WO2022166379A1 - Unité de production sonore - Google Patents

Unité de production sonore Download PDF

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Publication number
WO2022166379A1
WO2022166379A1 PCT/CN2021/136290 CN2021136290W WO2022166379A1 WO 2022166379 A1 WO2022166379 A1 WO 2022166379A1 CN 2021136290 W CN2021136290 W CN 2021136290W WO 2022166379 A1 WO2022166379 A1 WO 2022166379A1
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WO
WIPO (PCT)
Prior art keywords
magnetic
sound
conductive diaphragm
side wall
diaphragm
Prior art date
Application number
PCT/CN2021/136290
Other languages
English (en)
Chinese (zh)
Inventor
王苗苗
郭晓冬
Original Assignee
歌尔股份有限公司
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 歌尔股份有限公司 filed Critical 歌尔股份有限公司
Publication of WO2022166379A1 publication Critical patent/WO2022166379A1/fr

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    • 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
    • H04R31/00—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor
    • H04R31/003—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor for diaphragms or their outer suspension
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/04—Plane diaphragms
    • 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
    • H04R2209/00—Details of transducers of the moving-coil, moving-strip, or moving-wire type covered by H04R9/00 but not provided for in any of its subgroups
    • H04R2209/024—Manufacturing aspects of the magnetic circuit of loudspeaker or microphone transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2231/00—Details of apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor covered by H04R31/00, not provided for in its subgroups
    • H04R2231/001—Moulding aspects of diaphragm or surround
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2307/00—Details of diaphragms or cones for electromechanical transducers, their suspension or their manufacture covered by H04R7/00 or H04R31/003, not provided for in any of its subgroups
    • H04R2307/027—Diaphragms comprising metallic materials

Definitions

  • the invention relates to the technical field of electro-acoustic conversion, in particular to a sound-generating monomer.
  • Micro-speakers are often required to be installed in existing electronic devices, and most of the existing micro-speakers are energized through the voice coil, so that the voice coil moves in the gap, so that the voice coil drives the diaphragm to vibrate. During the vibrating and sounding process of the diaphragm, the voice coil and the diaphragm move together, resulting in large vibration quality, poor high-frequency sound quality, and low electro-acoustic conversion efficiency.
  • the main purpose of the present invention is to provide a sound-generating unit, which aims to solve at least one technical problem in the existing speaker structure.
  • the sound-generating unit includes a housing with an accommodation space, a magnetic conductive diaphragm and two magnetic circuit systems arranged in the accommodation space, and the two magnetic circuit systems are relatively spaced apart. set, the edge of the magnetic conductive diaphragm is fixed with the casing to be suspended between the two magnetic circuit systems, and the magnetic conductive diaphragm is used to act on the alternating electromagnetic field generated by the magnetic circuit system vibrate down to make a sound.
  • the magnetic circuit system includes a magnetic steel attached to the housing and a coil arranged around the magnetic steel.
  • the magnetization directions of the magnetic steels of the two magnetic circuit systems are the same, and the current directions of the coils of the two magnetic circuit systems are opposite.
  • the housing includes a first magnetic yoke and a second magnetic yoke that cooperate to form the receiving space, and the magnetic conductive diaphragm is disposed between the first magnetic yoke and the second magnetic yoke;
  • the two magnetic circuit systems are respectively disposed in the space surrounded by the first magnetic yoke and the magnetically conductive diaphragm, and in the space surrounded by the second magnetic yoke and the magnetically conductive diaphragm.
  • the first yoke includes a top wall and a first side wall extending from the top wall
  • the second yoke includes a bottom wall and a second side wall extending from the bottom wall
  • two In the magnetic circuit system the magnetic steel of one of the magnetic circuit systems is arranged on the top wall and forms a first gap with the first side wall, and the magnetic steel of the other magnetic circuit system is arranged on the top wall.
  • a second gap is formed between the bottom wall and the second side wall, and the two coils are respectively arranged in the first gap and the second gap.
  • first side wall and the second side wall respectively fix the magnetic conductive diaphragm from opposite sides of the magnetic conductive diaphragm.
  • the thicknesses of the bottom wall and the top wall are both smaller than the thickness of the first side wall or the thickness of the second side wall.
  • the first side wall and/or the second side wall is provided with a sound outlet that communicates with the receiving space.
  • the magnetic steel is provided with an air flow channel with an opening facing the magnetic conducting diaphragm, the bottom wall and the top wall are respectively provided with sound outlet holes communicating with the air flow channel, and the magnetic circuit system It also includes a sound transmission magnet arranged in the air flow channel, and a plurality of pore structures are distributed in the sound transmission magnet.
  • the magnetic conductive diaphragm is a planar magnetic conductive diaphragm.
  • the present invention also provides an earphone, the earphone includes the above-mentioned sound generating unit.
  • the energization of the coil can be controlled, so that the magnetic circuit system can generate an alternating electromagnetic field, and the magnetic conductive diaphragm can vibrate in the vibration space under the action of the alternating electromagnetic field, saving energy.
  • the voice coil connected with the diaphragm so that only the magnetic conductive diaphragm vibrates, and the vibration components to be driven by the magnetic circuit system are of small mass, which can improve the high-frequency performance, and can improve the sound-electric conversion efficiency;
  • the membrane is directly connected with the housing, which facilitates the assembly of the sound-emitting unit, and at the same time helps to improve the conversion efficiency of sound and electricity.
  • FIG. 1 is a schematic cross-sectional structure diagram of an embodiment of a sounding monomer of the present invention
  • FIG. 2 is a schematic diagram of the disassembled structure of an embodiment of the sounding monomer of the present invention
  • FIG. 3 is a schematic diagram of the force analysis of the coil of an embodiment of the present invention when the coil is not energized;
  • FIG. 4 is a schematic diagram of force analysis when the coil of an embodiment of the sounding monomer of the present invention is energized
  • FIG. 5 is a schematic diagram of a disassembled structure of an embodiment of a sounding monomer of the present invention.
  • FIG. 6 is a schematic cross-sectional structure diagram of another embodiment of the sounding monomer of the present invention.
  • FIG. 7 is a schematic cross-sectional structure diagram of another embodiment of the sounding monomer of the present invention.
  • FIG. 8 is a schematic diagram of the magnetic field distribution when the casing of an embodiment of the sounding unit of the present invention is a non-magnetic conductive material
  • FIG. 9 is a schematic diagram of the magnetic field distribution of another embodiment of the generating unit according to the present invention, where the casing is a magnetic conductive material.
  • label name label name 10 sounding unit 1 case 11 first yoke 111 top wall 113 first side wall 12 sound hole 13 second yoke 131 bottom wall 133 second side wall 3 Magnetic diaphragm 5 Magnetic circuit system 51 magnetic steel 52 airflow channel 53 coil 55 sound transmission magnet 15 Mounting table
  • the present invention provides a sound-generating unit 10 .
  • the technical solution of the present invention proposes a sound-generating unit 10, the sound-generating unit 10 includes a housing 1 with a receiving space, a magnetic conductive diaphragm 3 and two magnetic circuit systems 5 arranged in the receiving space, The two magnetic circuit systems 5 are relatively spaced apart, and the edge of the magnetic conductive diaphragm 3 is fixed to the housing 1 to be suspended between the two magnetic circuit systems. Vibration and sound under the action of electromagnetic field.
  • the voice coil is connected to the diaphragm, and the voice coil is inserted into the magnetic gap. After the voice coil is energized, under the action of the magnetic field, the voice coil reciprocates in the magnetic gap to push the diaphragm to vibrate.
  • the voice coil connected to the magnetically conductive diaphragm 3 is not provided in the present invention.
  • the edge of the magnetic conductive diaphragm 3 is directly connected to the housing 1, avoiding other fixing structures, and there are fewer parts, thus facilitating product assembly.
  • the edge of the magnetic conductive diaphragm 3 can be directly connected to the smooth inner wall of the housing 1 , or structures such as mounting grooves and protrusions can be provided on the housing 1 to facilitate the magnetic conductive diaphragm 3 to be fixed and suspended at a preset position. Since the magnetic conductive diaphragm 3 is directly fixed through the housing 1, no other fixing components are provided between the magnetic conductive diaphragm 3 and the magnetic circuit system 5, and the magnetic field distribution between the magnetic conductive diaphragm 3 and the magnetic circuit system 5 is not affected by other fixed components. Due to the influence of the fixed components, no separate component is required to support the magnetic circuit system 5, which can reduce the gap between the magnetic conductive diaphragm 3 and the magnetic circuit system 5, which is beneficial to improve the acousto-electrical conversion efficiency.
  • the energization of the coil 53 can be controlled, so that the magnetic circuit system 5 generates an alternating electromagnetic field, and the magnetic conductive diaphragm 3 is in the alternating electromagnetic field.
  • the present invention facilitates the assembly of the sound-generating unit 10 by directly connecting the magnetic conductive diaphragm 3 to the housing 1, and at the same time helps to improve the acousto-electrical conversion efficiency.
  • the magnetic circuit system 5 includes a magnetic steel 51 attached to the casing 1 and a coil 53 arranged around the magnetic steel 51 .
  • the magnetic conductive diaphragm 3 is only affected by the magnetic field generated by the magnetic steel 51 located on both sides.
  • the magnetic size and shape of the two magnetic steels 51 can be controlled. etc., so that the magnetic conductive diaphragm 3 can remain stationary at a preset position in the vibration space.
  • the coils 53 located on both sides of the magnetic conductive diaphragm 3 are energized, the two coils 53 interact to generate an alternating electromagnetic field, so that the magnetic conductive diaphragm 3 is vibrated by the driving force to produce sound.
  • the present invention arranges the coil 53 around the magnetic steel 51, so that in the magnetic field generated by the magnetic circuit system 5, the intensity of the permanent magnetic field in the central region is compared with that in the edge region.
  • the strength of the permanent magnetic field is greater.
  • the magnetic field strength of the alternating magnetic field experienced by the central region of the magnetic permeable diaphragm 3 is greater than the magnetic field strength of the alternating magnetic field received by the edge region of the magnetic permeable diaphragm 3.
  • the magnetic permeability The driving force received by the central area of the diaphragm 3 is greater than the driving force received by the edge area of the magnetic conductive diaphragm 3, so that the magnetic conductive diaphragm 3 is more easily affected by the alternating electromagnetic field to generate sound and vibrate.
  • the magnetic steel 51 , the coil 53 and the balance diaphragm are coaxially arranged to facilitate vibration balance.
  • the magnetization directions of the magnets 51 of the two magnetic circuit systems 5 are the same, and the current directions of the coils 53 of the two magnetic circuit systems 5 are opposite.
  • FIG. 3 is a force analysis diagram of the magnetic conductive diaphragm 3 in an embodiment when the coil 53 is not energized
  • FIG. 4 is a magnetic conductive vibration in an embodiment when the coil 53 is energized Force analysis diagram of membrane 3.
  • FIG. 3 is a force analysis diagram of the magnetic conductive diaphragm 3 in an embodiment when the coil 53 is not energized
  • FIG. 4 is a magnetic conductive vibration in an embodiment when the coil 53 is energized
  • Force analysis diagram of membrane 3 In the embodiment shown in FIG.
  • the magnetic steel 51 located above the magnetic conductive diaphragm 3 and the magnetic steel 51 located below the magnetic conductive diaphragm 3 are both N-pole at the upper end and S-pole at the lower end, that is, the magnetic steel 51 has a
  • the magnetization direction is the same, the direction of the magnetic field line is from the N pole to the S pole, and the magnetic field line is the direction shown by the arrow in the figure because of the magnetic permeability of the magnetic permeable diaphragm 3 . Since the magnetic conductive diaphragm 3 is subjected to opposite directions of the magnetic forces of the two magnetic steels 51 , the magnetically conductive diaphragm 3 can be suspended between the two magnetic steels 51 in a balanced manner.
  • the magnetic steel 51 located above the magnetic conductive diaphragm 3 and the magnetic steel 51 located below the magnetic conductive diaphragm 3 are both N-pole at the upper end and S-pole at the lower end, and are located at the upper magnetic steel at the same time.
  • the current direction of the coil 53 outside 51 is left in and right out, and the current direction of the coil 53 outside the lower magnetic steel 51 is right in and left out, that is, the current directions of the two coils 53 are opposite.
  • Ampere's law it is determined that the upper end of the coil 53 above the magnetic conductive diaphragm 3 is the S pole and the lower end is the N stage, and the coil 53 located below the magnetic conductive diaphragm 3 is determined.
  • the opposite sides of the magnetic conductive diaphragm 3 are magnetized by the upper magnetic steel 51 and the lower magnetic steel 51 to generate polarity.
  • the upper side of the magnetic conductive diaphragm 3 is the N pole, and the lower side is the S pole; the lower end of the upper coil 53 is the N pole.
  • the upper end of the lower coil 53 is N pole and the lower side of the magnetic conductive diaphragm 3 attracts the opposite sex, so that under the action of the two superimposed forces, the magnetic conductive diaphragm 3 moves toward the upper side of the magnetic conductive diaphragm 3.
  • the lower deformation generates vibration, thereby further improving the electro-acoustic conversion efficiency of the sound-generating unit 10 .
  • the electromagnetic force F ⁇ pushes the magnetic conductive diaphragm 3 to move toward the lower magnetic circuit system 5 .
  • the current direction of the coil 53 above and below the magnetic conductive diaphragm 3 is the opposite direction as shown in FIG.
  • the magnetic conductive diaphragm 3 is subjected to the magnetic flux of the upper magnetic circuit system 5 ⁇ 1 ′>magnetic conductive vibration
  • the electromagnetic force generated by the magnetic circuit system 5 pushes the magnetic conductive diaphragm 3 to move closer to the upper magnetic circuit system 5 , so that the magnetic conductive diaphragm 3 can be controlled to vibrate and sound by controlling the current in the coil 53 .
  • the magnetic field distribution has obvious magnetic flux leakage, and the magnetic field lines diverge to the outside of the sound generating unit 10 more, which affects the electro-acoustic conversion efficiency.
  • the housing 1 includes a first magnetic yoke 11 and a second magnetic yoke 13 that cooperate to form a receiving space, and the magnetic conductive diaphragm 3 is arranged between the first magnetic yoke 11 and the second magnetic yoke 13 ,
  • the two magnetic circuit systems 5 are respectively disposed in the space surrounded by the first magnetic yoke 11 and the magnetically conductive diaphragm 3 and in the space surrounded by the second magnetic yoke 13 and the magnetically conductive diaphragm 3 .
  • the first magnetic yoke 11 and the second magnetic yoke 13 are magnetic conductive parts, and the magnetic conductive diaphragm 3 is in direct contact with the magnetic conductive housing 1.
  • the magnetic circuit is more concentrated and complete, which is beneficial to improve the electro-acoustic conversion. efficiency.
  • the first magnetic yoke 11 includes a top wall 111 and a first side wall 113 extending from the top wall 111
  • the second magnetic yoke 13 includes a bottom wall 131 and a second side wall 133 extending from the bottom wall 131;
  • the magnetic steel 51 of one magnetic circuit system 5 is arranged on the top wall 111 and forms a first gap with the first side wall 113
  • the magnetic steel 51 of the other magnetic circuit system 5 is arranged on the bottom wall 131
  • a second gap is formed between it and the second side wall 133.
  • the two coils 53 are respectively arranged in the first gap and the second gap.
  • the second side wall 133 , the other coil 53 and the other magnetic steel 51 are sequentially sleeved.
  • the magnetic steel 51 can be directly attached to the top wall 111 or the bottom wall 113 , while the coil 53 can be wound on the magnetic steel 51 , or can be pre-wound and attached to the top wall 111 or the bottom wall 113 .
  • the components of the magnetic circuit system 5 are set in sequence, thereby effectively reducing the size of the sounding unit 10 .
  • the first side wall 113 and the second side wall 133 respectively fix the magnetic conductive diaphragm 3 from opposite sides of the magnetic conductive diaphragm 3, that is, the edge of the magnetic conductive diaphragm 3 can be fixed by glue, welding, etc. It is arranged at the end of the first side wall 113 or the second side wall 133 , and then the first magnetic yoke 11 and the second magnetic yoke 13 are fixed together with the cover, so as to facilitate product assembly.
  • the thicknesses of the bottom wall 131 and the top wall 111 are both smaller than the thickness of the first side wall 113 or the thickness of the second side wall 133 .
  • the thickness of the bottom wall 131 and the thickness of the top wall 111 are both perpendicular to the direction of the magnetic conductive diaphragm 3
  • the thickness of the first side wall 113 and the thickness of the second side wall 133 are both perpendicular to the direction of the airflow channel 52 .
  • the magnetic steel 51 has an air flow channel 52 with an opening facing the magnetic conductive diaphragm 3 , and the bottom wall 131 and the top wall 111 are respectively provided with sound outlet holes 12 communicating with the air flow channel 52 .
  • the sound outlet 12 By opening the sound outlet 12, it is beneficial to maintain the air pressure balance in the accommodation space, which is beneficial to the vibration of the magnetic conductive diaphragm 3 in the accommodation space, and the airflow pushed by the magnetic conductive diaphragm 3 can be transmitted to the air through the air passage 52 and the sound outlet 12. external.
  • the magnetic circuit system 5 further includes a sound-transmitting magnet 55 disposed in the airflow channel 52 , and a plurality of pore structures are distributed in the sound-transmitting magnet 55 .
  • the sound-transmitting magnet 55 is a magnetic-conducting member, which can increase the magnetic permeability of the magnetic circuit system 5. Due to the distribution of the pore structure, the air in the accommodation space can be communicated with the outside through the pore structure, and the airflow pushed by the magnetic-conducting diaphragm 3 is still It can be transmitted to the outside through the pore structure.
  • the magnetic steel 51 and the sound-transmitting magnet 55 are separately provided components, and the sound-transmitting magnet 55 may be foamed iron-nickel. In other embodiments, the magnetic steel 51 and the sound-transmitting magnet 55 may also be integrally formed.
  • the first side wall 113 and/or the second side wall 133 are provided with sound outlet holes 12 communicating with the receiving space.
  • the sound outlet 12 is provided on the first side wall 113 and/or the second side wall 133 , and the magnetic steel 51 may not be provided with the airflow channel 52 .
  • the magnetic conductive diaphragm 3 is a planar magnetic conductive diaphragm.
  • the planar magnetic conductive diaphragm 3 provided in the present invention can reduce the size of the sounding unit 10 .
  • the magnetic conductive diaphragm 3 includes a metal body, and the metal body includes one or more of stainless steel S430, silicon steel, SPCC, iron-nickel alloy, iron-cobalt-vanadium alloy, and soft ferrite.
  • the metal body vibrates, the sound quality emitted has a metallic texture.
  • the magnetic conductive diaphragm 3 may also include a damping layer disposed on the metal body, and the damping layer may be an adhesive film layer, PEEK, TPU, TPEE, or the like.
  • the damping property of the magnetic conductive diaphragm 3 can be adjusted through the damping layer, which is beneficial to the balance of the vibration of the magnetic conductive diaphragm 3 and brings a more delicate hearing sense.
  • the magnetic conductive diaphragm 3 includes a substrate and a magnetic conductive layer disposed on the substrate, the substrate is any one of metal or non-metal, elastomer or non-elastomeric body, and the magnetic conductive layer is nickel , iron-nickel alloy, iron-phosphorus alloy and other powders with soft magnetic properties are arranged on the substrate by plating, deposition, magnetron sputtering, etc.
  • the thickness of the magnetic conductive diaphragm 3 is 10-40um.

Abstract

L'invention concerne une unité de production sonore, comprenant un boîtier présentant un espace de réception, et une membrane magnétiquement conductrice et deux systèmes de circuit magnétique qui sont disposés dans l'espace de réception, les deux systèmes de circuit magnétique étant disposés à l'opposé l'un de l'autre et espacés l'un de l'autre, un bord de la membrane magnétiquement conductrice est fixé au boîtier de manière à être suspendu entre les deux systèmes de circuit magnétique, et la membrane magnétiquement conductrice est utilisée pour vibrer afin de produire un son sous l'action d'un champ électromagnétique alternatif généré par les systèmes de circuit magnétique. L'unité de production sonore décrite dans la présente invention est pratique à assembler et présente une efficacité de conversion électroacoustique élevée.
PCT/CN2021/136290 2021-02-02 2021-12-08 Unité de production sonore WO2022166379A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202110143949.7A CN112770237B (zh) 2021-02-02 2021-02-02 发声单体
CN202110143949.7 2021-02-02

Publications (1)

Publication Number Publication Date
WO2022166379A1 true WO2022166379A1 (fr) 2022-08-11

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CN (1) CN112770237B (fr)
WO (1) WO2022166379A1 (fr)

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CN112770237B (zh) * 2021-02-02 2023-01-24 歌尔股份有限公司 发声单体
CN112770236A (zh) * 2021-02-02 2021-05-07 歌尔股份有限公司 发声单体
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Publication number Priority date Publication date Assignee Title
CN117381162A (zh) * 2023-12-13 2024-01-12 天津海星辉科技有限公司 一种耳机振膜组装焊接装置以及焊接方法
CN117381162B (zh) * 2023-12-13 2024-03-19 昆山海菲曼科技集团股份有限公司 一种耳机振膜组装焊接装置以及焊接方法

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