragm assembly to a surrounding frame of the loudspeaker transducer. ### Claim 18 (depends on 12) The loudspeaker transducer according to claim 12, wherein the at least one suspension element is an inner suspension element connected to the inner perimeter of the first diaphragm component for suspending the diaphragm assembly to a center frame element of the loudspeaker transducer. ### Claim 19 (depends on 18) The loudspeaker transducer according to claim 18, wherein the loudspeaker transducer is a compound transducer comprising: the diaphragm assembly as a lower frequency diaphragm assembly and a higher frequency diaphragm assembly housed in the center frame element of the loudspeaker transducer. ### Claim 20 (depends on 11) The loudspeaker transducer according to claim 11, wherein the first break-up mode frequency of the diaphragm is at the highest frequency of the pass band of the transducer or higher. ### Claim 21 A method for manufacturing the loudspeaker diaphragm assembly of a transducer, the method comprising: inserting a voice coil gauge inside a voice coil former, inserting the voice coil with the gauge to an air gap, attaching the voice coil to the inner perimeter of a second diaphragm component, removing the voice coil gauge, and attaching a first diaphragm component to the second diaphragm component at an overlap section. ### Claim 22 (depends on 21) The method according to claim 21, wherein the transducer comprises a diaphragm assembly which comprises: a diaphragm comprising: a first diaphragm component extending between an inner perimeter and an outer rim, and a second diaphragm component extending between an inner perimeter and an outer rim, wherein the outer rim of the first diaphragm component overlaps the second diaphragm component over an overlap section and wherein the second diaphragm component is attached to the first diaphragm component at the overlap section, and a voice coil assembly connected to the inner perimeter of the second diaphragm component of the diaphragm. ### Claim 23 (depends on 21) The method according to claim 21, wherein the attaching method is gluing.