EP3391664A1 - Membrane acoustique pour haut-parleur et haut-parleur correspondant - Google Patents
Membrane acoustique pour haut-parleur et haut-parleur correspondantInfo
- Publication number
- EP3391664A1 EP3391664A1 EP16812982.3A EP16812982A EP3391664A1 EP 3391664 A1 EP3391664 A1 EP 3391664A1 EP 16812982 A EP16812982 A EP 16812982A EP 3391664 A1 EP3391664 A1 EP 3391664A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- membrane
- annular
- fold
- central portion
- coil
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000012528 membrane Substances 0.000 title claims abstract description 103
- 230000002093 peripheral effect Effects 0.000 claims abstract description 7
- 230000008878 coupling Effects 0.000 claims abstract description 4
- 238000010168 coupling process Methods 0.000 claims abstract description 4
- 238000005859 coupling reaction Methods 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 23
- 230000001154 acute effect Effects 0.000 claims description 10
- 230000005284 excitation Effects 0.000 claims description 4
- PMOWTIHVNWZYFI-WAYWQWQTSA-N cis-2-coumaric acid Chemical compound OC(=O)\C=C/C1=CC=CC=C1O PMOWTIHVNWZYFI-WAYWQWQTSA-N 0.000 claims 1
- 238000004804 winding Methods 0.000 abstract description 7
- 239000000725 suspension Substances 0.000 description 5
- 229920000271 Kevlar® Polymers 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 239000004761 kevlar Substances 0.000 description 3
- 229920002799 BoPET Polymers 0.000 description 2
- 239000005041 Mylar™ Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000005236 sound signal Effects 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 1
- 229910052790 beryllium Inorganic materials 0.000 description 1
- ATBAMAFKBVZNFJ-UHFFFAOYSA-N beryllium atom Chemical compound [Be] ATBAMAFKBVZNFJ-UHFFFAOYSA-N 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/06—Loudspeakers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R7/00—Diaphragms for electromechanical transducers; Cones
- H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
- H04R7/12—Non-planar diaphragms or cones
- H04R7/14—Non-planar diaphragms or cones corrugated, pleated or ribbed
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/02—Details
- H04R9/04—Construction, mounting, or centering of coil
- H04R9/045—Mounting
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R7/00—Diaphragms for electromechanical transducers; Cones
- H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
- H04R7/12—Non-planar diaphragms or cones
Definitions
- the invention relates to the field of acoustic equipment. It relates to an acoustic speaker diaphragm, and a speaker equipped with such a membrane.
- the invention is more specifically a new form of acoustic membrane, particularly adapted for the realization of compact speaker and tweeter type.
- a loudspeaker comprises a fixed frame and a circular acoustic membrane (or diaphragm) connected to the frame and mechanically coupled to a coil via a cylindrical support.
- the winding is in particular mobile in the annular air gap of a magnetic system.
- the magnetic system is configured to generate a magnetic field in the gap.
- the winding is configured to receive electrical signals representative of the sound signal to be generated. On the basis of these received electrical signals and the magnetic field present in the gap, the coil moves in the air gap, thereby causing the displacement of the membrane.
- each element fitted to the loudspeaker is sized to allow the reproduction of sounds belonging to a predetermined audible frequency range.
- speakers configured for the return of low frequencies ( ⁇ 150Hz), intermediate frequencies (of the order of 150 to 2500Hz) and high frequencies (between 200Hz and 20KHz), these speakers are particularly known as “boomer” or "woofer”, “medium” and “tweeter” respectively.
- the membrane is generally in the form of a cone for woofers and mediums, and in the form of a rigid or flexible dome for mediums and tweeters, with a convexity turned towards the outside of the top loudspeaker.
- the Applicant has also proposed in the patent application published under the number EP1618761, a tweeter type speaker equipped with a dome membrane positioned in a manner reverse to what is generally achieved, that is to say that the concavity of the dome is turned towards the outside of the loudspeaker in the direction of the axis of movement of the coil or support.
- the cylindrical support of the coil is simply fixed on the convex face and half-height of the dome, which allows to uniformly put the entire surface of the membrane in motion.
- this inverted dome configuration does not allow the realization of compact speaker especially in the direction of travel of the coil. Indeed, to ensure maximum excursion of the coil and therefore the membrane, it is necessary to increase the depth of the frame in which are housed the magnetic system and the winding. Moreover, in order to reject the own resonance frequency of the membrane outside the audible frequency band, and in particular to push as high as possible its own resonance frequency, the membrane must necessarily be made of rigid material, especially in beryllium. In addition, this solution does not guarantee accurate positioning of the coil support relative to the center of the membrane. This solution also does not offer optimum geometrical rigidity of the coupling point with the winding support. This weakness has the effect of considerably reducing the frequency of the first mode of resonance and thus limiting the useful bandwidth of the tweeter.
- the present invention therefore aims to improve the solution presented above.
- the present invention is intended to provide an alternative acoustic membrane solution for the realization of compact speaker, especially in the direction of travel of the coil.
- the solution of the invention also aims to propose a solution that allows the use of flexible or rigid material for the membrane, as well as easy and precise positioning of the coil support on the membrane.
- the invention thus relates to a circular-shaped acoustic membrane having an upper surface and an opposite lower surface. This membrane is therefore intended to be coupled, at its lower surface, to a mobile winding via a support.
- the membrane has a concentric annular fold delimiting in the membrane, a circular central portion and an annular peripheral portion, the central portion having a concavity turned towards the upper surface of the membrane.
- the inner edge of the fold is carried by the lower surface and includes or forms an attachment surface for coupling the support of the coil.
- the acoustic membrane of the invention has a substantially M-shaped profile. More particularly, the acoustic membrane is provided with an annular fold substantially centered on the center of the membrane, as well as two portions of part and other of this annular fold.
- the portion of the membrane inside the annular fold is called the central portion and has a non-zero diameter and a concavity intended to be turned towards the outside of the speaker.
- the portion of the membrane outside the annular fold is called the annular portion and has a free outer edge for attachment to a chassis of a speaker generally via a suspension.
- this annular portion may also have a concavity intended to be turned towards the outside of the speaker.
- the inner edge of the fold is in particular intended to be in contact with the winding support.
- such a configuration facilitates a precise and correct positioning of the coil support on the membrane since this position is identified on the membrane by the fold thus formed.
- the particular positioning of the coil support on the membrane has a very favorable effect compared to the resonance phenomenon.
- the upper part of the coil support that is to say the part in contact with the membrane, participates in the appearance of unwanted deformations of the membrane may cause distortions of the audio signal.
- the geometry of the membrane of the invention makes it possible to constrain the upper part of the coil support to prevent non-coherent deformation of the membrane in a range of audible frequencies. given, and therefore increase the breaking frequency (or break-up frequency) of the membrane.
- centroid of the membrane is made closer to the bonding plane of the suspension. This configuration makes it possible to reduce the appearance of non-linear oscillation movements of the membrane surface and therefore the risk of tilts (usually referred to as "rocking mode") of the membrane likely to cause mechanical shocks. of the coil against the walls of the gap. It is then possible to attach the membrane to the chassis of the speaker via less rigid suspensions.
- the fold as well as the two portions of the membrane can be obtained by forming a single sheet of material.
- the fold can also be obtained by assembling the two distinct portions of identical or different materials.
- materials that are qualified as rigid in the field of loudspeakers of the tweeter or medium type for example aluminum or Kevlar TM, which have the particular advantage of having a high modulus of elasticity. , especially greater than 70 GPa.
- flexible materials for example paper or silk, having in particular a coefficient of elasticity of less than 1 GPa.
- the central portion and the annular portion are made of different materials.
- the method may consist in forming the central portion and the annular portion separately, and then assemble the peripheral edge of the central portion directly with the inner edge of the annular portion.
- the assembly can be obtained by a conventional bonding method.
- the annular fold thus formed generally has an opening angle substantially less than 180 °, for example between 130 ° and 150 °.
- the opening angle of the fold can be an acute angle.
- the fold may be such that the tangent to the lower surface of the central portion at a point on the edge of the fold and the tangent to the lower surface of the annular portion at this point form between they an acute angle.
- the opening angle of the fold may be such that:
- the main axis of symmetry of the membrane is in particular the radial axis of symmetry of the membrane and is generally substantially parallel to the direction of travel of the coil or to the main axis of the support.
- the various dimensions of the membrane are determined in particular according to the desired response curve and of the material or materials constituting the membrane.
- the value of the first angle and the value of the second angle may be identical or different, and preferably between 80 ° and 50 °;
- the ratio of the surfaces of the central portion and the annular portion may be between 0.8 and 1.6;
- the radius of curvature of the upper surface of the central portion is preferably substantially equal to the radius of curvature of the upper surface of the annular portion.
- the invention also relates to a loudspeaker, for example of the tweeter type, comprising:
- a mobile assembly relative to the chassis comprising:
- the acoustic membrane as defined above with a concavity turned towards the outside of the loudspeaker, the membrane being attached to the frame at its peripheral edge via a suspension;
- FIG. 1 is a perspective view in section of the acoustic membrane according to one embodiment of the invention.
- FIG. 2 is a side view and in section along the axis AA 'of the acoustic membrane of Figure 1;
- FIG. 3 is an enlargement of region V of FIG. 2;
- FIG. 4 is a perspective view in section of a loudspeaker equipped with an acoustic membrane according to one embodiment of the invention.
- the acoustic membrane 1 shown in FIGS. 1 to 3 generally has a substantially M-shaped profile.
- the acoustic membrane 1 is circular and in particular has a lower surface 10 and an opposite upper surface 11.
- an angular zone in the form of an annular fold 12 which defines in the membrane 1 a central portion 13 and an annular portion 14.
- the annular fold 12 is centered on the center of the circular membrane and the internal edge 120 of the fold 12 is in particular carried by the lower surface 10 of the membrane 1.
- the opening angle of the fold 12 is such that the central portion 13 and the annular portion 14 are curved, with a concavity turned in a direction opposite to that of the opening angle of the fold 12.
- the radius of curvature of the central portion is preferably close to that of the annular portion. However, these two radii of curvature can also be different to adapt the main resonance frequency of the central portion and that of the annular portion to the desired performance.
- This membrane may be obtained by forming a single sheet of material, monolayer or multilayer type, but may also result from an assembly, for example by gluing, two separate preformed pieces.
- the assembly makes it possible in particular to produce a membrane having the central and annular portions made of different materials, adapted to the desired response curve.
- the central portion may be of a material qualified as rigid and the annular portion may be of flexible material qualified. For example, it is possible to consider the following combinations: Aluminum-Silk, Aluminum-Mylar TM, Aluminum-Paper.
- this membrane 1 is intended to be coupled to a frame 2 at its peripheral edge 15, and to a cylindrical support 3 of excitation coil 4 at the level of the inner edge 120 of the annular fold 12. Thanks to the fold 12 formed in the membrane, the precise positioning of the support 3 on the membrane is facilitated.
- the main axis z of radial symmetry of the membrane 1 corresponds substantially to the main axis of the cylindrical support 3 and is substantially parallel to the direction of travel of the coil in operation.
- the membrane forms acute angles with respect to the coil support cylinder.
- the tangent to the lower surface 10 of the central portion 13 at a point on the edge of the fold 12 and the coil support at the same point form between them a first acute angle ai.
- the tangent to the lower surface 10 of the annular portion 14 at the same point and the coil support in this same point form between them a second angle has 2 acute.
- the two angles ai and a 2 may be equal or different and may be modulated depending on the desired frequency response. In general, for the same material, the sharper the angles, the higher the stiffness of the membrane increases and the higher the resonant frequency of the membrane itself.
- the geometry of the membrane and the material (s) used (s) have an influence on the acoustic and mechanical behavior of the membrane.
- the different dimensions of the membrane can be set depending in particular on the desired response curve and the material or materials used for the membrane.
- RI the radius of curvature of the central portion
- R2 the radius of curvature of the annular portion
- the membrane is made of Kevlar TM and is intended to be coupled with a coil support 20mm in diameter.
- the membrane preferably has the following dimensions:
- the membrane is Kevlar TM and is intended to be coupled with a 25mm diameter coil support.
- the membrane preferably has the following dimensions:
- the membrane is made of aluminum and is intended to be coupled with a coil support 20 mm in diameter.
- the membrane preferably has the following dimensions:
- the membrane has an aluminum central portion and an annular Mylar TM portion, and is intended to be coupled with a 25mm diameter coil support.
- the membrane preferably has the following dimensions:
- FIG. 4 a speaker equipped with the acoustic membrane described above.
- This loudspeaker is in particular a tweeter and therefore comprises the frame 2 forming a housing in which is disposed a magnetic circuit 5 configured to generate a magnetic field in an annular gap 50.
- the acoustic membrane provided with the annular fold 12 and the central and annular portions 13, 14.
- the peripheral edge 15 of this membrane 1 is attached to the frame 2 via a suspension 6.
- the acoustic membrane is arranged so that the concavities of the central and annular portions 13, 14 are directed towards the outside of the loudspeaker.
- the cylindrical support 3 of the excitation coil 4 is fixed to the inner edge 120 of the fold 12 of the diaphragm and the coil 4 is positioned in the gap 50. It is noted that this speaker can be relatively compact in the as it is not necessary to have a deep housing to ensure optimal excursion of the coil.
- the particular geometry of the invention therefore makes it possible to propose a more efficient acoustic membrane with respect to existing membranes.
- the solution of the invention makes it possible in particular:
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Multimedia (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1562261A FR3045264B1 (fr) | 2015-12-14 | 2015-12-14 | Membrane acoustique pour haut-parleur et haut-parleur correspondant |
PCT/FR2016/052962 WO2017103360A1 (fr) | 2015-12-14 | 2016-11-15 | Membrane acoustique pour haut-parleur et haut-parleur correspondant |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3391664A1 true EP3391664A1 (fr) | 2018-10-24 |
EP3391664B1 EP3391664B1 (fr) | 2020-01-15 |
Family
ID=55236768
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16812982.3A Active EP3391664B1 (fr) | 2015-12-14 | 2016-11-15 | Membrane acoustique pour haut-parleur et haut-parleur correspondant |
Country Status (5)
Country | Link |
---|---|
US (1) | US10820111B2 (fr) |
EP (1) | EP3391664B1 (fr) |
CN (1) | CN108370473B (fr) |
FR (1) | FR3045264B1 (fr) |
WO (1) | WO2017103360A1 (fr) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110620974B (zh) * | 2018-06-19 | 2022-01-18 | 宁波升亚电子有限公司 | 高音扬声器及其制造方法 |
TWM592200U (zh) * | 2019-11-01 | 2020-03-11 | 英屬開曼群島商康而富控股股份有限公司 | 用於微型揚聲器的振膜結構 |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4590332A (en) * | 1983-05-23 | 1986-05-20 | Pascal Delbuck | Phase coherent low frequency speaker |
US6490363B1 (en) * | 1999-10-13 | 2002-12-03 | Chun-I Liu | Structure of speaker |
DE10303030A1 (de) * | 2003-01-25 | 2004-08-05 | Norman Gerkinsmeyer | Treiber |
JP3989856B2 (ja) * | 2003-02-27 | 2007-10-10 | パイオニア株式会社 | スピーカ装置 |
FR2854021B1 (fr) | 2003-04-16 | 2006-03-31 | Focal Jmlab | Transducteur acoustiques en beryllium pur a radiation directe, a membrane de forme concave, pour applications audio notamment pour enceintes acoustiques |
CN1833464B (zh) * | 2003-08-08 | 2011-04-20 | Pss比利时股份有限公司 | 带有波状膜的扩音器 |
CN102761799A (zh) * | 2011-04-27 | 2012-10-31 | 鸿富锦精密工业(深圳)有限公司 | 耳机 |
US10694279B1 (en) * | 2018-12-21 | 2020-06-23 | Alpine Electronics, Inc. | Compact coaxial loudspeaker |
-
2015
- 2015-12-14 FR FR1562261A patent/FR3045264B1/fr not_active Expired - Fee Related
-
2016
- 2016-11-15 WO PCT/FR2016/052962 patent/WO2017103360A1/fr active Application Filing
- 2016-11-15 EP EP16812982.3A patent/EP3391664B1/fr active Active
- 2016-11-15 CN CN201680071294.4A patent/CN108370473B/zh active Active
- 2016-11-15 US US16/061,552 patent/US10820111B2/en active Active
Also Published As
Publication number | Publication date |
---|---|
US10820111B2 (en) | 2020-10-27 |
CN108370473B (zh) | 2020-07-31 |
US20200053474A1 (en) | 2020-02-13 |
WO2017103360A1 (fr) | 2017-06-22 |
FR3045264B1 (fr) | 2019-01-25 |
EP3391664B1 (fr) | 2020-01-15 |
CN108370473A (zh) | 2018-08-03 |
FR3045264A1 (fr) | 2017-06-16 |
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