WO2024022489A1 - Appareil de production de son et dispositif terminal - Google Patents

Appareil de production de son et dispositif terminal Download PDF

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Publication number
WO2024022489A1
WO2024022489A1 PCT/CN2023/109841 CN2023109841W WO2024022489A1 WO 2024022489 A1 WO2024022489 A1 WO 2024022489A1 CN 2023109841 W CN2023109841 W CN 2023109841W WO 2024022489 A1 WO2024022489 A1 WO 2024022489A1
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WO
WIPO (PCT)
Prior art keywords
magnetic circuit
groove
circuit part
sound
generating device
Prior art date
Application number
PCT/CN2023/109841
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English (en)
Chinese (zh)
Inventor
高岩
李世田
张凯
张迪
Original Assignee
潍坊歌尔丹拿电子科技有限公司
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Application filed by 潍坊歌尔丹拿电子科技有限公司 filed Critical 潍坊歌尔丹拿电子科技有限公司
Publication of WO2024022489A1 publication Critical patent/WO2024022489A1/fr

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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
    • H04R9/06—Loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02—Details
    • 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

Definitions

  • the present invention relates to the technical field of electroacoustic conversion, and in particular to a sound-generating device and terminal equipment using the sound-generating device.
  • a horn also known as a loudspeaker, is an electroacoustic transducer that converts electrical energy into sound energy through a certain physical effect.
  • the voice coil When different electronic energies are transmitted to the voice coil of the speaker, the voice coil generates an energy that interacts with the magnetic field of the magnet. This interaction causes the diaphragm to vibrate. Because the electronic energy changes at any time, the voice coil of the speaker will move forward or backward. , so the diaphragm of the speaker will follow the movement. This movement changes the density of the air and produces sound.
  • the washers of speakers are mostly cylindrical or annular, and are bonded to magnets through glue, and together with U iron or T iron form the magnetic circuit system of the speaker.
  • the washer plays a magnetic conductive role and forms a magnetic circuit with the U iron or T iron and the magnet, so that the energized voice coil moves to cut the magnetic field lines and drive the diaphragm to vibrate and produce sound.
  • the magnetic permeability of some areas of the disk-shaped or annular washer is very low. Retaining the low magnetic permeability area causes the weight of the washer to increase, which cannot meet the design requirements of miniaturization and lightweight, and there are inconsistencies in BL value and linear range. Good question.
  • the main purpose of the present invention is to provide a sound-generating device and terminal equipment, aiming to provide a sound-generating device that ensures good BL value and linear range.
  • the sound-generating device not only effectively reduces the weight, but also ensures good BL value and linear range. It can also meet the design requirements of miniaturization and lightweight.
  • the present invention proposes a sound-generating device, which includes:
  • a basin frame the basin frame is provided with a cavity open at both ends;
  • the magnetic circuit system includes a U iron, an inner magnetic circuit part and an outer magnetic circuit part, the U iron has a receiving slot, the inner magnetic circuit part is arranged in the receiving slot, the U iron The end surface of the iron adjacent to the notch of the accommodating groove forms a supporting surface.
  • the external magnetic circuit part is provided on the supporting surface and is connected to the basin frame. The external magnetic circuit part cooperates with the U iron to cover The opening of one end of the cavity is closed, the side wall of the accommodation groove and the outer magnetic circuit part are spaced apart from the inner magnetic circuit part to form a magnetic gap, and the inner magnetic circuit part faces one side of the magnetic gap. Notched slots are provided on the sides; and
  • the vibration system includes a diaphragm and a voice coil connected to the diaphragm, the diaphragm Connected to the basin frame and covering the opening at the other end of the cavity, one end of the voice coil away from the diaphragm is suspended in the magnetic gap.
  • the inner magnetic circuit part includes a stacked inner magnet and an inner washers, and the inner magnets are sandwiched between the inner washers and the bottom wall of the accommodating groove.
  • the notch groove is provided on the side of the washer facing the magnetic gap;
  • the outer magnetic circuit part includes stacked outer magnets and outer washers.
  • the outer magnets are sandwiched between the outer washers and the support surface.
  • the outer washers are connected to the basin frame.
  • a recessed groove is provided on a side of the Nevas facing away from the inner magnet.
  • the thickness of the inner magnet is defined as h1
  • the thickness of the outer magnet is defined as h2, where 0.8 ⁇ h1/h2 ⁇ 1.2;
  • the cross section of the recessed groove is semicircular, the radius of the recessed groove is defined as R, the maximum thickness of the inner wall is defined as t1, and the radius of the inner wall is defined as d1, where, t1 ⁇ R ⁇ d1.
  • the notch groove extends along the periphery of the Nevas
  • the notch groove is provided adjacent to the inner magnet
  • the outer washer is provided with a limiting protrusion on a side facing away from the magnetic gap
  • the basin is provided with a limiting groove
  • the limiting protrusion is accommodated and limited in the limiting groove.
  • the inner magnetic circuit part further includes a short-circuit ring, and the short-circuit ring includes a first section and a second section arranged at an angle, and the first section is away from the Newasi and the One side of the inner magnet is connected, and the second section is attached to the side of the Newas facing the magnetic gap and extends to the inner magnet to cover the notch.
  • the length of the notch groove along the axis of the magnetic gap is defined as a, and the length of the notch groove along the direction perpendicular to the axis of the magnetic gap is defined as b; where, 1.8 ⁇ a/b ⁇ 2.2.
  • a boss is protruding from the bottom wall of the accommodating groove.
  • the boss is spaced from the side wall of the accommodating groove and encloses a relief groove that communicates with the accommodating groove.
  • the escape groove corresponds to the magnetic gap, and the inner magnetic circuit is partially supported on the boss;
  • a groove is recessed on the side of the U-iron back toward the opening of the accommodating groove.
  • the vibration system further includes a centering ring.
  • the inner side of the centering ring is connected to the outer wall of the voice coil.
  • the basin frame is protrudingly provided with a fixing platform.
  • the outer side of the centering ring is connected to the outer wall of the voice coil.
  • the U iron extends adjacent to the support surface toward a side away from the accommodation groove to form a support platform, the support platform is flush with the support surface, and the external magnetic circuit part is supported on the support surface and said support platform.
  • the present invention also provides a terminal device, which includes an equipment housing and the above-mentioned sound-generating device, and the sound-generating device is provided in the equipment housing.
  • the sound-generating device of the technical solution of the present invention sets up a cavity with openings at both ends in the basin frame, thereby using the basin frame to install, fix and protect the magnetic circuit system and the vibration system.
  • the magnetic circuit system is configured as a U iron and an inner magnetic circuit part.
  • the outer magnetic circuit part use the U-iron holding slot to install and fix the inner magnetic circuit part, and set the outer magnetic circuit part on the supporting surface of the U-iron, so that the inner magnetic circuit part is in contact with the side wall of the U-iron holding groove.
  • the outer magnetic circuit partially encloses a magnetic gap for the voice coil of the vibration system to be suspended.
  • the voice coil moves to cut the magnetic field lines in the magnetic gap of the magnetic circuit system, thereby driving the diaphragm to vibrate and produce sound; through There is a notch groove on the side of the inner magnetic circuit facing the magnetic gap, thereby eliminating the low magnetic permeability part of the inner magnetic circuit part to reduce the weight of the inner magnetic circuit part and making full use of the high magnetic permeability part of the inner magnetic circuit part. , to ensure good BL value and linear range of the sound-generating device, while also meeting the design requirements of miniaturization and lightweight.
  • Figure 1 is a schematic cross-sectional view of a sound-generating device according to an embodiment of the present invention
  • Figure 2 is a schematic cross-sectional view of the magnetic circuit system in one embodiment of the present invention.
  • Figure 3 is a schematic cross-sectional view of the magnetic circuit system in one embodiment of the present invention.
  • Figure 4 is an enlarged schematic diagram of a partial cross-section of the magnetic circuit system in one embodiment of the present invention.
  • Figure 5 is a schematic cross-sectional view of U iron in an embodiment of the present invention.
  • Figure 6 is a schematic diagram of simulated magnetic field lines of part of the magnetic circuit system in an embodiment of the present invention.
  • Figure 7 is a schematic diagram of simulated magnetic field lines of part of the magnetic circuit system in the prior art.
  • Figure 8 is a BL curve diagram of the sound-generating device in one embodiment of the present invention and the prior art.
  • a horn also known as a loudspeaker, is an electroacoustic transducer that converts electrical energy into sound energy through a certain physical effect.
  • the voice coil When different electronic energies are transmitted to the voice coil of the speaker, the voice coil generates an energy that interacts with the magnetic field of the magnet. This interaction causes the diaphragm to vibrate. Because the electronic energy changes at any time, the voice coil of the speaker will move forward or backward. , so the diaphragm of the speaker will follow the movement. This movement changes the density of the air and produces sound.
  • the washers of speakers are mostly cylindrical or annular, and are bonded to magnets through glue, and together with U iron or T iron form the magnetic circuit system of the speaker.
  • the washer plays a magnetic conductive role and forms a magnetic circuit with the U iron or T iron and the magnet, so that the energized voice coil moves to cut the magnetic field lines and drive the diaphragm to vibrate and produce sound.
  • the magnetic permeability of some areas of the disk-shaped or annular washer is very low. Retaining the low magnetic permeability area causes the weight of the washer to increase, which cannot meet the design requirements of miniaturization and lightweight, and there are inconsistencies in BL value and linear range. Good question.
  • the present invention proposes a sound-generating device 100. It can be understood that the sound-generating device 100 is applied to terminal equipment, and the terminal equipment may be a speaker, a car speaker, etc., which is not limited here.
  • the sound-generating device 100 includes a basin frame 1 , a magnetic circuit system 2 and a vibration system 3 .
  • the basin frame 1 is provided with a cavity 11 open at both ends.
  • the magnetic circuit system 2 includes a U iron 21, an inner magnetic circuit part 22 and an outer magnetic circuit part 23.
  • the U iron 21 has an accommodating slot 211
  • the inner magnetic circuit part 22 is arranged in the accommodating slot 211
  • the U iron 21 is adjacently accommodated.
  • the end surface of the groove 211 forms a supporting surface 212.
  • the external magnetic circuit part 23 is located on the supporting surface 212 and is connected to the basin frame 1.
  • the external magnetic circuit part 23 and the U iron 21 cooperate to cover the opening at one end of the cavity 11.
  • the side wall of the groove 211 and the outer magnetic circuit part 23 are spaced apart from the inner magnetic circuit part 22 to form a magnetic gap 24.
  • the inner magnetic circuit part 22 is provided with a notch groove 2221 on the side facing the magnetic gap 24.
  • the vibration system 3 includes a diaphragm 31 and a voice coil 32 connected to the diaphragm 31.
  • the diaphragm 31 is connected to the basket 1 and covers the opening at the other end of the cavity 11.
  • the voice coil 32 is away from the diaphragm.
  • One end of 31 is suspended in the magnetic gap 24.
  • the basin frame 1 is used to install, fix, support and protect the vibration system 3, the magnetic circuit system 2 and other components, that is, the basin frame 1 provides an installation foundation for the vibration system 3, the magnetic circuit system 2 and other components.
  • the basin frame 1 can be a mounting shell, a casing, a box or other structure having a cavity 11, that is, the basin frame 1 defines a receiving space, which is not limited here.
  • the basin frame 1 can be selected as a cylindrical, square or horn-shaped structure.
  • the cavity 11 of the basin frame 1 may be a cavity structure with one end open, or of course, a cavity structure with both ends open.
  • the basin frame 1 may be a trumpet-shaped or basin-shaped structure open at both ends.
  • the basin frame 1 is a columnar or basin-shaped structure with openings at both ends.
  • the magnetic circuit system 2 is located at the opening at one end of the basin frame 1.
  • the magnetic circuit system 2 includes a U iron 21, an inner magnetic circuit part 22 and an outer magnetic circuit part 23.
  • the U iron 21 is arranged in a U shape.
  • the U iron 21 has an accommodating groove 211 with one end open.
  • the iron 21 is arranged at the opening of one end of the basin frame 1.
  • the accommodating groove 211 of the U iron 21 is connected with the cavity 11.
  • the notch of the accommodating groove 211 is opposite to the diaphragm 31.
  • the U iron 21 is adjacent to the notch of the accommodating groove 211.
  • the end surface forms a supporting surface 212
  • the outer magnetic circuit part 23 is provided on the supporting surface 212, and is connected to the basin frame 1
  • the inner magnetic circuit part 22 is provided in the accommodating groove 211, so that the side walls of the accommodating groove 211 and the external magnetic circuit part 23 is spaced apart from the inner magnetic circuit part 22 to form a magnetic gap 24.
  • the voice coil 32 of the vibration system 3 is located in the vibration space of the sound-generating device 100, so that one end of the voice coil 32 is connected to the diaphragm 31, and the other end of the voice coil 32 is suspended In the magnetic gap 24, when the voice coil 32 is energized, the voice coil 32 introduces electric energy into the magnetic gap 24 of the magnetic circuit system 2.
  • the voice coil 32 Under the action of the magnetic field of the magnetic circuit system 2, the voice coil 32 is driven to cut the magnetic field lines. In this way, electrical energy is converted into mechanical energy.
  • the voice coil 32 moves, it drives the diaphragm 32 to vibrate, so that the diaphragm 32 vibrates and produces sound. In this way, the mechanical energy is converted into sound energy, thereby realizing electroacoustic conversion.
  • the magnetic circuit system 2 and the basin frame 1 are fixed by bonding or welding, thereby improving the heat dissipation effect of the sound-generating device 100.
  • the magnetic conductive plate of the external magnetic circuit part 23 of the magnetic circuit system 2 can also be injection molded into the basin frame 1 as an insert, or the magnetic circuit system 2 and the basin frame can be 1. Use bonding to fix, and then other parts to bond and fix. There is no limit here.
  • the inner magnetic circuit part 22 is disposed in the accommodating groove 211, which can reduce the longitudinal space of the sound-generating device 100, lower the height of the product, and can be used in a narrower space, achieving a compact product.
  • this structure prevents the diaphragm 31 from interfering with the magnetic circuit system 2 when operating at a large amplitude.
  • an external magnetic circuit part 23 is provided on the supporting surface 212 formed on the end surface of the U-iron 21 adjacent to the notch of the accommodating groove 211, thereby further increasing the magnetic field intensity.
  • the outer magnetic circuit part 23 is installed and fixed on the end surface of the U iron 21, and the inner magnetic circuit part 22 is provided in the receiving groove 211 of the U iron 21, using the inner magnetic circuit part 23.
  • the magnetic circuit part 22 , the external magnetic circuit part 23 and the U iron 21 increase the magnetic field intensity and magnetic flux density to increase the driving force of the voice coil 32 .
  • the notch groove 2221 is provided on the inner magnetic circuit part 22, thereby eliminating the part with low magnetic permeability on the inner magnetic circuit part 22, thereby Reduce the weight of the inner magnetic circuit part 22, so that the high magnetic permeability part of the inner magnetic circuit part 22 can be fully utilized to ensure a good BL value and linear range of the sound-generating device 100 while also meeting the requirements of miniaturization and lightweight design. Require.
  • the sound-generating device 100 of the present invention uses the basin frame 1 to install, fix and protect the magnetic circuit system 2 and the vibration system 3 by arranging a cavity 11 open at both ends in the basin frame 1, and by configuring the magnetic circuit system 2 as a U iron 21.
  • the inner magnetic circuit part 22 and the outer magnetic circuit part 23 are installed and fixed using the receiving groove 211 of the U iron 21, and the outer magnetic circuit part 23 is set on the supporting surface 212 of the U iron 21, so that the inner magnetic circuit part 23 is installed and fixed.
  • the magnetic circuit part 22 is enclosed with the side wall of the accommodating groove 211 of the U iron 21 and the outer magnetic circuit part 23 to form a magnetic gap 24 for the voice coil 32 of the vibration system 3 to be suspended.
  • the voice coil 32 After the voice coil 32 is energized, the voice coil 32 The movement of cutting the magnetic field lines in the magnetic gap 24 of the magnetic circuit system 2 drives the diaphragm 31 to vibrate and produce sound; a notch 2221 is provided on the side of the inner magnetic circuit part 22 facing the magnetic gap 24, thereby canceling the inner magnetic field.
  • the low magnetic permeability part of the inner magnetic circuit part 22 is used to reduce the weight of the inner magnetic circuit part 22, and the part with high magnetic permeability of the inner magnetic circuit part 22 is fully utilized to ensure a good BL value and linear range of the sound-generating device 100 while also ensuring a good BL value and linear range. It can meet the design requirements of miniaturization and lightweight.
  • the inner magnetic circuit part 22 includes a stacked inner magnet 221 and an inner washer 222.
  • the inner magnet 221 is sandwiched between the inner washer 222 and the bottom wall of the accommodating groove 211.
  • the inner washer 222 faces One side of the magnetic gap 24 is provided with a notch groove 2221;
  • the outer magnetic circuit part 23 includes a stacked outer magnet 231 and an outer washer 232.
  • the outer magnet 231 is sandwiched between the outer washer 232 and the supporting surface 212.
  • the outer washer 232 is arranged in a stack. 232 is connected to the basin frame 1.
  • the inner magnetic circuit part 22 includes an inner magnet 221 and an inner magnet 222 .
  • the inner magnet 221 can be a magnet, and the inner magnet 222 can be a magnetic conductive plate structure.
  • the shape outline of the inner magnet 221 is the same as or consistent with the shape outline of the inner magnet 222 .
  • inner magnet 221 and Nehua Division 222 can be round, oval, square or track-shaped, etc., and is not limited here.
  • the outer magnetic circuit part 23 includes an outer magnet 231 and an outer washer 232.
  • the outer magnet 231 can be a magnet
  • the outer washer 232 can be a magnetic conductive plate structure.
  • the shape outline of the outer magnet 231 is the same as or consistent with the shape outline of the outer washer 232 .
  • the outer magnet 231 and the outer washer 232 can be in the shape of a circular ring, an elliptical ring, a square ring or a track ring, etc., which are not limited here.
  • the shape and contour of the inner magnet 221 and the inner washers 222 of the inner magnetic circuit part 22 are roughly similar to the shape and contour of the receiving groove 211 of the U iron 21, and the shapes and contours of the outer magnet 231 and the outer washers 232 of the outer magnetic circuit part 23 are similar.
  • the shape and outline are roughly similar to the shape and outline of the notch of the accommodating groove 211 of the U iron 21 .
  • the U iron 21 is a cylindrical structure with one end open.
  • the supporting surface 212 of the U iron 21 is bonded and fixed with the outer magnet 231 of the outer magnetic circuit part 23.
  • the outer magnet 231 and the outer washer 232 are bonded and fixed.
  • the outer magnetic circuit part 23 passes through the outer washer. 232 is connected and fixed with the basin frame 1.
  • the outer washer 232 and the basin frame 1 can be connected by welding, bonding or integral molding, which is not limited here.
  • a limiting protrusion 2321 is provided on the side of the outer washer 232 facing away from the magnetic gap 24.
  • the basin frame 1 is provided with a limiting groove 12, and the limiting protrusion 2321 accommodates And is limited in the limiting groove 12. It can be understood that such an arrangement can improve the connection stability between the basin frame 1 and the external magnetic circuit part 23 and realize the limited installation of the magnetic circuit system 2 .
  • a recessed groove 2222 is provided on the side of the inner wall 222 facing away from the inner magnet 221 .
  • a notch groove 2221 is provided on the side of the inner magnet 222 facing the magnetic gap 24, and a recessed groove 2222 is provided on the side of the inner magnet 222 facing away from the inner magnet 221, so that the inner magnet 222 is 222 forms a stepped structure, so that the notched groove 2221 and the recessed groove 2222 are further used to further eliminate the low magnetic permeability part of the inner wall 222, so as to reduce the weight of the inner wall 222, achieve the purpose of weight reduction, and at the same time ensure that the inner wall 222 is in Magnetic permeability and magnetic field strength under the action of inner magnet 221.
  • the notch groove 2221 may be a notch, a groove, or other structures.
  • the recessed groove 2222 may be a groove structure or a through-groove structure, which is not limited here.
  • the recessed groove 2222 is formed by recessing the side of the inner valve 222 away from the inner magnet 221 toward the inner magnet 221 .
  • the depressed groove 2222 is located in the middle of the inner valve 222 .
  • the inner wall of the recessed groove 2222 is arranged in an arc surface, so that the air flow generated by the vibration of the diaphragm 31 flows more smoothly.
  • the notch groove 2221 and the recessed groove 2222 of the inner valve 222 of the present invention cooperate to remove the inner valve.
  • the low magnetic permeability part of 222 can increase the magnetic flux density of Nehuas 222. This can effectively reduce the weight of Nehuas 222 and improve the use efficiency of Nehuas 222 while ensuring the magnetic flux.
  • the BL curve is more symmetrical, the force received by the voice coil 32 during the reciprocating vibration is more balanced, and the vibration state is more stable.
  • the voice coil 32 of the vibration system 3 can maintain the maximum displacement of a constant number of voice coils located in the magnetic gap 23 when cutting the magnetic field lines in the magnetic gap 24, the voice coil 32 adopts a long voice coil.
  • the Nehua Division 222 is in a stepped shape adjacent to the magnetic gap 24, which can increase the magnetic flux density at the magnetic gap 24 and ensure that the sound-generating device 100 has higher sensitivity while ensuring BL value, the linear range of the sound-generating device 100 is increased.
  • the notch groove 2221 extends along the periphery of the inner wall 222 , such that the notch groove 2221 extends along the circumferential direction of the magnetic gap 24 to form an annular groove structure located on the outer wall of the inner wall 222 .
  • the notch groove 2221 is provided adjacent to the inner magnet 221 .
  • the notch groove 2221 penetrates the bottom surface of the inner valve 222 facing the inner magnet 221 , so that the outer wall of the inner valve 222 facing the magnetic gap 24 is arranged in a stepped manner.
  • the recessed groove 2222 may be a semicircular groove or a hemispherical groove.
  • the connection between the groove wall of the recessed groove 2222 and the side surface of the Nehua 222 facing away from the inner magnet 221 is provided with a rounded corner or an arc-shaped transition, so that the airflow generated by the vibration of the diaphragm 31 can flow more smoothly.
  • the inner wall of the recessed groove 2222 includes a connected convex arc surface and a concave arc surface, and the side of the convex arc surface away from the concave arc surface is connected to the outer wall of the inner washboard 222 .
  • the inner wall of the recessed groove 2222 is configured as a connected convex arc surface and a concave arc surface, so that the convex arc surface is located at the edge of the concave arc surface and is connected with the inner wall.
  • the outer walls of the washers 222 are connected to ensure that the upper end of the washers 222 is arranged in a smooth transition to uniformize the magnetic flux lines and further increase the magnetic flux density at the magnetic gap 24 .
  • connection between the convex arc surface and the concave arc surface is provided with a smooth transition, that is, the inner wall of the recessed groove 2222 has a smooth arc structure, thereby making the air flow generated by the vibration of the diaphragm 31 smoother and reducing air flow impact. Interference caused by magnetic circuit system 2.
  • the thickness of the inner magnet 221 is defined as h1, and the thickness of the outer magnet 231 is defined as h2, where 0.8 ⁇ h1/h2 ⁇ 1.2. It can be understood that, as shown in Figures 3 and 4, the thickness h1 of the inner magnet 221 is the thickness of the inner magnet 221 along the movement direction of the voice coil 32 or the vibration direction of the diaphragm 31, and the thickness h2 of the outer magnet 231 is the thickness of the outer magnet 231 along the sound direction. The thickness in the moving direction of the ring 32 or the vibration direction of the diaphragm 31.
  • the ratio of the thickness h1 of the inner magnet 221 to the thickness h2 of the outer magnet 231 is 0.8, 0.9, 1, 1.1, 1.2, etc., which is not limited here.
  • the maximum thickness of the inner washers 222 is defined as t1, and the thickness of the outer washers 232 is defined as t2, where 2 ⁇ t1/t2 ⁇ 2.5. It can be understood that, as shown in FIGS. 3 and 4 , the maximum thickness t1 of the inner tube 222 is the maximum thickness t1 between the side of the inner tube 222 facing away from the inner magnet 221 and the side of the inner tube 222 facing the inner magnet 221 .
  • the thickness of the inner washers 222 is the thickness of the inner washers 222 along the movement direction of the voice coil 32 or the vibration direction of the diaphragm 31
  • the thickness t2 of the outer washers 232 is the thickness of the outer washers 232 along the movement direction of the voice coil 32 or the vibration direction of the diaphragm 31. thickness in the vibration direction.
  • the magnetic field distribution of the magnetic circuit system 2 is more uniform, and in a limited space and Maximize the magnetic field strength within the cost range.
  • the ratio of the maximum thickness t1 of the inner member 222 to the thickness t2 of the outer member 232 is 2, 2.1, 2.2, 2.3, 2.4, 2.5, etc., which is not limited here.
  • the radius of the inner washboard 222 is defined as d1
  • the width of the outer washstand 232 is defined as d2, where 1.5 ⁇ d1/d2 ⁇ 2.
  • the inner valve 222 can be a disk structure
  • the radius d1 of the inner valve 222 is the radius of a side surface of the inner valve 222 facing away from the inner magnet 221
  • the outer valve 232 can be a circular ring structure.
  • the magnetic field distribution of the magnetic circuit system 2 is more uniform, and the magnetic field distribution in the limited space is more uniform. Maximize the magnetic field strength within the range of cost and cost.
  • the ratio of the radius d1 of the inner wall 222 to the width d2 of the outer wall 232 is 1.5, 1.6, 1.7, 1.8, 1.9, 2, etc., which is not limited here.
  • the cross-section of the recessed groove 2222 is semicircular, the radius of the recessed groove 2222 is defined as R, the maximum thickness of the inner wall 222 is defined as t1, and the inner wall 222 is defined as The radius of is d1, where t1 ⁇ R ⁇ d1.
  • the inner tube 222 is cut from the middle of the inner tube 222 along the moving direction of the voice coil 32 or the vibration direction of the diaphragm 31 .
  • the cross section of the recessed groove 2222 is semicircular.
  • the inner magnetic circuit part 22 also includes a short-circuit ring 223.
  • the short-circuit ring 223 includes a first section 2231 and a second section 2232 arranged at an angle.
  • the first section 2231 and the inner magnet 222 face away from the inner magnet 221.
  • the second section 2232 is attached to the side of the inner magnet 222 facing the magnetic gap 24 and extends to the inner magnet 221 to cover the notch groove 2221 .
  • a short-circuit ring 223 is provided to effectively reduce the reverse electromotive force of the voice coil 32 in the magnetic gap 24 , thereby reducing inductance and improving high-frequency sensitivity.
  • the short-circuit ring 223 is made of copper.
  • the short-circuit ring 223 has an annular cylindrical structure. As shown in FIGS. 1 to 4 , the short-circuit ring 223 includes a first section 2231 and a second section 2232 arranged at an angle. Optionally, the first section 2231 and the second section 2232 are arranged vertically.
  • the first section 2231 is connected to the side of the inner wall 222 facing away from the inner magnet 221, and the first section 2231 is provided with an opening corresponding to the recessed groove 2222, that is, the recessed groove 2222 is exposed in the opening.
  • the second section 2232 is attached to the side of the internal magnet 222 facing the magnetic gap 24 and extends to the inner magnet 221 to cover the notch 2221 .
  • the length of the notch groove 2221 along the axis of the magnetic gap 24 is defined as a, and the length of the notch groove 2221 along the direction perpendicular to the axis of the magnetic gap 24 is defined as b; where, 1.8 ⁇ a/ b ⁇ 2.2.
  • the axial direction of the magnetic gap 24 is the moving direction of the voice coil 32
  • the axial direction perpendicular to the magnetic gap 24 is the direction from the inner magnetic circuit part 22 to the side wall of the U-iron 21 accommodating groove 211 .
  • the length of the notch groove 2221 along the axis of the magnetic gap 24 is defined as a, and the length of the notch groove 2221 along the direction perpendicular to the axis of the magnetic gap 24 is defined as b, so that the ratio of the length a of the notch groove 2221 along the axis direction of the magnetic gap 24 to the length b of the notch groove 2221 along the direction perpendicular to the axis of the magnetic gap 24 is in the range of 1.8 to 2.2, so that by setting it on the inner magnetic circuit part 22
  • the notch groove 2221 is used to cancel the low magnetic permeability part of the inner magnetic circuit part 22, thereby reducing the weight of the inner magnetic circuit part 22, so that the high magnetic permeability part of the inner magnetic circuit part 22 can be fully utilized to ensure that the sound-generating device 100 is in good condition While having a high BL value and linear range, it can also meet the design requirements of miniaturization and
  • the ratio of the length a of the notch groove 2221 along the axis direction of the magnetic gap 24 to the length b of the notch groove 2221 along the direction perpendicular to the axis of the magnetic gap 24 is 1.8, 1.9, 2, 2.1, 2.2, etc., and is not used here. Make limitations.
  • a boss 213 protrudes from the bottom wall of the accommodating groove 211.
  • the boss 213 is spaced apart from the side walls of the accommodating groove 211 and encloses a relief groove 214 that communicates with the accommodating groove 211.
  • the groove 214 corresponds to the magnetic gap 24 , and the inner magnetic circuit part 22 is supported on the boss 213 .
  • a boss 213 is provided on the bottom wall of the accommodating groove 211 of the U iron 21 so that the boss 213 is spaced apart from the side walls of the accommodating groove 211 to form an enclosure.
  • the relief groove 214 is connected with the magnetic gap 24 correspondingly, so that while the boss 213 is used to support and fix the inner magnetic circuit part 22, the relief groove 214 is used to avoid the movement of the voice coil 32 in the magnetic gap 24. , to ensure the amplitude of the sound-generating device 100.
  • the boss 213 may be a protruding structure protruding from the bottom wall of the accommodating groove 211 .
  • the boss 213 can also be formed by a side of the U iron 21 facing away from the bottom wall of the accommodating groove 211 and protruding toward the inside of the accommodating groove 211, which is not limited here.
  • a groove 215 is recessed on the side of the U iron 21 facing away from the notch of the accommodating groove 211. That is, the groove 215 is formed on the side of the U iron 21 facing away from the bottom wall of the accommodating groove 211 corresponding to the boss 213. .
  • a through hole is provided on the frame 1 and communicates with the vibration space.
  • a through-hole structure corresponding to the through-hole may also be provided on the inner magnetic circuit part 22 .
  • the through hole is opened in the bottom wall of the cavity 11 of the basin frame 1 and penetrates the bottom wall of the cavity 11 .
  • the vibration system 3 also includes a centering ring 33.
  • the inner side of the centering ring 33 is connected to the outer wall of the voice coil 32.
  • the basin frame 1 is protrudingly provided with a fixing platform 13.
  • the centering ring 33 The outer side is connected with the fixed platform 13. It can be understood that by providing the centering ring 33, the centering ring 33 can be used to effectively prevent the voice coil 32 from being polarized or swinging left and right during the vibration process, thereby improving the vibrating sound effect of the diaphragm 31.
  • the fixing platform 13 can be a boss structure formed by protruding from the inner wall of the cavity 11 , or it can be a step structure formed by the inner wall of the cavity 11 , which is not limited here.
  • the U iron 21 extends adjacent to the support surface 212 toward the side away from the accommodating groove 211 to form a support platform 216 .
  • the support platform 216 is flush with the support surface 212 , and the external magnetic circuit
  • the portion 23 is supported on the support surface 212 and the support platform 216 . It can be understood that by providing the support platform 216, the support platform 216 and the support surface 212 are used to increase the contact area with the external magnetic circuit part 23, so as to improve the connection stability between the external magnetic circuit part 23 and the U-iron 21.
  • the present invention also proposes a terminal equipment, which includes an equipment housing and the above-mentioned sound-generating device 100.
  • the sound-generating device 100 is provided in the equipment housing.
  • the specific structure of the sound-generating device 100 refers to the aforementioned embodiments. Since this terminal device adopts all the technical solutions of all the aforementioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the aforementioned embodiments, and will not be detailed here. Repeat.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)

Abstract

L'invention concerne un appareil de production de son (100) et un dispositif terminal. L'appareil de production de son (100) comprend un panier (1), un système de circuit magnétique (2) et un système de vibration (3). Le système de circuit magnétique (2) comprend un fer en forme de U (21), une partie de circuit magnétique interne (22) et une partie de circuit magnétique externe (23). La partie de circuit magnétique interne (22) est disposée dans un évidement de réception (211) du fer en forme de U (21), et la partie de circuit magnétique externe (23) est disposée sur une surface de support (212) du fer en forme de U (21) et est reliée au panier (1). La partie de circuit magnétique externe (23) est mise en correspondance avec le fer en forme de U (21) pour recouvrir une ouverture à une extrémité d'une cavité de réception (11). La paroi latérale et la partie de circuit magnétique externe (23) de l'évidement de réception (211) sont espacées de la partie de circuit magnétique interne (22) pour former un entrefer magnétique (24). Le côté de la partie de circuit magnétique interne (22) faisant face à l'entrefer magnétique (24) est pourvu d'une rainure d'encoche (2221). Le système vibrant (3) comprend un diaphragme (31) et une bobine acoustique (32) reliée au diaphragme vibrant (31). Le diaphragme vibrant (31) est relié au panier (1) et recouvre une ouverture à l'autre extrémité de la cavité de réception (11). L'extrémité de la bobine acoustique (32) éloignée du diaphragme vibrant (31) est suspendue dans l'entrefer magnétique (24). L'appareil de production de son (100) avoir un poids efficacement réduit et assurer une bonne valeur BL et une bonne plage linéaire, et peut également satisfaire des exigences de conception de miniaturisation et de poids léger.
PCT/CN2023/109841 2022-07-28 2023-07-28 Appareil de production de son et dispositif terminal WO2024022489A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202210903861.5A CN115103279A (zh) 2022-07-28 2022-07-28 发声装置和终端设备
CN202210903861.5 2022-07-28

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WO2024022489A1 true WO2024022489A1 (fr) 2024-02-01

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115103279A (zh) * 2022-07-28 2022-09-23 潍坊歌尔丹拿电子科技有限公司 发声装置和终端设备

Citations (7)

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US20130163806A1 (en) * 2011-12-23 2013-06-27 Aurasound, Inc. Driver assembly for loudspeakers
CN103188591A (zh) * 2011-12-29 2013-07-03 鸿富锦精密工业（深圳）有限公司 喇叭
CN103945311A (zh) * 2014-04-24 2014-07-23 中山市天键电声有限公司 一种新型双音圈动圈式扬声器
CN105828246A (zh) * 2016-05-19 2016-08-03 青岛歌尔声学科技有限公司 一种低音扬声器
CN107968979A (zh) * 2017-12-27 2018-04-27 Tcl通力电子（惠州）有限公司 发声器件
CN109462806A (zh) * 2018-12-29 2019-03-12 歌尔股份有限公司 扬声器
CN115103279A (zh) * 2022-07-28 2022-09-23 潍坊歌尔丹拿电子科技有限公司 发声装置和终端设备

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130163806A1 (en) * 2011-12-23 2013-06-27 Aurasound, Inc. Driver assembly for loudspeakers
CN103188591A (zh) * 2011-12-29 2013-07-03 鸿富锦精密工业（深圳）有限公司 喇叭
CN103945311A (zh) * 2014-04-24 2014-07-23 中山市天键电声有限公司 一种新型双音圈动圈式扬声器
CN105828246A (zh) * 2016-05-19 2016-08-03 青岛歌尔声学科技有限公司 一种低音扬声器
CN107968979A (zh) * 2017-12-27 2018-04-27 Tcl通力电子（惠州）有限公司 发声器件
CN109462806A (zh) * 2018-12-29 2019-03-12 歌尔股份有限公司 扬声器
CN115103279A (zh) * 2022-07-28 2022-09-23 潍坊歌尔丹拿电子科技有限公司 发声装置和终端设备

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