# US 2018/0324529 A1 · Loudspeaker membrane and low-profile loudspeaker > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0324529 A1 - Document ID: US20180324529A1 - Status: Published application - Kind: A1 - Application number: 15/773,095 - Filed: 2016-11-02 - Published: 2018-11-08 - Earliest claimed: 2015-11-03 - Assignees: Fibona Acoustics Aps - Applicants: Fibona Acoustics APS - Inventors: MILAD KAHFIZADEH - Web page: https://patentgrep.com/patent/US20180324529A1 ## CPC - H04R 9/06: Loudspeakers - H04R 7/02: characterised by the construction - H04R 7/127: {dome-shaped} - H04R 7/18: at the periphery - H04R 9/043: {Inner suspension or damper, e.g. spider (outer suspension or surround H04R7/16)} - H04R 1/24: Structural combinations of separate transducers or of two parts of the same transducer and responsive respectively to two or more frequency ranges - H04R 9/063: {using a plurality of acoustic drivers (H04R1/24 and H04R1/403 take precedence)} - H04R 2400/11: Aspects regarding the frame of 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) ## Abstract An exemplary low-profile loudspeaker can be provided having an enclosure volume defined between a bottom and an outer wall with an outer periphery configured to suspend such membrane in the center, and excite the membrane at the periphery. An exemplary loudspeaker membrane can also be provided with a suspension path along which to suspend the membrane in a loudspeaker and with an excitation path along which to excite the membrane to produce sound when suspended and excited. The membrane can have an outward face for radiating sound and opposite an inward face for facing towards a volume of a loudspeaker, the membrane having a plurality of structure paths each single structure path substantially extending between the excitation path and the suspension path and along each individual structure path being non-flush structures to the otherwise flush outward face. ## Claims ### Claim 1 A low-profile wide range loudspeaker having an enclosure volume defined between a bottom section and an outer wall which includes a wall face, comprising: a magnet cup forming the bottom and arranged to support; a chassis configured to form (i) a centrally placed inner support with an inner support periphery facing the wall face of the outer wall and (ii) an opening between a periphery of the centrally placed inner support and the wall face and along the periphery of the centrally placed inner support a suspender configuration; and a substantially stiff membrane having an outer periphery, an aperture with an aperture periphery and a shape configured to essentially cover the opening wherein the membrane gas has (i) a suspension path to suspend the membrane via the suspender configuration from the chassis, (ii) an excitation path to excite the membrane to produce sound when suspended and excited, the membrane having an outward face for radiating sound and which is provided opposite to an inward face facing the bottom section, the membrane having a voice coil rigidly connected to the excitation path and extending towards and provided for a magnetic interaction with a pole piece provided in the magnet cup and to form a pole from a magnet in the magnet cup, wherein the membrane has the suspension path at the aperture periphery, and wherein the excitation path is an inwardly directed flange (60) provided at the outer periphery (30) of the membrane and arranged to move freely relatively to the pole piece as a function of a signal applied to the voice coil. ### Claim 2 (depends on 1) The low-profile wide range loudspeaker according to claim 1, wherein the membrane has a plurality of structure paths, each single one of the structure paths substantially extending between the excitation path and the suspension path and along each single one of structure paths being non-flush structures to the otherwise flush outward face, wherein the projections of the suspension path and the excitation path on the outward face are symmetric about a symmetry point or a symmetry line, and wherein the projection of the structure paths are asymmetric. ### Claim 3 (depends on 2) The low-profile wide range loudspeaker according to claim 2, wherein each single one of the structure paths has the shape of a curve section of one or more curves or approximations thereto and at least one of: a Fibonacci spiral, a golden spiral, an Archimedean spiral, a Euler spiral, a Fermat's spiral, a hyperbolic spiral, or a logarithmic spiral, or combinations thereof. ### Claim 4 (depends on 3) The low-profile wide range loudspeaker according to claim 3, wherein at least one of (i) the curve origin of the generic curve is placed at the symmetry point or (ii) the aperture periphery and the curve section is, from the curve origin, the first curve section that essentially extends between and without crossing the suspension path and the excitation path. ### Claim 5 (depends on 1) The low-profile wide range loudspeaker according to claim 1, wherein the membrane is annularly shaped with (i) an aperture, and with the excitation path at the outer periphery, (ii) the suspension path at the aperture periphery and (iii) a plurality of structure paths extending essentially from the aperture periphery to essentially the outer periphery, wherein each single one of the structure paths is formed as a curve section of a Fibonacci curve or a golden spiral curve, and wherein, along each single one of the structure paths, providing non-flush structures that are an embossing in the membrane. ### Claim 6 (depends on 2) The low-profile wide range loudspeaker according to claim 2, wherein at least one of the structure paths is a non-flush structures which is an embossing that alternates between outward and inward directions in the structure paths. ### Claim 7 (depends on 1) The low-profile wide range loudspeaker according to claim 1, wherein the loudspeaker membrane is made of a metal. ### Claim 8 (depends on 1) The low-profile wide range loudspeaker according to claim 1, wherein the loudspeaker membrane is a monolith. ### Claim 9 (depends on 1) The low-profile wide range loudspeaker according to claim 1, further comprising a tweeter covering a tweeter cavity in the central inner support and interactively connected to the suspender. ### Claim 10 (depends on 1) The low-profile wide range loudspeaker according to claim 1, wherein the pole piece is arranged in the magnetic cup towards the outer wall to form a gap between the outer wall and the pole piece, wherein the gap causes the voice coil to be excited and formed with a radially out-ward pole face and with a bottom pole face facing the magnetic cup decreasing extending from the outer wall towards the inner support. ### Claim 11 (depends on 1) The low-profile wide range loudspeaker according to claim 1, wherein the pole piece has a copper cap at the radially outward pole face for facing the voice coil. ### Claim 12 (depends on 1) The low-profile wide range loudspeaker according to claim 1, wherein a permanent magnet is connected to the pole piece only at the bottom pole face. ### Claim 13 (depends on 1) The low-profile wide range loudspeaker according to claim 1, further comprising a spider connecting the voice coil to the chassis. ### Claim 14 (depends on 1) The low profile wide range loudspeaker according to claim 1, wherein the membrane is suspended only by the suspender at the inner support periphery. ### Claim 15 (depends on 1) The low-profile wide range loudspeaker according to claim 1, further comprising a rear housing at least one of (i) essentially covering the bottom section of the chassis forming a rear chamber or (ii) configured with one or more electronics chambers and terminals. ### Claim 16 (depends on 15) The low-profile wide range loudspeaker according to claim 15, wherein the rear housing has one or more sound canals connecting at least one of the enclosure volume, the tweeter cavity or the rear chamber. ### Claim 17 (depends on 1) The low-profile wide range loudspeaker according to claim 1, wherein the loudspeaker is configured with an annularly shaped pole piece and a coaxial circular inner support supporting the membrane which is annularly shaped. ### Claim 18 (depends on 1) The low-profile wide range loudspeaker according to claim 1, wherein the loudspeaker has a height of less than 100 mm. ### Claim 19 (depends on 1) The low-profile wide-range loudspeaker according to claim 1, wherein the loudspeaker has a height of less than less than 75 mm, and includes a coaxial tweeter. ### Claim 20 A wide range loudspeaker membrane adapted to cover an opening of a low-profile loudspeaker, the membrane outwardly having an outward face for radiating sound and opposite and inwardly an inward face for facing towards a volume of a chassis of a loudspeaker, the membrane comprising: an outer periphery, an aperture with an aperture periphery defining a suspension path along which to suspend the membrane in the loudspeaker and with an excitation path at the outer periphery along which to excite the membrane to produce sound when suspended and excited, wherein the excitation path has a flange extending inwardly for rigidly connecting a voice coil to the excitation path, the membrane having a plurality of structure paths, each single one of the structure paths substantially extending between the excitation path and the suspension path, along each single one of the structure paths non-flush structures are provided to the otherwise flush outward face, wherein the projections of the suspension path and the excitation paths on the outward face are symmetric about a symmetry point or a symmetry line, and wherein the projection of the structure paths and each single structure path has the shape of a curve section of one or more curves or approximations thereto and at least one of: a Fibonacci spiral, a golden spiral, an Archimedean spiral, a Euler spiral, a Fermat's spiral, a hyperbolic spiral, or a logarithmic spiral, wherein at least one of (i) the curve origin of the generic curve is placed at the symmetry point or (ii) the of aperture periphery and the curve section is, from the curve origin, the curve section that essentially extends between and without crossing the suspension path and the excitation path, and wherein the distance from the aperture periphery or from the suspension path to the starting point of a single one of the structure paths is different and alternates. ### Claim 21 (depends on 20) The wide range loudspeaker membrane according to claim 20, wherein the curve sections are distributed by shifting the curve origin placed on the aperture periphery or the suspension path according to an rotation angle that is about 60 degrees. ### Claim 22 (depends on 20) The wide range loudspeaker membrane according to claim 20, wherein the outward face between suspension path and the excitation path is convex. ### Claim 23 (depends on 20) The wide range loudspeaker membrane according to of claim 20, wherein the membrane is annularly shaped with an aperture, with the excitation path at the outer periphery, with the suspension path at the aperture periphery and with a plurality of structure paths extending essentially from the aperture periphery to essentially the outer periphery, wherein each single one of the structure paths is formed as the curve section of a Fibonacci curve or a golden spiral curve, and along each single one of the structure paths, non-flush structures are provided that are an embossing in the membrane. ### Claim 24 (depends on 20) The wide range loudspeaker membrane according to claim 20, wherein at least one of the structure paths being non-flush structures is embossing that alternates between outward and inward directions in the structure paths. ### Claim 25 (depends on 20) The wide range loudspeaker membrane according to claim 20, wherein the membrane is made of a metal. ### Claim 26 (depends on 20) The wide range loudspeaker membrane according to claim 20, wherein the membrane is a monolith. ### Claim 27 (depends on 12) The low profile wide range loudspeaker according to claim 12, wherein the permanent magnet is a Neodymium type magnet. ### Claim 28 (depends on 13) The low profile wide range loudspeaker according to claim 13, wherein spider connects the voice coil to an outwardly extending part of the chassis.