Sound production device and electronic equipment

Abstract

The invention discloses a sound production device and electronic equipment, the sound production device comprises a frame and a sound production single body, the sound production single body comprises a vibration system and a magnetic circuit system, the magnetic circuit system comprises a magnetic conductive yoke and a central magnetic part and a side magnetic part which are spaced to form a magnetic gap, and the central magnetic part comprises a first magnetic group, a second magnetic group and a third magnetic group which are stacked; the vibration system comprises a vibrating diaphragm with an inner ring hole and a voice coil connected to the vibrating diaphragm, the voice coil is arranged corresponding to the magnetic gap, and at least part of the third magnetic group is convexly arranged in the inner ring hole; the number of the sound production monomers is two, the two sound production monomers are respectively connected to two opposite sides of the frame, the vibrating diaphragms of the two sound production monomers are oppositely arranged, and the third magnetic groups of the two sound production monomers abut against each other; the frame and the two sound production single bodies jointly form a sound production front cavity in an enclosing mode, and the sound production front cavity is communicated with the first sound hole. Because the two sound production monomers are mutually supported through the magnetic circuit system, the reliability drop margin of the sound production device can be increased, and the performance of the whole machine can be greatly improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of electroacoustic conversion, and particularly relates to a sound-generating device and an electronic device. Background Art

[0002] With the recent development of electronic devices, the demand for thinner and lighter electronic products has become increasingly stringent. Consequently, the size requirements for sound-generating devices have also increased. At the same time, the performance requirements for sound-generating devices have also increased. Therefore, improving performance within the constraints of structural size is a technical problem that needs to be urgently addressed.

[0003] Therefore, in view of the above shortcomings, the present invention is specially proposed. Summary of the Invention

[0004] The object of the present invention is to provide a sound-generating device and an electronic device to at least partially solve the above-mentioned technical problems in the prior art.

[0005] A first aspect of the present invention provides a sound-generating device, comprising:

[0006] a frame, the frame being formed in a hollow frame shape, and a first sound hole being formed on a side wall of the frame;

[0007] A sound-producing unit includes a vibration system and a magnetic circuit system; the magnetic circuit system includes a magnetic yoke and a central magnetic portion and a side magnetic portion provided on the magnetic yoke, the side magnetic portion being arranged around the central magnetic portion and spaced apart from the central magnetic portion to form a magnetic gap; the central magnetic portion includes a first magnetic group, a second magnetic group, and a third magnetic group stacked along the vibration direction of the vibration system, the first magnetic group being connected to the magnetic yoke; the vibration system includes a diaphragm having an inner annular hole and a voice coil connected to the diaphragm, the voice coil being arranged corresponding to the magnetic gap, and at least a portion of the third magnetic group being protruding from the inner annular hole;

[0008] Among them, there are two sound-emitting units, and the two sound-emitting units are respectively connected to the opposite sides of the frame, and the diaphragms of the two sound-emitting units are arranged opposite to each other, and the third magnetic groups of the two sound-emitting units are against each other; the frame and the two sound-emitting units together enclose a sound front cavity, and the sound front cavity is connected to the first sound hole.

[0009] The sound-generating device provided by the present invention may also have the following additional technical features:

[0010] In a specific embodiment of the present invention, the central magnetic portion forms a Halbach magnetic circuit, and the side of the central magnetic portion facing the voice coil is a magnetic field enhancement side.

[0011] In a specific embodiment of the present invention, the first magnetic group and the third magnetic group are magnetized along the vibration direction of the vibration system and in opposite directions, the magnetization direction of the second magnetic group is perpendicular to the magnetization directions of the first magnetic group and the third magnetic group, and the magnetic pole of the second magnetic group facing the voice coil is the same as the magnetic pole of the first magnetic group facing the second magnetic group.

[0012] The edge magnet portion includes stacked edge magnets and edge magnetic conductive plates, the edge magnets are connected to the magnetic conductive yoke; the edge magnets are magnetized along the vibration direction of the vibration system, and the magnetization direction of the first magnetic group is opposite to the magnetization direction of the edge magnets of the edge magnet portion; wherein,

[0013] The magnetization directions of the two third magnetic groups are opposite.

[0014] In a specific embodiment of the present invention, the first magnetic group includes a first magnet having an integral plate-shaped structure; or, the first magnetic group includes a plurality of first magnets, wherein the plurality of first magnets are adjacently arranged and located between the second magnetic group and the magnetic yoke; wherein the plurality of first magnets are magnetized along the vibration direction of the vibration system, and the plurality of first magnets have the same magnetization direction;

[0015] And / or, the voice coil is in a rectangular ring shape, having a long side and a short side connected end to end; the second magnetic group includes two second magnets and two third magnets, the two second magnets are adjacent and arranged in parallel along the short side, the two third magnets are arranged at both ends of the two second magnets along the long side, the two second magnets are magnetized in opposite directions, and the two third magnets are magnetized in opposite directions;

[0016] And / or, the third magnetic group includes a central magnet and an edge portion, the edge portion is arranged around the outer circumference of the central magnet, the side of the central magnet facing away from the second magnetic group protrudes, the side of the edge portion facing away from the second magnetic group forms a protrusion, and the protrusion is protruded from the inner ring hole; wherein, the edge portion is a permanent magnet, and its magnetization direction is the same as the magnetization direction of the central magnet; or, the edge portion is a non-magnetic material bracket; or, the edge portion forms a closed integral ring structure; or, the edge portion includes a plurality of adjacent edge portions, and the adjacent edge portions are connected end to end to form a closed ring structure; or, the edge portion is a permanent magnet and is an integrally formed structure with the central magnet.

[0017] In a specific embodiment of the present invention, a projection of at least part of the second magnetic group along a vibration direction perpendicular to the vibration system coincides with a projection of the voice coil along a vibration direction perpendicular to the vibration system;

[0018] And / or, the voice coils of the two sound-emitting units are arranged opposite to each other along the vibration direction of the vibration system, and the two voice coils have the same size.

[0019] In a specific embodiment of the present invention, the sound-emitting unit further includes a shell, the edge magnetic portion includes a stacked edge magnet and an edge magnetic plate, the edge magnet is connected to the magnetic yoke; one side of the shell is connected to the edge magnetic plate, and the other side of the shell is connected to the periphery of the diaphragm, wherein:

[0020] The shell is an annular plastic bracket, and the shell is combined with the side magnetic conductive plate by injection molding; or the shell is formed by bending and extending the periphery of the side magnetic conductive plate.

[0021] In a specific embodiment of the present invention, the vibration system further includes a frame, the frame including a main body and a connecting portion connected to a periphery of the main body, the main body being provided between the diaphragm and the voice coil;

[0022] The vibration system also includes a centering support plate, which includes an external fixing portion, an internal fixing portion, and an elastic arm portion connecting the external fixing portion and the internal fixing portion. The external fixing portion is connected to the shell and / or the edge magnetic portion, and the internal fixing portion is connected to the connecting portion.

[0023] In a specific embodiment of the present invention, the vibration system also includes a skeleton, which is arranged between the diaphragm and the voice coil; the diaphragm includes an inner ring portion, a first fold ring arranged around the inner ring portion, a straight portion arranged around the first fold ring, a second fold ring arranged around the straight portion, and a fixed portion connected to the outer side of the second fold ring, the fixed portion is connected to the shell, the straight portion is connected to the skeleton, the inner ring portion is formed with the inner ring hole, and the inner ring portion is connected to the third magnetic group.

[0024] In a specific embodiment of the present invention, the inner ring portion, the first fold ring, the straight portion, the second fold ring and the fixing portion are an integrally formed structure;

[0025] And / or, the first fold ring protrudes in a direction away from the magnetic yoke, and the second fold ring protrudes in a direction close to the magnetic yoke;

[0026] And / or, the diaphragm further comprises a reinforcement portion, wherein the reinforcement portion is provided between the straight portion and the frame;

[0027] And / or, the fixing portion is connected to the shell, and one end of the fixing portion away from the second fold ring is bent and extended toward the shell to form a bent portion, and the bent portion is connected to the outer wall of the shell.

[0028] The second aspect of the present invention also provides an electronic device, comprising a sound-emitting device and a shell as described in any one of the above items, wherein the shell is formed with a receiving cavity and a second sound hole connected to the receiving cavity, the sound-emitting device is arranged in the receiving cavity, and the first sound hole is connected to the second sound hole.

[0029] The second aspect of the present invention also provides an electronic device, comprising a sound-emitting device and a shell as described in any one of the above items, wherein the shell is formed with a receiving cavity and a second sound hole connected to the receiving cavity, the sound-emitting device is arranged in the receiving cavity, and the first sound hole is connected to the second sound hole.

[0030] In the sound-generating device provided by this invention, since the two sound-generating units are connected to the frame with their diaphragms facing each other, the superposition of the two sound waves doubles the loudness, significantly enhancing the sound quality of the device. Furthermore, the simple and regular structure of the sound-generating front cavity facilitates focused sound propagation, thereby improving the mid- and high-frequency performance of the device. Furthermore, since the two sound-generating units are mutually supported by the magnetic circuit system, the reliability drop margin of the device is increased, significantly enhancing the overall performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 Schematic diagram of the three-dimensional structure of the sound-generating device in an embodiment of the present invention;

[0033] Figure 2 for Figure 1 Structural breakdown diagram;

[0034] Figure 3 for Figure 1 Exploded diagram of the structure of the sound generating device;

[0035] Figure 4 for Figure 1 Exploded diagram of the structure of the magnetic circuit system;

[0036] Figure 5 is a schematic structural diagram of an electronic device according to an embodiment of the present invention;

[0037] Figure 6 This is a simulation diagram of the sound unit in an embodiment of the present invention.

[0038] Description of reference numerals:

[0039] 100-sounding device; 10-frame, 11-first sound hole;

[0040] 20-magnetic circuit system; 21-magnetic yoke; 22-center magnetic portion; 221-first magnetic group, 2211-first magnet; 222-second magnetic group; 2221-second magnet; 2222-third magnet; 223-third magnetic group; 2232-center magnet; 2233-edge portion; 2234-protrusion; 23-edge magnetic portion; 231-edge magnet; 232-edge magnetic plate; 24-magnetic gap;

[0041] 30 - Vibration system; 31 - Diaphragm; 311 - Inner ring; 312 - Inner ring hole; 313 - First fold; 314 - Straight portion; 315 - Second fold; 316 - Fixed portion; 317 - Bend portion; 32 - Voice coil; 33 - Skeleton; 331 - Main body; 332 - Connecting portion; 34 - Centering support; 341 - External fixing portion; 342 - Internal fixing portion; 343 - Elastic arm;

[0042] 40 - shell, 50 - outer shell, 51 - second sound hole, 53 - third sound hole. DETAILED DESCRIPTION

[0043] Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. Rather, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0044] It should be understood that the terms used herein are for the purpose of describing specific example embodiments only and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "comprise", "include", "contain" and "have" are inclusive and therefore specify the presence of stated features, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the specific order described or illustrated, unless the order of execution is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0045] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates otherwise, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0046] For ease of description, spatially relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figures, such as "inside," "outside," "inside," "outside," "below," "beneath," "above," and the like. Such spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is flipped, an element described as "below" or "below" another element or feature would then be oriented as "above" or "above" another element or feature. Thus, the example term "below" can include both above and below orientations. The device may be otherwise oriented (rotated 90 degrees or in other orientations) and the spatially relative descriptors used herein are interpreted accordingly.

[0047] Reference Figure 1-6 In a first aspect, the present invention provides a sound-generating device 100, characterized in that it includes a frame 10 and a sound-generating unit, wherein the frame 10 is formed in a hollow frame shape, and a first sound hole 11 is formed on the side wall of the frame 10; the sound-generating unit includes a vibration system 30 and a magnetic circuit system 20; the magnetic circuit system 20 includes a magnetic yoke 21 and a central magnetic portion 22 and an edge magnetic portion 23 provided on the magnetic yoke 21, the edge magnetic portion 23 is arranged in an annular manner on the central magnetic portion 22, and is spaced from the central magnetic portion 22 to form a magnetic gap 24, and the central magnetic portion 22 includes a first magnetic group 221 and a second magnetic group 221 stacked along the vibration direction of the vibration system 30. 22 and the third magnetic group 223, the first magnetic group 221 is connected to the magnetic yoke 21; the vibration system 30 includes a diaphragm 31 with an inner ring hole 312 and a voice coil 32 connected to the diaphragm 31, the voice coil 32 is arranged corresponding to the magnetic gap 24, and at least part of the third magnetic group 223 is protruded from the inner ring hole 312; wherein, there are two sounding units, the two sounding units are respectively connected to the opposite sides of the frame 10, and the diaphragms 31 of the two sounding units are arranged oppositely, and the third magnetic groups 223 of the two sounding units are against each other; the frame 10 and the two sounding units together enclose a sound front cavity, and the sound front cavity is connected to the first sound hole 11.

[0048] In this embodiment, the sound-generating device 100 may be a speaker, which may be a micro speaker. Of course, the sound-generating device 100 may also be a speaker module, that is, a sound module structure, which is not limited here.

[0049] The frame 10 is configured as an annular hollow structure formed by connecting a plurality of side walls end to end. Optionally, the frame 10 is formed in a rectangular shape. A first sound hole 11 is provided on one side wall of the frame 10 .

[0050] The sound unit includes a magnetic circuit system 20 and a vibration system 30 that are arranged opposite to each other and fixedly connected. Optionally, the magnetic circuit system 20 and the vibration system 30 are both arranged in a rectangular shape.

[0051] The vibration system 30 includes a rectangular diaphragm 31 and a voice coil 32 connected to the diaphragm 31, wherein an inner ring hole 312 is formed in the center of the diaphragm 31 for the magnetic circuit system 20 to protrude. At least part of the magnetic circuit system 20 protrudes from the inner ring hole 312 in the center of the vibration system 30. This can further reduce the Z-direction size of the sound unit. By utilizing the Z-direction height of the sound unit itself, the Z-direction height of the magnetic circuit system 20 of the sound unit can be increased.

[0052] The magnetic circuit system 20 includes a magnetic yoke 21, a central magnetic portion 22, and side magnetic portions 23 disposed on the yoke 21. Specifically, the magnetic yoke 21 is arranged parallel to the diaphragm 31. The central magnetic portion 22 and side magnetic portions 23 are both connected to the side of the magnetic yoke 21 facing the diaphragm 31. The side magnetic portion 23 surrounds the central magnetic portion 22, forming a magnetic gap with the voice coil 32. This magnetic gap provides a magnetic field for the voice coil 32, driving the energized voice coil 32 to vibrate, thereby driving the diaphragm 31 to produce sound.

[0053] The central magnetic portion 22 includes a first magnetic group 221, a second magnetic group 222, and a third magnetic group 223 stacked on the magnetic yoke 21 along the vibration direction of the vibration system 30. The first magnetic group 221 is connected to the magnetic yoke 21, and the third magnetic group 223 at least partially protrudes from the inner annular hole 312. This can help increase the magnetic field strength of the central magnetic portion 22 by adjusting the magnetic field directions of the first magnetic group 221, the second magnetic group 222, and the third magnetic group 223. This can help improve the B value of the magnetic circuit system 20, increase the BL value of the speaker, and enhance the sensitivity of the speaker.

[0054] The two sound-emitting units are respectively connected to opposite sides of the frame 10 in a manner that the vibration system 30 is opposite, and the two third magnetic groups 223 protruding from the inner ring hole 312 in the two sound-emitting units are arranged to abut against each other, that is, the two sound-emitting units are arranged in a mirror image. The two sound-emitting units and the side walls of the frame 10 together form a sound front cavity, and the sound front cavity is connected to the first sound hole 11. It can be understood that since the two sound-emitting units are connected to the frame 10 in a manner that the diaphragms 31 are opposite, the sound waves on both sides are superimposed, and the loudness is doubled, which can greatly improve the sound effect of the sound-emitting device 100; at the same time, the sound front cavity has a simple and regular structure, which helps to focus the sound and propagate, thereby improving the mid- and high-frequency performance of the sound-emitting device 100. In addition, since the two sound-emitting units are also supported by each other through the magnetic circuit system 20, the reliability drop margin of the sound-emitting device 100 can be increased, thereby greatly improving the performance of the entire device.

[0055] In some embodiments, the central magnetic portion 22 forms a Halbach magnetic circuit, with the side of the central magnetic portion 22 facing the voice coil 32 serving as the magnetic field enhancement side. The central magnetic portion 22 forms a Halbach magnetic array, capable of generating a strong magnetic field. The magnetic field generated by the Halbach magnetic array drives the voice coil 32, which in turn drives the diaphragm 31 to vibrate and produce sound. This creates a strong magnetic field at the voice coil 32, increasing the density of the magnetic flux in the magnetic gap 24, the number of magnetic flux lines passing through the voice coil 32, and the magnetic force acting on the voice coil 32, effectively improving the BL value and enhancing the sensitivity of the speaker. Furthermore, the Halbach magnetic array ensures a uniform distribution of magnetic flux lines at the voice coil 32 and excellent linearity in the magnetic field variation along the vibration direction of the diaphragm 31. This effectively improves the flatness of the BL curve, significantly enhancing the FR frequency response curve and effectively reducing harmonic distortion (THD). This effectively improves the sound quality of the audio output by the speaker, enhances the treble effect, and, to a certain extent, alleviates distortion in the audio output by the speaker, ultimately enhancing the overall sound quality and performance of the device.

[0056] Of course, in other embodiments, the central magnetic portion 22 can also adopt other structures, for example, the central magnetic portion includes a first magnetic group, a central magnetic conductive plate and a third magnetic group that are stacked, and the first magnetic group and the third magnetic group are magnetized along the vibration direction of the vibration system 30 and the magnetic field directions are opposite.

[0057] In some embodiments, the first magnetic group 221 and the third magnetic group 223 are both magnetized along the vibration direction of the vibration system 30 and the magnetization directions are opposite, the magnetization direction of the second magnetic group 222 is perpendicular to the magnetization directions of the first magnetic group 221 and the third magnetic group 223, and the magnetic pole of the second magnetic group 222 facing the voice coil 32 is the same as the magnetic pole of the first magnetic group 221 facing the second magnetic group 222; the edge magnetic portion 23 includes a stacked edge magnet 231 and a edge magnetic plate 232, and the edge magnet 231 is connected to the magnetic yoke 21; the edge magnet 231 is magnetized along the vibration direction of the vibration system 30, and the magnetization direction of the first magnetic group 221 is opposite to the magnetization direction of the edge magnet 231 of the edge magnetic portion 23; wherein, the magnetization directions of the two third magnetic groups 223 are opposite.

[0058] As can be understood, the magnetization direction of the first magnetic group 221 is opposite to that of the third magnetic group 223. This allows the magnetic flux lines of the first and third magnetic groups 221, 223 of the central magnetic portion 22 to converge on the second magnetic group 22. The central magnetic portion 22 generates a stronger magnetic field that passes through the magnetic gap 24, thereby increasing the density of the magnetic flux in the magnetic gap 24 and the number of magnetic flux lines passing through the voice coil 32. This increases the magnetic field force acting on the voice coil 32, effectively improving the BL value. Furthermore, the opposite magnetization directions of the two third magnetic groups 223 and the two side magnets 231 further facilitate the concentrated distribution of magnetic flux lines, reduce magnetic leakage, and improve FR performance.

[0059] This embodiment defines the magnetization direction of each magnetic group in the central magnetic portion 22 and the side magnets 231 in the side magnetic portion 23, thereby forming a Halbach magnetic circuit. This in turn strengthens the magnetic field on the side of the central magnetic portion 22 facing the voice coil 32, thereby increasing the density of the magnetic flux in the magnetic gap 24, the number of magnetic flux lines passing through the voice coil 32, and the magnetic field force acting on the voice coil 32. This effectively improves the BL value, enhances the sensitivity of the speaker, and effectively improves the flatness of the BL curve, significantly improving the FR frequency response curve and effectively reducing harmonic distortion (THD), thereby further enhancing the overall sound quality and performance. Furthermore, by setting the magnetization directions of the two third magnetic groups 223 in the two speaker units in opposite directions, the magnetic flux lines of the two third magnetic groups 233 repel each other, further allowing more magnetic flux lines of each magnetic circuit system 20 to form a closed magnetic loop, thereby increasing the magnetic field strength.

[0060] In some embodiments, the first magnetic group 221 includes an integral plate-shaped first magnet 2211. This configuration facilitates the processing, assembly, and magnetization of the first magnet 2211, thereby effectively improving production and assembly efficiency.

[0061] In some embodiments, the first magnetic group 221 includes multiple first magnets 2211, which are arranged adjacent to each other and located between the second magnetic group 222 and the magnetic yoke 21; wherein the multiple first magnets 2211 are all magnetized along the vibration direction of the vibration system 30, and the magnetization directions of the multiple first magnets 2211 are the same.

[0062] The first magnetic group 221 includes a plurality of first magnets 2211, which are arranged flatly between the magnetic yoke 21 and the second magnetic group 222. The plurality of first magnets 2211 are magnetized in a vertical direction and in the same magnetization direction. That is, the plurality of first magnets 2211 are magnetized simultaneously upward or downward along the direction of movement of the voice coil 32, which is not limited here.

[0063] The voice coil 32 is rectangular, having a long side and a short side connected end to end. Optionally, multiple first magnets 2211 are arranged adjacently and in parallel along the long sides; alternatively, multiple first magnets 2211 are arranged adjacently and in parallel along the short sides; alternatively, some first magnets 2211 are arranged adjacently and in parallel along the long sides, while another portion of first magnets 2211 is arranged at both ends of a portion of first magnets 22112 along the short sides, or vice versa, without limitation.

[0064] In some embodiments, the second magnetic group 222 is magnetized along a vibration direction perpendicular to the vibration system 30, and the magnetization direction of the second magnetic group 222 is along the periphery of the second magnetic group 222 toward the center of the second magnetic group 222; or, the second magnetic group 222 has a first axis and a second axis perpendicular to the vibration direction of the vibration system 30, and the first axis and the second axis are perpendicular to each other, and the magnetization direction of the second magnetic group 222 is along the first axis and / or the second axis.

[0065] The vibration direction of the vibration system 30 can be selected as a vertical direction, and the vibration direction perpendicular to the vibration system 30 can be selected as a horizontal direction. When the second magnetic group 222 is magnetized in the horizontal direction, the magnetization direction of the second magnetic group 222 can be from the voice coil 32 to the center of the second magnetic group 222, that is, the south pole of the second magnetic group 222 faces the voice coil 32, and the north pole is located at the center of the second magnetic group 222; alternatively, the magnetization direction of the second magnetic group 222 can be from the center of the second magnetic group 222 to the voice coil 32, that is, the south pole of the second magnetic group 222 is located at the center of the second magnetic group 222, and the north pole faces the voice coil 32; alternatively, the magnetization direction of the second magnetic group 222 can be along the cross axis, which is not limited here.

[0066] When the magnetization direction of the second magnetic group 222 is from the center of the second magnetic group 222 to the periphery of the second magnetic group 222, the first magnetic group 221 of the central magnetic portion 22 is magnetized from bottom to top, and the third magnetic group 223 is magnetized from top to bottom. When the magnetization direction of the second magnetic group 222 is from the periphery of the second magnetic group 222 to the center of the second magnetic group 222, the first magnetic group 221 of the central magnetic portion 22 is magnetized from top to bottom, and the third magnetic group 223 is magnetized from bottom to top, which is not limited here.

[0067] In some embodiments, the second magnetic group 222 is magnetized along a vibration direction perpendicular to the vibration system 30, and the magnetization direction of the second magnetic group 222 is along the periphery of the second magnetic group 222 toward the center of the second magnetic group 222; or, the second magnetic group 222 has a first axis and a second axis perpendicular to the vibration direction of the vibration system 30, and the first axis and the second axis are perpendicular to each other, and the magnetization direction of the second magnetic group 222 is along the first axis and / or the second axis; the magnetic pole on the inner side of the second magnetic group 222 near its center is the same as the magnetic pole of the first magnetic group 221 on the side away from the second magnetic group 222.

[0068] Optionally, the second magnetic group 222 includes two second magnets 2221 and two third magnets 2222, the two second magnets 2221 are adjacent and arranged in parallel along the short side direction, and the two third magnets 2222 are arranged at both ends of the two second magnets 2221 along the long side direction. The two second magnets 2221 and the two third magnets 2222 are magnetized along the short side direction and the long side direction respectively, the magnetization directions of the two second magnets 2221 are opposite, and the magnetization directions of the two third magnets 2222 are opposite.

[0069] The two second magnets 2221 and the two third magnets are magnetized in the horizontal direction, the magnetization directions of the two second magnets 2221 are opposite, the magnetization directions of the two third magnets 2222 are opposite, and the magnetization directions of the two second magnets 2221 and the two third magnets 2222 are perpendicular to their respective length extension directions. The polarity of the ends of the two second magnets 2221 and the two third magnets 2222 facing the voice coil 32 are both N poles or both S poles, which are not limited here.

[0070] In some embodiments, the third magnetic group 223 includes a central magnet 2232 and an edge portion 2233. The edge portion 2233 is disposed around the outer periphery of the central magnet 2232. The side of the central magnet 2232 facing away from the second magnetic group 222 protrudes from the edge portion 2233, which forms a protrusion 2234 on the side facing away from the second magnetic group 222. The protrusion 2234 protrudes from the inner annular hole 312. In this way, the Z-direction height of the sound unit itself can be utilized to increase the Z-direction height of the magnetic circuit system 20, thereby further reducing the Z-direction dimension of the sound unit while maintaining the performance of the sound unit, thereby further reducing the Z-direction dimension of the sound unit, and further reducing the Z-direction dimension of the sound device 100.

[0071] Optionally, the edge portion 2233 is a permanent magnet whose magnetization direction is the same as that of the center magnet 2232; or, the edge portion 2233 is a non-magnetic support. The flat surface of the edge portion 2233 facing away from the second magnetic group 222 is adapted to connect with the portion around the inner annular hole 312 of the diaphragm 31 to form an internal support structure for the diaphragm 31. The support may be a non-magnetic support or a permanent magnet, without limitation.

[0072] Further optionally, the edge portion 2233 forms a closed, integral annular structure; or, the edge portion 2233 includes a plurality of adjacent edge portions 2233 connected end to end to form a closed annular structure; or, the edge portion 2233 includes a plurality of adjacent edge portions 2233 spaced apart to form an annular structure with a gap; or, the edge portion 2233 and the center magnet 2232 are an integrally formed structure.

[0073] The thickness of the central magnet 2232 along the direction of movement of the voice coil 32 may be greater than the thickness of the edge portion 2233 along the direction of movement of the voice coil 32. In other words, the side surface of the central magnet 2232 facing away from the second magnetic group 222 protrudes beyond the side surface of the edge portion 2233 facing away from the second magnetic group 222, thereby forming a protrusion 2234.

[0074] In some embodiments, the magnetization direction of the first magnetic group 221 is opposite to the magnetization direction of the third magnetic group 223. For example, when the first magnetic group 221 is magnetized from bottom to top, the third magnetic group 223 is magnetized from top to bottom, that is, when the N pole of the first magnetic group 221 is at the top and the S pole is at the bottom, the N pole of the third magnetic group 223 is at the bottom and the S pole is at the top; or, when the first magnetic group 221 is magnetized from top to bottom, the third magnetic group 223 is magnetized from bottom to top, that is, when the N pole of the first magnetic group 221 is at the bottom and the S pole is at the top, the N pole of the third magnetic group 223 is at the top and the S pole is at the bottom. This is not limited here.

[0075] In some embodiments, the edge magnet portion 23 includes a stacked edge magnet 231 and a edge magnetic plate 232, and the edge magnet 231 is connected to the magnetic yoke 21; the first magnetic group 221, the third magnetic group 223 and the edge magnet 231 are all magnetized along the vibration direction of the vibration system 30, the magnetization direction of the first magnetic group 221 is opposite to the magnetization direction of the edge magnet 231 of the edge magnet portion 23, and the magnetization direction of the third magnetic group 223 is the same as the magnetization direction of the edge magnet 231 of the edge magnet portion 23.

[0076] The magnetic pole of the side magnet 231 close to the side magnetic plate 232 is opposite to the magnetic pole of the first magnetic group 221 close to the second magnetic group 222, and the magnetic pole of the side magnet 231 close to the side magnetic plate 232 is opposite to the magnetic pole of the third magnetic group 223 close to the second magnetic group 222.

[0077] There are multiple edge magnets 231 and edge magnetic conductive plates 232, and they are arranged in a one-to-one correspondence, and adjacent edge magnets 231 are connected end to end to form a closed annular structure. Alternatively, there are multiple edge magnets 231 and edge magnetic conductive plates 232, and they are arranged in a one-to-one correspondence. Adjacent edge magnets 231 are spaced to form an annular structure with a gap, or the edge magnets 231 form a closed integral annular structure. There are multiple edge magnetic conductive plates 232, and adjacent edge magnetic conductive plates 232 are spaced to form an annular structure with a gap, or adjacent edge magnetic conductive plates 232 are connected end to end to form a closed annular structure, which is not limited here.

[0078] The side magnets 231 of the side magnet portion 23 and the first magnetic group 221 and the third magnetic group 223 of the central magnetic portion 22 are all magnetized in the vertical direction, that is, along the moving direction of the voice coil 32. Optionally, the magnetization direction of the first magnetic group 221 is opposite to the magnetization direction of the side magnets 231 of the side magnet portion 23, and the magnetization direction of the third magnetic group 223 is the same as the magnetization direction of the side magnets 231 of the side magnet portion 23.

[0079] In some embodiments, a projection of at least a portion of the second magnetic group 222 along a direction perpendicular to the vibration direction of the vibration system 30 coincides with a projection of the voice coil 32 along a direction perpendicular to the vibration direction of the vibration system 30 .

[0080] It is understood that this arrangement causes the magnetic flux lines of the first magnetic group 221 and the third magnetic group 223 of the central magnetic portion 22 to converge at the second magnetic group 222 and pass through the magnetic gap, thereby increasing the density of the magnetic flux in the magnetic gap and placing the voice coil 32 in a more reasonable magnetic field, thereby alleviating distortion of the audio output by the sound-generating device 100 and improving the sound quality of the audio output by the sound-generating device 100. Optionally, the horizontal projection of the second magnetic group 222 is located within the horizontal projection of the voice coil 32.

[0081] In some embodiments, the voice coils 32 of the two sound-producing units are positioned opposite each other along the vibration direction of the vibration system 30, and the two voice coils 32 are of identical size. It should be noted that both voice coils 32 are annular, with identical thickness and height dimensions, i.e., mirror images of each other. This helps improve the overall loudness of the sound-producing device.

[0082] In some embodiments, the sound unit also includes a shell 40, one side of the shell 40 is connected to the edge magnetic plate 232, and the other side of the shell 40 is connected to the periphery of the diaphragm 31, wherein the shell 40 is an annular plastic bracket, and the shell and the edge magnetic plate 232 are injection molded together; or, the shell 40 is formed by bending and extending the periphery of the edge magnetic plate 232.

[0083] Specifically, the sound unit also includes a shell 40, which can be selected as a square frame or frame 10 structure, that is, the shell 40 has a cavity with openings at both ends, the magnetic circuit system 20 is connected to one end of the shell 40, and the vibration system 30 is connected to the other end of the shell 40, so that the magnetic circuit system 20, the shell 40 and the vibration system 30 The diaphragm 31 of the vibration system 30 encloses a vibration cavity.

[0084] In some embodiments, the magnetic circuit system 20 can be connected to the housing 40 via the periphery of the magnetic yoke 21; alternatively, the magnetic circuit system 20 can be connected to the housing 40 via the side magnetic plate 232 of the side magnetic portion 23. The diaphragm 31 of the vibration system 30 is connected to the housing 40 at an end away from the magnetic yoke 21, and is opposite and spaced from the magnetic circuit system 20. One end of the voice coil 32 is connected to the diaphragm 31, and the other end of the voice coil 32 is disposed corresponding to the magnetic gap 24.

[0085] At the same time, in this embodiment, the shell 40 is an annular plastic bracket, and the shell is injection-molded with the side magnetic plate 232; or, the shell 40 is formed by bending and extending the periphery of the side magnetic plate 232. This is beneficial to improving the connection strength between the shell 40 and the magnetic circuit system 20, and thereby improving the reliability of the sound unit.

[0086] In some embodiments, the vibration system 30 also includes a skeleton 33, the skeleton 33 includes a main body 331 and a connecting portion 332 connected to the periphery of the main body 331, and the main body 331 is arranged between the diaphragm 31 and the voice coil 32; the vibration system 30 also includes a centering support plate 34, the centering support plate 34 includes an external fixing portion 341, an internal fixing portion 342 and an elastic arm portion 343 connecting the external fixing portion 341 and the internal fixing portion 342, the external fixing portion 341 is connected to the shell 40 and / or the edge magnetic portion 23, and the internal fixing portion 342 is connected to the connecting portion 332.

[0087] In this embodiment, the main body 331 of the skeleton 33 can be an annular structure, that is, the main body 331 is arranged in an annular shape and is arranged around the central magnetic portion 22. Optionally, the main body 331 is arranged in a rectangular ring shape, and the connecting portions 332 include multiple, and the multiple connecting portions 332 are respectively arranged at the four corners of the main body 331.

[0088] As can be appreciated, by providing centering dampers 34, it is possible to utilize them to connect the leads of voice coil 32 to the external circuit and to prevent problems such as swing or polarization of voice coil 32 during vibration. Multiple dampers 34 may be provided, distributed along the major axis and / or minor axis of magnetic circuit system 20 and / or at diagonal or corner locations of magnetic circuit system 20. Optionally, two or four dampers 34 may be provided. This arrangement allows for the use of dampers 34 to connect the voice coil 32 to the external circuit and to ensure vibration balance of sound-generating device 100.

[0089] Each centering support 34 comprises an outer fixing portion 341, a spring-loaded wall portion, and an inner fixing portion 342, which are connected in sequence. The outer fixing portion 341 is connected to the housing 40, while the inner fixing portion 342 is connected to the connecting portion 332. The inner fixing portion 342 is provided with an inner solder pad, along which the leads of the voice coil 32 extend. The outer fixing portion 341, spring-loaded wall portion, and inner fixing portion 342 of the centering support 34 can be integrally molded. This effectively ensures the structural strength of the centering support 34 while simplifying its processing steps.

[0090] In some embodiments, the diaphragm 31 includes an inner ring portion 311, a first fold ring 313 arranged around the inner ring portion 311, a straight portion 314 arranged around the first fold ring 313, a second fold ring 315 arranged around the straight portion 314, and a fixed portion 316 connected to the outside of the second fold ring 315, the fixed portion 316 is connected to the shell 40, the straight portion 314 is connected to the skeleton 33, the inner ring portion 311 is formed with an inner ring hole 312, and the inner ring portion 311 is connected to the third magnetic group 223.

[0091] In this embodiment, the inner ring portion 311 , the first fold ring 313 , the straight portion 314 , the second fold ring 315 and the fixing portion 316 are an integrally formed structure, thereby ensuring the vibration performance and structural strength of the diaphragm 31 .

[0092] The first fold 313 and the second fold 315 of the diaphragm 31 are either convex structures that bulge upward or concave structures that sag downward, without limitation. Optionally, the convex direction of the first fold 313 is opposite to the convex direction of the second fold 315. In this embodiment, the first fold 313 bulges away from the magnetic yoke 21, and the second fold 315 bulges toward the magnetic yoke 21; thus, the second fold 315 of both sound-emitting units bulge toward the magnetic yoke 21, making the airflow in the front cavity smoother and improving the sound effect.

[0093] The protruding portion 2234 of the third magnetic group 223 is protruded from the inner ring hole 312 , that is, the inner ring portion 311 of the diaphragm 31 is connected to the edge portion 2233 of the third magnetic group 223 .

[0094] In this embodiment, the diaphragm 31 further includes a reinforcement portion disposed between the straight portion 314 and the frame 33. As will be appreciated, the reinforcement portion effectively strengthens the structural strength of the straight portion 314 of the diaphragm 31, thereby improving the connection stability of the voice coil 32 and preventing the diaphragm 31 from tearing when the voice coil 32 drives the diaphragm 31 to vibrate.

[0095] In this embodiment, the fixing portion 316 is connected to the housing 40, and one end of the fixing portion 316 away from the second fold 315 is bent and extended toward the housing 40 to form a bent portion 317, which is connected to the outer wall of the housing 40. It can be understood that by bending the outer side of the fixing portion 316 downward to form the bent portion 317, the bent portion 317 is connected to the outer wall of the housing 40, thereby increasing the connection area with the housing 40 and improving the connection stability and sealing performance.

[0096] Reference Figure 5 In a second aspect, the present invention further provides an electronic device, comprising a sound-emitting device 100 and a housing 50 according to any one of the above items, wherein the housing 50 is formed with a receiving cavity and a second sound hole 51 connected to the receiving cavity, the sound-emitting device 100 is arranged in the receiving cavity, and the first sound hole 11 is connected to the second sound hole 51.

[0097] Specifically, the housing 50 includes an upper cover and a lower cover that fit together to form a receiving cavity. The upper and lower covers are also provided with grooves that fit together to form a second sound hole 51. The second sound hole 51 is aligned with the first sound hole 11. The inner wall of the housing 50, together with the two sound-emitting units and the frame 10, forms a sound-emitting rear cavity. The housing 50 also has a third sound hole 52 that communicates with the sound-emitting rear cavity.

[0098] Since the electronic device of this embodiment includes the sound-generating device 100 in all the above embodiments, it has at least the beneficial effects of the above sound-generating device 100 , which will not be described in detail here.

[0099] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A sound-generating device, characterized in that: include: a frame, the frame being formed in a hollow frame shape, and a first sound hole being formed on a side wall of the frame; A sound-producing unit includes a vibration system and a magnetic circuit system; the magnetic circuit system includes a magnetic yoke and a central magnetic portion and a side magnetic portion provided on the magnetic yoke, the side magnetic portion being arranged around the central magnetic portion and spaced apart from the central magnetic portion to form a magnetic gap; the central magnetic portion includes a first magnetic group, a second magnetic group, and a third magnetic group stacked along the vibration direction of the vibration system, the first magnetic group being connected to the magnetic yoke; the vibration system includes a diaphragm having an inner annular hole and a voice coil connected to the diaphragm, the voice coil being arranged corresponding to the magnetic gap, and at least a portion of the third magnetic group being protruding from the inner annular hole; Among them, there are two sound-emitting units, and the two sound-emitting units are respectively connected to the opposite sides of the frame, and the diaphragms of the two sound-emitting units are arranged opposite to each other, and the third magnetic groups of the two sound-emitting units are against each other; the frame and the two sound-emitting units together enclose a sound front cavity, and the sound front cavity is connected to the first sound hole.

2. The sound-generating device according to claim 1, wherein: The central magnetic portion forms a Halbach magnetic circuit, and a side of the central magnetic portion facing the voice coil is a magnetic field enhancement side.

3. The sound-generating device according to claim 2, characterized in that: The first magnetic group and the third magnetic group are magnetized along the vibration direction of the vibration system and in opposite directions. The magnetization direction of the second magnetic group is perpendicular to the magnetization directions of the first magnetic group and the third magnetic group. The magnetic pole of the second magnetic group facing the voice coil is the same as the magnetic pole of the first magnetic group facing the second magnetic group. The edge magnet portion includes stacked edge magnets and edge magnetic conductive plates, the edge magnets are connected to the magnetic conductive yoke; the edge magnets are magnetized along the vibration direction of the vibration system, and the magnetization direction of the first magnetic group is opposite to the magnetization direction of the edge magnets of the edge magnet portion; wherein, The magnetization directions of the two third magnetic groups are opposite.

4. The sound-generating device according to claim 3, characterized in that: The first magnetic group includes a first magnet with an integral plate-shaped structure; or the first magnetic group includes a plurality of first magnets, wherein the plurality of first magnets are adjacently arranged and located between the second magnetic group and the magnetic yoke; wherein the plurality of first magnets are magnetized along the vibration direction of the vibration system, and the plurality of first magnets have the same magnetization direction; And / or, the voice coil is in a rectangular ring shape, having a long side and a short side connected end to end; the second magnetic group includes two second magnets and two third magnets, the two second magnets are adjacent and arranged in parallel along the short side, the two third magnets are arranged at both ends of the two second magnets along the long side, the two second magnets are magnetized in opposite directions, and the two third magnets are magnetized in opposite directions; And / or, the third magnetic group includes a central magnet and an edge portion, the edge portion is arranged around the outer circumference of the central magnet, the side of the central magnet facing away from the second magnetic group protrudes, the side of the edge portion facing away from the second magnetic group forms a protrusion, and the protrusion is protruded from the inner ring hole; wherein, the edge portion is a permanent magnet, and its magnetization direction is the same as the magnetization direction of the central magnet; or, the edge portion is a non-magnetic material bracket; or, the edge portion forms a closed integral ring structure; or, the edge portion includes a plurality of adjacent edge portions, and the adjacent edge portions are connected end to end to form a closed ring structure; or, the edge portion is a permanent magnet and is an integrally formed structure with the central magnet.

5. The sound-generating device according to claim 1, characterized in that: A projection of at least part of the second magnetic group along a vibration direction perpendicular to the vibration system coincides with a projection of the voice coil along the vibration direction perpendicular to the vibration system; And / or, the voice coils of the two sound-emitting units are arranged opposite to each other along the vibration direction of the vibration system, and the two voice coils have the same size.

6. The sound-generating device according to claim 1, characterized in that: The sound-emitting unit further includes a shell, the edge magnetic portion includes a stacked edge magnet and an edge magnetic plate, the edge magnet is connected to the magnetic yoke; one side of the shell is connected to the edge magnetic plate, and the other side of the shell is connected to the periphery of the diaphragm, wherein, The shell is an annular plastic bracket, and the shell is combined with the side magnetic conductive plate by injection molding; or the shell is formed by bending and extending the periphery of the side magnetic conductive plate.

7. The sound-generating device according to claim 6, characterized in that: The vibration system further includes a frame, the frame including a main body and a connecting portion connected to a periphery of the main body, the main body being provided between the diaphragm and the voice coil; The vibration system also includes a centering support plate, which includes an external fixing portion, an internal fixing portion, and an elastic arm portion connecting the external fixing portion and the internal fixing portion. The external fixing portion is connected to the shell and / or the edge magnetic portion, and the internal fixing portion is connected to the connecting portion.

8. The sound-generating device according to claim 6, characterized in that: The vibration system also includes a skeleton, which is arranged between the diaphragm and the voice coil; the diaphragm includes an inner ring portion, a first fold ring arranged around the inner ring portion, a straight portion arranged around the first fold ring, a second fold ring arranged around the straight portion, and a fixed portion connected to the outer side of the second fold ring, the fixed portion is connected to the shell, the straight portion is connected to the skeleton, the inner ring portion is formed with the inner ring hole, and the inner ring portion is connected to the third magnetic group.

9. The sound-generating device according to claim 8, characterized in that: The inner ring portion, the first fold ring, the straight portion, the second fold ring and the fixing portion are an integrally formed structure; And / or, the first fold ring protrudes in a direction away from the magnetic yoke, and the second fold ring protrudes in a direction close to the magnetic yoke; And / or, the diaphragm further comprises a reinforcement portion, wherein the reinforcement portion is provided between the straight portion and the frame; And / or, the fixing portion is connected to the shell, and one end of the fixing portion away from the second fold ring is bent and extended toward the shell to form a bent portion, and the bent portion is connected to the outer wall of the shell.

10. An electronic device, characterized in that: The invention comprises the sound-generating device and a shell according to any one of claims 1 to 9, wherein the shell is formed with a receiving cavity and a second sound hole communicating with the receiving cavity, the sound-generating device is arranged in the receiving cavity, and the first sound hole is communicated with the second sound hole.

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