Acoustic device and electronic apparatus

Abstract

The utility model 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; 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, one ends of the two voice coils are connected to the vibrating diaphragm assembly, and the other ends of the two voice coils are located in the two magnetic gaps respectively; wherein the current direction of one voice coil is clockwise, and the current direction of the other voice coil is anticlockwise. The acoustic device provided by the utility model has lower electromagnetic radiation, so that the electromagnetic radiation interference on the whole electronic equipment is smaller, and the performance of the whole electronic equipment is further improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to electric -acoustic conversion technical field, and concretely relates to an acoustic device and electronic equipment. BACKGROUND

[0002] In order to adapt the light and thin development trend of intelligent device, acoustic device also needs to develop synchronously light and thin. In order to guarantee the acoustic performance of light and thin acoustic device, the related technology provides an acoustic device with double voice coils and five magnets. Although the acoustic device can guarantee its acoustic performance while reducing the thickness, due to the same current direction of double voice coils, the electromagnetic effect generated by double voice coils will interfere with other parts of the whole machine during normal operation, and then affect the overall performance of the whole machine. Therefore, how to reduce the electromagnetic interference of acoustic device becomes the technical problem to be solved currently.

[0003] In view of the above shortcomings, the utility model is provided. UTILITY MODEL CONTENT

[0004] The utility model aims at providing an acoustic device and electronic equipment to at least partially reduce the electromagnetic interference problem in the acoustic device.

[0005] The utility model provides an acoustic device in a first aspect, comprising:

[0006] A magnetic circuit system has two magnetic gaps side by side;

[0007] A vibration system includes a diaphragm assembly and two voice coils, the diaphragm assembly and the magnetic circuit system are oppositely arranged, two voice coils are arranged side by side, and one end of two voice coils is connected to the diaphragm assembly, and the other end is located in two magnetic gaps respectively;Wherein,

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

[0009] The acoustic device provided by the utility model can also have the following additional technical features:

[0010] In one specific embodiment of the utility model, the magnetic circuit system includes a magnetic yoke, a common magnetic part, a center magnetic part and a side magnetic part arranged on the magnetic yoke, the center magnetic part includes two and is arranged on the two sides of the common magnetic part, the side magnetic part includes two and is arranged on the two sides of the two center magnetic parts, the magnetic gap is formed between the common magnetic part and the center magnetic part and the side magnetic part located on the same side thereof;Wherein,

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

[0012] In one specific embodiment of the present application, the common magnetic part comprises one 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 center magnetic part on the corresponding side and facing the magnetic yoke.

[0013] In one specific embodiment of the present application, the common magnetic part comprises two common magnets arranged side by side along the arrangement direction of the voice coil, both common magnets are horizontally magnetized and have the same magnetization direction, and the magnetic poles of each common magnet corresponding to one end of the center magnetic part are the same as the magnetic poles of the center magnetic part facing the magnetic yoke.

[0014] In one specific embodiment of the present application, the two common magnets are arranged at intervals, and the interval between the two common magnets is greater than or equal to 0.5 mm.

[0015] In one specific embodiment of the present application, the surface of the common magnetic part close to the diaphragm assembly is not lower than the surface of the center magnetic part close to the diaphragm assembly.

[0016] In one specific embodiment of the present application, the thickness of the common magnetic part is not less than the thickness of the center magnetic part.

[0017] Alternatively, the magnetic yoke is provided with a protrusion facing the common magnetic part, the common magnetic part is arranged on the protrusion, and the thickness of the common magnetic part is at least half of the thickness of the center magnetic part.

[0018] And / or, the thickness of the edge magnetic part is not greater than the thickness of the center magnetic part.

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

[0020] In one specific embodiment of the present application, the center magnetic part comprises a center magnet and a center magnetic guide plate arranged in layers, the edge magnetic part comprises an edge magnet and an edge magnetic guide plate arranged in layers, and the edge magnet and the center magnet are vertically magnetized and have opposite magnetization directions.

[0021] In one specific embodiment of the present application, a housing is further included, the housing has a first side and a second side arranged oppositely, the first side is connected with the diaphragm assembly, and the second side is connected with the magnetic circuit system.

[0022] In one specific embodiment of the present application, the diaphragm assembly comprises an annular diaphragm and a vibrating plate, the diaphragm comprises, in order from the outside, an outer fixed portion, a folded ring portion and an inner fixed portion, the outer fixed portion is connected with the shell, and the inner fixed portion is connected with the vibrating plate.

[0023] The present application also provides an electronic device comprising the acoustic device as described in any one of the above.

[0024] The acoustic device of the present application comprises a magnetic circuit system with a magnetic gap and a vibrating system with a voice coil inserted in the magnetic gap. When the voice coil is energized, it drives the diaphragm assembly to vibrate and produce sound, thus the acoustic device has the sound production function. By arranging two magnetic gaps and two corresponding voice coils, the effective length for driving the voice coil to vibrate in the magnetic circuit system is increased, i.e. the driving force coefficient (BL) of the sound production device is improved, thus the sound quality effect of the acoustic device is improved, and the above improvement can offset the influence of the thickness reduction of the acoustic device on the performance of the acoustic device, thus the sound quality effect of the light and thin electronic device is ensured. In addition, since the current directions of the two voice coils are opposite, the electric energy generated when the voice coils are energized and vibrate can be offset, thus the electromagnetic radiation of the acoustic device is reduced, and the electromagnetic radiation interference on the whole electronic device is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the description of the embodiments or the prior art will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0026] Figure 1 FIG. 1 is a perspective view of an acoustic device in an embodiment of the present application;

[0027] Figure 2 FIG. 2 is a front view of the acoustic device in the embodiment of the present application; Figure 1

[0028] Figure 3 FIG. 4 is a sectional view of A-A in the embodiment of the present application; Figure 2

[0029] Figure 4 FIG. 6 is a magnetic flux density simulation diagram of the magnetic circuit system in the embodiment of the present application; Figure 3

[0030] Figure 5 FIG. 8 is a structural exploded view of the acoustic device in the embodiment of the present application; Figure 3

[0031] Figure 6 ​​​​for another embodiment Figure 2 a cross-sectional view along A-A in

[0032] Figure 7 for Figure 6 a magnetic flux density simulation diagram of the magnetic circuit system in

[0033] Figure 8 for another perspective of the acoustic device in the embodiment of the utility model.

[0034] Explanation of reference signs:

[0035] 100 - acoustic device;

[0036] 10 - housing;

[0037] 20 - magnetic circuit system, 21 - magnetic yoke, 211 - avoiding groove; 22 - common magnet, 23 - center magnetic part, 231 - center magnet, 232 - center magnetic plate, 24 - edge magnetic part, 241 - edge magnet, 242 - edge magnetic plate;

[0038] 30 - vibration system, 31 - diaphragm assembly, 311 - diaphragm, 312 - vibration plate; 32 - voice coil, 321 - first voice coil, 322 - second voice coil, 33 - centering sheet, 331 - first centering sheet, 332 - second centering sheet, 333 - spot welding pad. DETAILED DESCRIPTION

[0039] Exemplary embodiments of the present utility model will be described hereinafter in detail with reference to the accompanying drawings. Although exemplary embodiments of the present utility model are shown in the drawings, it is understood that the present utility model can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this utility model can be more thoroughly understood, and the scope of the present utility model can be conveyed completely to those skilled in the art.

[0040] It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises", "comprising", "includes", "including" and "has" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order in which they are described, unless specifically identified as an order dependent step. It is also to be understood that additional or alternative steps can be employed.

[0041] Although the terms first, second, third, etc. can be used herein to describe various 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 be only used to distinguish one element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates otherwise, terms such as "first", "second" and other numerical terms when used in the singular or plural herein do not imply a sequence or order unless the context clearly indicates otherwise. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

[0042] For ease of description, spatial relative terms can be used herein to describe a relationship of one element or feature to another element or feature as shown in the drawings, such as "inner", "outer", "inward", "outward", "lower", "below", "upper", "above", and the like. Such spatial relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the drawings. For example, if the device is turned over, then an element described as "below" or "beneath" another element or feature would be oriented "above" or "over" the other element or feature. Thus, the example term "below" can encompass both an orientation of above and below. The device can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0043] The acoustic device 100 provided by the embodiments of the present application can be used in electronic devices, and enables the electronic devices to have sound emitting function. Meanwhile, the acoustic device 100 provided by the embodiments of the present application has weak electromagnetic effect, thereby further reducing electromagnetic radiation interference to the whole electronic device.

[0044] With reference to Figures 1 to 8 The acoustic device 100 provided by the first aspect of the embodiments of the present application comprises a magnetic circuit system 20 and a vibration system 30. The magnetic circuit system 20 has two magnetic gaps arranged side by side. The vibration system 30 comprises a diaphragm assembly 31 and two voice coils 32. The diaphragm assembly 31 is arranged opposite to the magnetic circuit system 20. The two voice coils 32 are arranged side by side. One end of the two voice coils 32 is connected to the diaphragm assembly 31, and the other end of the two voice coils 32 is located in the two magnetic gaps respectively. The current direction of one voice coil 32 is clockwise, and the current direction of the other voice coil 32 is counterclockwise.

[0045] Specifically, the acoustic device 100 is formed as a substantially cuboid, the length direction is the long axis, the width direction is the short axis, and the thickness direction is the vibration direction of the vibration system 30. Correspondingly, the magnetic circuit system 20 and the vibration system 30 also have long and short axes, and the long axes of the magnetic circuit system 20 and the vibration system 30 are arranged correspondingly to the long axis of the acoustic device 100, and the short axes of the magnetic circuit system 20 and the vibration system 30 are arranged correspondingly to the long axis of the acoustic device 100.

[0046] The magnetic circuit system 20 is provided with two annular magnetic gaps, both of which extend along the long axis direction, that is, the length direction of the magnetic gap is parallel to the long axis direction, and the two magnetic gaps are arranged side by side along the short axis direction.

[0047] The diaphragm assembly 31 in the vibration system 30 is arranged above the magnetic circuit system 20 in a coaxial manner with the magnetic circuit system 20, and one end of the two voice coils 32 is connected to the diaphragm assembly 31, and the other end is respectively inserted into the two magnetic gaps. Since the magnetic gap has a magnetic field, when the voice coil 32 is energized, it will be subjected to the magnetic field force and can vibrate in the magnetic gap, thereby driving the diaphragm assembly 31 to vibrate and emit sound.

[0048] Since the magnetic gap and the voice coil 32 in the embodiment are both two, compared with the single voice coil 32 structure, the 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, improve the driving force coefficient (BL) of the acoustic device 100, thereby improving the sound quality effect of the acoustic device 100. Correspondingly, when the thickness of the acoustic device 100 is thinned, the above-mentioned improvement brought by the setting of two magnetic gaps and voice coils 32 can offset the influence of the thickness reduction on the performance of the acoustic device 100, thereby ensuring the sound quality effect of the light and thin electronic equipment.

[0049] In addition, since the current directions of the two voice coils 32 in the embodiment are clockwise and counterclockwise, that is, the current directions of the two voice coils 32 are opposite, so that the electromagnetic energy generated when the two voice coils 32 are energized and vibrate can be offset, thereby having smaller electromagnetic radiation. Compared with the scheme that the current directions of the two voice coils 32 are the same, the embodiment can reduce the electromagnetic radiation of the acoustic device 100 and reduce the electromagnetic radiation interference on the whole electronic equipment.

[0050] The acoustic device 100 of the embodiment of the utility model has the sound production function through setting the magnetic gap having the magnetic circuit system 20 and the vibration system 30 inserted in the magnetic gap of voice coil 32, so that voice coil 32 can drive the vibration of diaphragm assembly 31 to produce sound when energized, and further make acoustic device 100 have the sound production function. At the same time, by setting two magnetic gaps and corresponding two voice coils 32, so as to increase the effective length of magnetic circuit system 20 for driving the vibration of voice coil 32, that is, to improve the driving force coefficient (BL) of acoustic device 100, so as to improve the sound quality effect of acoustic device 100, and the above-mentioned promotion can offset the influence of the thickness reduction of acoustic device 100 on the performance of acoustic device 100, and further ensure the sound quality effect of the light and thin electronic equipment. In addition, since the current directions of the two voice coils 32 are opposite, so the electric energy generated when energized and vibrating can be offset each other, so as to have smaller electromagnetic radiation, so as to reduce the electromagnetic radiation of acoustic device 100, and reduce the electromagnetic radiation interference to the whole machine of electronic equipment.

[0051] In one embodiment, the 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. In this way, the voice coil 32 is arranged along the extension direction of the short side, that is, the two magnetic gaps are both extended along the length direction, that is, the length direction of the magnetic gap is parallel to the long side direction of the voice coil. In this way, the utilization rate of the magnetic circuit system 20 is further improved, the driving force coefficient (BL) of the acoustic device 100 is improved, and thus the sound quality effect of the acoustic device 100 can be improved.

[0052] In one embodiment, the magnetic circuit system 20 includes a magnetic yoke 21, a common magnetic part, a center magnetic part 23 and a side magnetic part 24 arranged on the magnetic yoke 21, the center magnetic part 23 includes two, the two center magnetic parts 23 are respectively arranged on the two sides of the common magnetic part, the side magnetic part 24 includes two, the two side magnetic parts 24 are respectively arranged on the two sides of the two center magnetic parts 23, and the magnetic gap is formed between the common magnetic part and the center magnetic part 23 and the side magnetic part 24 located on the same side thereof; wherein the side magnetic part 24 and the center magnetic part 23 are vertically magnetized, the magnetization directions of the side magnetic part 24 and the center magnetic part 23 forming the same magnetic gap are opposite, the common magnetic part is horizontally magnetized, and the magnetic poles on both sides of the common magnetic part are the same as the magnetic poles of the corresponding side center magnetic part 23 facing the magnetic yoke 21.

[0053] Specifically, the common magnetic portion, the center magnetic portions 23 and the side magnetic portions 24 are specifically in the shape of a strip and are arranged on the surface of the magnetic yoke 21 facing the vibration system 30, and the common magnetic portion is located at the center, the two center magnetic portions 23 are arranged on the two sides of the common magnetic portion, and the two side magnetic portions 24 are arranged on the two sides of the two center magnetic portions 23, that is, the two side magnetic portions 24 are located at the two ends, and one center magnetic portion 23 is arranged between each side magnetic portion 24 and the common magnetic portion. In this way, each center magnetic portion 23 can cooperate with the common magnetic portion and the side magnetic portion 24 on its two sides to form a magnetic gap around the center magnetic portion 23. Further, the common magnetic portion, the center magnetic portions 23 and the side magnetic portions 24 all extend along the long side direction of the voice coil 22, and the two magnetic gaps formed are arranged side by side along the short side direction.

[0054] And in this embodiment, the magnetizing direction of the common magnetic portion is horizontally arranged, while the center magnetic portions 23 and the side magnetic portions 24 are vertically magnetized, and the magnetic poles on the two sides of the common magnetic portion are the same as the magnetic poles of the corresponding side center magnetic portion 23 facing the magnetic yoke 21, and the magnetizing directions of the side magnetic portion 24 and the center magnetic portion 23 forming the same magnetic gap are opposite, referring to the horizontally arranged arrow direction in Figure 3 、 Figure 6 , the force directions generated by the two voice coils 32 in the magnetic field at the same time can be the same, and thus the vibration directions of the two voice coils 32 at the same time are 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 portion is magnetized along the arrangement direction of the voice coil 22.

[0055] The above arrangement of the two voice coils 32 with opposite magnetizing directions in this embodiment provides magnetic field protection, thereby ensuring that the force directions generated by the two voice coils 32 in the magnetic field at the same time are the same, and thus the vibration directions of the two voice coils 32 at the same time are the same.

[0056] In one embodiment, the common magnetic portion includes one common magnet 22, the common magnet 22 is horizontally magnetized, and the magnetic poles on the two sides of the common magnet 22 are the same as the magnetic poles of the corresponding side center magnetic portion 23 facing the magnetic yoke 21.

[0057] Alternatively, in one embodiment, the common magnetic portion includes two common magnets 22 arranged side by side along the arrangement direction of the voice coil 22, both of the two common magnets 22 are horizontally magnetized and have the same magnetizing direction, and the magnetic poles of each common magnet 22 corresponding to one end of the center magnetic portion 23 are the same as the magnetic poles of the center magnetic portion 23 facing the magnetic yoke 21.

[0058] Both of the above two schemes can meet the requirements of the common magnetic portion, and when two common magnets 22 are used, the magnetic induction strength of the transverse component can be further increased, thereby improving the driving force coefficient (BL) of the acoustic device 100 and improving the sound quality effect of the acoustic device 100.

[0059] Specifically, when the common magnetic part includes two common magnets 22 arranged side by side, the two common magnets 22 are spaced apart, 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 strength of the respective transverse components can be further improved.

[0060] In one embodiment, the surface of the common magnetic part on the side close to the diaphragm assembly 31 is not lower than the surface of the center magnetic part 23 on the side close to the diaphragm assembly 31. Specifically, the surface of the common magnet 22 on the side close to the diaphragm assembly 31 is not lower than the surface of the center magnetic part 23 on the side close to the diaphragm assembly 31.

[0061] Specifically, since the common magnetic part is magnetized in the horizontal direction, the magnetic field lines formed by the common magnetic part are mainly distributed on the two 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 center magnetic part 23, the surface of the common magnetic part on the side close to the diaphragm assembly 31 needs to be not lower than the surface of the center magnetic part 23 on the side close to the diaphragm assembly 31.

[0062] Specifically, the thickness of the common magnetic part is not less than the thickness of the center magnetic part 23. For example, the thickness of the common magnetic part is equal to the thickness of the center magnetic part 23, that is, the surface of the common magnet 22 on the side close to the diaphragm assembly 31 is substantially flush with the surface of the center magnetic part 23 on the side close to the diaphragm assembly 31. In this way, the amplitude of the vibration system 30 can be further ensured 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, and the common magnetic part is arranged on the protrusion. The thickness of the common magnetic part is at least half of the thickness of the center magnetic part 23.

[0063] In one embodiment, the thickness of the side magnetic part 24 is not greater than the thickness of the center magnetic part 23. In order to further improve the amplitude of the vibration system 30, the thickness of the side magnetic part 24 can be appropriately reduced to increase the vibration space of the diaphragm assembly 31.

[0064] In one embodiment, the magnetic yoke 21 is provided with a relief groove 211 corresponding to the magnetic gap. 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 be beneficial to improve the amplitude of the voice coil 32, that is, beneficial to improve the amplitude of the vibration system 30 and improve the sound quality effect.

[0065] In one embodiment, the center magnetic part 23 includes a center magnet 231 and a center magnetic plate 232 arranged in layers, the side magnetic part 24 includes a side magnet 241 and a side magnetic plate 242 arranged in layers, the side magnet 241 and the center magnet 231 are vertically magnetized, and the magnetization directions of the side magnet 241 and the center magnet 231 are opposite.

[0066] Specifically, the outer contour of the center magnet 231 and the center magnetic plate 232 is 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 contour of the side magnet 241 and the side magnetic plate 242 on the side facing the magnetic gap is 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 part is also bonded to the magnetic yoke 21.

[0067] In an embodiment, the surface of the common magnet 22 on the side close to the diaphragm assembly 31 is not lower than the surface of the center magnetic plate 232 on the side close to the diaphragm assembly 31.

[0068] Specifically, the thickness of the common magnet 22 is not less than the sum of the thicknesses of the center magnet 231 and the center magnetic plate 232. For example, the thickness of the common magnet 22 is equal to the sum of the thicknesses of the center magnet 231 and the center magnetic plate 232, that is, the surface of the common magnet 22 on the side close to the diaphragm assembly 31 is substantially flush with the surface of the center magnetic plate 232 on the side close to the diaphragm assembly 31, which further ensures the amplitude of the vibration system 30 on the basis of the thickness of the acoustic device. Alternatively, the magnetic yoke 21 is provided with a protrusion facing the common magnet 22, and the common magnet 22 is arranged on the protrusion, and the thickness of the common magnet 22 is at least half of the sum of the thicknesses of the center magnet 231 and the center magnetic plate 232.

[0069] In an embodiment, a housing 10 is further included, the housing 10 has a first side and a second side arranged oppositely, the first side is connected with the diaphragm assembly 31, and the second side is connected with the magnetic circuit system 20.

[0070] Specifically, the housing 10 is formed as a hollow rectangular frame structure, and has a first side and a second side arranged oppositely in the axial direction, wherein the first side is connected with the diaphragm assembly 31, and the second side is connected with the magnetic circuit system 20. For example, the width of the housing 10 is substantially the same as the maximum distance between the two side magnetic parts 24, and the second side of the housing 10 is connected with the top surface of the side magnetic part 24 facing the vibration system 30. In this embodiment, the housing 10 and the side magnetic plate 242 are formed as an integrally molded injection molding part, so that the second side of the housing 10 is connected to the top surface of the side magnetic part 24 facing the vibration system 30. This can further improve the connection strength of the magnetic circuit system 20 and the housing 10. Of course, to improve the connection between the housing 10 and the magnetic circuit system 20, the second side of the housing 10 can also form a connecting column on the two short axes and be connected to the magnetic yoke 21.

[0071] Of course, in other embodiments, the housing 10 can also be arranged around the side magnetic part 24 and connected to the magnetic yoke 21 on the second side.

[0072] In one embodiment, the diaphragm assembly 31 comprises a ring-shaped diaphragm 311 and a vibrating plate 312, the diaphragm 311 comprises, from outside to inside, an outer fixed part, a folded ring part and an inner fixed part in sequence, the outer fixed part is connected with the shell 10, and the inner fixed part is connected with the vibrating plate 312.

[0073] Specifically, the outer fixed part is connected with the first side of the shell 10 by means of adhesion, and in order to improve the connection strength, the outer edge of the outer fixed part is further folded to form a flange towards the side of the shell 10 to be connected with the side of the shell 10.

[0074] In one embodiment, the folded ring part comprises a first folded ring and a second folded ring connected with the inner edge of the first folded ring, and the recess directions of the first folded ring and the second folded ring are opposite.

[0075] Specifically, by setting the folded ring part as the first folded ring and the second folded ring and making the recess directions of the two opposite, the linear range of compliance of the diaphragm assembly 21 can be widened to a certain extent, the THD (total harmonic distortion) and the HOHD (high order harmonic distortion) can be reduced, and the sound quality of the acoustic device 100 can be improved. For example, the first folded ring is recessed outwardly of the shell 10, and the second folded ring is recessed inwardly of the shell 10.

[0076] In one embodiment, the vibrating plate 312 is formed with a ring-shaped protrusion towards the magnetic circuit system 20, and the voice coil 32 is connected to the ring-shaped protrusion. The ring-shaped protrusion on the vibrating plate 312 is beneficial to improve the strength of the vibrating plate 312, and is also beneficial to adjust the height of the voice coil 32 so that it can be fully inserted into the magnetic gap, i.e. the effective coil length in the magnetic field is increased, i.e. the driving force coefficient (BL) of the acoustic device 100 is improved, thereby the sound quality effect of the acoustic device 100 can be improved.

[0077] In one embodiment, a plurality of centering branches 33 are further included, one end of each centering branch 33 is connected with the shell 10, and the other end is connected with at least one voice coil 32; wherein the centering branch 33 comprises a first centering branch 331 with two spot welding pads 333 and a second centering branch 332 with four spot welding pads 333; the voice coil 32 comprises a first voice coil 321 and a second voice coil 322, the outgoing line end of the first voice coil 321 is connected with the spot welding pad 333 of the first centering branch 331, the incoming line end of the first voice coil 321 is connected with the spot welding pad 333 of the second centering branch 332, the incoming line end of the second voice coil 322 is connected with the spot welding pad 333 of the first centering branch 331, and the outgoing line end of the second voice coil 322 is connected with the spot welding pad 333 of the second centering branch 332.

[0078] Specifically, the first centering branch 331 and the second centering branch 332 each include a first connecting portion for connecting with the shell 10, a second connecting portion for connecting with the voice coil 32, and a vibration arm connected between the first connecting portion and the second connecting portion, and the two first connecting portions are connected to the second side of the shell 10 respectively, and the two second connecting portions are connected to the corresponding end portions of the first voice coil 321 and the second voice coil 322 respectively.

[0079] Meanwhile, the second connecting portion of the first centering branch 331 is provided with two spot welding pads 333, and the two spot welding pads 333 are connected with the outgoing line lead of the first voice coil 321 and the incoming line lead of the second voice coil 322 respectively, so as to connect the first voice coil 321 and the second voice coil 322 in series.

[0080] The second connecting portion of the second voice coil 322 is provided with two spot welding pads 333, and the two spot welding pads 333 are connected with the incoming line lead of the first voice coil 321 and the outgoing line lead of the second voice coil 322 respectively, and meanwhile, the first connecting portion of the second voice coil 322 is also provided with two spot welding pads 333, and each spot welding pad 333 is connected with the spot welding pad 333 of one second connecting portion, so as to connect the two voice coils 32 with the external circuit.

[0081] The second aspect of the utility model further provides an electronic device, including the acoustic device 100 of any one of the above. The structure of the acoustic device 100 is referred to the above embodiment. Since the electronic device in the embodiment includes the acoustic device 100 in all the above embodiments, it also has at least the beneficial effects of the above embodiments, which will not be repeated here.

[0082] The electronic device in the embodiment can be a mobile phone, a tablet, a computer or a wearable device such as VR and AR.

[0083] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the utility model, but not to limit them; although the utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the above embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. An acoustic device, characterized by The acoustic device comprises: a magnetic circuit system having two magnetic gaps arranged side by side; a vibration system comprising a diaphragm assembly and two voice coils, the diaphragm assembly and the magnetic circuit system being arranged oppositely, the two voice coils being arranged side by side, and one end of the two voice coils being connected to the diaphragm assembly and the other end being located in the two magnetic gaps respectively; 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 of claim 1, wherein, The magnetic circuit system comprises a magnetic yoke, a common magnetic part, a central magnetic part and a side magnetic part arranged on the magnetic yoke, the central magnetic part comprises two parts and is arranged on both sides of the common magnetic part, the side magnetic part comprises two parts and is arranged on both sides of the central magnetic part, and the magnetic gap is formed between the common magnetic part and the central magnetic part and the side magnetic part on the same side; wherein the side magnetic part and the central magnetic part are vertically magnetized, the magnetization direction of the side magnetic part and the central magnetic part forming the same magnetic gap is opposite, the common magnetic part is horizontally magnetized, and the magnetic poles on both sides of the common magnetic part are the same as the magnetic poles of the corresponding side of the central magnetic part facing the magnetic yoke.

3. The acoustic device of claim 2, wherein, The common magnetic part comprises 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 corresponding side of the central magnetic part facing the magnetic yoke.

4. The acoustic device of claim 2, wherein, The common magnetic part comprises two common magnets arranged side by side along the arrangement direction of the voice coil, both common magnets are horizontally magnetized and have the same magnetization direction, and the magnetic poles of each common magnet corresponding to one end of the central magnetic part are the same as the magnetic poles of the central magnetic part facing the magnetic yoke.

5. The acoustic device of claim 4, wherein, The two common magnets are arranged at a distance of greater than or equal to 0.5 mm.

6. An acoustic device according to any one of claims 2 to 5, wherein, The surface of the common magnetic part close to the diaphragm assembly is not lower than the surface of the central magnetic part close to the diaphragm assembly.

7. The acoustic device of claim 6, wherein, The thickness of the common magnetic part is not less than the thickness of the central magnetic part. Alternatively, the magnetic yoke is provided with a protrusion facing the common magnetic part, the common magnetic part is arranged on the protrusion, and the thickness of the common magnetic part is at least half of the thickness of the central magnetic part. And / or, the thickness of the side magnetic part is not greater than the thickness of the central magnetic part. And / or, the magnetic yoke is provided with a relief groove corresponding to the magnetic gap.

8. An acoustic device according to any one of claims 2 to 5, wherein, The central magnetic part comprises a central magnet and a central magnetic plate arranged in layers, the side magnetic part comprises a side magnet and a side magnetic plate arranged in layers, and the side magnet and the central magnet are vertically magnetized and have opposite magnetization directions.

9. The acoustic device according to any one of claims 1 to 5, wherein, Further comprising a shell having a first side and a second side arranged oppositely, the first side being connected with the diaphragm assembly, and the second side being connected with the magnetic circuit system.

10. The acoustic device of claim 9, wherein, The diaphragm assembly comprises a ring-shaped diaphragm and a vibrating plate, the diaphragm comprises an outer fixed part, a folded ring part and an inner fixed part from outside to inside, the outer fixed part is connected with the shell, and the inner fixed part is connected with the vibrating plate.

11. An electronic device, comprising: The acoustic device comprises any one of claims 1-10.

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