EP4179736A1 - Electrodynamic transducer - Google Patents

Electrodynamic transducer

Info

Publication number
EP4179736A1
EP4179736A1 EP21743157.6A EP21743157A EP4179736A1 EP 4179736 A1 EP4179736 A1 EP 4179736A1 EP 21743157 A EP21743157 A EP 21743157A EP 4179736 A1 EP4179736 A1 EP 4179736A1
Authority
EP
European Patent Office
Prior art keywords
suspension means
transducer
springs
elementary
transducer according
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
Application number
EP21743157.6A
Other languages
German (de)
French (fr)
Other versions
EP4179736B1 (en
Inventor
Jean-Philippe Thome
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Treves Audio SAS
Original Assignee
Treves Audio SAS
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Treves Audio SAS filed Critical Treves Audio SAS
Publication of EP4179736A1 publication Critical patent/EP4179736A1/en
Application granted granted Critical
Publication of EP4179736B1 publication Critical patent/EP4179736B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • H04R9/02—Details
    • H04R9/04—Construction, mounting, or centering of coil
    • H04R9/041—Centering
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein
    • H04R1/025—Arrangements for fixing loudspeaker transducers, e.g. in a box, furniture
    • 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
    • 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
    • H04R9/041—Centering
    • H04R9/043—Inner suspension or damper, e.g. spider
    • 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
    • H04R2400/00—Loudspeakers
    • H04R2400/07—Suspension between moving magnetic core and housing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2400/00—Loudspeakers
    • H04R2400/11—Aspects regarding the frame of loudspeaker transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2440/00—Bending wave transducers covered by H04R, not provided for in its groups
    • H04R2440/01—Acoustic transducers using travelling bending waves to generate or detect sound
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
    • H04R2499/10—General applications
    • H04R2499/13—Acoustic transducers and sound field adaptation in vehicles

Definitions

  • the present invention relates to an electrodynamic transducer and a trim element of a motor vehicle compartment provided with such a transducer.
  • transduction is the operation making it possible to transform one physical quantity into another, this by means of a transducer which transforms the energy received in a given form, for example electrical energy, into usable energy in a form different, for example acoustic.
  • a trim element as mentioned above is, for example, a window pillar cabinet, a luggage compartment cover shelf, a carpet under the seat, a headliner, a door trim, etc. .
  • an electrodynamic transducer comprises:
  • a fixed part comprising a frame provided with a hollow mandrel fitting into a cylindrical envelope extending along an axis of symmetry, a coil being wound around said mandrel,
  • a moving part comprising a magnetic mass
  • said mass comprising: o a metallic cylindrical part defining a housing, o an annular permanent magnet in the form of a hollow cylinder fixed in said cylindrical part and surrounding said coil, o a cylindrical soft iron core fixed to said cylindrical part and fitting inside said mandrel, said coil being positioned in the air gap provided between said magnet and said core, said magnetic mass being connected to said frame by a first and a second axially offset suspension means, said means allowing movement of said mass in axial translation with respect to said chassis.
  • the movement of the magnetic mass should only be an axial translation movement, i.e. along the axis of symmetry mentioned above.
  • the invention proposes to remedy by proposing a transducer in which the displacement of the magnetic mass can only take place in axial translation.
  • the subject of the invention is an electrodynamic transducer comprising:
  • a fixed part comprising a frame provided with a hollow mandrel fitting into a cylindrical envelope extending along an axis of symmetry, a coil being wound around said mandrel,
  • a moving part comprising a magnetic mass
  • said mass comprising: o a metallic cylindrical part defining a housing, o an annular permanent magnet in the form of a hollow cylinder fixed in said cylindrical part and surrounding said coil, o a cylindrical soft iron core fixed to said cylindrical part and fitting inside said mandrel, said coil being positioned in the air gap provided between said magnet and said core, said magnetic mass being connected to said frame by a first and a second axially offset suspension means, said means allowing movement of said mass in axial translation relative to said chassis, said transducer further having the following characteristics:
  • each of said suspension means has a plurality of elementary springs, said springs being arranged in rotational symmetry about said axis between an internal part of said means which is integral with said magnetic mass and an external part of said means which is integral with said frame, said parts being movable relative to each other in axial translation by means of said elementary springs,
  • said elementary springs comprise an internal segment and an external segment, said segments extending according to two concentric circular arcs around said axis and being separated by a slot, said segments having two respective first ends connected by a connecting bridge, said segment internal part being fixed by a second end to said internal part and said external segment having another second end fixed to said external part, the path going from said second ends to said connecting bridge defining a direction of orientation of said elementary springs,
  • axial rotation means a rotation around the axis of symmetry mentioned above.
  • radially is also taken with reference to the aforementioned axis of symmetry.
  • the invention makes it possible, by the use of suspension means thus arranged, to have a suspended magnetic mass that can only move in axial translation.
  • the impossibility of movement of the magnetic mass in axial rotation guarantees optimal reproduction of the sound signal.
  • the subject of the invention is a trim element for a motor vehicle compartment provided with such a transducer.
  • Figure 1 is a schematic sectional view according to one embodiment of a transducer in pre-assembly configuration on a wall
  • Figure 2 is an axial view of a suspension means according to one embodiment
  • Figure 3 is a perspective view of two suspension means similar to that of Figure 2 as positioned in the transducer of Figure 1,
  • Figure 4 is a schematic axial view, according to one embodiment, of a stiffness adjustment ring of a suspension means in interaction with the suspension means of Figures 2 and 3,
  • Figure 5 is a schematic sectional view of the transducer of Figure 1 provided with an adjustment ring as shown in Figure 4,
  • Figure 6 is a principle view in partial perspective of an adjustment ring interacting with an elementary spring according to one embodiment
  • Figure 7 is a schematic perspective view of an elementary spring according to one embodiment
  • Figure 8 is similar to Figure 1, the transducer being mounted on the wall.
  • an electrodynamic transducer 1 comprising:
  • a fixed part comprising a frame 5 - in particular in molded plastic material - provided with a hollow mandrel 8 fitting into a cylindrical envelope extending along an axis of symmetry A, a coil 9 being wound around said mandrel,
  • a movable part comprising a magnetic mass 11, said mass comprising: o a cylindrical metal part 14 - for example soft iron - defining a housing, o an annular permanent magnet 13 in the form of a hollow cylinder fixed in said cylindrical part and surrounding said coil, o a cylindrical soft iron core 12 fixed to said cylindrical part and fitting inside said mandrel, said coil being positioned in the air gap 10 provided between said magnet and said core, said magnetic mass being connected to said chassis by a first 19a and a second 19b suspension means 19 axially offset, said means allowing movement of said mass in axial translation relative to said frame, said transducer further having the following characteristics: • each of said suspension means has a plurality of elementary springs 25, said springs being arranged in rotational symmetry around said axis between an internal part 22 of said means integral with said mass and an external part 24 of said means integral with said frame, said parts being movable relative to each other in axial translation by means of said elementary springs,
  • said elementary springs comprise an inner segment 26 and an outer segment 27, said segments extending along two concentric circular arcs around said axis and being separated by a slot 28, said segments having two respective first ends 30,31 connected by a connecting bridge 29, said internal segment being secured by a second end 32 to said internal part and said external segment having another second end 33 secured to said external part, the path going from said second ends to said connecting bridge defining a direction of orientation S1, S2 of said elementary springs,
  • At least one and in particular the two internal 22 and external 24 parts are annular.
  • suspension means 19a, 19b In order to achieve an isostatic system, provision should be made for the suspension means 19a, 19b to be provided with at least three elementary springs 25 - said means being in particular provided with four of said springs according to the embodiment shown.
  • Figure 1 is a representation of a transducer 1, in accordance with one embodiment of the invention, in position on a wall 2.
  • the fixing on the wall 2 of the transducer 1 is carried out, preferably removable, using a base 3.
  • the base 3 is itself secured to the wall 2 in a permanent or removable manner.
  • the base 3 is provided with at least one fixing member, for example an adhesive zone, a magnet, holes for passing screws or spikes.
  • the base 3 comprises a means for fixing the transducer.
  • the fastening means is a clip.
  • transducer 1 extends above wall 2.
  • the base 3 is housed in a countersink made in the wall 2, so that when the transducer 1 is in position on said wall, its upper face is substantially coplanar with said wall.
  • the transducer 1 is not visible, being incorporated in the wall 2.
  • the frame 5 is made of rigid material insensitive to the magnetic field, being in particular, as specified before, made of molded plastic material.
  • the frame 5 is equipped with a fixing part 6 on the base 3.
  • This part 6 is of complementary configuration to the relief 4 of the base 3. In this case, it is cylindrical and provided with an internal thread 42.
  • the frame 5 has a general U-shape in section. It can be of another shape provided that it includes a housing for receiving the magnetic mass 11.
  • This housing comprises a flat bottom 7 equipped with a hollow cylindrical mandrel 8 with a circular base.
  • the mandrel 8 is in a central position on the bottom 7 and it is fixed on the latter; advantageously it is integral with the bottom 7, for example by molding or machining; alternatively, it is glued or welded.
  • a coil 9 is wound around the mandrel 8.
  • This coil 9 is formed from a metal wire, in particular copper.
  • the mandrel 8 equipped with the coil 9 is inserted in an air gap 10 of complementary shape formed in a magnetic mass 11 in two parts.
  • a first part is a cylindrical soft iron core 12 with a circular base of dimensions adapted to be inserted in a movable manner, with minimal clearance, in the slot of the mandrel 8.
  • the length of the core 12 is greater than the length of the mandrel 8, so that part of said core 12 extends above the open end of the mandrel 8, as can be seen from figures 1 and 8.
  • the cylindrical part 14 has dimensions and a shape such that it holds the magnet 13 while covering the core 12.
  • the magnet 13 is a permanent magnet composed for example of an alloy of neodymium, iron and boron.
  • the core 12, the cylindrical part 14 and the magnet 13 are coaxial and concentric. Their common axis A is aligned with the center of the bottom 7.
  • the axis A is materialized by the central longitudinal axis of a cylindrical orifice 15 called decompression orifice extending over the height of the core 12 and crossing the portion of the cylindrical piece 14 located above said core.
  • the outer wall of the core 12 and the inner wall of the lumen of the magnet 13 and of the cylindrical part 14 define the air gap 10.
  • the coil 9 is inserted into the air gap 10 between the parts 12 , 13, 14 constituting the magnetic mass 11, this with minimal play.
  • the magnetic mass 11, formed by the core 12 and the magnet 13 embedded in the cylindrical part 14, is generally disc-shaped with a thickness close to the height of the frame 5.
  • the parts 12, 13, 14 constituting the magnetic mass 11 are held together by known means, for example by screwing, gluing, welding.
  • the parts 12, 14 are made in one piece and obtained by machining or molding, the magnet 13 being inserted by force into a housing provided in the part 14.
  • the outer walls 16 of the cylindrical part 14 and the inner walls 17 of the frame 5 are parallel to each other but without contact, thus leaving between them a clearance 18.
  • the magnetic mass 11 is movable relative to the frame 5, thanks to the clearance 18 and to the air gap 10, the mandrel 8 not being fixed to the core 12 and to the coil 9.
  • the magnetic mass 11 is suspended in the frame 5.
  • Suspension means 19a, 19b keep the magnetic mass 11 in suspension in the frame 5.
  • the suspension means 19a, 19b are parallel to each other. They are arranged parallel to the bottom 7 of the frame 5, therefore perpendicular to the axis A when the magnetic mass 11 is in place in said frame.
  • the suspension means 19a, 19b are held, on the one hand, on the internal wall 17 of the frame 5 and, on the other hand, on the cylindrical part 14.
  • suspension means 19a, 19b pass through the external wall 16 and extend as far as the annular magnet 13.
  • the suspension means 19a19b are fixed to the frame 5 and to the magnetic mass 11 by means known per se, here by screws 20 being introduced into orifices 51 .
  • the suspension means 19a, 19b thus extend through the entire clearance 18 and they maintain the magnetic mass 11 in suspension with respect to the frame 5, authorizing translational movements, alternately in one direction and in the other, with variable amplitudes, of said magnetic mass relative to the chuck 8, in a direction coinciding with the axis A, as illustrated by the double arrow F in Figure 8.
  • an elementary spring 25 is surrounded by an external U-shaped slot 50 extending between its two second ends 32,33 passing through the connecting bridge 29.
  • the internal slot 28 of an elementary spring 25 extends between its two second ends 32,33 to open into the external slot 50 of the adjoining elementary spring 25 which is arranged opposite the direction of orientation S1, S2 of said springs.
  • the outer segment 27 is connected to the outer part 24 only by its second end 33,
  • the second ends 32,33 are located radially plumb with each other.
  • the segments 26,27 then have the same angular extent along the axis A, and therefore a similar length, allowing an axial translation not accompanied by an axial rotation.
  • the suspension means 19a, 19b are in the general shape of flattened circular rings defining a slot 21 and generally falling within two planes perpendicular to the axis of symmetry A.
  • the suspension means 19a, 19b are located respectively at each of the ends of the magnet 13, so as to maximize the gap between them and to avoid, in side view, any parasitic movement of rotation not axial of the magnetic mass 11 when the transducer 1 is in use.
  • the suspension means 19a, 19b come from two cut metal plates.
  • the suspension means 19a, 19b are made of molded plastic material, said material possibly being filled with fibers. In particular, they can be integrated into a single molded part so as to form a one-piece assembly. According to another embodiment, the suspension means 19a, 19b are made from cut cardboard.
  • the suspension means 19a, 19b are made of composite material.
  • a protective cover 38 caps the active part of transducer 1 .
  • the suspension means 19a, 19b being in particular made of molded plastic material, the segments 26,27 have a thickness 40 which becomes thinner as one moves towards the bridge 29.
  • the suspension means 19a, 19b being in particular made of molded plastic material, the segments 26,27 have a width 39 which becomes thinner as one moves towards the bridge 29.
  • the elementary springs 25 are given a progressive stiffness making it possible to transmit with maximum efficiency the force of inertia of the magnetic mass 11 on the wall 2 to be vibrated.
  • the transducer 1 further comprises a ring 35 for adjusting the stiffness of at least one suspension means 19a, 19b, said ring being rotatably mounted on the magnetic mass 11, said ring comprising a plurality of sliders 37 resting on the elementary springs 25 to define the length of the lever arm of the segments 26,27 and the resulting stiffness.
  • a ring 35 made of a rigid material, for example a polymer, is used.
  • the ring 35 is provided, on its face 36 oriented in the direction of the suspension means 19a, 19b, with several sliders 37 each resting on a respective spring 25.
  • the sliders 37 are introduced by a sliding projection into the slots 28, 50.
  • the elementary springs 25 are stiffened more or less, by adjusting the length of the lever arm of each of the segments 26, 27; to adjust the position of sliders 37, simply turn ring 35 clockwise or counterclockwise.
  • trim element of a motor vehicle compartment provided with at least one transducer 1 as described above is described, said element comprising:

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
  • Vibration Prevention Devices (AREA)

Abstract

The invention relates to an electrodynamic transducer (1) comprising a magnetic mass (11) connected to the frame (5) via first and second axially offset suspension means (19), said means allowing translational displacement of the mass with respect to the frame, the suspension means having a plurality of basic springs, the direction of orientation of the basic springs of the first suspension means being opposite that of the basic springs of the second suspension means, such that each of the suspension means blocks axial rotation of the other suspension means.

Description

DESCRIPTION DESCRIPTION
Titre : TRANSDUCTEUR ELECTRODYNAMIQUE Title: ELECTRODYNAMIC TRANSDUCER
La présente invention concerne un transducteur électrodynamique et un élément d’habillage d’un compartiment de véhicule automobile pourvu d’un tel transducteur. The present invention relates to an electrodynamic transducer and a trim element of a motor vehicle compartment provided with such a transducer.
Pour mémoire, la transduction est l’opération permettant de transformer une grandeur physique en une autre, ceci au moyen d’un transducteur qui transforme l’énergie reçue sous une forme donnée, par exemple une énergie électrique, en une énergie utilisable sous une forme différente, par exemple acoustique. For the record, transduction is the operation making it possible to transform one physical quantity into another, this by means of a transducer which transforms the energy received in a given form, for example electrical energy, into usable energy in a form different, for example acoustic.
Dans le cadre de l’invention, il s’agit de transformer un signal électrique en un signal acoustique en utilisant comme surface de rayonnement la paroi de l’objet sur lequel est fixé le transducteur. In the context of the invention, it is a question of transforming an electrical signal into an acoustic signal by using as the radiation surface the wall of the object on which the transducer is fixed.
Un élément d’habillage tel que mentionné ci-dessus est par exemple une ébénisterie de montant de baie, une tablette de recouvrement d’un compartiment à bagages, un tapis sous siège, une garniture de pavillon, une garniture de porte, etc... A trim element as mentioned above is, for example, a window pillar cabinet, a luggage compartment cover shelf, a carpet under the seat, a headliner, a door trim, etc. .
De façon connue, un transducteur électrodynamique comprend : In known manner, an electrodynamic transducer comprises:
• une partie fixe comprenant un châssis pourvu d’un mandrin creux s’inscrivant dans une enveloppe cylindrique s’étendant selon un axe de symétrie, une bobine étant enroulée autour dudit mandrin, • a fixed part comprising a frame provided with a hollow mandrel fitting into a cylindrical envelope extending along an axis of symmetry, a coil being wound around said mandrel,
• une partie mobile comprenant une masse magnétique, ladite masse comprenant : o une pièce cylindrique métallique définissant un logement, o un aimant permanent annulaire en forme de cylindre creux fixé dans ladite pièce cylindrique et entourant ladite bobine, o un noyau cylindrique en fer doux fixé sur ladite pièce cylindrique et s’insérant à l’intérieur dudit mandrin, ladite bobine étant positionnée dans l’entrefer ménagé entre ledit aimant et ledit noyau, ladite masse magnétique étant reliée audit châssis par un premier et un deuxième moyens de suspension axialement décalés, lesdits moyens permettant un débattement de ladite masse en translation axiale par rapport audit châssis. • a moving part comprising a magnetic mass, said mass comprising: o a metallic cylindrical part defining a housing, o an annular permanent magnet in the form of a hollow cylinder fixed in said cylindrical part and surrounding said coil, o a cylindrical soft iron core fixed to said cylindrical part and fitting inside said mandrel, said coil being positioned in the air gap provided between said magnet and said core, said magnetic mass being connected to said frame by a first and a second axially offset suspension means, said means allowing movement of said mass in axial translation with respect to said chassis.
Pour que le signal acoustique corresponde fidèlement au signal électrique reçu, il convient que le mouvement de la masse magnétique soit uniquement un mouvement de translation axiale, c'est à dire selon l’axe de symétrie sus évoqué. For the acoustic signal to correspond faithfully to the electrical signal received, the movement of the magnetic mass should only be an axial translation movement, i.e. along the axis of symmetry mentioned above.
Or, il s’avère que la translation axiale de la masse magnétique peut s’accompagner de mouvements de rotation parasites qui génèrent une distorsion du signal acoustique, d’où une perte de qualité dans sa restitution. However, it turns out that the axial translation of the magnetic mass can be accompanied by parasitic rotational movements which generate a distortion of the acoustic signal, resulting in a loss of quality in its restitution.
C’est à cet inconvénient que se propose de remédier l’invention en proposant un transducteur dont le déplacement de la masse magnétique ne peut se faire qu’en translation axiale. It is this drawback that the invention proposes to remedy by proposing a transducer in which the displacement of the magnetic mass can only take place in axial translation.
A cet effet, et selon un premier aspect, l’invention a pour objet un transducteur électrodynamique comprenant : To this end, and according to a first aspect, the subject of the invention is an electrodynamic transducer comprising:
• une partie fixe comprenant un châssis pourvu d’un mandrin creux s’inscrivant dans une enveloppe cylindrique s’étendant selon un axe de symétrie, une bobine étant enroulée autour dudit mandrin, • a fixed part comprising a frame provided with a hollow mandrel fitting into a cylindrical envelope extending along an axis of symmetry, a coil being wound around said mandrel,
• une partie mobile comprenant une masse magnétique, ladite masse comprenant : o une pièce cylindrique métallique définissant un logement, o un aimant permanent annulaire en forme de cylindre creux fixé dans ladite pièce cylindrique et entourant ladite bobine, o un noyau cylindrique en fer doux fixé sur ladite pièce cylindrique et s’insérant à l’intérieur dudit mandrin, ladite bobine étant positionnée dans l’entrefer ménagé entre ledit aimant et ledit noyau, ladite masse magnétique étant reliée audit châssis par un premier et un deuxième moyens de suspension axialement décalés, lesdits moyens permettant un débattement de ladite masse en translation axiale par rapport audit châssis, ledit transducteur présentant en outre les caractéristiques suivantes : • a moving part comprising a magnetic mass, said mass comprising: o a metallic cylindrical part defining a housing, o an annular permanent magnet in the form of a hollow cylinder fixed in said cylindrical part and surrounding said coil, o a cylindrical soft iron core fixed to said cylindrical part and fitting inside said mandrel, said coil being positioned in the air gap provided between said magnet and said core, said magnetic mass being connected to said frame by a first and a second axially offset suspension means, said means allowing movement of said mass in axial translation relative to said chassis, said transducer further having the following characteristics:
• chacun desdits moyens de suspension présente une pluralité de ressorts élémentaires, lesdits ressorts étant disposés selon une symétrie de rotation autour dudit axe entre une partie interne dudit moyen qui est solidaire de ladite masse magnétique et une partie externe dudit moyen qui est solidaire dudit châssis, lesdites parties étant mobiles l’une par rapport à l’autre en translation axiale par l’intermédiaire desdits ressorts élémentaires, • each of said suspension means has a plurality of elementary springs, said springs being arranged in rotational symmetry about said axis between an internal part of said means which is integral with said magnetic mass and an external part of said means which is integral with said frame, said parts being movable relative to each other in axial translation by means of said elementary springs,
• lesdits ressorts élémentaires comprennent un segment interne et un segment externe, lesdits segments s’étendant selon deux arcs de cercle concentriques autour dudit axe et étant séparés par une fente, lesdits segments présentant deux premières extrémités respectives reliées par un pont de liaison, ledit segment interne étant solidaire par une deuxième extrémité de ladite partie interne et ledit segment externe présentant une autre deuxième extrémité solidaire de ladite partie externe, le chemin allant desdites deuxièmes extrémités audit pont de liaison définissant un sens d’orientation desdits ressorts élémentaires,• said elementary springs comprise an internal segment and an external segment, said segments extending according to two concentric circular arcs around said axis and being separated by a slot, said segments having two respective first ends connected by a connecting bridge, said segment internal part being fixed by a second end to said internal part and said external segment having another second end fixed to said external part, the path going from said second ends to said connecting bridge defining a direction of orientation of said elementary springs,
• le sens d’orientation desdits ressorts élémentaires dudit premier moyen de suspension est opposé à celui desdits ressorts élémentaires dudit deuxième moyen de suspension, de sorte que chacun desdits moyens de suspension bloque l’autre desdits moyens de suspension en rotation axiale. • the direction of orientation of said elementary springs of said first suspension means is opposite to that of said elementary springs of said second suspension means, so that each of said suspension means blocks the other of said suspension means in axial rotation.
On rappelle que par le terme de « rotation axiale », on entend une rotation autour de l’axe de symétrie sus évoqué. Le terme « radialement » est également pris en référence à l’axe de symétrie sus évoqué. It is recalled that the term "axial rotation" means a rotation around the axis of symmetry mentioned above. The term “radially” is also taken with reference to the aforementioned axis of symmetry.
L’invention permet, par l’emploi de moyens de suspension ainsi agencés, d’avoir une masse magnétique suspendue ne pouvant débattre qu’en translation axiale. The invention makes it possible, by the use of suspension means thus arranged, to have a suspended magnetic mass that can only move in axial translation.
Et toute rotation axiale parasite est empêchée par l’action « antagoniste » des moyens de suspension dont les ressorts élémentaires sont orientés de façon opposée. And any parasitic axial rotation is prevented by the "antagonistic" action of the suspension means, the elementary springs of which are oriented oppositely.
L’impossibilité de débattement de la masse magnétique en rotation axiale garantit une restitution optimale du signal sonore. The impossibility of movement of the magnetic mass in axial rotation guarantees optimal reproduction of the sound signal.
Selon un deuxième aspect, l’invention a pour objet un élément d’habillage d’un compartiment de véhicule automobile pourvu d’un tel transducteur. According to a second aspect, the subject of the invention is a trim element for a motor vehicle compartment provided with such a transducer.
L’invention sera mieux comprise et d’autres avantages de celle-ci apparaîtront à la lecture de la description qui suit, faite en référence aux figures annexées dans lesquelles : The invention will be better understood and other advantages thereof will appear on reading the following description, made with reference to the appended figures in which:
• la figure 1 est une vue en coupe schématique selon une réalisation d’un transducteur en configuration de prémontage sur une paroi, • Figure 1 is a schematic sectional view according to one embodiment of a transducer in pre-assembly configuration on a wall,
• la figure 2 est une vue axiale d’un moyen de suspension selon un mode de réalisation, • Figure 2 is an axial view of a suspension means according to one embodiment,
• la figure 3 est une vue en perspective de deux moyens de suspension similaires à celui de la figure 2 tels que positionnés dans le transducteur de la figure 1 , • Figure 3 is a perspective view of two suspension means similar to that of Figure 2 as positioned in the transducer of Figure 1,
• la figure 4 est une vue axiale schématique, selon une réalisation, d’une bague de réglage de la raideur d’un moyen de suspension en interaction avec le moyen de suspension des figures 2 et 3, • la figure 5 est une vue schématique en coupe du transducteur de la figure 1 pourvu d’une bague de réglage telle qu’illustrée en figure 4,• Figure 4 is a schematic axial view, according to one embodiment, of a stiffness adjustment ring of a suspension means in interaction with the suspension means of Figures 2 and 3, • Figure 5 is a schematic sectional view of the transducer of Figure 1 provided with an adjustment ring as shown in Figure 4,
• la figure 6 est une vue de principe en perspective partielle d’une bague de réglage interagissant avec un ressort élémentaire selon un mode de réalisation, • Figure 6 is a principle view in partial perspective of an adjustment ring interacting with an elementary spring according to one embodiment,
• la figure 7 est une vue schématique en perspective d’un ressort élémentaire selon un mode de réalisation, • Figure 7 is a schematic perspective view of an elementary spring according to one embodiment,
• la figure 8 est analogue à la figure 1 , le transducteur étant monté sur la paroi. • Figure 8 is similar to Figure 1, the transducer being mounted on the wall.
En références aux figures, on décrit un transducteur électrodynamique 1 selon une réalisation, ledit transducteur comprenant : With reference to the figures, an electrodynamic transducer 1 is described according to one embodiment, said transducer comprising:
• une partie fixe comprenant un châssis 5 - notamment en matériau plastique moulé - pourvu d’un mandrin creux 8 s’inscrivant dans une enveloppe cylindrique s’étendant selon un axe de symétrie A, une bobine 9 étant enroulée autour dudit mandrin, • a fixed part comprising a frame 5 - in particular in molded plastic material - provided with a hollow mandrel 8 fitting into a cylindrical envelope extending along an axis of symmetry A, a coil 9 being wound around said mandrel,
• une partie mobile comprenant une masse magnétique 11 , ladite masse comprenant : o une pièce cylindrique 14 métallique - par exemple en fer doux - définissant un logement, o un aimant permanent annulaire 13 en forme de cylindre creux fixé dans ladite pièce cylindrique et entourant ladite bobine, o un noyau 12 cylindrique en fer doux fixé sur ladite pièce cylindrique et s’insérant à l’intérieur dudit mandrin, ladite bobine étant positionnée dans l’entrefer 10 ménagé entre ledit aimant et ledit noyau, ladite masse magnétique étant reliée audit châssis par un premier 19a et un deuxième 19b moyens de suspension 19 axialement décalés, lesdits moyens permettant un débattement de ladite masse en translation axiale par rapport audit châssis, ledit transducteur présentant en outre les caractéristiques suivantes : • chacun desdits moyens de suspension présente une pluralité de ressorts élémentaires 25, lesdits ressorts étant disposés selon une symétrie de rotation autour dudit axe entre une partie interne 22 dudit moyen solidaire de ladite masse et une partie externe 24 dudit moyen solidaire dudit châssis, lesdites parties étant mobiles l’une par rapport à l’autre en translation axiale par l’intermédiaire desdits ressorts élémentaires, • a movable part comprising a magnetic mass 11, said mass comprising: o a cylindrical metal part 14 - for example soft iron - defining a housing, o an annular permanent magnet 13 in the form of a hollow cylinder fixed in said cylindrical part and surrounding said coil, o a cylindrical soft iron core 12 fixed to said cylindrical part and fitting inside said mandrel, said coil being positioned in the air gap 10 provided between said magnet and said core, said magnetic mass being connected to said chassis by a first 19a and a second 19b suspension means 19 axially offset, said means allowing movement of said mass in axial translation relative to said frame, said transducer further having the following characteristics: • each of said suspension means has a plurality of elementary springs 25, said springs being arranged in rotational symmetry around said axis between an internal part 22 of said means integral with said mass and an external part 24 of said means integral with said frame, said parts being movable relative to each other in axial translation by means of said elementary springs,
• lesdits ressorts élémentaires comprennent un segment interne 26 et un segment externe 27, lesdits segments s’étendant selon deux arcs de cercle concentriques autour dudit axe et étant séparés par une fente 28, lesdits segments présentant deux premières extrémités respectives 30,31 reliées par un pont de liaison 29, ledit segment interne étant solidaire par une deuxième extrémité 32 de ladite partie interne et ledit segment externe présentant une autre deuxième extrémité 33 solidaire de ladite partie externe, le chemin allant desdites deuxièmes extrémités audit pont de liaison définissant un sens d’orientation S1 ,S2 desdits ressorts élémentaires, • said elementary springs comprise an inner segment 26 and an outer segment 27, said segments extending along two concentric circular arcs around said axis and being separated by a slot 28, said segments having two respective first ends 30,31 connected by a connecting bridge 29, said internal segment being secured by a second end 32 to said internal part and said external segment having another second end 33 secured to said external part, the path going from said second ends to said connecting bridge defining a direction of orientation S1, S2 of said elementary springs,
• le sens d’orientation S1 desdits ressorts élémentaires dudit premier moyen de suspension est opposé à celui S2 desdits ressorts élémentaires dudit deuxième moyen de suspension, de sorte que chacun desdits moyens de suspension bloque l’autre desdits moyens de suspension en rotation axiale. • the direction of orientation S1 of said elementary springs of said first suspension means is opposite to that S2 of said elementary springs of said second suspension means, so that each of said suspension means blocks the other of said suspension means in axial rotation.
Selon la réalisation représentée, au moins l’une et notamment les deux parties interne 22 et externe 24 sont annulaires. According to the embodiment shown, at least one and in particular the two internal 22 and external 24 parts are annular.
Afin de réaliser un système isostatique, il convient de prévoir que les moyens de suspension 19a, 19b soient pourvus d’au moins trois ressorts élémentaires 25 - lesdits moyens étant en particulier pourvus de quatre desdits ressorts selon la réalisation représentée. In order to achieve an isostatic system, provision should be made for the suspension means 19a, 19b to be provided with at least three elementary springs 25 - said means being in particular provided with four of said springs according to the embodiment shown.
Plus précisément, la figure 1 est une représentation d’un transducteur 1 , conforme à un mode de réalisation de l’invention, en position sur une paroi 2. Ici, la fixation sur la paroi 2 du transducteur 1 est effectuée, de manière amovible préférentiellement, à l’aide d’un socle 3. More specifically, Figure 1 is a representation of a transducer 1, in accordance with one embodiment of the invention, in position on a wall 2. Here, the fixing on the wall 2 of the transducer 1 is carried out, preferably removable, using a base 3.
Le socle 3 est lui-même solidarisé à la paroi 2 de manière définitive ou amovible. The base 3 is itself secured to the wall 2 in a permanent or removable manner.
Pour cela, le socle 3 est pourvu d’au moins un organe de fixation, par exemple une zone adhésive, un aimant, des perçages de passage de vis ou pointes. For this, the base 3 is provided with at least one fixing member, for example an adhesive zone, a magnet, holes for passing screws or spikes.
Afin de recevoir le transducteur proprement dit, le socle 3 comprend un moyen de fixation du transducteur. In order to receive the actual transducer, the base 3 comprises a means for fixing the transducer.
Ici, il s’agit d’un relief cylindrique 4 pourvu d’un filetage 41 sur sa face externe - ou interne selon une variante non représentée. Here, it is a cylindrical relief 4 provided with a thread 41 on its external face - or internal according to a variant not shown.
Selon un mode de réalisation alternatif non représenté, le moyen de fixation est un clip. According to an alternative embodiment not shown, the fastening means is a clip.
Comme cela ressort des figures 1 et 2, le transducteur 1 s’étend au-dessus de la paroi 2. As shown in Figures 1 and 2, transducer 1 extends above wall 2.
En variante non représentée, le socle 3 est logé dans un lamage ménagé dans la paroi 2, de sorte que lorsque le transducteur 1 est en position sur ladite paroi, sa face supérieure soit sensiblement coplanaire à ladite paroi. In a variant not shown, the base 3 is housed in a countersink made in the wall 2, so that when the transducer 1 is in position on said wall, its upper face is substantially coplanar with said wall.
En autre variante non représentée, le transducteur 1 n’est pas visible, étant incorporé dans la paroi 2. In another variant not shown, the transducer 1 is not visible, being incorporated in the wall 2.
Le châssis 5 est en matériau rigide insensible au champ magnétique, étant notamment, comme précisé avant, en matériau plastique moulé. En partie inférieure, le châssis 5 est équipé d’une partie de fixation 6 sur le socle 3. Cette partie 6 est de configuration complémentaire au relief 4 du socle 3. En l’espèce, elle est cylindrique et pourvue d’un filetage interne 42. The frame 5 is made of rigid material insensitive to the magnetic field, being in particular, as specified before, made of molded plastic material. In the lower part, the frame 5 is equipped with a fixing part 6 on the base 3. This part 6 is of complementary configuration to the relief 4 of the base 3. In this case, it is cylindrical and provided with an internal thread 42.
Le châssis 5 présente en coupe une forme générale de U. Il peut être d’une autre forme pour autant qu’il comporte un logement de réception de la masse magnétique 11. The frame 5 has a general U-shape in section. It can be of another shape provided that it includes a housing for receiving the magnetic mass 11.
Ce logement comprend un fond plat 7 équipé d’un mandrin creux 8 cylindrique à base circulaire. Le mandrin 8 est en position centrale sur le fond 7 et il est fixé sur ce dernier ; avantageusement il est venu de matière avec le fond 7, par exemple par moulage ou usinage ; en variante, il est collé ou soudé. This housing comprises a flat bottom 7 equipped with a hollow cylindrical mandrel 8 with a circular base. The mandrel 8 is in a central position on the bottom 7 and it is fixed on the latter; advantageously it is integral with the bottom 7, for example by molding or machining; alternatively, it is glued or welded.
Une bobine 9 est enroulée autour du mandrin 8. Cette bobine 9 est formée d’un fil métallique, en particulier de cuivre. A coil 9 is wound around the mandrel 8. This coil 9 is formed from a metal wire, in particular copper.
Le mandrin 8 équipé de la bobine 9 est inséré dans un entrefer 10 de forme complémentaire ménagé dans une masse magnétique 11 en deux parties. The mandrel 8 equipped with the coil 9 is inserted in an air gap 10 of complementary shape formed in a magnetic mass 11 in two parts.
Une première partie est un noyau cylindrique en fer doux 12 à base circulaire de dimensions adaptées pour être inséré de façon mobile, avec un jeu minimal, dans la lumière du mandrin 8. A first part is a cylindrical soft iron core 12 with a circular base of dimensions adapted to be inserted in a movable manner, with minimal clearance, in the slot of the mandrel 8.
La longueur du noyau 12 est supérieure à la longueur du mandrin 8, de sorte qu’une partie dudit noyau 12 s’étend au-dessus de l’extrémité ouverte du mandrin 8, comme cela ressort des figures 1 et 8. The length of the core 12 is greater than the length of the mandrel 8, so that part of said core 12 extends above the open end of the mandrel 8, as can be seen from figures 1 and 8.
Un aimant annulaire 13, enchâssé dans une pièce cylindrique métallique 14, forme la deuxième partie de la masse magnétique 11. La pièce cylindrique 14 a des dimensions et une forme telles qu’elle maintient l’aimant 13 tout en coiffant le noyau 12. L’aimant 13 est un aimant permanent composé par exemple d'un alliage de néodyme, de fer et de bore. An annular magnet 13, embedded in a metallic cylindrical part 14, forms the second part of the magnetic mass 11. The cylindrical part 14 has dimensions and a shape such that it holds the magnet 13 while covering the core 12. The magnet 13 is a permanent magnet composed for example of an alloy of neodymium, iron and boron.
Le noyau 12, la pièce cylindrique 14 et l’aimant 13 sont coaxiaux et concentriques. Leur axe commun A est aligné avec le centre du fond 7. Ici, l’axe A est matérialisé par l’axe longitudinal central d’un orifice cylindrique 15 dit de décompression s’étendant sur la hauteur du noyau 12 et traversant la portion de la pièce cylindrique 14 située au-dessus dudit noyau. The core 12, the cylindrical part 14 and the magnet 13 are coaxial and concentric. Their common axis A is aligned with the center of the bottom 7. Here, the axis A is materialized by the central longitudinal axis of a cylindrical orifice 15 called decompression orifice extending over the height of the core 12 and crossing the portion of the cylindrical piece 14 located above said core.
La paroi externe du noyau 12 et la paroi interne de la lumière de l’aimant 13 et de la pièce cylindrique 14 définissent l’entrefer 10. En d‘autres termes, la bobine 9 est insérée dans l’entrefer 10 entre les parties 12, 13, 14 constitutives de la masse magnétique 11 , cela avec un jeu minimal. The outer wall of the core 12 and the inner wall of the lumen of the magnet 13 and of the cylindrical part 14 define the air gap 10. In other words, the coil 9 is inserted into the air gap 10 between the parts 12 , 13, 14 constituting the magnetic mass 11, this with minimal play.
La masse magnétique 11 , formée par le noyau 12 et l’aimant 13 enchâssé dans la pièce cylindrique 14, est globalement en forme de disque avec une épaisseur voisine de la hauteur du châssis 5. The magnetic mass 11, formed by the core 12 and the magnet 13 embedded in the cylindrical part 14, is generally disc-shaped with a thickness close to the height of the frame 5.
Les parties 12, 13, 14 constitutives de la masse magnétique 11 sont maintenues ensemble par des moyens connus, par exemple par vissage, collage, soudage. The parts 12, 13, 14 constituting the magnetic mass 11 are held together by known means, for example by screwing, gluing, welding.
En variante, les parties 12, 14 sont monoblocs et obtenues par usinage ou moulage, l’aimant 13 étant inséré en force dans un logement ménagé dans la partie 14. As a variant, the parts 12, 14 are made in one piece and obtained by machining or molding, the magnet 13 being inserted by force into a housing provided in the part 14.
Les parois externes 16 de la pièce cylindrique 14 et les parois internes 17 du châssis 5 sont parallèles entre elles mais sans contact, ménageant ainsi entre elles un jeu 18. Ainsi, la masse magnétique 11 est mobile par rapport au châssis 5, grâce au jeu 18 et à l’entrefer 10, le mandrin 8 n’étant pas fixé au noyau 12 et à la bobine 9. En d’autres termes, la masse magnétique 11 est suspendue dans le châssis 5. Des moyens de suspension 19a, 19b assurent le maintien en suspension de la masse magnétique 11 dans le châssis 5. The outer walls 16 of the cylindrical part 14 and the inner walls 17 of the frame 5 are parallel to each other but without contact, thus leaving between them a clearance 18. Thus, the magnetic mass 11 is movable relative to the frame 5, thanks to the clearance 18 and to the air gap 10, the mandrel 8 not being fixed to the core 12 and to the coil 9. In other words, the magnetic mass 11 is suspended in the frame 5. Suspension means 19a, 19b keep the magnetic mass 11 in suspension in the frame 5.
Les moyens de suspension 19a, 19b sont parallèles entre eux. Ils sont disposés parallèlement au fond 7 du châssis 5, donc perpendiculairement à l’axe A lorsque la masse magnétique 11 est en place dans ledit châssis. Les moyens de suspension 19a, 19b sont maintenus, d’une part, sur la paroi interne 17 du châssis 5 et, d’autre part, sur la pièce cylindrique 14. The suspension means 19a, 19b are parallel to each other. They are arranged parallel to the bottom 7 of the frame 5, therefore perpendicular to the axis A when the magnetic mass 11 is in place in said frame. The suspension means 19a, 19b are held, on the one hand, on the internal wall 17 of the frame 5 and, on the other hand, on the cylindrical part 14.
Au niveau de la pièce cylindrique 14, les moyens de suspension 19a, 19b traversent la paroi externe 16 et s’étendent jusqu’à l’aimant annulaire 13. Les moyens de suspension 19a19b sont fixés au châssis 5 et à la masse magnétique 11 par des moyens connus en soi, ici par des vis 20 s’introduisant dans des orifices 51 . At the level of the cylindrical part 14, the suspension means 19a, 19b pass through the external wall 16 and extend as far as the annular magnet 13. The suspension means 19a19b are fixed to the frame 5 and to the magnetic mass 11 by means known per se, here by screws 20 being introduced into orifices 51 .
Les moyens de suspension 19a, 19b s’étendent ainsi à travers tout le jeu 18 et ils maintiennent en suspension la masse magnétique 11 par rapport au châssis 5, en autorisant des mouvements de translation, alternativement dans un sens et dans l’autre, avec des amplitudes variables, de ladite masse magnétique par rapport au mandrin 8, selon une direction confondue avec l’axe A, comme illustré par la double flèche F à la figure 8. The suspension means 19a, 19b thus extend through the entire clearance 18 and they maintain the magnetic mass 11 in suspension with respect to the frame 5, authorizing translational movements, alternately in one direction and in the other, with variable amplitudes, of said magnetic mass relative to the chuck 8, in a direction coinciding with the axis A, as illustrated by the double arrow F in Figure 8.
Selon la réalisation représentée, un ressort élémentaire 25 est entouré par une fente externe 50 en U s’étendant entre ses deux deuxièmes extrémités 32,33 en passant par le pont de liaison 29. According to the embodiment shown, an elementary spring 25 is surrounded by an external U-shaped slot 50 extending between its two second ends 32,33 passing through the connecting bridge 29.
En particulier, la fente interne 28 d’un ressort élémentaire 25 s’étend entre ses deux deuxièmes extrémités 32,33 pour déboucher dans la fente externe 50 du ressort élémentaire 25 contigu qui est disposé à l’opposé du sens d’orientation S1 ,S2 desdits ressorts. In particular, the internal slot 28 of an elementary spring 25 extends between its two second ends 32,33 to open into the external slot 50 of the adjoining elementary spring 25 which is arranged opposite the direction of orientation S1, S2 of said springs.
Selon la réalisation représentée : • le segment externe 27 est relié à la partie externe 24 uniquement par sa deuxième extrémité 33, According to the embodiment shown: • the outer segment 27 is connected to the outer part 24 only by its second end 33,
• le segment interne 26 est relié à la partie interne 22 uniquement par sa deuxième extrémité 32, • the internal segment 26 is connected to the internal part 22 only by its second end 32,
• lesdits segments sont reliés entre eux uniquement par le pont de liaison 29. • said segments are interconnected only by the connecting bridge 29.
Selon la réalisation représentée, les deuxièmes extrémités 32,33 sont situées radialement à l’aplomb l’une de l’autre. According to the embodiment shown, the second ends 32,33 are located radially plumb with each other.
Les segments 26,27 ont alors une même étendue angulaire selon l’axe A, et donc une longueur analogue, permettant une translation axiale ne s’accompagnant pas d’une rotation axiale. The segments 26,27 then have the same angular extent along the axis A, and therefore a similar length, allowing an axial translation not accompanied by an axial rotation.
Selon la réalisation représentée, les moyens de suspension 19a, 19b sont en forme générale d’anneaux circulaires aplatis définissant une lumière 21 et s’inscrivant généralement dans deux plans perpendiculaires à l’axe de symétrie A. According to the embodiment shown, the suspension means 19a, 19b are in the general shape of flattened circular rings defining a slot 21 and generally falling within two planes perpendicular to the axis of symmetry A.
Selon la réalisation représentée, les moyens de suspension 19a, 19b sont situés respectivement au niveau de chacune des extrémités de l’aimant 13, de manière à maximiser l’écart entre eux et à éviter, en vue latérale, tout mouvement parasite de rotation non axiale de la masse magnétique 11 quand le transducteur 1 est en utilisation. According to the embodiment shown, the suspension means 19a, 19b are located respectively at each of the ends of the magnet 13, so as to maximize the gap between them and to avoid, in side view, any parasitic movement of rotation not axial of the magnetic mass 11 when the transducer 1 is in use.
Selon un mode de réalisation, les moyens de suspension 19a, 19b sont issus de deux plaques métalliques découpées. According to one embodiment, the suspension means 19a, 19b come from two cut metal plates.
Selon un autre mode de réalisation, les moyens de suspension 19a, 19b sont en matériau plastique moulé, ledit matériau pouvant être chargé en fibres. En particulier, ils peuvent être intégrés à une pièce moulée unique de manière à former un ensemble monobloc. Selon un autre mode de réalisation, les moyens de suspension 19a, 19b sont à base de carton découpé. According to another embodiment, the suspension means 19a, 19b are made of molded plastic material, said material possibly being filled with fibers. In particular, they can be integrated into a single molded part so as to form a one-piece assembly. According to another embodiment, the suspension means 19a, 19b are made from cut cardboard.
Selon un autre mode de réalisation, les moyens de suspension 19a, 19b sont en matériau composite. According to another embodiment, the suspension means 19a, 19b are made of composite material.
Comme cela apparaît en figure 1 , un capot de protection 38 coiffe la partie active du transducteur 1 . As shown in FIG. 1, a protective cover 38 caps the active part of transducer 1 .
La fixation des moyens de suspension 19a, 19b respectivement sur le châssis 5 et la masse magnétique 11 se fait ici par des vis 20. The fixing of the suspension means 19a, 19b respectively on the frame 5 and the magnetic mass 11 is done here by screws 20.
Selon le mode de réalisation représenté en figure 7, les moyens de suspension 19a, 19b étant notamment en matériau plastique moulé, les segments 26,27 présentent une épaisseur 40 s’amincissant à mesure que l’on se dirige vers le pont 29. According to the embodiment shown in Figure 7, the suspension means 19a, 19b being in particular made of molded plastic material, the segments 26,27 have a thickness 40 which becomes thinner as one moves towards the bridge 29.
Selon le mode de réalisation représenté en figure 7, les moyens de suspension 19a, 19b étant notamment en matériau plastique moulé, les segments 26,27 présentent une largeur 39 s’amincissant à mesure que l’on se dirige vers le pont 29. According to the embodiment shown in Figure 7, the suspension means 19a, 19b being in particular made of molded plastic material, the segments 26,27 have a width 39 which becomes thinner as one moves towards the bridge 29.
En appliquant l’une et/ou l’autre de ces caractéristiques, on confère aux ressorts élémentaires 25 une raideur évolutive permettant de transmettre avec une efficacité maximale la force d’inertie de la masse magnétique 11 sur la paroi 2 à faire vibrer. By applying one and/or the other of these characteristics, the elementary springs 25 are given a progressive stiffness making it possible to transmit with maximum efficiency the force of inertia of the magnetic mass 11 on the wall 2 to be vibrated.
En outre, une telle conception évite aux ressorts 25 de se comporter comme des résonateurs auxiliaires absorbant, à leur résonance, les vibrations de la masse 11 ; en effet, un tel comportement empêcherait la transmission de la force d’inertie à la fréquence de résonance. Selon la réalisation représentée en figures 4 à 6, le transducteur 1 comprend en outre une bague 35 de réglage de la raideur d’au moins un moyen de suspension 19a, 19b, ladite bague étant montée en rotation sur la masse magnétique 11 , ladite bague comprenant une pluralité de curseurs 37 prenant appui sur les ressorts élémentaires 25 pour définir la longueur de bras de levier des segments 26,27 et la raideur qui en résulte. In addition, such a design prevents the springs 25 from behaving like auxiliary resonators absorbing, at their resonance, the vibrations of the mass 11; indeed, such behavior would prevent the transmission of the inertial force at the resonant frequency. According to the embodiment shown in Figures 4 to 6, the transducer 1 further comprises a ring 35 for adjusting the stiffness of at least one suspension means 19a, 19b, said ring being rotatably mounted on the magnetic mass 11, said ring comprising a plurality of sliders 37 resting on the elementary springs 25 to define the length of the lever arm of the segments 26,27 and the resulting stiffness.
Avec un tel agencement, il est possible de prévoir l’utilisation d’un transducteur 1 commun à diverses applications requérant des raideurs différentes des moyens de suspension 19a, 19b. With such an arrangement, it is possible to provide for the use of a common transducer 1 for various applications requiring different stiffnesses of the suspension means 19a, 19b.
Selon un mode de réalisation, on utilise une bague 35 en un matériau rigide, par exemple en polymère. According to one embodiment, a ring 35 made of a rigid material, for example a polymer, is used.
Selon la réalisation représentée, la bague 35 est pourvue, sur sa face 36 orientée en direction du moyen de suspension 19a, 19b, de plusieurs curseurs 37 prenant chacun appui sur un ressort 25 respectif. According to the embodiment shown, the ring 35 is provided, on its face 36 oriented in the direction of the suspension means 19a, 19b, with several sliders 37 each resting on a respective spring 25.
Selon la réalisation représentée, les curseurs 37 s’introduisent par une saillie en coulissement dans les fentes 28, 50. According to the embodiment shown, the sliders 37 are introduced by a sliding projection into the slots 28, 50.
Selon la position des curseurs 37, on raidit plus ou moins les ressorts élémentaires 25, en réglant la longueur de bras de levier de chacun des segments 26, 27 ; pour régler la position des curseurs 37, il suffit de tourner la bague 35 dans le sens horaire ou antihoraire. Depending on the position of the sliders 37, the elementary springs 25 are stiffened more or less, by adjusting the length of the lever arm of each of the segments 26, 27; to adjust the position of sliders 37, simply turn ring 35 clockwise or counterclockwise.
On décrit enfin un élément d’habillage d’un compartiment de véhicule automobile pourvu d’au moins un transducteur 1 tel que décrit précédemment, ledit élément comprenant : Finally, a trim element of a motor vehicle compartment provided with at least one transducer 1 as described above is described, said element comprising:
• une paroi 2 de fixation dudit transducteur, • a wall 2 for fixing said transducer,
• un socle 3 fixé sur ladite paroi, le châssis 5 étant associé audit socle - notamment par des filetages réciproques 41 ,42 prévus respectivement sur ledit socle et ledit châssis. • a base 3 fixed to said wall, the frame 5 being associated with said base - in particular by reciprocal threads 41, 42 respectively provided on said base and said frame.

Claims

REVENDICATIONS
1. T ransducteur électrodynamique (1 ) comprenant : 1. Electrodynamic transducer (1) comprising:
• une partie fixe comprenant un châssis (5) pourvu d’un mandrin creux (8) s’inscrivant dans une enveloppe cylindrique s’étendant selon un axe de symétrie (A), une bobine (9) étant enroulée autour dudit mandrin, • a fixed part comprising a frame (5) provided with a hollow mandrel (8) forming part of a cylindrical casing extending along an axis of symmetry (A), a coil (9) being wound around said mandrel,
• une partie mobile comprenant une masse magnétique (11), ladite masse comprenant : o une pièce cylindrique (14) métallique définissant un logement, o un aimant permanent annulaire (13) en forme de cylindre creux fixé dans ladite pièce cylindrique et entourant ladite bobine, o un noyau (12) cylindrique en fer doux fixé sur ladite pièce cylindrique et s’insérant à l’intérieur dudit mandrin, ladite bobine étant positionnée dans l’entrefer (10) ménagé entre ledit aimant et ledit noyau, ladite masse magnétique étant reliée audit châssis par un premier (19a) et un deuxième (19b) moyens de suspension (19) axialement décalés, lesdits moyens permettant un débattement de ladite masse en translation axiale par rapport audit châssis, ledit transducteur étant caractérisé en ce que : • a moving part comprising a magnetic mass (11), said mass comprising: o a metallic cylindrical part (14) defining a housing, o an annular permanent magnet (13) in the form of a hollow cylinder fixed in said cylindrical part and surrounding said coil , o a cylindrical soft iron core (12) fixed to said cylindrical part and fitting inside said mandrel, said coil being positioned in the air gap (10) formed between said magnet and said core, said magnetic mass being connected to said frame by first (19a) and second (19b) suspension means (19) axially offset, said means allowing movement of said mass in axial translation relative to said frame, said transducer being characterized in that:
• chacun desdits moyens de suspension présente une pluralité de ressorts élémentaires (25), lesdits ressorts étant disposés selon une symétrie de rotation autour dudit axe entre une partie interne (22) dudit moyen qui est solidaire de ladite masse magnétique et une partie externe (24) dudit moyen qui est solidaire dudit châssis, lesdites parties étant mobiles l’une par rapport à l’autre en translation axiale par l’intermédiaire desdits ressorts élémentaires, • each of said suspension means has a plurality of elementary springs (25), said springs being arranged according to rotational symmetry about said axis between an internal part (22) of said means which is integral with said magnetic mass and an external part (24 ) said means which is integral with said frame, said parts being movable relative to each other in axial translation by means of said elementary springs,
• lesdits ressorts élémentaires comprennent un segment interne (26) et un segment externe (27), lesdits segments s’étendant selon deux arcs de cercle concentriques autour dudit axe et étant séparés par une fente (28), lesdits segments présentant deux premières extrémités respectives (30,31) reliées par un pont de liaison (29), ledit segment interne étant solidaire par une deuxième extrémité (32) de ladite partie interne et ledit segment externe présentant une autre deuxième extrémité (33) solidaire de ladite partie externe, le chemin allant desdites deuxièmes extrémités audit pont de liaison définissant un sens d’orientation (S1 , S2) desdits ressorts élémentaires, • said elementary springs comprise an internal segment (26) and an external segment (27), said segments extending according to two concentric circular arcs around said axis and being separated by a slot (28), said segments having two respective first ends (30,31) connected by a connecting bridge (29), said segment internal part being secured by a second end (32) to said internal part and said external segment having another second end (33) secured to said external part, the path going from said second ends to said connecting bridge defining a direction of orientation (S1 , S2) of said elementary springs,
• le sens d’orientation (S1 ) desdits ressorts élémentaires dudit premier moyen de suspension est opposé à celui (S2) desdits ressorts élémentaires dudit deuxième moyen de suspension, de sorte que chacun desdits moyens de suspension bloque l’autre desdits moyens de suspension en rotation axiale. • the direction of orientation (S1) of said elementary springs of said first suspension means is opposite to that (S2) of said elementary springs of said second suspension means, so that each of said suspension means blocks the other of said suspension means in axial rotation.
2. Transducteur selon la revendication 1 , caractérisé en ce qu’au moins l’une des parties interne (22) et externe (24) est annulaire. 2. Transducer according to claim 1, characterized in that at least one of the inner (22) and outer (24) parts is annular.
3. Transducteur selon l’une des revendications précédentes, caractérisé en ce qu’un ressort élémentaire (25) est entouré par une fente externe (50) en U s’étendant entre ses deux deuxièmes extrémités (32,33) en passant par le pont de liaison (29). 3. Transducer according to one of the preceding claims, characterized in that an elementary spring (25) is surrounded by an external U-shaped slot (50) extending between its two second ends (32,33) passing through the connecting bridge (29).
4. Transducteur selon la revendication 3, caractérisé en ce que la fente interne (28) d’un ressort élémentaire (25) s’étend entre ses deux deuxièmes extrémités (32,33) pour déboucher dans la fente externe (50) du ressort élémentaire (25) contigu qui est disposé à l’opposé du sens d’orientation (S1 ,S2) desdits ressorts. 4. Transducer according to claim 3, characterized in that the internal slot (28) of an elementary spring (25) extends between its two second ends (32,33) to open into the external slot (50) of the spring element (25) contiguous which is arranged opposite the direction of orientation (S1, S2) of said springs.
5. Transducteur selon l'une quelconque des revendications précédentes, caractérisé en ce que : 5. Transducer according to any one of the preceding claims, characterized in that:
• le segment externe (27) est relié à la partie externe (24) uniquement par sa deuxième extrémité (33), • the outer segment (27) is connected to the outer part (24) only by its second end (33),
• le segment interne (26) est relié à la partie interne (22) uniquement par sa deuxième extrémité (32), • the internal segment (26) is connected to the internal part (22) only by its second end (32),
• lesdits segments sont reliés entre eux uniquement par le pont de liaison (29). • said segments are interconnected only by the connecting bridge (29).
6. Transducteur selon l'une quelconque des revendications précédentes, caractérisé en ce que les deuxièmes extrémités (32,33) sont situées radialement à l’aplomb l’une de l’autre. 6. Transducer according to any one of the preceding claims, characterized in that the second ends (32,33) are located radially plumb with one another.
7. Transducteur selon l’une quelconque des revendications précédentes, caractérisé en ce que les moyens de suspension (19a, 19b) sont en forme générale d’anneaux circulaires aplatis définissant une lumière (21 ) et s’inscrivant généralement dans deux plans perpendiculaires à l’axe de symétrie (A). 7. Transducer according to any one of the preceding claims, characterized in that the suspension means (19a, 19b) are in the general shape of flattened circular rings defining a slot (21) and generally falling within two planes perpendicular to the axis of symmetry (A).
8. Transducteur selon l'une quelconque des revendications précédentes, caractérisé en ce que les moyens de suspension (19a, 19b) sont situés respectivement au niveau de chacune des extrémités de l’aimant (13). 8. Transducer according to any one of the preceding claims, characterized in that the suspension means (19a, 19b) are located respectively at each of the ends of the magnet (13).
9. Transducteur selon l'une quelconque des revendications précédentes, caractérisé en ce que les moyens de suspension (19a, 19b) sont : 9. Transducer according to any one of the preceding claims, characterized in that the suspension means (19a, 19b) are:
• issus de deux plaques métalliques découpées, • from two cut metal plates,
• ou en matériau plastique moulé, • or in molded plastic material,
• ou à base de carton découpé, • or based on cut cardboard,
• ou en matériau composite. • or in composite material.
10. Transducteur selon l'une quelconque des revendications précédentes, caractérisé en ce que les segments (26,27) présentent une épaisseur (40) s’amincissant à mesure que l’on se dirige vers le pont (29). 10. Transducer according to any one of the preceding claims, characterized in that the segments (26,27) have a thickness (40) which becomes thinner as one moves towards the bridge (29).
11 .Transducteur selon l'une quelconque des revendications précédentes, caractérisé en ce que les segments (26,27) présentent une largeur (39) s’amincissant à mesure que l’on se dirige vers le pont (29). 11. Transducer according to any one of the preceding claims, characterized in that the segments (26,27) have a width (39) which becomes thinner as one moves towards the bridge (29).
12. Transducteur selon l'une quelconque des revendications précédentes, caractérisé en ce qu’il comprend en outre une bague (35) de réglage de la raideur d’au moins un moyen de suspension (19a, 19b), ladite bague étant montée en rotation sur la masse magnétique (11 ), ladite bague comprenant une pluralité de curseurs (37) prenant chacun appui sur les ressorts élémentaires (25) pour définir la longueur de bras de levier des segments (26,27) et la raideur qui en résulte. 12. Transducer according to any one of the preceding claims, characterized in that it further comprises a ring (35) for adjusting the stiffness of at least one suspension means (19a, 19b), said ring being mounted in rotation on the magnetic mass (11), said ring comprising a plurality of sliders (37) each bearing on the elementary springs (25) to define the length of the lever arm of the segments (26,27) and the resulting stiffness.
13. Elément d’habillage d’un compartiment de véhicule automobile pourvu d’au moins un transducteur (1 ) selon l'une quelconque des revendications précédentes, ledit élément comprenant : 13. Trim element of a motor vehicle compartment provided with at least one transducer (1) according to any one of the preceding claims, said element comprising:
• une paroi (2) de fixation dudit transducteur, • a wall (2) for fixing said transducer,
• un socle (3) fixé sur ladite paroi, le châssis (5) étant associé audit socle. • a base (3) fixed to said wall, the frame (5) being associated with said base.
EP21743157.6A 2020-07-09 2021-07-08 Electrodynamic transducer for vehicle Active EP4179736B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR2007289A FR3112445B1 (en) 2020-07-09 2020-07-09 ELECTROACOUSTIC TRANSDUCER
PCT/EP2021/069063 WO2022008685A1 (en) 2020-07-09 2021-07-08 Electrodynamic transducer

Publications (2)

Publication Number Publication Date
EP4179736A1 true EP4179736A1 (en) 2023-05-17
EP4179736B1 EP4179736B1 (en) 2024-08-28

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Application Number Title Priority Date Filing Date
EP21743157.6A Active EP4179736B1 (en) 2020-07-09 2021-07-08 Electrodynamic transducer for vehicle

Country Status (5)

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US (1) US20230254647A1 (en)
EP (1) EP4179736B1 (en)
CN (1) CN116195272A (en)
FR (1) FR3112445B1 (en)
WO (1) WO2022008685A1 (en)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6385327B1 (en) * 1998-06-16 2002-05-07 U.S. Philips Corporation Device having two coaxially disposed bodies which are movable relative to one another along a translation axis
US7050593B1 (en) * 1999-08-25 2006-05-23 Lear Corporation Vehicular audio system and electromagnetic transducer assembly for use therein
US7418108B2 (en) * 2004-02-19 2008-08-26 So Sound Solutions, Llc Transducer for tactile applications and apparatus incorporating transducers
KR101855335B1 (en) * 2016-07-01 2018-05-08 주식회사 예일전자 Apparatus for generating sound by using vehivle body
DE102016225716A1 (en) * 2016-12-21 2018-06-21 Robert Bosch Gmbh Electric vibration generator for generating sound, method for producing an electric vibration generator and motor vehicle with an electric vibration exciter
GB201820557D0 (en) * 2018-12-17 2019-01-30 Pss Belgium Nv Inertial exciter

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EP4179736B1 (en) 2024-08-28
CN116195272A (en) 2023-05-30
WO2022008685A1 (en) 2022-01-13
FR3112445A1 (en) 2022-01-14
US20230254647A1 (en) 2023-08-10
FR3112445B1 (en) 2023-05-12

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