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EP4099717B1 - Lautsprechermotor mit zwei entgegengesetzten magneten - Google Patents

Lautsprechermotor mit zwei entgegengesetzten magneten Download PDF

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Publication number
EP4099717B1
EP4099717B1 EP22176354.3A EP22176354A EP4099717B1 EP 4099717 B1 EP4099717 B1 EP 4099717B1 EP 22176354 A EP22176354 A EP 22176354A EP 4099717 B1 EP4099717 B1 EP 4099717B1
Authority
EP
European Patent Office
Prior art keywords
speaker
central
membrane
magnetic circuit
mobile equipment
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.)
Active
Application number
EP22176354.3A
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English (en)
French (fr)
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EP4099717A1 (de
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
Application granted granted Critical
Publication of EP4099717B1 publication Critical patent/EP4099717B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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 frame 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 of opposite directions along the axis, aligned along this same axis and themselves placed between a first metal disk, and a second metal disk, the central core and at least one disk delimiting with the chassis 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 movable through the air gaps, the loudspeaker comprising a first element for guiding the movable assembly arranged between the movable assembly and the chassis on the membrane side relative to the magnetic circuit.
  • the document US 7065 225 B2 describes a loudspeaker comprising a magnetic circuit comprising two magnets of coaxial polarities and opposite directions and a central core placed between the two magnets, which are themselves placed between, on the one hand, a metal disk, and on the other hand, a yoke formed of an outer shell in the form of a ferrule closed at one end by a metal disk. The yoke surrounds the magnets, the central core and the metal disk, thus closing the magnetic circuit.
  • WO 99/31931 A1 features a speaker motor having two opposing magnets.
  • a coil is secured to a coil holder which is connected to the membrane, thus forming a moving assembly movable 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 guiding element of the moving assembly commonly called a suspension, connects the membrane to a flared housing commonly called a salad bowl.
  • the first and second guiding elements are placed on the same side of the magnetic circuit.
  • the aim of this invention is to provide a loudspeaker which allows improved guidance of the reel holder.
  • the invention relates to a loudspeaker as presented in claim 1.
  • 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 translational guidance of the moving assembly.
  • the loudspeaker is in accordance with claims 2 to 7.
  • the invention further relates to an audio apparatus according to claim 8.
  • the loudspeaker 1 comprises a chassis 3 comprising a magnetic circuit 4, and a mobile assembly 5 which can slide relative to the chassis 3 along an axis A-A.
  • the moving assembly 5 comprises a coil 25 secured to a revolution coil holder 30.
  • the coil holder 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 coil holder 30 and distributed over one or more layers.
  • the spool 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 comprises a groove 40.
  • the main body tubular 32 of the spool 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 mobile assembly 5 comprises a divergent part 45 extending the tubular main body 32 of the reel holder at its other end.
  • the divergent part has a shape of revolution of axis AA.
  • the divergent part 45 is for example formed from injected plastic. It comprises a groove 50, and the tubular main body 32 of the reel holder is embedded in the groove 50.
  • the reel holder body 30 is for example glued to the divergent part 45 in the divergent groove 50.
  • the free end of the divergent part 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 A-A 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 internal diameter.
  • An internal counterbore is thus provided for housing 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 frame 52.
  • the stack 63 comprises two magnets 65, 70, both in the form of a disk.
  • a light passes through the two magnets 65, 70, for example along the axis A-A.
  • the disk shape of the two magnets is then more particularly, according to this embodiment, a ring shape.
  • the disk 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.
  • Magnets 65 and 70 are for example ferrite magnets.
  • the stack 63 also comprises a central metal core of revolution of axis AA noted 75 placed between the magnets 65 and 70, in contact with them.
  • 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. At rest, the central winding section 31 alone forming 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 comparable to rings.
  • the two metal discs 80, 85 are solid.
  • the two metal discs 80, 85 are then comparable to trays.
  • the first metal disk 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 disk 85 and the central core 75, in contact with them.
  • the metal disks 80, 85 define, with the carcass 52, two air gaps 86, 87, hereinafter called end air gaps, of the magnetic circuit.
  • the metal discs 80, 85 are surrounded by the collars 61, 62 of the frame with which they form the two end air gaps 86, 87 of the magnetic circuit.
  • the chassis 3 comprises a central pillar 90 in contact with the second metal disk 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 a vase shape, the end in contact with the second metal disk 85 forming a widening collar with an 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 chassis 3 also includes a flared casing 93, commonly called a salad bowl, extending the first shell 55 on the side of the membrane 35.
  • the flared casing 93 widens in a direction opposite to the first shell 55 and receives the membrane 35 at its larger diameter open end.
  • the loudspeaker according to the invention comprises a guide element for the moving assembly on the side of the membrane 35, consisting of a suspension 105 in the form of an O-ring.
  • the suspension 105 is connected 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 suspension in section 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 relative to the magnetic circuit 4. It is formed of a corrugated seal. This type of seal is also called a "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 cross-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 chassis 3 includes a cover 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 length allow the movement of the complementary guide element 110 and of the mobile assembly 5 during operation of the loudspeaker 1.
  • Power supply wires 117, 118 are connected on either side of the coil 25.
  • the protective cover 115 on the one hand and the flared casing 93 on the other hand each have a passage hole 120, 125 for the power supply wires 117, 118, emerging on either side of the coil holder.
  • the coil 25 thus consists of an odd number of layers of wires.
  • a feed on either side of the coil 25 makes it possible to obtain a coil comprising an odd number of layers of wires.
  • the feed wires emerge from the same side of the coil.
  • the protective cover 115 then comprises the two passage holes for the feed wires 117, 118.
  • the magnetic field generated by the opposing magnets 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 moving assembly 5 generated by a current flowing in the central winding section 31 is of opposite direction in the air gaps 86 and 87 relative to the force generated by this same current in the central air gap 77.
  • the further the central winding section 31 moves away 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 increases. 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 chassis 3 and on the other hand to an element of the mobile assembly 5.
  • the guide elements hold the mobile assembly 5 at its two ends, on either side of the magnetic circuit 4. This position of the guide elements on the mobile assembly 5 makes it possible to guide the movement of the mobile assembly 5 in order to allow a movement mainly in translation parallel to the axis A-A and to prevent any rotation of the mobile assembly 5 relative to the rest of the loudspeaker 1.
  • FIG. 2 On the figure 2 is shown a detail of a second embodiment of the loudspeaker 1. This embodiment differs from the first embodiment only in the following. Similar elements bear the same references.
  • 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 coil 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 conductive wire, the sections being for example connected by unwound sections of the conductive 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 coil holder 35 is opposite to the winding direction of the central winding section 31 around the coil holder 35.
  • the central winding section 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 are devoid of internal collars 61, 62 and the two magnets 65, 70 are radially set back 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 previously presented.
  • FIG 3 On the figure 3 is shown a detail of a third embodiment of the loudspeaker 1. This embodiment differs from the second embodiment only in the following. Similar elements bear the same references.
  • end winding sections 130, 135 are at rest offset outwards, in a direction parallel to the axis A-A, of 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 is meant here that median planes of the end winding sections 130, 135 are offset relative 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 on 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 assembly 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 in the figures 2 And 3 ).
  • the number of layers of wound wire forming the first 130 and second 135 end winding sections is for example different from the number of layers forming the central winding section 31, and for example less than the number of layers forming the central winding section 31 (not shown in the figures 2 And 3 ).
  • FIG 4 is shown a detail of a variant of the loudspeaker 1, compatible with any 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 part 45.
  • the connection section 140 like the divergent part, extends the tubular main body 32 of the reel holder, has a shape of revolution of axis A-A 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 mobile assembly 5, the guide element 110 extends, in the variant presented in figure 4 , radially outwards from 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)

Claims (8)

  1. Lautsprecher (1), umfassend ein Gestell (3), umfassend einen Magnetkreis (4), der einerseits ein ringförmiges äußeres Metallgehäuse (52) um eine Achse (A-A) und andererseits einen Stapel (63), umfassend einen mittleren Metallkern (75), der zwischen einem ersten Magneten (65) und einen zweiten Magneten (70) mit entgegengesetzten Polaritäten entlang der Achse (A-A) angeordnet ist, die entlang dieser Achse ausgerichtet sind, aufweist und ihrerseits zwischen einer ersten Metallscheibe (80) und einer zweiten Metallscheibe (85) platziert sind, wobei der mittlere Kern (75) und mindestens eine Scheibe (80) mit dem Gehäuse einen Luftspalt (77, 86) begrenzen, der Lautsprecher (1) umfassend eine bewegliche Ausrüstung (5), die in Bezug auf den Magnetkreis (4) entlang der Achse (A-A) verlagerbar ist, wobei die bewegliche Ausrüstung (5) einen Spulenträger (30) aufweist, der eine Spule (25) und eine Membran (35) trägt, wobei der Spulenträger (30) beweglich durch die Luftspalte (77, 86) montiert ist, wobei der Lautsprecher (1) ein erstes Element (105) zur Führung der beweglichen Ausrüstung (5) aufweist, das zwischen der beweglichen Ausrüstung (5) und dem Gestell (3) auf der Seite der Membran in Bezug auf den Magnetkreis (4) angeordnet ist;
    wobei jede Metallscheibe (80, 85) mit dem Gehäuse (52) einen Endluftspalt (86, 87) begrenzt, die bewegliche Ausrüstung (5) den Magnetkreis (4) durch den Endluftspalt (86, 87) durchquert und der Lautsprecher (1) ein komplementäres Führungselement (110) aufweist, das zwischen der beweglichen Ausrüstung (5) und dem Gestell (3) auf der Seite gegenüber der Membran (35) in Bezug auf den Magnetkreis (4) angeordnet ist; wobei die Spule (25) einen mittleren Wicklungsabschnitt (31) und zwei Endwicklungsabschnitte (130, 135) umfasst, sich die Endwicklungsabschnitte (130, 135) im Ruhezustand jeweils zumindest teilweise durch einen Endluftspalt (86, 87) erstrecken; dadurch gekennzeichnet, dass,
    wenn der mittlere Wicklungsabschnitt (31) mit dem mittleren Luftspalt (77) ausgerichtet ist, die Endwicklungsabschnitte (130, 135) von den Endluftspalten (86, 87) weg von dem mittleren Kern (75) versetzt sind.
  2. Lautsprecher (1) nach Anspruch 1, der eine Schutzkappe (115) aufweist, die fest mit dem Metallgehäuse (52) verbunden ist und das komplementäre Führungselement (110) umgibt.
  3. Lautsprecher (1) nach Anspruch 1 oder 2, der einen mittleren Pfeiler (90) aufweist, der den Stapel (63) auf der Seite gegenüber der Membran (35) verlängert, wobei das komplementäre Führungselement (110) mit dem mittleren Pfeiler (90) verbunden ist.
  4. Lautsprecher (1) nach einem der vorherigen Ansprüche, wobei die bewegliche Ausrüstung (5) an ihrem Ende gegenüber der Membran (35) eine Divergenz (45) aufweist, deren Querschnitt an ihrem Ende gegenüber der Membran (35) zunimmt, wobei das komplementäre Führungselement (110) mit dem Ende großen Durchmessers der Divergenz (45) verbunden ist.
  5. Lautsprecher (1) nach einem der vorherigen Ansprüche, wobei das Metallgehäuse (52) einen ersten Ring (55) und einen zweiten Ring (60) aufweist, die koaxial sind und Ende an Ende in Verlängerung zueinander angeordnet sind.
  6. Lautsprecher (1) nach einem der vorherigen Ansprüche, wobei die Spule (25) durch Versorgungsdrähte (117, 118) verlängert ist, die durch die von den zwei Metallscheiben (80, 85) begrenzten Luftspalte (86, 87) verlaufen.
  7. Lautsprecher (1) nach einem der vorherigen Ansprüche, wobei der Innendurchmesser des Gehäuses (52) in einer beliebigen Ebene senkrecht zu der Achse (A-A) an seinen zwei Enden kleiner ist als in seinem mittleren Bereich.
  8. Audiogerät, umfassend einen Lautsprecher (1) nach einem der vorherigen Ansprüche.
EP22176354.3A 2021-05-31 2022-05-31 Lautsprechermotor mit zwei entgegengesetzten magneten Active EP4099717B1 (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 (2)

Publication Number Publication Date
EP4099717A1 EP4099717A1 (de) 2022-12-07
EP4099717B1 true EP4099717B1 (de) 2025-01-08

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Application Number Title Priority Date Filing Date
EP22176354.3A Active EP4099717B1 (de) 2021-05-31 2022-05-31 Lautsprechermotor mit zwei entgegengesetzten magneten

Country Status (4)

Country Link
US (1) US11979726B2 (de)
EP (1) EP4099717B1 (de)
CN (1) CN115484531A (de)
FR (1) FR3123533B1 (de)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1219834A (zh) * 1997-12-12 1999-06-16 张凡 扬声器
US6940992B2 (en) 2002-11-05 2005-09-06 Step Technologies Inc. Push-push multiple magnetic air gap transducer
US8290199B2 (en) * 2009-05-21 2012-10-16 Bose Corporation Loudspeaker suspension
JP2010288099A (ja) * 2009-06-12 2010-12-24 Hosiden Corp スピーカ
CN102892063B (zh) * 2011-07-21 2018-05-01 张凡 具有对称磁路及对称线圈电路的多驱动器换能器

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Publication number Publication date
FR3123533A1 (fr) 2022-12-02
US11979726B2 (en) 2024-05-07
CN115484531A (zh) 2022-12-16
EP4099717A1 (de) 2022-12-07
FR3123533B1 (fr) 2023-12-08
US20220386032A1 (en) 2022-12-01

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