WO2020244208A1 - Dispositif de génération de son - Google Patents

Dispositif de génération de son Download PDF

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Publication number
WO2020244208A1
WO2020244208A1 PCT/CN2019/128435 CN2019128435W WO2020244208A1 WO 2020244208 A1 WO2020244208 A1 WO 2020244208A1 CN 2019128435 W CN2019128435 W CN 2019128435W WO 2020244208 A1 WO2020244208 A1 WO 2020244208A1
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WO
WIPO (PCT)
Prior art keywords
magnetic
magnets
magnet
sides
central
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PCT/CN2019/128435
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English (en)
Chinese (zh)
Inventor
祖峰磊
徐同雁
曹明君
刘春发
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歌尔股份有限公司
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Publication of WO2020244208A1 publication Critical patent/WO2020244208A1/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
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/06—Loudspeakers

Definitions

  • the present invention relates to the technical field of sound energy conversion, in particular to a sound generating device.
  • Micro-sounding device is an important electro-acoustic conversion component in mobile communication equipment. It is used to convert electrical signals into sound. It is used to form components such as speakers, earpieces, and earphones of mobile communication equipment. With the development of the mobile communication equipment industry, the micro-sounding device industry has developed rapidly, and the performance requirements for the micro-sounding device are getting higher and higher.
  • the moving-coil sounding device is a specific sounding device structure widely used in mobile communication equipment.
  • the existing moving-coil sounding device is shown in Figure 1, and usually includes a housing and a vibration system and a magnetic circuit accommodating and fixed on the housing.
  • the vibration system includes a diaphragm and a voice coil 04.
  • the magnetic circuit system forms a magnetic gap to accommodate the voice coil. After a current is applied to the voice coil, the voice coil vibrates under the action of the magnetic field of the magnetic circuit system to drive the vibration The membrane vibrates and produces sound.
  • the magnetic circuit system usually includes a magnetic yoke 01 and a central magnetic circuit part and a side magnetic circuit part arranged on the magnetic yoke 01.
  • the central magnetic circuit part includes a central magnet 021 and a central magnetic plate 022
  • the side magnetic circuit part includes side magnet 031 and side magnetic guide plate 032.
  • the central magnet 021 and side magnet 031 are magnetized in the vertical direction, and their magnetizing directions are opposite.
  • the magnetic yoke 01 and the magnetic guide plate are used to align The magnetic lines of induction generated by the two magnets gather and guide their direction, enhancing the strength of the magnetic field located in the magnetic gap.
  • the magnetic circuit structure in the prior art is relatively flat, and the outer side of the side magnet is prone to magnetic short-circuit phenomenon.
  • the driving force factor BL value (a certain number of turns The wire length L multiplied by the magnetic flux density per unit area B) is not high, the magnetic field cannot be fully utilized, and the sensitivity of the sound device is not high, which affects the acoustic performance of the sound device.
  • BL(x) when adjusting the symmetry of the BL(x) curve, it is necessary to reopen the mold and design the height of the magnet and the magnetic conductive plate to increase the design cost.
  • the technical problem to be solved by the present invention is to overcome the problems in the prior art and provide a sound generating device with better acoustic performance.
  • the technical solution of the present invention is: a sound generating device, including a vibration system and a magnetic circuit system, the vibration system includes a diaphragm and a voice coil combined with the diaphragm, the magnetic circuit system includes A magnetic yoke and a central magnetic circuit part and a side magnetic circuit part provided on the bottom wall of the magnetic yoke, a magnetic gap is formed between the central magnetic circuit part and the side magnetic circuit part, and the voice coil extends Into the magnetic gap, where
  • the central magnetic circuit part includes a central magnet and a central magnetic component arranged side by side from bottom to top;
  • the side magnetic circuit part includes side magnets and side magnetic parts arranged side by side from bottom to top;
  • the polarities of the magnetic poles at the end close to the bottom wall of the magnetic yoke of the center magnet and the side magnets are different, and the polarities of the magnetic poles at the end far from the magnetic yoke are also different;
  • At least one of the central magnetic component and the side magnetic component is a permanent magnet, and the magnetic pole of one end of the permanent magnet close to the magnetic gap is parallel to the central magnet or the side magnet far from the guide.
  • the poles at one end of the bottom wall of the yoke have the same polarity.
  • the central magnet is rectangular, and the central magnet includes two opposite first sides and two opposite second sides;
  • the side magnetic circuit portion includes two side magnets and two side magnetic parts located outside the two first sides of the center magnet; or, the side magnetic circuit portion includes two first sides located on the center magnet And four side magnets and four side magnet parts outside the two second sides.
  • the magnetization directions of the center magnet and the side magnets are parallel to the vibration direction of the diaphragm, and the magnetization direction of the permanent magnet is perpendicular to the vibration direction of the diaphragm.
  • the central magnetic component is a permanent magnet
  • the side magnetic component is a permeable magnet
  • the central magnetic component includes at least two first magnets corresponding to the two first sides of the central magnet, and the two first magnets are spaced apart from each other.
  • the central magnetic component includes four first magnets corresponding to two first sides and two second sides of the central magnet, and the four first magnets are arranged at intervals;
  • the side magnetic circuit part includes two side magnets and two second magnets located outside the two first sides of the center magnet, and the two second magnets are independent of each other, or the two The second magnetic conductor is connected into an integral structure by a connecting part; or, the side magnetic circuit part includes four side magnets and four second guides located outside the two first sides and two second sides of the central magnet For the magnet, the four second magnetic conductors are of mutually independent structures, or the four second magnetic conductors are connected to form an integral structure through a connecting portion.
  • each of the first magnets includes a rectangular portion located close to the magnetic gap and a trapezoidal portion located away from the magnetic gap.
  • the trapezoidal portion includes two hypotenuses, two adjacent to each other. The oblique sides of the trapezoidal part of the first magnet are opposite and spaced apart.
  • the central magnetic component is a first magnetic conductor, and the edge magnetic component is a permanent magnet;
  • the side magnetic circuit portion includes two side magnets and two second magnets located outside the two first sides of the center magnet; or, the side magnetic circuit portion includes two first sides located on the center magnet And four side magnets and four second magnets outside the two second sides.
  • the central magnetic component is a permanent magnet
  • the edge magnetic component is a permanent magnet
  • the central magnetic component includes two first magnets corresponding to the two first sides of the central magnet, and the two first magnets are spaced apart from each other, or include two first sides and Four first magnets corresponding to the two second sides, and the four first magnets are spaced apart from each other;
  • the side magnetic circuit portion includes two side magnets and two second magnets located outside the two first sides of the center magnet; or, the side magnetic circuit portion includes two first sides located on the center magnet And four side magnets and four second magnets outside the two second sides.
  • the central magnetic component is a permanent magnet
  • the edge magnetic component is a permanent magnet
  • the magnetization directions of the center magnet and the side magnets are in a direction inclined with respect to the vibration direction of the diaphragm, and the magnetization direction of the center magnet and the magnetization direction of the side magnets form a first angle ,
  • the opening direction of the first included angle is away from the bottom wall of the magnetic yoke;
  • the magnetization directions of the central magnetic component and the side magnetic components are in a direction inclined with respect to the plane of the bottom wall of the magnetic yoke, and the magnetization direction of the central magnetic component is the same as that of the side magnetic components.
  • the magnetic direction forms a second included angle, and the opening direction of the second included angle faces the bottom wall of the magnetic yoke.
  • the angle at which the magnetization directions of the center magnet and the side magnets are inclined relative to the vibration direction of the diaphragm is greater than or equal to 0° and less than or equal to 45°;
  • the magnetization directions of the central magnetic component and the side magnetic components are inclined at an angle of greater than 0° and less than or equal to 45° with respect to the plane of the bottom wall of the magnetic yoke.
  • the central magnetic component includes two first magnets corresponding to the two first sides of the central magnet, and the two first magnets are spaced apart from each other, or include Four first magnets corresponding to two first sides and two second sides of the magnet, and the four first magnets are spaced apart from each other;
  • the side magnetic circuit portion includes two side magnets and two second magnets located outside the two first sides of the center magnet; or, the side magnetic circuit portion includes two first sides located on the center magnet And four side magnets and four second magnets outside the two second sides.
  • the two first sides of the center magnet are long sides, and the two second sides are short sides.
  • the sound generating device of the present invention can reduce the magnetic short circuit of the side magnetic circuit, increase the magnetic field strength in the magnetic gap, increase the BL value, and increase the magnetic field driving force to improve Acoustic sensitivity.
  • the magnetization directions of the center magnet and the side magnets may be parallel to the vibration direction of the diaphragm, and the magnetization directions of the permanent magnets are perpendicular to the vibration direction of the diaphragm.
  • the magnetization directions of the permanent magnets and even the center magnet and the side magnets are arranged obliquely based on the above directions, and the magnetization direction is deviated to improve the symmetry of BL(x) to reduce distortion .
  • Figure 1 shows the structure of a sounding device in the prior art.
  • Figure 2 is a distribution diagram of magnetic lines of induction of the magnetic circuit system of the sound generating device in the prior art
  • Figure 3 is a schematic cross-sectional view of the sound generating device in the first embodiment of the present invention.
  • FIG. 4 is a schematic diagram of an exploded structure of the sound generating device in FIG. 3;
  • Fig. 5 is a distribution diagram of magnetic lines of induction of the magnetic circuit system of the sounding device in Fig. 3;
  • FIG. 6 is a schematic diagram showing the comparison of BL(X) curves between the sound generating device of the present invention and the sound generating device in the prior art;
  • FIG. 7 is a schematic cross-sectional view of the sound generating device in the second embodiment of the present invention.
  • FIG. 8 is a schematic diagram of an exploded structure of the sound generating device in FIG. 7;
  • Figure 9 is a top view of the sounding device in Figure 7;
  • FIG. 10 is a distribution diagram of magnetic lines of induction of the magnetic circuit system of the sound device in FIG. 7;
  • FIG. 11 is a schematic cross-sectional view of three sound generating devices according to an embodiment of the present invention.
  • Figure 12 is a distribution diagram of magnetic lines of induction of the magnetic circuit system of the sounding device in Figure 11;
  • FIG. 13 is a schematic diagram of an exploded structure of the sound generating device in FIG. 11;
  • FIG. 14 is a schematic cross-sectional view of the sound generating device in the fourth embodiment of the present invention.
  • FIG. 15 is a distribution diagram of magnetic lines of induction of the magnetic circuit system of the sound generating device in FIG. 14.
  • Fig. 16 is a BL(X) curve diagram of the sound generating device in Fig. 14.
  • the directional indication is only used to explain that it is in a specific posture (as shown in the drawings). If the specific posture changes, the relative positional relationship, movement, etc. of the components below will also change the directional indication accordingly.
  • the present invention provides a sound emitting device, which can be used in electronic devices capable of sounding such as earphones and mobile phones.
  • the sound device specifically includes a vibration system and a magnetic circuit system.
  • the vibration system includes a diaphragm and a voice coil 4 combined with the diaphragm.
  • the magnetic circuit system includes a magnetic yoke. 1 and the central magnetic circuit portion and the side magnetic circuit portion provided on the bottom wall of the magnetic yoke 1, a magnetic gap is formed between the central magnetic circuit portion and the side magnetic circuit portion, and the voice coil 4 extends In the magnetic gap, after the current is passed through the voice coil 4, the voice coil 4 is forced to vibrate under the action of the magnetic field of the magnetic circuit system, thereby driving the diaphragm to vibrate and produce sound.
  • the central magnetic circuit part includes a central magnet 21 and a central magnetic part arranged side by side from bottom to top;
  • the side magnetic circuit part includes side magnets 31 and side magnetic parts arranged side by side from bottom to top.
  • the magnetic poles of the center magnet 21 and the side magnets 31 near the bottom wall of the magnetic yoke 1 have different polarities, and the magnetic poles of the end far away from the magnetic yoke 1 have different polarities;
  • At least one of the central magnetic component and the side magnetic component is a permanent magnet, and the magnetic pole of one end of the permanent magnet close to the magnetic gap is parallel to the central magnet 21 or the side magnet 31 far from the guide.
  • the polarities of the magnetic poles at one end of the bottom wall of the yoke 1 are the same.
  • the permeable magnet is used, which cannot form a magnetic field by itself, and can only be used to gather the magnetic lines of induction and constrain the direction of the magnetic lines of induction, and strengthen the penetration sound
  • the sound generating device of this embodiment by adding permanent magnets to the center magnet 21 and/or the side magnets 31, it can not only reduce the magnetic short-circuit phenomenon of the side magnetic circuit part, increase the magnetic field strength in the magnetic gap, increase the BL value, and increase the magnetic field. Driving force to improve acoustic sensitivity.
  • the central magnet 21 is rectangular, and the central magnet 21 includes two opposite first sides and two opposite second sides. Specifically, the two first sides are preferably the long sides of the central magnet 21. The second side is the short side of the center magnet 21.
  • the side magnetic circuit portion includes two side magnets 31 and two side magnetic parts located outside the two first sides of the center magnet 21; or, the side magnetic circuit portion includes two side magnets 31 located on the center magnet 21 Four side magnets 31 and four side magnet parts outside the first side and the two second sides.
  • a side magnet 31 is arranged on the long side of the center magnet 21 to increase the volume of the permanent magnet and maximize the magnetic field strength of the magnetic circuit system.
  • the side magnetic circuit component when the preset size of the sound generating device is large enough, the side magnetic circuit component includes four side magnets located outside the two first sides and the two second sides of the central magnet 21 31 and the four side magnetic parts, corresponding to each side of the center magnet 21, one side magnetic part and one side magnet 31 are arranged up and down.
  • the arrow direction is the magnetizing direction
  • the magnetizing direction of the center magnet 21 and the side magnets 31 is parallel to the vibration direction of the diaphragm
  • the central magnetic component is a first magnetic conductor 22 arranged on the central magnet 21, and the edge magnetic component is a permanent magnet.
  • the side magnetic circuit portion includes four side magnets 31 and four second magnets 33 located outside the two first sides and two second sides of the center magnet 21, corresponding to each of the center magnet 21 Each side part is provided with a second magnet 33 and a side magnet 31 arranged up and down.
  • Four second magnets 33 are arranged at intervals.
  • the magnetizing process is simple.
  • gaps are formed between the four second magnets 33 to form a channel structure connecting the inside and outside of the sound generating device, which is beneficial to the smooth vibration of the diaphragm.
  • the notch at the corner can provide accommodation space for the bending section of the voice coil lead, and there is no need to separately reserve a horizontal or longitudinal space for the voice coil lead.
  • the preset size of the sound generating device when the preset size of the sound generating device is relatively small, only two side magnets 31 are provided outside the two first sides of the center magnet 21, and two side magnets 31 are provided correspondingly.
  • the second magnet 33 on the outer sides of the two second sides of the central magnet 21, the sides of the yoke 1 are correspondingly provided with bent side walls, and a magnetic gap is formed between the bent side walls and the central magnetic circuit part.
  • the magnetic pole of the second magnet 33 at one end close to the magnetic gap and the side magnet 31 arranged in parallel with the magnetic pole at the end far from the bottom wall of the magnetic yoke 1
  • the polarity of the end of the second magnet 33 far away from the magnetic gap is the same as that of the end of the side magnets 31 arranged in parallel close to the bottom wall of the yoke 1.
  • Fig. 5 is a distribution diagram of magnetic line of induction of the magnetic circuit system in this embodiment
  • Fig. 2 is a distribution diagram of magnetic line of induction of the magnetic circuit system in the prior art.
  • Figures 5 and 2 compared with the side magnetic guide plate in the prior art, in this embodiment, the magnetic flux density in the second magnet 33 increases, and the magnetic flux density of the magnetic gap increases.
  • the central magnetic component in this embodiment is a permanent magnet
  • the edge magnetic component is Conductive magnet
  • the arrow direction is the magnetizing direction
  • the magnetizing direction of the center magnet 21 and the side magnets 31 is parallel to the vibration direction of the diaphragm
  • the magnetizing direction of the permanent magnet is perpendicular
  • the magnetization direction of the center magnet 21 and the side magnets 31 is the vertical direction
  • the magnetization direction of the permanent magnet is horizontal direction.
  • the magnetizing directions of the center magnet 21 and the side magnets 31 are opposite.
  • the central magnetic component includes at least two first magnets 23 corresponding to the two first sides of the central magnet 21, and the two first magnets 23 are spaced apart from each other.
  • the central magnetic component includes four first magnets 23 corresponding to the two first sides and two second sides of the central magnet 21, and the four first magnets 23 are spaced apart from each other. And the edges of the four first magnets 23 close to the magnetic gap are aligned with the edges of the central magnet 21.
  • the magnetic pole of the first magnet 23 close to the magnetic gap and the magnetic pole of the central magnet 21 arranged side by side away from the bottom wall of the magnetic yoke 1
  • the polarity of the end of the first magnet 23 away from the magnetic gap is the same as that of the end of the central magnet 21 arranged in parallel close to the bottom wall of the yoke 1.
  • each of the first magnets 23 includes a rectangular portion 231 located close to the magnetic gap and a trapezoidal portion 232 located away from the magnetic gap.
  • the trapezoidal portion 232 includes two hypotenuses.
  • the oblique sides of the trapezoidal portions 232 of two adjacent first magnets 23 are opposite and spaced apart. This design increases the volume of the first magnet 23 as much as possible, facilitates the positioning of the first magnet 23 during assembly, and facilitates the assembly with other parts.
  • the side magnetic circuit portion includes two side magnets 31 and two second magnets 32 located outside the two first sides of the center magnet 21, and the two second magnets 32 are independent of each other. Structure, or the two second magnetic conductors 32 are connected to form an integral structure through a connecting portion; or, the side magnetic circuit part includes four sides located outside the two first sides and the two second sides of the central magnet 21 There are two side magnets 31 and four second magnetic conductors 32, the four second magnetic conductors 32 are mutually independent structures, or the four second magnetic conductors 32 are connected to form an integral structure through a connecting portion.
  • the four second magnetizers 32 can be combined with the housing by injection molding through one positioning.
  • a first magnet 23 perpendicular to the magnetizing direction of the central magnet 21 above the vertically magnetized central magnet 21 the flow direction of the magnetic lines of induction can be restricted and the magnetic gap of the magnetic gap can be increased.
  • Fig. 10 shows the distribution of magnetic lines of induction of the magnetic circuit system in this embodiment
  • Fig. 2 shows the distribution of magnetic lines of induction of the magnetic circuit system in the prior art, as shown in Figs. 10 and 2, respectively.
  • the magnetic flux density in the first magnet 23 is increased, and the magnetic flux density in the magnetic gap portion in this embodiment is significantly increased.
  • the central magnetic component in this embodiment is a permanent magnet
  • the side magnetic component is also a permanent magnet.
  • the arrow direction is the magnetizing direction
  • the magnetizing directions of the center magnet 21 and the side magnets 31 are parallel to the vibration direction of the diaphragm
  • the magnetizing direction of the permanent magnets is perpendicular Regarding the vibration direction of the diaphragm, according to the position state of the sounding device shown in FIG. 11, it can also be understood that the magnetization direction of the center magnet 21 and the side magnets 31 is the vertical direction, and the magnetization direction of the permanent magnet is horizontal direction. Wherein, the magnetizing directions of the center magnet 21 and the side magnets 31 are opposite.
  • the magnetic pole of the first magnet 23 close to the magnetic gap and the magnetic pole of the central magnet 21 arranged side by side away from the bottom wall of the magnetic yoke 1
  • the polarity of the end of the first magnet 23 away from the magnetic gap is the same as that of the end of the central magnet 21 arranged in parallel close to the bottom wall of the yoke 1.
  • the poles of the second magnet 33 near the end of the magnetic gap and the side magnets 31 arranged side by side far from the bottom wall of the magnetic yoke 1 have the same polarity.
  • the magnetic pole at one end of the magnetic gap has the same polarity as the magnetic pole at one end of the side magnets 31 arranged in parallel close to the bottom wall of the yoke 1.
  • the central magnetic component includes two first magnets 23 corresponding to the two first sides of the central magnet 21, and the two first magnets 23 are spaced apart from each other, or include two first magnets 23 corresponding to the two first sides of the central magnet 21. Two first sides and two second sides of the four first magnets 23 correspond to each other, and the four first magnets 23 are spaced apart from each other. Wherein, the edge of one side of the first magnet 23 close to the magnetic gap is aligned with the edge of the central magnet 21. With the design of two first magnets 23 or the design of four first magnets 23, the magnetizing process is simple and the reliability of the magnets is high.
  • each of the first magnets 23 includes a rectangular portion located close to the magnetic gap and a trapezoidal portion located away from the magnetic gap.
  • the trapezoidal portion includes two oblique sides adjacent to each other. The oblique sides of the trapezoidal parts of the two first magnets 23 are opposite and spaced apart. This design increases the volume of the first magnet 23 as much as possible, facilitates the positioning of the first magnet 23 during assembly, and facilitates the assembly with other parts.
  • the side magnetic circuit part includes two side magnets 31 and two second magnets 33 located outside the two first sides of the center magnet 21; or, the side magnetic circuit part includes two magnets located at the center.
  • Two second magnets 33 are arranged at intervals, or four second magnets 33 are arranged at intervals.
  • the magnetizing process is simple, and on the other hand, gaps are formed between the four second magnets 33 to form a connection between the inside and outside of the sound generating device.
  • the channel structure is conducive to the smooth vibration of the diaphragm, and the notch at the corner can provide accommodation space for the bending section of the voice coil lead, and there is no need to reserve a separate horizontal or longitudinal space for the voice coil lead.
  • Fig. 2 is a distribution diagram of magnetic lines of induction of the magnetic circuit system in the prior art, as shown in Figs.
  • the difference between the sound generating device in this embodiment and the third embodiment is that: the central magnetic component and the edge magnetic component in this embodiment use permanent magnets, and combined with the arrow in FIG.
  • the magnetization direction indicated by the direction is located on both sides of the magnetic gap.
  • the magnetization directions of the center magnet 21 and the side magnets 31 are in a direction inclined with respect to the vibration direction of the diaphragm, and the center magnet 21
  • the magnetization direction of the side magnet 31 forms a first angle with the magnetization direction of the side magnet 31, and the opening direction of the first angle is away from the bottom wall of the magnetic yoke 1;
  • the central magnetic component and the side magnet The magnetizing direction of the component is in a direction that is inclined relative to the plane of the bottom wall of the magnetic yoke 1, and the magnetizing direction of the central magnetic component and the magnetizing direction of the side magnetic components form a second angle, so
  • the opening direction of the second included angle faces the bottom wall of the magnetic yoke 1.
  • the magnetization directions of the center magnet 21 and the side magnets 31 are inclined at an angle greater than or equal to 0° and less than or equal to 45° with respect to the vibration direction of the diaphragm; the central magnetic component and the side magnets
  • the angle of the magnetization direction of the component relative to the plane of the bottom wall of the magnetic yoke 1 is greater than 0° and less than or equal to 45°.
  • the magnetization directions of the center magnet 21 and the side magnets 31 are parallel to the vibration direction of the diaphragm, that is, in the vertical direction, and the magnetization directions of the center magnet 21 and the side magnets 31 in contrast.
  • the magnetizing directions of the central magnetic component and the side magnetic components are inclined at an angle of greater than 0° and less than or equal to 45° with respect to the plane where the bottom wall of the magnetic yoke 1 is located.
  • the center magnet 21 is parallel to the vibration direction of the diaphragm, that is, in the vertical direction, the magnetization direction of the side magnets 31 is inclined with respect to the vibration direction of the diaphragm.
  • the angle is greater than 0° and less than or equal to 45°, and the magnetizing direction of the central magnetic component and the side magnetic component are inclined at an angle of greater than 0° and less than or equal to 45 relative to the plane of the bottom wall of the magnetic yoke 1 °.
  • the central magnetic component includes two first magnets 23 corresponding to the two first sides of the central magnet 21, and the two first magnets 23 are spaced apart from each other, or include The two first sides and the two second sides of the central magnet 21 correspond to four first magnets 23, and the four first magnets 23 are spaced apart from each other, wherein the side of the first magnet 23 close to the magnetic gap The edge is aligned with the edge of the central magnet 21.
  • the side magnetic circuit portion includes two side magnets 31 and two second magnets 33 located outside the two first sides of the center magnet 21; or, the side magnetic circuit portion includes two side magnets located on the center magnet 21.
  • Two second magnets 33 are arranged at intervals, or four second magnets 33 are arranged at intervals.
  • the magnetizing process is simple, and on the other hand, gaps are formed between the four second magnets 33 to form a connection between the inside and outside of the sound generating device.
  • the channel structure is conducive to the smooth vibration of the diaphragm, and the notch at the corner can provide accommodation space for the bending section of the voice coil lead, and there is no need to reserve a separate horizontal or longitudinal space for the voice coil lead.
  • a first magnet 23 that is magnetized in a vertical or relatively vertical direction is added above the central magnet 21 that is magnetized in a vertical or relatively vertical direction.
  • a second magnet 33 that is magnetized obliquely with respect to the horizontal direction is added above the side magnet 31 that is magnetized in an oblique direction, which can restrict the flow direction of the magnetic line of induction, adjust the distribution of the magnetic line of induction in the magnetic gap, and reduce the side magnetic circuit part.
  • Fig. 15 is a distribution diagram of magnetic line of force of the magnetic circuit system in this embodiment
  • Fig. 2 is a distribution diagram of magnetic line of force of the magnetic circuit system in the prior art, as shown in Fig. 15 and Fig. 2.
  • the magnetic flux density in the first magnet 23 and the second magnet 33 increases, and the magnetic flux density in the magnetic gap is distributed as Change, and the magnetic short-circuit phenomenon of the side magnetic circuit part in this embodiment is significantly improved.
  • the simulation results show that the BL value of the sounding device in this embodiment is greatly improved compared to the prior art.
  • the curve E is the BL curve of the sounding device of this embodiment.
  • Curve A is the BL curve of the prior art sounding device.
  • the BL value of the prior art sounding device is 0.78, while the BL value of the sounding device of this embodiment is increased to 0.88.
  • this embodiment The driving force of the magnetic field is higher, the acoustic sensitivity of the sound device is higher, and the acoustic performance is better.
  • the curves E1, E2, E3, E4 are four BL curves obtained after adjusting the magnetization direction of at least one of the center magnet 21, the side magnet 31, the first magnet 23, and the second magnet 33
  • Curve A is the BL curve of the prior art sounding device.
  • the symmetry of the BL curve can also be adjusted to match the stiffness K MS curve of the vibration system to improve distortion and enhance the acoustic performance of the sound device.
  • the method of adjusting the symmetry of the BL curve by adjusting the magnetizing direction is simpler than the method of changing the voice coil structure or changing the entire magnetic circuit structure in the prior art, which greatly reduces the production cost.

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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)

Abstract

La présente invention concerne un dispositif de génération de son. Le système de circuit magnétique comprend : une culasse conductrice magnétique ; et une partie de circuit conducteur magnétique centrale et une partie de circuit conducteur magnétique latérale qui sont disposées sur la culasse conductrice magnétique. Un entrefer magnétique est formé entre la partie de circuit magnétique centrale et la partie de circuit magnétique latérale, la partie de circuit magnétique centrale comprenant un aimant central et un composant magnétique central qui sont disposés en parallèle de bas en haut ; la partie de circuit magnétique latéral comprend un aimant latéral et un composant magnétique latéral qui sont disposés en parallèle de bas en haut ; les polarités des pôles magnétiques de l'aimant central et de l'aimant latéral au niveau d'une extrémité proche de la paroi inférieure de la culasse conductrice magnétique sont différentes, et les polarités des pôles magnétiques à une extrémité éloignée de la culasse conductrice magnétique sont également différentes ; au moins l'un parmi le composant magnétique central et le composant magnétique latéral est un aimant permanent, et les polarités d'un pôle magnétique au niveau d'une extrémité de l'aimant permanent qui est proche de l'entrefer magnétique et un pôle magnétique de l'aimant central ou de l'aimant latéral disposé en parallèle à une extrémité éloignée de la paroi inférieure de la culasse conductrice magnétique sont identiques. Le dispositif de génération de son dans la présente invention présente une meilleure performance acoustique.
PCT/CN2019/128435 2019-06-03 2019-12-25 Dispositif de génération de son WO2020244208A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201910477379.8A CN110149575B (zh) 2019-06-03 2019-06-03 一种发声装置
CN201910477379.8 2019-06-03

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WO2020244208A1 true WO2020244208A1 (fr) 2020-12-10

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