Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; 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; ELECTRIC HEARING AIDS; 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; ELECTRIC HEARING AIDS; 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; ELECTRIC HEARING AIDS; 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; ELECTRIC HEARING AIDS; 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; ELECTRIC HEARING AIDS; 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; ELECTRIC HEARING AIDS; 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; ELECTRIC HEARING AIDS; 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; ELECTRIC HEARING AIDS; 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
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
  • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
  • H04R9/06—Loudspeakers
  • H04R9/066—Loudspeakers using the principle of inertia

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)
• Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
• Vibration Prevention Devices (AREA)
• Apparatuses For Generation Of Mechanical Vibrations (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=73013584

Family Applications (1)

Country Status (7)

Families Citing this family (3)

Family Cites Families (15)

• 2020
  • 2020-07-09 FR FR2007289A patent/FR3112445B1/fr active Active
• 2021
  • 2021-07-08 WO PCT/EP2021/069063 patent/WO2022008685A1/fr not_active Ceased
  • 2021-07-08 HU HUE21743157A patent/HUE069679T2/hu unknown
  • 2021-07-08 US US18/015,100 patent/US20230254647A1/en not_active Abandoned
  • 2021-07-08 ES ES21743157T patent/ES3005232T3/es active Active
  • 2021-07-08 CN CN202180048310.9A patent/CN116195272A/zh active Pending
  • 2021-07-08 EP EP21743157.6A patent/EP4179736B1/de active Active

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