EP4099717A1 - Lautsprechermotor mit zwei entgegengesetzten magneten - Google Patents

Lautsprechermotor mit zwei entgegengesetzten magneten Download PDF

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Publication number
EP4099717A1
EP4099717A1 EP22176354.3A EP22176354A EP4099717A1 EP 4099717 A1 EP4099717 A1 EP 4099717A1 EP 22176354 A EP22176354 A EP 22176354A EP 4099717 A1 EP4099717 A1 EP 4099717A1
Authority
EP
European Patent Office
Prior art keywords
loudspeaker
central
membrane
magnetic circuit
coil
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP22176354.3A
Other languages
English (en)
French (fr)
Inventor
Jean-Loup AFRESNE
Fabrice Marteau
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.)
Devialet SA
Original Assignee
Devialet SA
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 Devialet SA filed Critical Devialet SA
Publication of EP4099717A1 publication Critical patent/EP4099717A1/de
Pending legal-status Critical Current

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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
    • H04R9/025—Magnetic circuit
    • H04R9/027—Air gaps using a magnetic fluid
    • 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
    • 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
    • H04R9/02—Details
    • H04R9/04—Construction, mounting, or centering of coil
    • H04R9/045—Mounting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • 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
    • H04R2400/11—Aspects regarding the frame of loudspeaker transducers

Definitions

  • the present invention relates to a loudspeaker comprising a chassis comprising a magnetic circuit comprising, on the one hand, a toroidal external metal carcass around an axis and, on the other hand, a stack comprising a central metal core placed between a first magnet and a second magnet, of polarities in opposite directions along the axis, aligned along this same axis and themselves placed between a first metallic disc, and a second metallic disc, the central core and at least one disc defining with the carcass an air gap, the loudspeaker comprising a movable assembly movable relative to the magnetic circuit along the axis, the movable assembly comprising a coil holder carrying a coil and a membrane, the coil holder being mounted so as to move across the air gaps, the loudspeaker comprising a first element for guiding the movable assembly disposed between the movable assembly and the frame on the side of the membrane with respect to the magnetic circuit.
  • the document US 7065 225 B2 describes a loudspeaker comprising a magnetic circuit comprising two magnets of coaxial polarity and opposite directions and a central core placed between the two magnets, which are themselves placed between, on the one hand, a metal disc, and on the other hand , a cylinder head formed of an outer carcass in the shape of a ferrule closed at one end by a metal disc.
  • the yoke surrounds the magnets, the central core and the metal disc, thus closing the magnetic circuit.
  • a coil is integral with a coil holder which is linked to the membrane, thus forming a mobile assembly that can be moved through the magnetic circuit.
  • the coil surrounds the central core and is itself surrounded by the yoke, so that the coil passes through the magnetic circuit in an annular air gap.
  • a first element for guiding the moving assembly commonly referred to as suspension, connects the membrane to a flared casing commonly referred to as salad bowl.
  • the first and second guide elements are placed on the same side of the magnetic circuit.
  • the problem related to such maintenance of the reel holder is insufficient guidance in translation of the reel holder.
  • the object of this invention is to provide a loudspeaker which allows improved guidance of the spool holder.
  • the subject of the invention is a loudspeaker of the aforementioned type, characterized in that each metal disc delimits with the carcass an end air gap, the mobile assembly passes right through the magnetic circuit through the end air gaps and the loudspeaker comprises a complementary guide element, arranged between the mobile assembly and the frame, on the side opposite the membrane with respect to the magnetic circuit.
  • the loudspeaker according to the invention has a large axial spacing between the guide elements which are arranged on either side of the magnetic circuit, improving the guidance in translation of the moving assembly.
  • the invention further relates to an audio device, comprising a loudspeaker as defined above.
  • Loudspeaker 1 comprises a chassis 3 comprising a magnetic circuit 4, and a moving element 5 which is slidably movable relative to chassis 3 along an axis A-A.
  • the moving assembly 5 comprises a coil 25 secured to a revolving coil carrier 30.
  • the coil carrier 30 is oriented along an axis A-A.
  • the coil 25 comprises only a central winding section 31.
  • the central winding section 31 is formed by a winding of at least one conductive wire, wound around the reel holder 30 and distributed over one or more layers.
  • the reel holder 30 comprises a tubular main body 32, one end of which is fixed to a membrane 35.
  • the membrane 35 is for example formed from injected plastic.
  • the membrane 35 includes a groove 40.
  • the tubular main body 32 of the reel holder is embedded in the groove 40 of the membrane.
  • the spool holder 30 is for example glued to the membrane 35 in the groove 40.
  • the moving assembly 5 comprises a divergent part 45 extending the main tubular body 32 of the spool holder at its other end.
  • the divergent has a form of revolution with axis AA.
  • Divergent 45 is for example formed from injected plastic. It comprises a groove 50, and the tubular main body 32 of the spool holder is embedded in the groove 50.
  • the spool holder body 30 is for example glued to the divergent 45 in the groove 50 of the divergent.
  • the free end of the divergent 45 opposite its connecting end of the main body 32 is wider than the end of the main body 32.
  • the magnetic circuit 4 comprises a cylindrical metal frame with axis AA denoted 52 composed of a first metal ferrule 55 on the side of the membrane 35 and a second metal ferrule 60 on the side opposite the membrane 35.
  • the two ferrules 55, 60 are connected along a peripheral shoulder.
  • the two ferrules 55, 60 have, at their ends opposite their shoulders, an internal collar 61, 62 reducing their inside diameter.
  • An internal counterbore is thus provided for the housing of the central winding section 31.
  • the internal diameter of the carcass 52 is thus smaller at its two ends than in its central region.
  • the magnetic circuit also comprises a stack 63, of axis A-A placed inside the volume formed by the carcass 52.
  • Stack 63 comprises two magnets 65, 70, both disc-shaped.
  • a light passes through the two magnets 65, 70, for example along the axis A-A.
  • the disc shape of the two magnets is then more particularly, according to this embodiment, a ring shape.
  • the disc shape of the two magnets 65, 70 is a solid shape.
  • the disk shape of the two magnets 65, 70 is then more particularly, according to this embodiment, a plate shape.
  • the axis and field of the magnets are aligned along the A-A axis.
  • the magnets 65 and 70 are for example ferrite magnets.
  • the stack 63 also comprises a central metallic core of revolution of axis A-A denoted 75 placed between the magnets 65 and 70, in contact with the latter.
  • the central core 75 laterally forms a pole of the magnetic circuit opposite the ferrule 55 and delimits an air gap 77 with this ferrule 55 in which the central winding section 31 extends. only the coil 25 extends opposite the central core 75.
  • the stack 63 comprises two metal discs 80, 85 with axes of revolution A-A.
  • a light passes through the two discs 80, 85, for example along the axis A-A.
  • the two metal discs 80, 85 are then similar to rings.
  • the two metal discs 80, 85 are solid.
  • the two metal discs 80, 85 can then be assimilated to platters.
  • the first metal disc 80 is placed between the magnet 65 and the membrane 35, in contact with the magnet 65.
  • the magnet 70 is located between the second metal disc 85 and the central core 75, in contact with the latter.
  • the metal discs 80, 85 define, with the carcass 52, two air gaps 86, 87, subsequently called end air gaps, of the magnetic circuit.
  • the metal discs 80, 85 are surrounded by the collars 61, 62 of the carcass with which they form the two air gaps 86, 87 at the end of the magnetic circuit.
  • the frame 3 includes a central pillar 90 in contact with the second metal disc 85, on the side opposite the second magnet 70.
  • the central pillar 90 is for example a stamped steel part.
  • the central pillar 90 has the shape of a vase, the end in contact with the second metal disc 85 forming a broadening collar of external diameter substantially similar to that of the second magnet.
  • the central pillar 90 comprises a shoulder 91 narrowing its diameter at its opposite end.
  • the frame 3 also comprises a flared casing 93, commonly called a salad bowl, extending the first ferrule 55 on the side of the membrane 35.
  • the flared casing 93 widens in a direction opposite to the first ferrule 55 and receives the membrane 35 at its larger diameter open end.
  • the loudspeaker according to the invention comprises a guide element for the movable assembly on the side of the membrane 35, consisting of a suspension 105 in the form of an O-ring.
  • the suspension 105 is linked on the one hand to the large diameter end of the flared casing 93 and on the other hand to the periphery of the membrane 35, the membrane being surrounded by the suspension.
  • the cross-sectional suspension has an ⁇ shape.
  • the suspension 105 is for example glued on the one hand to the flared casing 93 and on the other hand to the membrane 35.
  • a complementary guide element 110 is arranged on the side opposite the membrane 35 with respect to the magnetic circuit 4. It is formed by a corrugated joint. This type of joint is also called "spider" in English.
  • the complementary guide element 110 is formed by a suspension in the form of an O-ring, for example having an ⁇ -shaped section. The general shape of the complementary guide element 110 is then similar to the general shape of the suspension 105.
  • the complementary guide element 110 is in contact on the one hand with the central pillar 90 and on the other hand with the divergent 45.
  • the complementary guide element is in contact with the wide end of the divergent 45 and in contact with the shoulder 91 of the central pillar.
  • the complementary guide element 110 is for example glued with the divergent 45 and with the central pillar 90.
  • the frame 3 comprises a cap 115 for protecting the complementary guide element 110, connecting the free base of the pillar 90 to the carcass 52 by surrounding the complementary guide element 110. Its diameter and its length allow the movement of the complementary guide element 110 and mobile assembly 5 during operation of loudspeaker 1.
  • Electrical supply wires 117, 118 are connected on either side of the coil 25.
  • the protective cap 115 on the one hand and the flared casing 93 on the other hand each have a passage hole 120, 125 for the supply son 117, 118, emerging on either side of the reel holder.
  • the coil 25 thus consists of an odd number of layers of wires.
  • a power supply on either side of the coil 25 makes it possible to obtain a coil comprising an odd number of layers of wires.
  • the supply wires emerge from the same side of the coil.
  • the protective cap 115 then has the two passage holes for the supply wires 117, 118.
  • the magnetic field generated by the magnets in opposition 65 and 70 is conducted by the magnetic circuit 4.
  • the magnetic flux is of opposite direction in the central air gap 77 and in the air gaps 86 and 87.
  • the electromagnetic force on the crew 5 generated by a current flowing in the central winding section 31 is in the opposite direction in the air gaps 86 and 87 with respect to the force generated by this same current in the central air gap 77.
  • the more the central winding section 31 deviates from the central air gap 77 the more the amplitude of the electromagnetic force generated by the magnetic flux of the central air gap 77 decreases and the more the amplitude of the electromagnetic force generated by the flux of one of the air gaps 86 and 87 increase. This forms a magnetic braking of the moving assembly 5.
  • the suspension 105 and the complementary guide element 110 are both fixed on the one hand to the frame 3 and on the other hand to an element of the mobile assembly 5.
  • the guide elements maintain the mobile assembly 5 in its two ends, on either side of the magnetic circuit 4. This position of the guide elements on the movable assembly 5 makes it possible to guide the movement of the movable assembly 5 in order to allow movement mainly in translation parallel to the axis AA and to prevent any rotation of the mobile assembly 5 relative to the rest of the loudspeaker 1.
  • the coil 25 comprises, in addition to the central winding section 31, two end winding sections 130, 135.
  • the end winding sections 130, 135 are formed by a winding of at least one conductive wire, wound around the reel holder 30 and distributed over one or more layers.
  • the central winding section 31 and the end winding sections 130, 135 are for example formed by the same conducting wire, the sections being for example connected by unwound sections of the conducting wire.
  • the end winding sections 130, 135 each extending at rest through an end air gap 86, 87.
  • the winding direction of the end winding sections 130, 135 around the spool holder 35 is opposite to the winding direction of the central winding section 31 around the spool holder 35.
  • the central winding 31 is wound in a clockwise direction, seen from the side of the membrane 35
  • the end winding sections 130, 135 are wound in a counterclockwise direction, seen from the side of the membrane 35, and vice versa.
  • Such a winding is particularly advantageous since it makes it possible to exploit the magnetic field circulating in the end air gaps 86, 87 and the carcass 52 by using a single signal in the coil 25.
  • the ferrules 55, 60 have no internal flanges 61, 62 and the two magnets 65, 70 are set back radially relative to the central core 75 and relative to the first 80 and second 85 metal discs.
  • the second embodiment is however compatible with the ferrules 55, 60, with the magnets 65, 70 with the central core 75 and with the first 80 and second 85 metal discs of the first embodiment presented previously.
  • the end winding sections 130, 135 are at rest offset outwards, in a direction parallel to the axis A-A, from the end air gaps 86, 87.
  • the end winding sections 130, 135 are for example both offset away from the central core 75 relative to the air gaps 86, 87.
  • the end winding sections 130, 135 are offset from the end air gaps 86, 87 away from the central core 75.
  • offset it is meant here that the median planes of the end winding sections 130, 135 are offset with respect to the median planes of the air gaps 86, 87, the end winding sections 130, 135 extend for example, however, at least partially in the air gaps 86, 87.
  • Such an offset is particularly advantageous since it makes it possible to ensure linearity of the electromagnetic force applied by the coil 25 to the coil holder 30, the sum of the surfaces of the coil sections in the air gaps 77, 86 and 87 being substantially constant, whatever the position of the moving crew 5.
  • the extent along the axis AA of the end winding sections 130, 135 is for example different from the extent of the central winding section 31, and for example greater than the extent of the central winding section 31 (not shown on the figure 2 and 3 ).
  • the number of layers of wound wire forming the first 130 and the second 135 end winding sections is for example different from the number of layers forming the central winding section 31, and for example lower the number of layers forming the central winding section 31 (not shown in the figure 2 and 3 ).
  • FIG 4 is shown a detail of a variant of the loudspeaker 1, compatible with any one of the first, second and third embodiments previously described.
  • This variant differs from the variants of the first, second and third embodiments only in the following. Similar elements bear the same references.
  • the moving assembly 5 comprises a connection section 140 in place of the divergent 45.
  • the connection section 140 like the divergent, extends the tubular main body 32 of the spool holder, has a shape of revolution with an axis AA and is for example formed of injected plastic. It comprises a groove and the tubular main body 32 of the reel holder is embedded in the connection section 140.
  • connection section is tubular.
  • the complementary guide element 110 is in contact on the one hand with the protective cap 115 and on the other hand with the connection section 140. Unlike the variant of the embodiment presented in figure 1 , where the complementary guide element 110 extends radially towards the inside of the movable assembly 5, the guide element 110 extends, in the variant presented in figure 4 , radially towards the outside of the moving assembly 5.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
EP22176354.3A 2021-05-31 2022-05-31 Lautsprechermotor mit zwei entgegengesetzten magneten Pending EP4099717A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR2105683A FR3123533B1 (fr) 2021-05-31 2021-05-31 Moteur de Haut-parleur à deux aimants opposés

Publications (1)

Publication Number Publication Date
EP4099717A1 true EP4099717A1 (de) 2022-12-07

Family

ID=76730840

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22176354.3A Pending EP4099717A1 (de) 2021-05-31 2022-05-31 Lautsprechermotor mit zwei entgegengesetzten magneten

Country Status (4)

Country Link
US (1) US11979726B2 (de)
EP (1) EP4099717A1 (de)
CN (1) CN115484531A (de)
FR (1) FR3123533B1 (de)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999031931A1 (fr) * 1997-12-12 1999-06-24 Fan Zhang Haut-parleur
US7065225B2 (en) 2002-11-05 2006-06-20 Step Technologies, Inc. Electromagnetic transducer having a low reluctance return path
US20100296689A1 (en) * 2009-05-21 2010-11-25 Mark Pircaro Loudspeaker suspension
US20100316249A1 (en) * 2009-06-12 2010-12-16 Hosiden Corporation Speaker
US9774957B2 (en) * 2011-07-21 2017-09-26 Fan Zhang Multi-driver transducer having symmetrical magnetic circuit and symmetrical coil circuit

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999031931A1 (fr) * 1997-12-12 1999-06-24 Fan Zhang Haut-parleur
US7065225B2 (en) 2002-11-05 2006-06-20 Step Technologies, Inc. Electromagnetic transducer having a low reluctance return path
US20100296689A1 (en) * 2009-05-21 2010-11-25 Mark Pircaro Loudspeaker suspension
US20100316249A1 (en) * 2009-06-12 2010-12-16 Hosiden Corporation Speaker
US9774957B2 (en) * 2011-07-21 2017-09-26 Fan Zhang Multi-driver transducer having symmetrical magnetic circuit and symmetrical coil circuit

Also Published As

Publication number Publication date
FR3123533B1 (fr) 2023-12-08
US20220386032A1 (en) 2022-12-01
CN115484531A (zh) 2022-12-16
FR3123533A1 (fr) 2022-12-02
US11979726B2 (en) 2024-05-07

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