Acoustic device and electronic apparatus

Abstract

The invention belongs to the technical field of electro-acoustic conversion, and particularly relates to an acoustic device and electronic equipment, the acoustic device comprises a magnetic circuit system and a vibration system, and the magnetic circuit system is provided with two magnetic gaps arranged side by side along a first direction; the vibration system comprises a vibrating diaphragm assembly and two voice coils, the vibrating diaphragm assembly and the magnetic circuit system are oppositely arranged, the two voice coils are arranged side by side in the first direction, one ends of the two voice coils are connected to the vibrating diaphragm assembly, the other ends of the two voice coils are located in the two magnetic gaps respectively, and each voice coil is provided with a long edge in the length direction and a short edge in the width direction; the extension direction of the short edge is parallel to the first direction; wherein the current direction of one voice coil is clockwise, and the current direction of the other voice coil is anticlockwise. The acoustic device has relatively low electromagnetic radiation, so that electromagnetic radiation interference on the whole electronic equipment is reduced, and the performance of the whole electronic equipment is further improved.

Description

Technical Field

[0001] The invention belongs to the technical field of electroacoustic conversion, and specifically relates to an acoustic device and an electronic device. Background Art

[0002] In order to adapt to the trend of thinner and lighter smart devices, acoustic devices also need to be thinner and lighter. In order to ensure the acoustic performance of thin acoustic devices, the relevant technology provides an acoustic device with dual voice coils and five magnets. Although the acoustic device can ensure its acoustic performance while reducing the thickness, the electromagnetic effect generated by the dual voice coils during normal operation will interfere with other parts of the whole machine due to the same current direction of the dual voice coils, thereby affecting the overall performance of the whole machine. Therefore, how to reduce the electromagnetic interference of acoustic devices has become a technical problem that needs to be solved urgently.

[0003] In view of the above shortcomings, the present invention is proposed. Summary of the invention

[0004] The object of the present invention is to provide an acoustic device and an electronic device, so as to at least partially reduce the electromagnetic interference problem of the acoustic device on the electronic device.

[0005] A first aspect of the present invention provides an acoustic device, comprising:

[0006] A magnetic circuit system having two magnetic gaps arranged side by side in a first direction;

[0007] A vibration system, comprising a diaphragm assembly and two voice coils, wherein the diaphragm assembly is arranged opposite to the magnetic circuit system, the two voice coils are arranged side by side along the first direction, one end of the two voice coils is connected to the diaphragm assembly, and the other end is respectively located in two magnetic gaps, and each of the voice coils has a long side along the length direction and a short side along the width direction, and the extension direction of the short side is parallel to the first direction; wherein,

[0008] The current direction of one voice coil is clockwise, and the current direction of the other voice coil is counterclockwise.

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

[0010] In a specific embodiment of the present invention, the magnetic circuit system includes a magnetic yoke and a common magnetic part, a central magnetic part and a side magnetic part arranged on the magnetic yoke, the common magnetic part is arranged along the long axis direction, the central magnetic part includes two and is arranged on both sides of the common magnetic part, the side magnetic part includes two and is arranged on both sides of the two central magnetic parts, and the magnetic gap is formed between the common magnetic part and the central magnetic part and the side magnetic part located on the same side thereof; wherein,

[0011] The side magnetic portion and the center magnetic portion are magnetized vertically and the magnetization directions of the side magnetic portion and the center magnetic portion that form the same magnetic gap are opposite, the common magnetic portion is magnetized horizontally, and the magnetic poles on both sides of the common magnetic portion are the same as the magnetic poles of the center magnetic portion on the corresponding side facing the magnetic yoke.

[0012] In a specific embodiment of the present invention, the common magnetic part includes a common magnet, the common magnet is horizontally magnetized, and the magnetic poles on both sides of the common magnet are the same as the magnetic poles of the central magnetic part on the corresponding side facing the magnetic yoke.

[0013] In a specific embodiment of the present invention, the common magnetic part includes two common magnets arranged side by side along the short axis direction, both common magnets are horizontally magnetized and have the same magnetization direction, and the magnetic pole of each common magnet corresponding to one end of the central magnetic part is the same as the magnetic pole of the central magnetic part facing the magnetic yoke.

[0014] In a specific implementation manner of the present invention, the two common magnets are arranged at an interval, and the distance between the two common magnets is ≥0.5 mm.

[0015] In a specific embodiment of the present invention, a surface of the common magnetic portion close to the diaphragm assembly is not lower than a surface of the central magnetic portion close to the diaphragm assembly.

[0016] In a specific embodiment of the present invention, the thickness of the common magnetic portion is not less than the thickness of the central magnetic portion;

[0017] Alternatively, the magnetically conductive yoke is provided with a protrusion facing the common magnetic portion, the common magnetic portion is provided on the protrusion, and the thickness of the common magnetic portion is at least half of the thickness of the central magnetic portion;

[0018] and / or, the thickness of the edge magnetic portion is not greater than the thickness of the central magnetic portion;

[0019] And / or, the magnetic yoke is provided with an avoidance groove corresponding to the magnetic gap.

[0020] In a specific embodiment of the present invention, the central magnetic portion includes a stacked central magnet and a central magnetic conductive plate, and the side magnetic portion includes stacked side magnets and side magnetic conductive plates, the side magnets and the central magnet are vertically magnetized, and the magnetization directions of the side magnets and the central magnet that form the same magnetic gap are opposite.

[0021] In a specific embodiment of the present invention, it further comprises a shell, wherein the shell has a first side and a second side which are arranged opposite to each other, wherein the first side is connected to the diaphragm assembly, and the second side is connected to the magnetic circuit system.

[0022] In a specific embodiment of the present invention, the diaphragm assembly includes an annular diaphragm and a vibration plate, the diaphragm includes an outer fixing portion, a folding ring portion and an inner fixing portion from the outside to the inside, the outer fixing portion is connected to the housing, and the inner fixing portion is connected to the vibration plate;

[0023] An annular protrusion facing the magnetic circuit system is formed on the vibration plate, and the voice coil is connected to the annular protrusion.

[0024] A second aspect of the present invention further provides an electronic device, comprising any one of the acoustic devices described above.

[0025] The acoustic device of the present invention is provided with a magnetic circuit system having a magnetic gap and a vibration system in which a voice coil is inserted in the magnetic gap, so that the voice coil can drive the diaphragm assembly to vibrate and make sound when powered on, thereby enabling the acoustic device to have a sound-generating function. At the same time, by providing two magnetic gaps and two corresponding voice coils, the effective length of the magnetic circuit system for driving the voice coil to vibrate can be increased, that is, the driving force coefficient (BL) of the sound-generating device can be increased, thereby improving the sound quality effect of the acoustic device, and the above-mentioned improvement can offset the impact on the performance of the acoustic device when the thickness of the acoustic device is reduced, thereby ensuring the sound quality effect of the thin and light electronic device. In addition, since the current directions of the two voice coils are opposite, the inductances generated when the power is on and vibrated can offset each other, thereby reducing the electromagnetic radiation of the acoustic device and reducing the electromagnetic radiation interference to the entire electronic device. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 is a three-dimensional structural diagram of an acoustic device in an embodiment of the present invention;

[0028] Figure 2 for Figure 1 The main view;

[0029] Figure 3 In one embodiment Figure 2 Sectional view of AA in the middle;

[0030] Figure 4 for Figure 3 Simulation diagram of magnetic flux density in the medium magnetic circuit system;

[0031] Figure 5 for Figure 3 An exploded view of the structure of the mesoacoustic device;

[0032] Figure 6 In another embodiment Figure 2 Sectional view of AA in the middle;

[0033] Figure 7 for Figure 6 Simulation diagram of magnetic flux density in the medium magnetic circuit system;

[0034] Figure 8 FIG. 4 is a three-dimensional structural diagram of the acoustic device in an embodiment of the present invention from another perspective.

[0035] Description of reference numerals:

[0036] 100-Acoustic device;

[0037] 10- housing;

[0038] 20-magnetic circuit system, 21-magnetic yoke, 211-avoidance groove; 22-common magnet, 23-central magnetic part, 231-central magnet, 232-central magnetic plate, 24-side magnetic part, 241-side magnet, 242-side magnetic plate;

[0039] 30-vibration system, 31-diaphragm assembly, 311-diaphragm, 312-vibration plate; 32-voice coil, 321-first voice coil, 322-second voice coil, 33-centering support plate, 331-first centering support plate, 332-second centering support plate, 333-spot welding pad. DETAILED DESCRIPTION

[0040] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the 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. On the contrary, these embodiments are provided in order 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.

[0041] It should be understood that the terms used in the text are only for the purpose of describing specific example embodiments, and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used in the text may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence 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 interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0042] 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, 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.

[0043] For ease of description, spatial 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 figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure is turned over, then the elements described as "below other elements or features" or "below other elements or features" will 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 can be oriented otherwise (rotated 90 degrees or in other directions) and the spatial relative descriptors used in the text are interpreted accordingly.

[0044] The embodiment of the present invention provides an acoustic device 100, which can be used in electronic equipment and enable the electronic equipment to have a sound-generating function. At the same time, the acoustic device 100 of the embodiment of the present invention has a weaker electromagnetic effect, thereby further reducing electromagnetic radiation interference to the entire electronic equipment.

[0045] Reference Figures 1 to 8 The acoustic device 100 provided in the first aspect of an embodiment of the present invention includes a magnetic circuit system 20 and a vibration system 30, wherein the magnetic circuit system 20 has two magnetic gaps arranged side by side along a first direction; the vibration system 30 includes a diaphragm assembly 31 and two voice coils 32, the diaphragm assembly 31 is suspended above the magnetic circuit system 20, the two voice coils 32 are arranged side by side along the first direction, and one end of the two voice coils 32 is connected to the diaphragm assembly 31, and the other end is respectively located in the two magnetic gaps, each voice coil 32 has a long side along the length direction and a short side along the width direction, and the extension direction of the short side is parallel to the first direction; the current direction of one of the voice coils 32 is clockwise, and the current direction of the other voice coil 32 is counterclockwise.

[0046] Specifically, the acoustic device 100 is formed as a whole into a roughly rectangular shape, and correspondingly, its magnetic circuit system 20 and vibration system 30 are also roughly rectangular. The voice coil 32 has a long side and a short side, the length direction of which is the long side, and the width direction is the short side. The extension direction of the short side is parallel to the first direction, that is, the voice coil 32 is arranged along the extension direction of the short side, that is, both magnetic gaps extend along the length direction, that is, the length direction of the magnetic gap is parallel to the long side direction of the voice coil.

[0047] The diaphragm assembly 31 in the vibration system 30 is arranged coaxially with the magnetic circuit system 20, and the two voice coils 32 are arranged side by side along the first direction, and one end of the two voice coils 32 is connected to the diaphragm assembly 31, and the other end is inserted into the two magnetic gaps respectively. Since there is a magnetic field in the magnetic gap, when the voice coil 32 is energized, it will be affected by the magnetic field and can vibrate in the magnetic gap, thereby driving the diaphragm assembly 31 to vibrate and produce sound.

[0048] Since there are two magnetic gaps and two voice coils 32 in this embodiment, and the length direction of the magnetic gap is parallel to the long side direction of the voice coil 32, compared with the single voice coil 32 structure, this embodiment can increase the length of the voice coil 32 in the magnetic gap, increase the effective length of the magnetic circuit system 20 for driving the voice coil 32 to vibrate, that is, increase the driving force coefficient (BL) of the acoustic device 100, thereby improving the sound quality of the acoustic device 100. Correspondingly, when the thickness of the acoustic device 100 is reduced, the improvement brought by the provision of two magnetic gaps and voice coils 32 can also offset the effect of the reduced thickness on the performance of the acoustic device 100, thereby ensuring the sound quality of the thin electronic device.

[0049] In addition, since the current directions of the two voice coils 32 in this embodiment are clockwise and counterclockwise, that is, the current directions of the two voice coils 32 are opposite, the inductances generated when the two voice coils 32 are energized and vibrate can cancel each other out, thereby having smaller electromagnetic radiation. Compared with the solution in which the current directions of the two voice coils 32 are the same, this embodiment can reduce the electromagnetic radiation of the acoustic device 100 and reduce the electromagnetic radiation interference to the entire electronic device.

[0050] The acoustic device 100 of the embodiment of the present invention is provided with a magnetic circuit system 20 having a magnetic gap and a vibration system 30 in which a voice coil 32 is inserted in the magnetic gap, so that the voice coil 32 can drive the diaphragm assembly 31 to vibrate and make sound when powered on, thereby enabling the acoustic device 100 to have a sound-generating function. At the same time, by providing two magnetic gaps and corresponding two voice coils 32, the effective length of the magnetic circuit system 20 for driving the voice coil 32 to vibrate can be increased, that is, the driving force coefficient (BL) of the acoustic device 100 is increased, thereby improving the sound quality effect of the acoustic device 100, and the above-mentioned improvement can offset the impact on the performance of the acoustic device 100 when the thickness of the acoustic device 100 is reduced, thereby ensuring the sound quality effect of the thin and light electronic device. In addition, since the current directions of the two voice coils 32 are opposite, the inductances generated when the power is turned on and vibrated can offset each other, thereby having a smaller electromagnetic radiation, thereby reducing the electromagnetic radiation of the acoustic device 100 and reducing the electromagnetic radiation interference to the entire electronic device.

[0051] In one embodiment, the magnetic circuit system 20 includes a magnetic yoke 21 and a common magnetic portion, a central magnetic portion 23 and a side magnetic portion 24 arranged on the magnetic yoke 21, the common magnetic portion extends along the long side direction, the central magnetic portion 23 includes two, the two central magnetic portions 23 are respectively arranged on both sides of the common magnetic portion, the side magnetic portion 24 includes two, the two side magnetic portions 24 are respectively arranged on both sides of the two central magnetic portions 23, and a magnetic gap is formed between the common magnetic portion and the central magnetic portion 23 and the side magnetic portion 24 located on the same side thereof; wherein the side magnetic portion 24 and the central magnetic portion 23 are vertically magnetized and the magnetization directions of the side magnetic portion 24 and the central magnetic portion 23 forming the same magnetic gap are opposite, the common magnetic portion is horizontally magnetized, and the magnetic poles on both sides of the common magnetic portion are the same as the magnetic poles of the central magnetic portion 23 on the corresponding side facing the magnetic yoke 21.

[0052] Specifically, the common magnetic part, the central magnetic part 23 and the side magnetic part 24 are in a strip shape, and are all extended along the long side direction of the voice coil 22 and arranged on the surface of the magnetic yoke 21 facing the vibration system 30, and the common magnetic part is located in the center, the two central magnetic parts 23 are arranged on both sides of the common magnetic part, and the two side magnetic parts 24 are arranged on both sides of the two central magnetic parts 23, that is, along the short side direction, the two side magnetic parts 24 are located at both ends, and a central magnetic part 23 is provided between each side magnetic part 24 and the common magnetic part. In this way, each central magnetic part 23 can cooperate with the common magnetic part and the side magnetic part 24 on both sides thereof to form a magnetic gap around the central magnetic part 23, and the two formed magnetic gaps are arranged side by side along the short axis direction.

[0053] In addition, in this embodiment, the magnetization direction of the common magnetic part is arranged horizontally, and the central magnetic part 23 and the side magnetic part 24 are magnetized vertically. At the same time, the magnetic poles on both sides of the common magnetic part are made to be the same as the magnetic poles of the central magnetic part 23 on the corresponding side facing the magnetic guide yoke 21, so that the magnetization directions of the side magnetic part 24 and the central magnetic part 23 forming the same magnetic gap are opposite, so that the magnetic field directions of the two long sides of the two voice coils 32 that are adjacent to each other are the same, and the magnetic field directions of the two long sides of the two voice coils 32 that are away from each other are also the same. Figure 3 , Figure 6 The horizontal arrow direction in the figure can make the direction of the force generated by the two voice coils 32 and the magnetic field at the same time the same, and thus make the vibration direction of the two voice coils 32 at the same time the same. It can be understood that the vertical direction refers to the vibration direction of the vibration system 30, and the horizontal direction is perpendicular to the vertical direction. The common magnetic part is magnetized along the first direction.

[0054] The above configuration of this embodiment provides a magnetic field guarantee for the two voice coils 32 with opposite current directions, thereby ensuring that the directions of the forces generated by the two voice coils 32 and the magnetic field are the same, and further making the two voice coils 32 vibrate in the same direction at the same time.

[0055] In one embodiment, the common magnetic part includes a common magnet 22 , which is horizontally magnetized, and the magnetic poles on both sides of the common magnet 22 are the same as the magnetic poles of the central magnetic part 23 on the corresponding side facing the magnetic guide yoke 21 .

[0056] Alternatively, in one embodiment, the common magnetic part includes two common magnets 22 arranged side by side along a first direction, the two common magnets 22 are both horizontally magnetized and have the same magnetization direction, and the magnetic pole of each common magnet 22 corresponding to one end of the central magnetic part 23 is the same as the magnetic pole of the central magnetic part 23 facing the guide yoke 21.

[0057] Both of the above schemes can meet the requirements of the shared magnetic part, and when two shared magnets 22 are used, the magnetic induction intensity of the lateral component can be further increased, thereby increasing the driving force coefficient (BL) of the acoustic device 100 and improving the sound quality effect of the acoustic device 100.

[0058] Specifically, when the common magnetic part includes two common magnets 22 arranged side by side along the first direction, the two common magnets 22 are arranged at intervals, and the distance between the two common magnets 22 is greater than or equal to 0.5 mm. In this way, the magnetic field interaction between the two common magnets 22 can be reduced, and the magnetic induction intensity of each lateral component can be further improved.

[0059] In one embodiment, the surface of the common magnetic part close to the diaphragm assembly 31 is not lower than the surface of the central magnetic part 23 close to the diaphragm assembly 31. Specifically, the surface of the common magnet 22 close to the diaphragm assembly 31 is not lower than the surface of the central magnetic part 23 close to the diaphragm assembly 31.

[0060] Specifically, since the common magnetic part is horizontally magnetized, the magnetic flux lines formed by the common magnetic part are mainly distributed on both sides of the common magnetic part rather than the top. Therefore, in order to ensure the distribution range of the effective magnetic field between the common magnetic part and the central magnetic part 23, the surface of the common magnetic part close to the diaphragm assembly 31 must not be lower than the surface of the central magnetic part 23 close to the diaphragm assembly 31.

[0061] Specifically, optionally, the thickness of the common magnetic part is not less than the thickness of the central magnetic part 23. Exemplarily, the thickness of the common magnetic part is equal to the thickness of the central magnetic part 23, that is, the surface of the common magnet 22 close to the diaphragm assembly 31 is roughly flush with the surface of the central magnetic part 23 close to the diaphragm assembly 31, so that the amplitude of the vibration system 30 is further guaranteed on the basis of a certain thickness of the acoustic device. Alternatively, the magnetic yoke 21 is provided with a protrusion facing the common magnetic part, the common magnetic part is provided on the protrusion, and the thickness of the common magnetic part is at least half of the thickness of the central magnetic part 23.

[0062] In one embodiment, the thickness of the side magnetic portion 24 is not greater than the thickness of the central magnetic portion 23. In the present application, in order to further increase the amplitude of the vibration system 30, the thickness of the side magnetic portion 24 can be appropriately reduced to increase the vibration space of the diaphragm assembly 31.

[0063] In one embodiment, a avoidance groove 211 corresponding to the magnetic gap is provided on the magnetic yoke 21. In this way, the height of the magnetic gap can be further increased to increase the vibration space of the voice coil 32, which can help increase the amplitude of the voice coil 32, that is, help increase the amplitude of the vibration system 30, and help improve the sound quality effect.

[0064] In one embodiment, the central magnetic portion 23 includes a stacked central magnet 231 and a central magnetic conductive plate 232, and the side magnetic portion 24 includes a stacked side magnet 241 and a side magnetic conductive plate 242. The side magnets 241 and the central magnet 231 are vertically magnetized and the magnetization directions of the side magnets 241 and the central magnet 231 that form the same magnetic gap are opposite.

[0065] Specifically, the outer contours of the center magnet 231 and the center magnetic plate 232 are the same, one side of the center magnet 231 is bonded to the magnetic yoke 21, and the other side is bonded to the center magnetic plate 232. The outer contours of the side magnets 241 and the side magnetic plate 242 facing the magnetic gap are substantially the same, and one side of the side magnet 241 is bonded to the magnetic yoke 21, and the other side is bonded to the side magnetic plate 242. Similarly, the side of the common magnetic portion is also bonded to the magnetic yoke 21.

[0066] In one embodiment, the surface of the common magnet 22 close to the diaphragm assembly 31 is not lower than the surface of the central magnetic conductive plate 232 close to the diaphragm assembly 31 .

[0067] Specifically, optionally, the thickness of the shared magnet 22 is not less than the sum of the thicknesses of the central magnet 231 and the central magnetic plate 232. Exemplarily, the thickness of the shared magnet 22 is equal to the sum of the thicknesses of the central magnet 231 and the central magnetic plate 232, that is, the surface of the shared magnet 22 close to the diaphragm assembly 31 is roughly flush with the surface of the central magnetic plate 232 close to the diaphragm assembly 31, so that the amplitude of the vibration system 30 is further guaranteed on the basis of a certain thickness of the acoustic device. Alternatively, the magnetic yoke 21 is provided with a protrusion facing the shared magnet 22, the shared magnet 22 is provided on the protrusion, and the thickness of the shared magnet 22 is at least half of the sum of the thicknesses of the central magnet 231 and the central magnetic plate 232.

[0068] In one embodiment, the housing 10 is further included. The housing 10 has a first side and a second side that are opposite to each other. The first side is connected to the diaphragm assembly 31 , and the second side is connected to the magnetic circuit system 20 .

[0069] Specifically, the shell 10 is formed into a hollow rectangular frame structure, and along its axial direction, the shell 10 has a first side and a second side opposite to each other, wherein the first side is connected to the diaphragm assembly 31, and the second side is connected to the magnetic circuit system 20. Exemplarily, the width of the shell 10 is substantially the same as the maximum distance between the two side magnetic portions 24, and the second side of the shell 10 is connected to the top surface of the side magnetic portion 24 facing the vibration system 30. In this embodiment, the shell 10 and the side magnetic conductive plate 242 are formed as an integrally formed injection molded part, so that the second side surface of the shell 10 is connected to the top surface of the side magnetic portion 24 facing the vibration system 30. In this way, the connection strength between the magnetic circuit system 20 and the shell 10 can be further improved. Of course, in order to improve the connection between the shell 10 and the magnetic circuit system 20, the second side surface of the shell 10 can also form a connecting column on the two short axes, and is connected to the magnetic conductive yoke 21 by connection.

[0070] Of course, in other embodiments, the housing 10 may also be disposed around the edge magnetic portion 24 and the second side may be connected to the magnetic yoke 21 .

[0071] In one embodiment, the diaphragm assembly 31 includes an annular diaphragm 311 and a vibration plate 312 . The diaphragm 311 includes an outer fixing portion, a folded ring portion and an inner fixing portion from the outside to the inside. The outer fixing portion is connected to the shell 10 , and the inner fixing portion is connected to the vibration plate 312 .

[0072] Specifically, the outer fixing portion is connected to the first side of the shell 10 by bonding, and in order to improve the connection strength, the outer edge of the outer fixing portion is also folded toward one side of the shell 10 to form a flange to connect with the side of the shell 10.

[0073] In one embodiment, the folding ring portion includes a first folding ring and a second folding ring connected to an inner edge of the first folding ring, and the first folding ring and the second folding ring are recessed in opposite directions.

[0074] Specifically, by setting the folding ring portion as a first folding ring and a second folding ring, and making the concave directions of the two opposite, the linear range of the compliance of the diaphragm assembly 21 can be widened to a certain extent, THD (total harmonic distortion) and HOHD (higher harmonic distortion) can be reduced, and the sound quality of the acoustic device 100 can be improved. Exemplarily, the first folding ring is concave toward the outside of the shell 10, and the second folding ring is concave toward the inside of the shell 10.

[0075] In one embodiment, an annular protrusion is formed on the vibration plate 312 toward the magnetic circuit system 20, and the voice coil 32 is connected to the annular protrusion. Providing the annular protrusion on the vibration plate 312 is beneficial to improving the strength of the vibration plate 312 on the one hand, and is beneficial to adjusting the height of the voice coil 32 on the other hand, so that it can be fully inserted into the magnetic gap, that is, increasing the effective coil length in the magnetic field, that is, improving the driving force coefficient (BL) of the acoustic device 100, thereby improving the sound quality effect of the acoustic device 100.

[0076] In one embodiment, a plurality of centering support plates 33 are further included, one end of each centering support plate 33 is connected to the shell 10, and the other end is connected to at least one voice coil 32; wherein the centering support plate 33 includes a first centering support plate 331 having two spot welding pads 333 and a second centering support plate 332 having four spot welding pads 333; the voice coil 32 includes a first voice coil 321 and a second voice coil 322, the outlet end of the first voice coil 321 is connected to the spot welding pad 333 of the first centering support plate 331, the inlet end of the first voice coil 321 is connected to the spot welding pad 333 of the second centering support plate 332, the inlet end of the second voice coil 322 is connected to the spot welding pad 333 of the first centering support plate 331, and the outlet end of the second voice coil 322 is connected to the spot welding pad 333 of the second centering support plate 332.

[0077] Specifically, the first centering support plate 331 and the second centering support plate 332 each include a first connecting portion for connecting to the shell 10, a second connecting portion for connecting to the voice coil 32, and a vibration arm connected between the first connecting portion and the second connecting portion. The two first connecting portions are respectively connected to the second side of the shell 10, and the two second connecting portions are respectively connected to the ends of the corresponding short sides of the first voice coil 321 and the second voice coil 322.

[0078] At the same time, the second connection portion of the first centering support plate 331 is provided with two spot welding pads 333, and the two spot welding pads 333 are respectively connected to the output end lead of the first voice coil 321 and the input end lead of the second voice coil 322, so that the first voice coil 321 and the second voice coil 322 are connected in series, simplifying the arrangement of the two voice coils 32 and the centering support plate 33.

[0079] The second connection part of the second voice coil 322 is provided with two spot welding pads 333, and the two spot welding pads 333 are respectively connected to the input end lead of the first voice coil 321 and the output end lead of the second voice coil 322. At the same time, the first connection part of the second voice coil 322 is also provided with two spot welding pads 333, and each spot welding pad 333 is connected to a spot welding pad 333 of the second connection part, so that the two voice coils 32 can be connected to the external circuit.

[0080] The second aspect of the present invention further provides an electronic device, comprising any one of the above-mentioned acoustic devices 100. The structure of the acoustic device 100 refers to the above-mentioned embodiment. Since the electronic device in this embodiment includes the acoustic device 100 in all the above-mentioned embodiments, it also has at least the beneficial effects of the above-mentioned embodiments, which will not be repeated here.

[0081] The electronic device in this embodiment can be a mobile phone, a tablet, a computer, or a wearable device such as VR or AR.

[0082] 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 aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned 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. An acoustic device, characterized in that: include: A magnetic circuit system having two magnetic gaps arranged side by side in a first direction; A vibration system, comprising a diaphragm assembly and two voice coils, wherein the diaphragm assembly is arranged opposite to the magnetic circuit system, the two voice coils are arranged side by side along the first direction, one end of the two voice coils is connected to the diaphragm assembly, and the other end is respectively located in two magnetic gaps, and each of the voice coils has a long side along the length direction and a short side along the width direction, and the extension direction of the short side is parallel to the first direction; wherein, The current direction of one voice coil is clockwise, and the current direction of the other voice coil is counterclockwise.

2. The acoustic device according to claim 1, characterized in that The magnetic circuit system includes a magnetic yoke and a common magnetic part, a central magnetic part and a side magnetic part arranged on the magnetic yoke, the central magnetic part includes two and is arranged on both sides of the common magnetic part, the side magnetic part includes two and is arranged on both sides of the two central magnetic parts, and the magnetic gap is formed between the common magnetic part and the central magnetic part and the side magnetic part located on the same side thereof; wherein, The side magnetic portion and the center magnetic portion are magnetized vertically and the magnetization directions of the side magnetic portion and the center magnetic portion that form the same magnetic gap are opposite, the common magnetic portion is magnetized horizontally, and the magnetic poles on both sides of the common magnetic portion are the same as the magnetic poles of the center magnetic portion on the corresponding side facing the magnetic yoke.

3. The acoustic device according to claim 2, characterized in that The common magnetic part includes a common magnet, the common magnet is magnetized horizontally, and the magnetic poles on both sides of the common magnet are the same as the magnetic poles of the central magnetic part on the corresponding side facing the magnetic yoke.

4. The acoustic device according to claim 2, characterized in that The common magnetic part includes two common magnets arranged side by side along the first direction. Both common magnets are magnetized horizontally and in the same magnetization direction. The magnetic pole of each common magnet corresponding to one end of the central magnetic part is the same as the magnetic pole of the central magnetic part facing the magnetic yoke.

5. The acoustic device according to claim 4, characterized in that The two common magnets are arranged at an interval, and the distance between the two common magnets is ≥0.5mm.

6. The acoustic device according to any one of claims 2 to 5, characterized in that: A surface of the common magnetic portion close to the diaphragm assembly is not lower than a surface of the central magnetic portion close to the diaphragm assembly.

7. The acoustic device according to claim 6, characterized in that The thickness of the common magnetic part is not less than the thickness of the central magnetic part; Alternatively, the magnetically conductive yoke is provided with a protrusion facing the common magnetic portion, the common magnetic portion is provided on the protrusion, and the thickness of the common magnetic portion is at least half of the thickness of the central magnetic portion; and / or, the thickness of the edge magnetic portion is not greater than the thickness of the central magnetic portion; And / or, the magnetic yoke is provided with an avoidance groove corresponding to the magnetic gap.

8. The acoustic device according to any one of claims 2 to 5, characterized in that: The central magnetic part includes a stacked central magnet and a central magnetic conductive plate, and the side magnetic part includes stacked side magnets and side magnetic conductive plates. The side magnets and the central magnet are vertically magnetized and the magnetization directions of the side magnets and the central magnet that form the same magnetic gap are opposite.

9. The acoustic device according to any one of claims 1 to 5, characterized in that: It also includes a shell, which has a first side and a second side that are arranged opposite to each other, the first side is connected to the diaphragm assembly, and the second side is connected to the magnetic circuit system.

10. The acoustic device according to claim 9, characterized in that The diaphragm assembly includes an annular diaphragm and a vibration plate, wherein the diaphragm includes an outer fixing portion, a folding ring portion and an inner fixing portion from the outside to the inside, wherein the outer fixing portion is connected to the housing, and the inner fixing portion is connected to the vibration plate; An annular protrusion facing the magnetic circuit system is formed on the vibration plate, and the voice coil is connected to the annular protrusion.

11. An electronic device, characterized in that: The acoustic device comprises any one of claims 1 to 10.

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