Sound production device and electronic device

Abstract

This invention discloses a sound-generating device and an electronic device. The sound-generating device includes a frame and sound-generating units. Each sound-generating unit includes a vibration system and a magnetic circuit system. The magnetic circuit system includes a magnetic yoke and a central magnetic part and a side magnetic part spaced apart to form a magnetic gap. The central magnetic part includes a first magnetic group, a second magnetic group, and a third magnetic group stacked together. The vibration system includes a diaphragm with an inner ring hole and a voice coil connected to the diaphragm. The voice coil is correspondingly arranged with the magnetic gap, and at least a portion of the third magnetic group protrudes from the inner ring hole. There are two sound-generating units, which are respectively connected to opposite sides of the frame, and the diaphragms of the two sound-generating units are arranged opposite each other. The third magnetic groups of the two sound-generating units abut against each other. The frame and the two sound-generating units together form a sound-generating front cavity, which is connected to a first sound hole. Since the two sound-generating units are also mutually supported by the magnetic circuit system, the reliability drop margin of the sound-generating device can be increased, thereby significantly improving the overall performance of the device.

Description

Technical Field

[0001] This invention belongs to the field of electroacoustic conversion technology, and specifically relates to a sound-generating device and electronic equipment. Background Technology

[0002] In recent years, with the development of electronic devices, the demand for thinner and lighter electronic products has been increasing. Correspondingly, the size requirements for sound-generating devices have also become larger. At the same time, the performance requirements for sound-generating devices in electronic products are also increasing. Therefore, improving performance under the constraint of structural size is a technical problem that urgently needs to be solved.

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

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

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

[0006] A frame, wherein the frame is formed as a hollow frame and the sidewall of the frame is formed with a first acoustic hole;

[0007] A sound-generating unit includes a vibration system and a magnetic circuit system; the magnetic circuit system includes a magnetic yoke and a central magnetic part and a side magnetic part disposed on the magnetic yoke, the side magnetic part is arranged around the central magnetic part and spaced apart from the central magnetic part to form a magnetic gap, the central magnetic part 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 is connected to the magnetic yoke; the vibration system includes a diaphragm with an inner ring hole and a voice coil connected to the diaphragm, the voice coil is disposed corresponding to the magnetic gap, and at least part of the third magnetic group protrudes from the inner ring hole;

[0008] The sound-generating unit comprises two units, which are respectively connected to opposite sides of the frame, and the diaphragms of the two units are arranged opposite each other. The third magnetic groups of the two units abut against each other. The frame and the two units together form a sound-generating front cavity, which is connected to the first sound hole.

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

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

[0011] In one specific embodiment of the present invention, the first magnetic group and the third magnetic group are both magnetized along the vibration direction of the vibration system and the magnetization directions are opposite. 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 poles of the second magnetic group facing the voice coil are the same as the magnetic poles of the first magnetic group facing the second magnetic group.

[0012] The edge magnetic section includes stacked edge magnets and edge magnetic plates, with the edge magnets connected to the magnetic yoke; the edge magnets are magnetized along the vibration direction of the vibration system, and the magnetization direction of the first magnetic assembly is opposite to the magnetization direction of the edge magnets in the edge magnetic section; wherein...

[0013] The two third magnetic groups are magnetized in opposite directions.

[0014] In one specific embodiment of the present invention, the first magnetic assembly includes a first magnet with an integral plate-like structure; or, the first magnetic assembly includes a plurality of first magnets, which are arranged adjacent to each other and located between the second magnetic assembly and the magnetic yoke; wherein, the plurality of first magnets are all magnetized along the vibration direction of the vibration system, and the magnetization directions of the plurality of first magnets are the same.

[0015] And / or, the voice coil is rectangular and has a long side and a short side that are connected end to end; the second magnetic group includes two second magnets and two third magnets, the two second magnets are adjacent and parallel to each other along the direction of the short side, the two third magnets are located at both ends of the two second magnets along the direction of the long side, the magnetization directions of the two second magnets are opposite, and the magnetization directions of the two third magnets are opposite;

[0016] And / or, the third magnetic assembly includes a central magnet and an edge portion, the edge portion surrounding the outer periphery of the central magnet, the side of the central magnet facing away from the second magnetic assembly protruding from the side of the edge portion facing away from the second magnetic assembly and forming a protrusion, the protrusion being provided in the inner annular hole; wherein, the edge portion is a permanent magnet, and its magnetization direction is the same as that of the central magnet; or, the edge portion is a non-magnetic material support; or, the edge portion forms a closed integral annular structure; or, the edge portion includes multiple edges, adjacent edges being connected end to end to form a closed annular structure; or, the edge portion is a permanent magnet and is integrally formed with the central magnet.

[0017] In one specific embodiment of the present invention, at least a portion of the projection of the second magnetic assembly along the vibration direction perpendicular to the vibration system coincides with the projection of the voice coil along the vibration direction perpendicular to the vibration system.

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

[0019] In one specific embodiment of the present invention, the sound-generating unit further includes a housing; the side magnet portion includes stacked side magnets and side magnetic guide plates, the side magnets and the magnetic guide yoke being connected; one side of the housing is connected to the side magnetic guide plate, and the other side of the housing is connected to the periphery of the diaphragm, wherein...

[0020] The housing is an annular plastic bracket, and the housing is injection molded together with the side magnetic plate; or, the housing is formed by bending and extending the periphery of the side magnetic plate.

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

[0022] The vibration system further includes a centering support, which includes an outer fixing part, an inner fixing part, and a spring arm part connecting the outer fixing part and the inner fixing part. The outer fixing part is connected to the housing and / or the side magnet part, and the inner fixing part is connected to the connecting part.

[0023] In one specific embodiment of the present invention, the vibration system further includes a frame disposed between the diaphragm and the voice coil; the diaphragm includes an inner ring portion, a first folded ring disposed around the inner ring portion, a straight portion disposed around the first folded ring, a second folded ring disposed around the straight portion, and a fixing portion connected to the outside of the second folded ring, the fixing portion being connected to the housing, the straight portion being connected to the frame, the inner ring portion forming the inner ring hole, and the inner ring portion being connected to the third magnet assembly.

[0024] In one specific embodiment of the present invention, the inner ring portion, the first folded ring, the straight portion, the second folded ring, and the fixing portion are integrally formed structures;

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

[0026] And / or, the diaphragm further includes a reinforcing portion disposed between the straight portion and the frame;

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

[0028] A second aspect of the present invention also provides an electronic device, including a sound-generating device and a housing as described in any one of the above, wherein the housing forms a receiving cavity and a second sound hole communicating with the receiving cavity, the sound-generating device is disposed in the receiving cavity, and the first sound hole communicates with the second sound hole.

[0029] A second aspect of the present invention also provides an electronic device, including a sound-generating device and a housing as described in any one of the above, wherein the housing forms a receiving cavity and a second sound hole communicating with the receiving cavity, the sound-generating device is disposed in the receiving cavity, and the first sound hole communicates with 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 diaphragms facing each other, the sound waves from both sides are superimposed, doubling the loudness and thus significantly improving the sound effect of the device. Simultaneously, the simple and regular structure of the sound-generating cavity helps to focus and propagate sound, thereby improving the mid-to-high frequency performance of the device. Furthermore, since the two sound-generating units are mutually supported by a magnetic circuit system, the reliability dropout margin of the device is increased, further enhancing the overall performance. Attached Figure Description

[0031] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0032] Figure 1 This is a three-dimensional structural diagram of the sound-generating device in an embodiment of the present invention;

[0033] Figure 2 for Figure 1 Exploded structural diagram;

[0034] Figure 3 for Figure 1 Exploded view of the central sound-generating device;

[0035] Figure 4 for Figure 1 Exploded view of the central magnetic circuit system;

[0036] Figure 5 This is a schematic diagram of the structure of the electronic device in an embodiment of the present invention;

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

[0038] Explanation of reference numerals in the attached figures:

[0039] 100 - Sound-generating device; 10 - Frame; 11 - First sound hole;

[0040] 20 - Magnetic circuit system; 21 - Magnetic yoke; 22 - Central magnetic section; 221 - First magnetic group; 2211 - First magnet; 222 - Second magnetic group; 2221 - Second magnet; 2222 - Third magnet; 223 - Third magnetic group; 2232 - Central magnet; 2233 - Edge section; 2234 - Protrusion; 23 - Side magnetic section; 231 - Side magnet; 232 - Side magnetic plate; 24 - Magnetic gap;

[0041] 30 - Vibration system; 31 - Diaphragm; 311 - Inner ring; 312 - Inner ring hole; 313 - First surround; 314 - Straight part; 315 - Second surround; 316 - Fixing part; 317 - Bending part; 32 - Voice coil; 33 - Frame; 331 - Main body; 332 - Connecting part; 34 - Centering support; 341 - External fixing part; 342 - Internal fixing part; 343 - Spring arm;

[0042] 40 - housing, 50 - outer shell, 51 - second sound hole, 53 - third sound hole. Detailed Implementation

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

[0044] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0045] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0046] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "over," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure is flipped, an element described as "below other elements or features" or "below other elements or features" would subsequently be oriented as "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0047] Reference Figure 1-6 The first aspect of 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 as a hollow frame, 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 part 22 and a side magnetic part 23 disposed on the magnetic yoke 21, the side magnetic part 23 is arranged around the central magnetic part 22 and spaced apart from the central magnetic part 22 to form a magnetic gap 24, the central magnetic part 22 includes a first magnetic group 221 and a second magnetic group 23 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 correspondingly arranged with the magnetic gap 24, and at least part of the third magnetic group 223 protrudes from the inner ring hole 312; wherein, there are two sound generating units, the two sound generating units are respectively connected to opposite sides of the frame 10, and the diaphragms 31 of the two sound generating units are arranged opposite to each other, and the third magnetic groups 223 of the two sound generating units abut against each other; the frame 10 and the two sound generating units together form a sound generating front cavity, and the sound generating front cavity is connected to the first sound hole 11.

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

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

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

[0051] The vibration system 30 includes a rectangular diaphragm 31 and a voice coil 32 connected to the diaphragm 31. An inner ring hole 312 is formed in the center of the diaphragm 31, through which the magnetic circuit system 20 protrudes. At least a portion 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-axis dimension of the sound-generating unit. By utilizing the Z-axis height of the sound-generating unit itself, the Z-axis height of the magnetic circuit system 20 of the sound-generating unit can be increased.

[0052] The magnetic circuit system 20 includes a magnetic yoke 21 and a central magnetic portion 22 and a side magnetic portion 23 disposed on the magnetic yoke 21. Specifically, the magnetic yoke 21 is disposed parallel to the diaphragm 31. The central magnetic portion 22 and the side magnetic portion 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 and forms a magnetic gap with it opposite to the voice coil 32. In this way, the magnetic gap can provide a magnetic field for the voice coil 32 and drive the energized voice coil 32 to vibrate, thereby driving the diaphragm 31 to produce sound.

[0053] The central magnetic section 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 ring hole 312. This allows for adjusting the magnetic field direction of the first magnetic group 221, the second magnetic group 222, and the third magnetic group 223 to increase the magnetic field strength of the central magnetic section 22, thereby improving the B value of the magnetic circuit system 20, increasing the BL value of the sound-generating unit, and improving the sensitivity of the sound-generating unit.

[0054] Two sound-generating units are connected to opposite sides of the frame 10 via a vibration system 30. The two third magnetic groups 223 protruding from the inner ring hole 312 of each unit are positioned abutting against each other, effectively mirroring each other. The two sound-generating units and the sidewall of the frame 10 together form a sound-generating front cavity, which communicates with the first sound hole 11. Understandably, since the two sound-generating units are connected to the frame 10 via diaphragms 31, the sound waves from both sides are superimposed, doubling the loudness and significantly improving the sound effect of the sound-generating device 100. Simultaneously, the simple and regular structure of the sound-generating front cavity facilitates sound focusing and propagation, thereby improving the mid-to-high frequency performance of the sound-generating device 100. Furthermore, since the two sound-generating units are also supported by a magnetic circuit system 20, the reliability drop margin of the sound-generating device 100 is increased, significantly enhancing the overall performance.

[0055] In some embodiments, the central magnetic section 22 forms a Heilbeck magnetic circuit, with the side of the central magnetic section 22 facing the voice coil 32 being the magnetic field enhancement side. The central magnetic section 22 forms a Heilbeck magnetic array, capable of generating a strong magnetic field. The magnetic field generated by the Heilbeck magnetic array drives the voice coil 32, causing the diaphragm 31 to vibrate and produce sound. This results in a strong magnetic field at the voice coil 32, increasing the magnetic flux density of the magnetic gap 24, increasing the number of magnetic lines of force passing through the voice coil 32, and increasing the magnetic force on the voice coil 32, effectively improving the BL value and enhancing the sensitivity of the driver. Furthermore, the Heilbeck magnetic array allows for a uniform distribution of magnetic lines of force at the voice coil 32 and good linearity in the magnetic field change along the vibration direction of the diaphragm 31, effectively improving the flatness of the BL curve, significantly improving the FR frequency response curve, and effectively reducing harmonic distortion (THD). This effectively improves the sound quality of the audio output by the driver, enhances the treble effect, and to some extent alleviates the distortion of the audio output by the driver, resulting in a better overall sound effect and performance.

[0056] Of course, in other embodiments, the central magnetic part 22 may also adopt other structures. For example, the central magnetic part may include a first magnetic group, a central magnetic plate and a third magnetic group stacked together. The first magnetic group and the third magnetic group are magnetized along the vibration direction of the vibration system 30 and are arranged in opposite directions of the magnetic field.

[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 in opposite directions. 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 poles on the side of the second magnetic group 222 facing the voice coil 32 are the same as the magnetic poles on the side of the first magnetic group 221 facing the second magnetic group 222. The side magnetic part 23 includes a side magnet 231 and a side magnetic guide plate 232 stacked together. The side magnet 231 is connected to the magnetic yoke 21. The side 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 side magnet 231 of the side magnetic part 23. The magnetization directions of the two third magnetic groups 223 are opposite.

[0058] Understandably, the magnetization direction of the first magnetic group 221 is opposite to that of the third magnetic group 223. This causes the magnetic field lines of the first magnetic group 221 and the third magnetic group 223 in the central magnetic part 22 to converge at the second magnetic group 222. The central magnetic part 22 generates a magnetic field with a stronger magnetic field strength that passes through the magnetic gap 24, thereby increasing the magnetic flux density of the magnetic gap 24, increasing the number of magnetic field lines passing through the voice coil 32, increasing the magnetic force on the voice coil 32, and effectively improving the BL value. At the same time, the magnetization directions of the two third magnetic groups 223 are opposite, and the magnetization directions of the two side magnets 231 are opposite, which is more conducive to the concentrated distribution of magnetic field lines, reducing magnetic leakage and improving FR performance.

[0059] This embodiment defines the magnetization direction of each magnetic group in the central magnetic section 22 and the side magnets 231 in the side magnetic section 23, thus forming a Heilbeck magnetic circuit. This strengthens the magnetic field on the side of the central magnetic section 22 facing the voice coil 32, thereby increasing the magnetic flux density of the magnetic gap 24, increasing the number of magnetic lines of force passing through the voice coil 32, increasing the magnetic force on the voice coil 32, effectively improving the BL value, increasing the sensitivity of the driver, effectively improving the flatness of the BL curve, significantly improving the FR frequency response curve, and effectively reducing harmonic distortion (THD), resulting in a better overall sound effect and performance. Simultaneously, by setting the magnetization direction of the two third magnetic groups 223 in the two drivers to opposite directions, the magnetic lines of force of the two third magnetic groups 233 repel each other, further enabling more magnetic lines of force in their respective magnetic circuit systems 20 to form closed magnetic loops, increasing the magnetic field strength.

[0060] In some embodiments, the first magnetic assembly 221 includes a first magnet 2211 with an integral plate-like structure. This arrangement facilitates the processing of the first magnet 2211, as well as its assembly and magnetization, effectively improving production and assembly efficiency.

[0061] In some embodiments, the first magnetic group 221 includes a plurality of 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 plurality of first magnets 2211 are all magnetized along the vibration direction of the vibration system 30, and the magnetization direction of the plurality of first magnets 2211 is the same.

[0062] The first magnetic assembly 221 includes a plurality of first magnets 2211, which are laid flat between the magnetic yoke 21 and the second magnetic assembly 222. All the first magnets 2211 are magnetized vertically, and the magnetization directions of the multiple first magnets 2211 are the same; that is, the multiple first magnets 2211 are simultaneously magnetized upwards or downwards along the direction of movement of the voice coil 32, without limitation.

[0063] The voice coil 32 is rectangular and has a long side and a short side that are connected end to end. Optionally, a plurality of first magnets 2211 are arranged adjacent to each other and in parallel along the direction of the long side; or, a plurality of first magnets 2211 are arranged adjacent to each other and in parallel along the direction of the short side; or, a portion of the first magnets 2211 are arranged adjacent to each other and in parallel along the direction of the long side, and another portion of the first magnets 2211 are located at both ends of a portion of the first magnets 22112 along the direction of the short side, and vice versa. No limitation is made here.

[0064] In some embodiments, the second magnetic group 222 is magnetized along a direction perpendicular to the vibration direction of 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 vertical, and the vibration direction perpendicular to the vibration system 30 can be selected as horizontal. 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 toward the center of the second magnetic group 222, that is, the S pole of the second magnetic group 222 faces the voice coil 32, and the N pole is located at the center of the second magnetic group 222; or, the magnetization direction of the second magnetic group 222 can be from the center of the second magnetic group 222 toward the voice coil 32, that is, the S pole of the second magnetic group 222 is located at the center of the second magnetic group 222, and the N pole faces the voice coil 32; or, 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 towards its periphery, the first magnetic group 221 of the central magnetic part 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 its periphery towards its center, the first magnetic group 221 of the central magnetic part 22 is magnetized from top to bottom, and the third magnetic group 223 is magnetized from bottom to top; this is not limited to either direction.

[0067] In some embodiments, the second magnetic group 222 is magnetized along the vibration direction perpendicular to the vibration direction of 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 poles of the inner side of the second magnetic group 222 near its center are the same as the magnetic poles 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 parallel along the direction of their short sides, and the two third magnets 2222 are located at both ends of the two second magnets 2221 along the direction of their long sides. Both the two second magnets 2221 and the two third magnets 2222 are magnetized along the direction of their short sides and the direction of their long sides, 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 all magnetized in the horizontal direction. The magnetization directions of the two second magnets 2221 are opposite, and the magnetization directions of the two third magnets 2222 are opposite. 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 is either N pole or S pole, which is not limited here.

[0070] In some embodiments, the third magnetic assembly 223 includes a central magnet 2232 and an edge portion 2233. The edge portion 2233 surrounds the outer periphery of the central magnet 2232. The side of the central magnet 2232 facing away from the second magnetic assembly 222 protrudes from the side of the edge portion 2233 facing away from the second magnetic assembly 222, forming a protrusion 2234. The protrusion 2234 protrudes into the inner annular hole 312. In this way, the Z-axis height of the magnetic circuit system 20 can be increased by utilizing the Z-axis height of the sound-generating unit itself, thereby further reducing the Z-axis dimension of the sound-generating unit while maintaining the performance of the sound-generating unit, and further reducing the Z-axis dimension of the sound-generating device 100.

[0071] Optionally, the edge portion 2233 is a permanent magnet, and its magnetization direction is the same as that of the central magnet 2232; or, the edge portion 2233 is a non-magnetic material support. The plane of the edge portion 2233 facing away from the second magnetic group 222 is adapted to connect with the outer periphery of the inner annular hole 312 of the diaphragm 31 to form an inner support structure of the diaphragm 31. It can be a non-magnetic material support or a permanent magnet, which is not limited here.

[0072] Further optionally, the edge portion 2233 forms a closed integral ring structure; or, the edge portion 2233 includes multiple edges, with adjacent edge portions 2233 connected end to end to form a closed ring structure; or, the edge portion 2233 includes multiple edges, with adjacent edge portions 2233 spaced apart to form a ring structure with gaps; or, the edge portion 2233 and the central magnet 2232 are integrally formed.

[0073] The thickness of the center magnet 2232 along the moving direction of the voice coil 32 may optionally be greater than the thickness of the edge portion 2233 along the moving direction of the voice coil 32. That is, the side surface of the center magnet 2232 facing away from the second magnetic group 222 protrudes from the side surface of the edge portion 2233 facing away from the second magnetic group 222 to form a protrusion 2234.

[0074] In some embodiments, the magnetization direction of the first magnetic group 221 is opposite to that 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 on top and the S pole is on the bottom, the N pole of the third magnetic group 223 is on the bottom and the S pole is on top. Alternatively, 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 on the bottom and the S pole is on top, the N pole of the third magnetic group 223 is on top and the S pole is on the bottom. This is not limited here.

[0075] In some embodiments, the side magnet section 23 includes a side magnet 231 and a side magnetic plate 232 stacked together, and the side magnet 231 is connected to the magnetic yoke 21; the first magnetic group 221, the third magnetic group 223 and the side 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 side magnet 231 of the side magnet section 23, and the magnetization direction of the third magnetic group 223 is the same as the magnetization direction of the side magnet 231 of the side magnet section 23.

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

[0077] There are multiple side magnets 231 and multiple side magnetic plates 232, arranged in a one-to-one correspondence. Adjacent side magnets 231 are connected end-to-end to form a closed ring structure. Alternatively, there are multiple side magnets 231 and multiple side magnetic plates 232, arranged in a one-to-one correspondence. Adjacent side magnets 231 are spaced apart to form a ring structure with gaps, or the side magnets 231 form a closed, integral ring structure. There are multiple side magnetic plates 232, and it is not limited to whether adjacent side magnetic plates 232 are spaced apart to form a ring structure with gaps, or adjacent side magnetic plates 232 are connected end-to-end to form a closed ring structure.

[0078] The side magnets 231 of the side magnet section 23 and the first magnetic group 221 and the third magnetic group 223 of the center magnet section 22 are all magnetized in the vertical direction, that is, in the direction of movement 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 section 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 section 23.

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

[0080] Understandably, this arrangement causes the magnetic field lines of the first magnetic group 221 and the third magnetic group 223 of the central magnetic section 22 to converge at the second magnetic group 222 and pass through the magnetic gap, thereby increasing the magnetic flux density of the magnetic gap. This places the voice coil 32 in a more reasonable magnetic field, alleviating the 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 projection of the second magnetic group 222 along the horizontal direction is located in the projection of the voice coil 32 along the horizontal direction.

[0081] In some embodiments, the voice coils 32 of the two sound-generating units are arranged opposite each other along the vibration direction of the vibration system 30, and the two voice coils 32 are of the same size. It should be noted that both voice coils 32 are annular, and the thickness and height of the two voice coils 32 are consistent, that is, they are mirror images of each other. This helps to improve the overall loudness of the sound-generating device.

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

[0083] Specifically, the sound-generating unit also includes a housing 40, which can be a square frame or a frame 10 structure. That is, the housing 40 has a cavity with openings at both ends. The magnetic circuit system 20 is connected to one end of the housing 40, and the vibration system 30 is connected to the other end of the housing 40, so that the magnetic circuit system 20, the housing 40 and the diaphragm 31 of the vibration system 30 enclose and form 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; or, the magnetic circuit system 20 can be connected to the housing 40 via the side magnetic plate 232 of the side magnetic part 23. The diaphragm 31 of the vibration system 30 is connected to the end of the housing 40 away from the magnetic yoke 21, and is opposite to 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 correspondingly disposed with respect to the magnetic gap 24.

[0085] Meanwhile, in this embodiment, the housing 40 is made into an annular plastic support, and the housing is injection molded together with the side magnetic plate 232; or, the housing 40 is formed by bending and extending the periphery of the side magnetic plate 232. This helps to improve the connection strength between the housing 40 and the magnetic circuit system 20, thereby improving the reliability of the sound-generating unit.

[0086] In some embodiments, the vibration system 30 further includes a frame 33, which includes a main body 331 and a connecting part 332 connected to the periphery of the main body 331. The main body 331 is disposed between the diaphragm 31 and the voice coil 32. The vibration system 30 also includes a centering support 34, which includes an outer fixing part 341, an inner fixing part 342, and a spring arm part 343 connecting the outer fixing part 341 and the inner fixing part 342. The outer fixing part 341 is connected to the housing 40 and / or the side magnet part 23, and the inner fixing part 342 is connected to the connecting part 332.

[0087] In this embodiment, the main body 331 of the skeleton 33 can be selected as a ring structure, that is, the main body 331 is arranged in a ring and surrounds the central magnetic part 22. Optionally, the main body 331 is arranged in a rectangular ring shape, and the connecting parts 332 include multiple parts, with the multiple connecting parts 332 respectively located at the four corners of the main body 331.

[0088] Understandably, by setting the centering support 34, the voice coil 32's leads can be connected to the external circuit for conduction, and the centering support 34 can also prevent the voice coil 32 from swaying or polarizing during vibration. Multiple centering supports 34 are included, and these supports 34 are distributed along the major axis and / or minor axis and / or diagonally or at the four corners of the magnetic circuit system 20. Optionally, two or four centering supports 34 are included. This arrangement allows the voice coil 32 to be connected to the external circuit for conduction while ensuring the vibration balance of the sound-generating device 100.

[0089] Each centering support 34 includes an outer fixing part 341, a spring wall part, and an inner fixing part 342 connected in sequence. The outer fixing part 341 is connected to the housing 40, and the inner fixing part 342 is connected to the connecting part 332. The inner fixing part 342 is provided with an inner solder pad, and the lead wire of the voice coil 32 extends along the connecting part 332 to the inner solder pad. The outer fixing part 341, the spring wall part, and the inner fixing part 342 of the centering support 34 can be selected as an integrally formed structure. This can effectively ensure the structural strength of the centering support 34, while simplifying the processing steps of the centering support 34.

[0090] In some embodiments, the diaphragm 31 includes an inner ring portion 311, a first folded ring 313 surrounding the inner ring portion 311, a straight portion 314 surrounding the first folded ring 313, a second folded ring 315 surrounding the straight portion 314, and a fixing portion 316 connected to the outside of the second folded ring 315. The fixing portion 316 is connected to the housing 40, the straight portion 314 is connected to the frame 33, the inner ring portion 311 has an inner ring hole 312, and the inner ring portion 311 is connected to the third magnetic assembly 223.

[0091] In this embodiment, the inner ring 311, the first folded ring 313, the straight part 314, the second folded ring 315, and the fixing part 316 are integrally formed structures, 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 have an upwardly convex structure or a downwardly concave structure, which is not limited here. 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 convexes away from the magnetic yoke 21, and the second fold 315 convexes towards the magnetic yoke 21; thus, the second fold 315 of both sound-producing units convex towards the magnetic yoke 21, making the airflow in the front cavity smoother and improving the sound production effect.

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

[0094] In this embodiment, the diaphragm 31 further includes a reinforcing portion disposed between the flat portion 314 and the frame 33. It is understood that by providing the reinforcing portion, the structural strength of the flat portion 314 of the diaphragm 31 can be effectively enhanced, thereby improving the connection stability of the voice coil 32 and preventing problems such as tearing of the diaphragm 31 when the voice coil 32 drives the diaphragm 31 to vibrate.

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

[0096] Reference Figure 5 The second aspect of the present invention also provides an electronic device, including a sound-generating device 100 and a housing 50 as described above, wherein the housing 50 forms a receiving cavity and a second sound hole 51 communicating with the receiving cavity, the sound-generating device 100 is disposed in the receiving cavity, and the first sound hole 11 communicates with the second sound hole 51.

[0097] Specifically, the housing 50 includes an upper cover and a lower cover that are adapted to form a receiving cavity. The upper cover and the lower cover are also provided with grooves adapted to enclose and form a second sound hole 51, and the formed second sound hole 51 is aligned with the position of the first sound hole 11. The inner wall of the housing 50 is also enclosed with the two sound-emitting units and the frame 10 to form a sound-emitting rear cavity. At the same time, the housing 50 is also provided with 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 sound-generating device 100, which will not be repeated here.

[0099] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions 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 producing device, characterized by, include: A frame, wherein the frame is formed as a hollow frame and the sidewall of the frame is formed with a first acoustic hole; A sound-generating unit includes a vibration system and a magnetic circuit system; the magnetic circuit system includes a magnetic yoke and a central magnetic part and a side magnetic part disposed on the magnetic yoke, the side magnetic part is arranged around the central magnetic part and spaced apart from the central magnetic part to form a magnetic gap, the central magnetic part 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 is connected to the magnetic yoke; the vibration system includes a diaphragm with an inner ring hole and a voice coil connected to the diaphragm, the voice coil is disposed corresponding to the magnetic gap, and at least part of the third magnetic group protrudes from the inner ring hole; The sound-generating unit comprises two units, which are respectively connected to opposite sides of the frame, and the diaphragms of the two units are arranged opposite each other. The third magnetic groups of the two units abut against each other. The frame and the two units together form a sound-generating front cavity, which is connected to the first sound hole.

2. The sound production device of claim 1, wherein, The central magnetic section forms a Heilbeck magnetic circuit, and the side of the central magnetic section facing the voice coil is the magnetic field enhancement side.

3. The sound production device of claim 2, wherein, The first magnetic group and the third magnetic group are both magnetized along the vibration direction of the vibration system and the magnetization directions are opposite. 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 poles on the side of the second magnetic group facing the voice coil are the same as the magnetic poles on the side of the first magnetic group facing the second magnetic group. The edge magnetic section includes stacked edge magnets and edge magnetic plates, with the edge magnets connected to the magnetic yoke; the edge magnets are magnetized along the vibration direction of the vibration system, and the magnetization direction of the first magnetic assembly is opposite to the magnetization direction of the edge magnets in the edge magnetic section; wherein... The two third magnetic groups are magnetized in opposite directions.

4. The sound-generating device according to claim 3, characterized in that, The first magnetic assembly includes a first magnet with an integral plate-like structure; or, the first magnetic assembly includes a plurality of first magnets, which are arranged adjacent to each other and located between the second magnetic assembly and the magnetic yoke; wherein, the plurality of first magnets are all magnetized along the vibration direction of the vibration system, and the magnetization direction of the plurality of first magnets is the same. And / or, the voice coil is rectangular and has a long side and a short side that are connected end to end; the second magnetic group includes two second magnets and two third magnets, the two second magnets are adjacent and parallel to each other along the direction of the short side, the two third magnets are located at both ends of the two second magnets along the direction of the long side, the magnetization directions of the two second magnets are opposite, and the magnetization directions of the two third magnets are opposite; And / or, the third magnetic assembly includes a central magnet and an edge portion, the edge portion surrounding the outer periphery of the central magnet, the side of the central magnet facing away from the second magnetic assembly protruding from the side of the edge portion facing away from the second magnetic assembly and forming a protrusion, the protrusion being provided in the inner annular hole; wherein, the edge portion is a permanent magnet, and its magnetization direction is the same as that of the central magnet; or, the edge portion is a non-magnetic material support; or, the edge portion forms a closed integral annular structure; or, the edge portion includes multiple edges, adjacent edges being connected end to end to form a closed annular structure; or, the edge portion is a permanent magnet and is integrally formed with the central magnet.

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

6. The sound-generating device according to claim 1, characterized in that, The sound-generating unit further includes a housing; the side magnet portion includes stacked side magnets and side magnetic guide plates, the side magnets and the magnetic guide yoke being connected; one side of the housing is connected to the side magnetic guide plate, and the other side of the housing is connected to the periphery of the diaphragm, wherein... The housing is an annular plastic bracket, and the housing is injection molded together with the side magnetic plate; or, the housing is formed by bending and extending the periphery of the side magnetic plate.

7. The sound-generating device according to claim 6, characterized in that, The vibration system also includes a frame, which includes a main body and a connecting part connected to the periphery of the main body, wherein the main body is disposed between the diaphragm and the voice coil; The vibration system further includes a centering support, which includes an outer fixing part, an inner fixing part, and a spring arm part connecting the outer fixing part and the inner fixing part. The outer fixing part is connected to the housing and / or the side magnet part, and the inner fixing part is connected to the connecting part.

8. The sound-generating device according to claim 6, characterized in that, The vibration system further includes a frame disposed between the diaphragm and the voice coil; the diaphragm includes an inner ring portion, a first folded ring surrounding the inner ring portion, a straight portion surrounding the first folded ring, a second folded ring surrounding the straight portion, and a fixing portion connected to the outside of the second folded ring, the fixing portion being connected to the housing, the straight portion being connected to the frame, the inner ring portion forming the inner ring hole, and the inner ring portion being connected to the third magnet assembly.

9. The sound-generating device according to claim 8, characterized in that, The inner ring, the first folded ring, the straight part, the second folded ring, and the fixing part are integrally formed. And / or, the first folded ring protrudes in a direction away from the magnetic yoke, and the second folded ring protrudes in a direction close to the magnetic yoke; And / or, the diaphragm further includes a reinforcing portion disposed between the straight portion and the frame; And / or, the fixing part is connected to the housing, and one end of the fixing part away from the second folding ring is bent and extended toward the housing to form a bent part, and the bent part is connected to the outer wall of the housing.

10. An electronic device, characterized in that, The invention includes a sound-generating device and a housing as described in any one of claims 1-9, wherein the housing forms a receiving cavity and a second sound hole communicating with the receiving cavity, the sound-generating device is disposed within the receiving cavity, and the first sound hole communicates with the second sound hole.

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