EP3053357A1 - Dispositif de conversion électroacoustique ayant au moins deux haut-parleurs - Google Patents
Dispositif de conversion électroacoustique ayant au moins deux haut-parleursInfo
- Publication number
- EP3053357A1 EP3053357A1 EP14780818.2A EP14780818A EP3053357A1 EP 3053357 A1 EP3053357 A1 EP 3053357A1 EP 14780818 A EP14780818 A EP 14780818A EP 3053357 A1 EP3053357 A1 EP 3053357A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coil
- gap
- magnetic circuit
- magnet
- peripheral portion
- 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
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 9
- 230000005291 magnetic effect Effects 0.000 claims abstract description 103
- 230000005520 electrodynamics Effects 0.000 claims abstract description 6
- 230000005465 channeling Effects 0.000 claims abstract description 4
- 230000002093 peripheral effect Effects 0.000 claims description 41
- 239000012528 membrane Substances 0.000 claims description 22
- 239000007787 solid Substances 0.000 claims description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 10
- 230000004907 flux Effects 0.000 description 7
- 230000005294 ferromagnetic effect Effects 0.000 description 6
- 229910052742 iron Inorganic materials 0.000 description 5
- 239000003302 ferromagnetic material Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000005415 magnetization Effects 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 241000239290 Araneae Species 0.000 description 1
- 240000008415 Lactuca sativa Species 0.000 description 1
- 229910052779 Neodymium Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 210000000056 organ Anatomy 0.000 description 1
- 235000012045 salad Nutrition 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 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
- H04R9/063—Loudspeakers using a plurality of acoustic drivers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2209/00—Details of transducers of the moving-coil, moving-strip, or moving-wire type covered by H04R9/00 but not provided for in any of its subgroups
- H04R2209/026—Transducers having separately controllable opposing diaphragms, e.g. for ring-tone and voice
-
- 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
- H04R9/025—Magnetic circuit
Definitions
- Electroacoustic conversion device having at least two loudspeakers.
- the present invention relates to an electroacoustic conversion device comprising:
- a first electrodynamic loudspeaker comprising a first membrane and a first coil of electrical wire
- a magnetic circuit comprising at least one permanent magnet, the magnetic circuit defining a first gap adapted to receive the first coil, the magnetic circuit being adapted to channel closed magnetic field lines passing through the first gap, and
- At least one second electrodynamic loudspeaker comprising a second membrane and a second coil of electric wire distinct from the first membrane and the first coil.
- Such a device makes it possible to convert an electric signal received by the coils into sound waves emitted by the membranes.
- the magnetic circuit of each speaker comprises a permanent magnet, generally a toric, and ferromagnetic parts for channeling the magnetic field lines.
- the magnetic circuit defines an air gap receiving a coil, which is mechanically secured to the membrane.
- the membrane is mechanically connected to a frame in general by two seals also ensuring the guiding of the coil in the gap and the seal between the front and the back of the membrane.
- the magnetic circuit forms a loop extending mainly on the side opposite to the membrane with respect to a median plane of the gap.
- the magnetic circuit of each speaker channels the magnetic flux created by the permanent magnet, but also the flux generated by the coil.
- the coil has a high inductance value. This causes attenuation of the sound waves at the high frequencies produced by each speaker.
- the value of the inductance of each coil varies as a function of the position of the coil around its equilibrium point, resulting in nonlinearities between the excitation signal of the coil and the sound wave reproduced by the membrane. Since the magnetic circuit is asymmetrical, the channelization of the flux generated by the coil is favored for coil positions close to the bottom of the magnetic circuit. A force depending on the value of the current tends to push the coil towards the bottom. Moreover, the variation of current in the coil and the magnetic flux thus created cause a modulation of the main magnetic field of the permanent magnet, which also introduces nonlinearities.
- Nonlinearity conventionally means a non-linear relationship between the excitation signal of the coil and the amplitude of the sound wave generated by the membrane. These nonlinearities are complex, with hysteresis phenomena, and have a significant impact on the perceived quality of the loudspeaker.
- the coil being traversed by an electric current, it creates its own magnetic field which induces eddy currents, especially in the ferromagnetic part of the magnetic circuit located inside the coil. Such currents create Joule heat generation and are the cause of additional non-linearity in the response of the loudspeaker to the electrical signal.
- a first solution described in US-A-2004/0066263 consists in implementing a single speaker with two coils mechanically secured.
- the two coils are fixed on an elongate mandrel along the axis of the loudspeaker.
- the second coil is received in a second gap defined by the magnetic circuit.
- the device obtained is more linear than the conventional device, but it is complex to implement. Indeed, the guide of the mandrel by the seals of the membrane does not always prevent slight angular deviations of the mandrel relative to the axis of the speaker, which affects the operation of the device.
- a second solution described in document FR-A-2 892 886 consists in replacing the magnetic circuit previously described by a set of two permanent ring magnets, for example with radial magnetization, arranged substantially concentrically on either side of the air gap. .
- the magnets are held by non-ferromagnetic and non-electrically conductive parts.
- the eddy currents decrease and the device gains in linearity.
- such a set requires permanent magnets more powerful than in the classical case, all things being equal.
- the device obtained is therefore relatively expensive.
- An object of the invention is therefore to provide an electroacoustic conversion device whose linearity is improved, while avoiding excessive costs.
- the subject of the invention is an electroacoustic conversion device of the type described above, in which the same magnetic circuit defines a second gap in addition to the first air gap, the second gap being adapted to receive the second coil and being adapted for said magnetic field lines to pass through the second gap.
- the electroacoustic conversion device comprises one or more of the following characteristics, taken separately or in any technically possible combination:
- the first loudspeaker and the second loudspeaker are substantially structurally similar and oriented in opposite directions along the same axis
- the device comprises a source of electrical power adapted to supply the first coil and the second coil with the same electrical signal
- the magnetic circuit comprises:
- the central portion extending from the first gap to the second air gap, the central portion being adapted to channel a portion of each of the magnetic field lines between the inside of the first coil and the inside of the second coil, and
- peripheral portion extending from the first gap to the second air gap, the peripheral portion being adapted to channel another portion of each of the magnetic field lines between the outside of the first coil and the outside of the second reel,
- the magnetic circuit comprises at least one permanent magnet located in the peripheral part at a distance from the first air gap and the second air gap along the magnetic field lines, the magnet preferably being toroidal about an axis, and preferably magnetized axial,
- the magnetic circuit comprises:
- At least one first permanent magnet located in the peripheral portion of the first air gap, the first magnet preferably having a first face partially defining the first gap, and
- the second magnet located in the peripheral part near the second air gap, the second magnet preferably having a second face partly defining the second gap,
- the magnetic circuit comprises:
- the third magnet located in the central part near the first air gap, the third magnet preferably having a third face partially defining the first gap, and
- the fourth magnet located in the central part near the second air gap, the fourth magnet preferably having a fourth face partially defining the second gap,
- the central portion has a generally solid cylinder shape and the peripheral portion has a generally tubular shape, -
- the central portion has a generally tubular shape and the peripheral portion has a generally tubular shape.
- the central part is more axially extended than the peripheral part.
- the device comprises at least one magnetic circuit holding member extending substantially radially between the central portion and the peripheral portion, the member comprising one or more passages adapted to allow the air to circulate on one side of the organ; along the axis D towards the other side along the axis D;
- the central portion comprises one or more passages adapted to circulate the air radially relative to the axis (D);
- the peripheral portion comprises one or more passages adapted to allow the air to circulate radially with respect to the axis (D);
- the first coil and / or the second coil is (are) more axially extended than the first air gap and / or the second respectively;
- the first coil and / or the second coil is (are) less axially extended than the first air gap and / or the second respectively;
- the first coil and the second coil have a generally square shape in projection along their axes of displacement
- the magnetic circuit comprises several permanent magnets of different dimensions with respect to each other.
- FIG. 1 is a top view, in section along the axis of the speakers, schematically showing a section of a device according to the invention
- - Figure 2 is an identical view showing a first variant of the magnetic circuit of the device shown in Figure 1;
- FIG. 3 is an identical view showing a second variant of the magnetic circuit of the device represented in FIG. 1;
- FIG. 4 is an identical view showing a third variant of the magnetic circuit of the device represented in FIG. 1;
- FIG. 5 is an identical view showing a fourth variant of the magnetic circuit of the device shown in Figure 1.
- an electroacoustic conversion device 1 comprises a box 3, a first loudspeaker 5A, a second loudspeaker 5B, and a magnetic circuit 9 located in box 3 between the first loudspeaker. speaker and the second speaker.
- Device 1 also includes a power source electrical 1 1 own to electrically power the first speaker 5A and the second speaker 5B.
- the device 1 further comprises members 7, 8 for securing the magnetic circuit 9 with the body 3.
- the body 3 rests for example on a horizontal plane support (not shown), substantially parallel to the sectional plane of FIG.
- the box 3 is substantially parallelepipedic.
- the body 3 has a different shape, possibly more complex.
- the first loudspeaker 5A and the second loudspeaker 5B are advantageously substantially structurally similar and are for example oriented in opposite directions along the same axis D, for example horizontal.
- the first loudspeaker 5A and the second loudspeaker 5B are for example substantially symmetrical to one another with respect to a median plane P perpendicular to the axis D.
- the axis D is for example substantially horizontal in a position of use of the device 1.
- the first speaker 5A is for example axisymmetric about the axis D.
- the first speaker 5A comprises a first membrane 13A, a first coil 15A of electric wire, and 17A connecting members adapted to mechanically fasten the first coil 15A and the first membrane 13A.
- the first membrane 13A is for example spherical.
- the term "spherical" means that the first membrane 13A defines at rest substantially a portion of sphere.
- the first membrane 13A is fixed on the body 3 by means of a gasket 19A.
- the connecting members 17A are fixed by a seal 21A, for example on the magnetic circuit 9.
- the first membrane 13A and 17A connecting members are fixed on a frame, sometimes called “salad bowl", itself mechanically secured to the body 3.
- a frame advantageously has a generally conical shape.
- the first coil 15A is received in a first gap 23A defined by the magnetic circuit 9.
- the first coil 15A comprises turns 25A wound around the axis D.
- the first coil 15A is electrically connected to the power source 1 1.
- the first coil 15A is adapted to perform translation movements along the axis D in the first gap 23A around its mechanical equilibrium position.
- Inside of the first coil 15A is understood to mean the portion of space situated between the turns 25A in the vicinity of the axis D.
- the term “outside of the first coil 15A” the complementary space portion.
- the inside of the first coil 15A is substantially cylindrical with axis D.
- the seal 19A is for example substantially circular around the axis D and advantageously airtight.
- the seal 19A has for example a half-circle section.
- the seal 21A is for example a bellows seal known as the English "spider”.
- the seals 19A and 21A form a suspension of the first speaker 5A.
- the seals 19A and 21A are adapted to maintain the coil 15A in the first gap 23A and to guide the first coil 15A in its movements.
- the seals 19A and 21A are in particular adapted to limit rotational movements of the first coil 15A with respect to the first gap 23A around directions perpendicular to the axis D and translational movements of the first coil 15A with respect to the axis D in all directions perpendicular to the axis D.
- the second speaker 5B will not be described in detail because the structural characteristics of the first speaker 5A are transposed to the second speaker 5B.
- the elements of the second speaker 5B have references respectively corresponding to the similar elements of the first speaker 5A, the letter "A” being replaced by the letter "B" in the references.
- the second speaker 5B differs from the first speaker 5A only by its location and orientation in space.
- the power source 1 1 is for example adapted to deliver to the first coil 15A and the second coil 15B the same electrical signal.
- the magnetic circuit 9 is located between the first speaker 5A and the second speaker 5B along the axis D.
- the magnetic circuit 9 is advantageously substantially of revolution about the axis D.
- the magnetic circuit 9 comprises at least one permanent magnet 27 and is designed to channel closed magnetic field lines 29 (only two of which are shown in FIG. 1 for the sake of simplicity).
- the magnetic circuit 9 defines the first air gap 23A and the second gap 23B, both crossed by the magnetic field lines 29.
- the magnetic circuit 9 comprises a central portion 31 extending from the first gap 23A to the second air gap 23B along the axis D, and a peripheral portion 33 extending from the first air gap to the second gap and located radially around of the central part 29.
- the central portion 31 is adapted to channel a portion 35 of each of the magnetic field lines 29 between the inside of the first coil 15A and the inside of the second coil 15B.
- the central portion 31 advantageously has a generally cylindrical shape of axis D and is for example full.
- the central portion 31 is for example made of soft iron or other ferromagnetic material.
- ferromagnetic is meant a material which has a high magnetic permeability ⁇ ⁇ , for example greater than 100. Such a material is strongly magnetized under the effect of an external magnetic field such as that created by the magnet 27
- the ferromagnetic materials are, for example, alloys based on iron, nickel or cobalt.
- the peripheral portion 33 is adapted to channel another portion 37 of each of the magnetic field lines 29 between the outside of the first coil 15A and the outside of the second coil 15B.
- the peripheral portion 33 has a section "C" along a half plane P 'extending from the axis D.
- the "C” is open radially on the side of the axis D.
- the peripheral portion 33 incorporates the magnet 27, as well as two branches 33A and 33B extending between the magnet 27 and respectively the first air gap 23A and the second air gap 23B.
- the branches 33A and 33B are for example made of soft iron or other ferromagnetic material.
- the magnet 27 is of axis D and of rectangular section, for example.
- the magnet 27 is magnetized in the axial direction.
- the magnet 27 is for example located substantially equidistant from the first air gap 23A and the second air gap 23B along the field lines 29.
- the fastening member 7 extends for example radially between the peripheral portion 33 and the body 3.
- the fastening member 8 extends for example radially between the peripheral portion 33 and the central portion 31.
- the members 7, 8 are for example made of a plastic material or other non-ferromagnetic and non-magnetic material.
- non-magnetic is meant a material whose magnetic permeability ⁇ ⁇ is low, for example less than 10 and advantageously close to that of air which has a magnetic permeability substantially equal to 1.
- the magnet 27 permanently creates a magnetic field and in particular the field lines 29 which travel in closed loops the magnetic circuit 9.
- the portion 35 of the field lines 29 runs through the central portion 31 in a direction along the axis D from the second gap 23B to the gap 23A. Then the field lines 29 pass through the first gap 23A radially away. The field lines 29 then enter the peripheral portion 33 to form the portion 37. The portion 37 of the field lines 29 travels the peripheral portion 33 from the first air gap 23A to the second gap 23B. Finally, the field lines 29 crossing the second gap 23B.
- the field lines 29 are substantially radial in the first gap 23A and in the second gap 23B.
- the magnetic circuit 9 which channels the field lines 29 to the two air gaps 23A, 23B and minimizes the magnetic field lines looping outside the air gaps 23A, 23B, the dimensions required for the magnet 27 are minimized.
- the channeling of the field lines 29 by the magnetic circuit 9 makes it possible to have a maximum of magnetic flux inside the gaps 23A, 23B and a minimum outside. This makes it possible to optimize the magnet mass with respect to the value of the desired magnetic field in the air gaps 23A, 23B.
- the power source 1 1 circulates similar electrical currents in the first coil 15A and in the second coil 15B.
- the first coil 15A and the second coil 15B undergo Laplace forces which tend to move the first coil 15A and the second coil 15B along the axis D respectively in opposite directions.
- the first coil 15A and the second coil 15B vibrate along the axis D and their vibration movement is communicated respectively to the first membrane 13A and the second membrane 13B by the connecting members 17A, 17B.
- the first speaker 5A and the second speaker 5B broadcast similar acoustic waves.
- the first speaker 5A and the second speaker 5B vibratory movements have substantially the same intensity and in opposite directions.
- the body 3 is sensitive to the resultant of these vibratory movements.
- the body 3 is therefore very little affected by the movements of the first speaker 5A and the second speaker 5B. This minimizes the appearance in the box 3 of acoustic sources called "secondary" in relation to the speakers 5A, 5B.
- the seals 19A, 19B, 21A, 21B respectively suspend the first loudspeaker 5A and the second loudspeaker 5B and respectively guide the first coil 15A and the second coil 15B. Because the first coil 15A and the second coil 15B are not mechanically integral with each other, their guidance is individual and is therefore facilitated.
- the first coil 15A and the second coil 15B have an axial extension E less than the axial extension of the system with two integral coils described in the preamble of the present application.
- the first coil 15A and the second coil 15B are individually less sensitive, especially to rotational movements relative respectively to the first air gap 23A and the second gap 23B around directions perpendicular to the axis D ( movements tending to misalign the coils 15A, 15B).
- first coil 15A and the second coil 15B When the first coil 15A and the second coil 15B are traversed by currents, they create their own magnetic fields 39A, 39B variables, which produces eddy currents in the magnetic circuit 9.
- Eddy currents are only reduced in configurations with magnets in direct contact with air gaps because magnets have lower electrical conductivity than iron.
- the device 1 has an improved linearity, because the average value of the inductance of the coils is reduced, and the variation of these inductance values as a function of the position of the coils is also reduced. The cost of the magnet 27 is also reduced.
- the device when the speakers 5A and
- 5B are similar and powered by the same electrical signal, does not have, or has less, secondary acoustic sources.
- magnetic circuits 109, 209, 309, 409 constituting variants of the magnetic circuit 9 will now be described.
- the magnetic circuits 109, 209, 309, 409 are analogous to the magnetic circuit 9 shown in FIG. figure 1 . Similar elements bear the same references will not be described again. Only the differences will be described in detail.
- the magnetic circuit 109 does not include a single magnet 27, but a first magnet 127A and a second permanent magnet 127B.
- the magnetic circuit 109 comprises a peripheral portion 133 which no longer has a "C" -shaped section, but is tubular with a D-axis.
- the central portion 31 is also of tubular shape (as shown in Figures 3 and 4).
- the magnets 127A, 127B are located on an inner face of the peripheral portion 133.
- internal is meant “opposite the central portion”.
- the first magnet 127A is located on an axial end of the peripheral portion 133 located on the side of the speaker 5A (not shown in its entirety for simplicity).
- the first magnet 127A is for example ring-shaped with radial magnetization, advantageously with a rectangular section.
- the first magnet 127A advantageously has a face partially defining the first gap 23A.
- the second magnet 127B is structurally analogous to the first magnet 127A.
- the second magnet 127B is located on the other axial end of the peripheral portion 133 located on the side of the speaker 5B.
- the second magnet 127B advantageously has a face partially defining the second gap 23B.
- the advantage of the magnetic circuit 109 is that the sum of the masses of the magnets
- 127A, 127B is reduced with respect to the mass of the magnet 27 of the magnetic circuit 9.
- the positioning of the magnets 127A, 127B in direct contact or in proximity with the air gaps 23A, 23B makes it possible to minimize the leakage fields outside the air gaps 23A, 23B and thus to maximize the flux generated by the magnets 127A, 127B inside the air gaps 23A, 23B.
- the mass of the magnets 127A, 127B is further reduced compared with the circuit 9.
- peripheral portion 133 being tubular, is easy to manufacture.
- the magnetic circuit 209 differs from the magnetic circuit 109 shown in Figure 2 by its central portion which is not a solid cylinder.
- the magnetic circuit 209 comprises a central tubular portion 231 of axis D, a first magnet 131 A and a second magnet 131 B.
- the first magnet 131 A is located on an axial end of the central portion 231 located on the side of the speaker 5A (not shown in its entirety for simplicity).
- the first magnet 131 A is for example ring-shaped with radial magnetization, advantageously with a rectangular section.
- the first magnet 131 has a face partially defining the first gap 23A.
- close to an air gap is meant, for the purposes of this application, for example that the magnet is located within 2 mm of the air gap.
- the magnet is in direct contact with the gap. In other words, the magnet then partially defines the gap.
- the second magnet 131 B is structurally similar to the first magnet 131 A.
- the second magnet 131 B is located on the other axial end of the peripheral portion located on the side of the speaker 5B.
- the advantage of the magnetic circuit 209 is that the sum of the masses of the magnets
- 131 A, 131 B is reduced with respect to the mass of the magnet 27 of the magnetic circuit 9.
- positioning the magnets 131 A, 131 B in direct contact with the air gaps 23A, 23B makes it possible to minimize the leakage fields outside the air gaps 23A, 23B, and thus to maximize the flux generated by the magnets 131 A, 131 B within the air gaps 23A, 23B.
- the mass of the magnets 131A, 131B is further reduced compared with the circuit 9.
- the magnets 131 A, 131 B are poor conductors of electricity with respect to the ferromagnetic portions of the magnetic circuit 209.
- the electrical conductivity of the magnets 131 A, 131 B is about seven times lower than that of the iron.
- the eddy currents created by the first coil 15A and the second coil 15B in the magnetic circuit 209 are reduced compared to those created in the magnetic circuit 9 shown in FIG.
- the magnetic circuit 309 comprises both the magnets 127A, 127B and the magnets 131A, 131B described above and represented respectively in FIGS. 2 and 3.
- the central portion 231 and the peripheral portion 133 are tubular of axis D.
- the central portion 133 has radial passages 335 allowing air to flow from one side of the peripheral portion to the other radially.
- the central portion 231 has radial passages 337 allowing air to flow from one side of the central portion to the other radially.
- central portion 231 and the peripheral portion 133 are mechanically secured to one another by a securing member 308 having at least one axial passage 310.
- the axial passage 310 allows air to flow axially from a side of the securing member 308 to the other.
- the magnetic circuit 309 combines the advantages of the magnetic circuits 109 and 209. In addition, the magnetic circuit 309 has improved linearity thanks to the magnets 127A, 131A, on the one hand, and 127B, 131B, on the other hand, which define the first gap 23A and the second gap 23B.
- the radial passages 335, 337 and the axial passage improve the operation of the loudspeakers 5A, 5B.
- the central portion 231 has two extensions 333A, 333B along the axis D, so that the central portion 231 is more axially extended than the peripheral portion 133. This improves the efficiency of the device 1, because the symmetry of the variation of the inductance of the coils 15A, 15B as a function of the position of the coils 15A, 15B around their respective equilibrium positions is greater.
- the magnetic circuit 409 comprises a central portion 431 and a peripheral portion 433 respectively comprising several magnets permanent.
- the central portion 431 and the peripheral portion 433 are substantially free of any ferromagnetic material.
- the central part 431 and the peripheral part 433 do not have example of "C" -shaped sections like the peripheral part 31 shown in FIG.
- FIG. 5 represents only one half of the section of the magnetic circuit 409. The other half is deduced therefrom by symmetry with respect to the axis D.
- the central portion 431 comprises the magnets 131 A, 131 B already described, and magnets 435, 437, 439 extending between the magnets 131 A, 131 B.
- the peripheral portion 433 comprises the magnets 127A, 127B already described, and magnets 441, 443, 445 extending between the magnets 127A, 127B.
- the magnets 131A, 131B, 435, 437, 439, 127A, 127B, 441, 443, 445 are for example of ferrite or neodymium type.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1359670A FR3011708B1 (fr) | 2013-10-04 | 2013-10-04 | Dispositif de conversion electroacoustique ayant au moins deux haut-parleurs. |
PCT/EP2014/070868 WO2015049218A1 (fr) | 2013-10-04 | 2014-09-30 | Dispositif de conversion électroacoustique ayant au moins deux haut-parleurs |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3053357A1 true EP3053357A1 (fr) | 2016-08-10 |
EP3053357B1 EP3053357B1 (fr) | 2019-04-10 |
Family
ID=50489154
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP14780818.2A Active EP3053357B1 (fr) | 2013-10-04 | 2014-09-30 | Dispositif de conversion électroacoustique ayant au moins deux haut-parleurs |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3053357B1 (fr) |
FR (1) | FR3011708B1 (fr) |
WO (1) | WO2015049218A1 (fr) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112738696B (zh) * | 2020-12-28 | 2023-01-31 | 瑞声光电科技(常州)有限公司 | 扬声器 |
EP4161096A1 (fr) * | 2021-09-30 | 2023-04-05 | Harman Becker Automotive Systems GmbH | Haut-parleur |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5323466A (en) * | 1990-04-25 | 1994-06-21 | Ford Motor Company | Tandem transducer magnet structure |
EP1851993A1 (fr) * | 2005-02-25 | 2007-11-07 | Nokia Corporation | Capteur audio |
-
2013
- 2013-10-04 FR FR1359670A patent/FR3011708B1/fr not_active Expired - Fee Related
-
2014
- 2014-09-30 EP EP14780818.2A patent/EP3053357B1/fr active Active
- 2014-09-30 WO PCT/EP2014/070868 patent/WO2015049218A1/fr active Application Filing
Also Published As
Publication number | Publication date |
---|---|
FR3011708A1 (fr) | 2015-04-10 |
EP3053357B1 (fr) | 2019-04-10 |
WO2015049218A1 (fr) | 2015-04-09 |
FR3011708B1 (fr) | 2017-02-10 |
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