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, the magnetic circuit system comprises a magnetic conductive yoke, and a common magnetic part, a central magnetic part and an edge magnetic part which are arranged on the magnetic conductive yoke, magnetic gaps are formed between each central magnetic part and the side magnetic parts and the common magnetic part which are located on the two sides of the central magnetic part, and the two magnetic gaps are arranged side by side; the vibration system comprises a vibrating diaphragm assembly and two voice coils, the two voice coils are arranged side by side, one end of each voice coil is connected to the vibrating diaphragm assembly, and the other ends of the voice coils are located in the two magnetic gaps respectively; the common magnetic part is U-shaped, and magnetic poles at two free ends are oppositely arranged; 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 the electromagnetic radiation interference on the whole electronic equipment is relatively small, 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 particularly 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 in the acoustic device.

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

[0006] A magnetic circuit system, comprising a magnetic yoke and a common magnetic part, a central magnetic part and a side magnetic part arranged on the magnetic yoke, wherein the central magnetic part comprises two and is arranged on both sides of the common magnetic part, the side magnetic part comprises two and is arranged on both sides of the two central magnetic parts, a magnetic gap is formed between each central magnetic part and the side magnetic parts and the common magnetic part located on both sides thereof, and the two magnetic gaps are arranged side by side;

[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, and one end of the two voice coils is connected to the diaphragm assembly, and the other end is respectively located in two magnetic gaps; wherein,

[0008] The common magnetic part is formed in a U-shape, and the magnetic poles of the two free ends are arranged oppositely; and 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 side magnetic portion and the center magnetic portion are vertically magnetized and the magnetization directions of the side magnetic portion and the center magnetic portion that form the same magnetic gap are opposite, and the magnetic poles of the two free ends 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.

[0011] In a specific embodiment of the present invention, the common magnetic part includes a common magnet arranged in a U shape, 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.

[0012] In a specific embodiment of the present invention, the common magnetic part further comprises a common magnetic conductive plate disposed at two free ends of the U-shaped common magnet away from one side of the magnetic conductive yoke, and the common magnetic conductive plate and the central magnetic conductive plate are disposed opposite to each other.

[0013] In a specific embodiment of the present invention, the distance between the two free ends of the common magnetic part is not less than 1 mm;

[0014] And / or, surfaces of two free ends of the common magnetic portion close to the diaphragm assembly are not lower than the surface of the central magnetic portion close to the diaphragm assembly.

[0015] 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.

[0016] In a specific embodiment of the present invention, the diaphragm assembly includes an annular diaphragm and a vibration plate, and the diaphragm includes an outer fixing part, a folding ring part and an inner fixing part from the outside to the inside, the outer fixing part is connected to the shell, and the inner fixing part is connected to the vibration plate.

[0017] In a specific embodiment of the present invention, the folding ring portion includes a first folding ring and a second folding ring connected to the inner edge of the first folding ring, and the first folding ring and the second folding ring are recessed in opposite directions; and / or an annular protrusion facing the magnetic circuit system is formed on the vibration plate, and the voice coil is connected to the annular protrusion.

[0018] In a specific embodiment of the present invention, a plurality of centering supports are further included, one end of each of the centering supports is connected to the housing, and the other end is connected to at least one of the voice coils;

[0019] Wherein, the centering support plate includes a first centering support plate with two spot welding pads and a second centering support plate with four spot welding pads; the voice coil includes a first voice coil and a second voice coil, the outlet end of the first voice coil is connected to the spot welding pad of the first centering support plate, the inlet end of the first voice coil is connected to the spot welding pad of the second centering support plate, the inlet end of the second voice coil is connected to the spot welding pad of the first centering support plate, and the outlet end of the second voice coil is connected to the spot welding pad of the second centering support plate.

[0020] The present invention provides an electronic device, comprising any one of the acoustic devices described above.

[0021] 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 acoustic device is 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 turned on and vibrated can offset each other, thereby having smaller electromagnetic radiation, 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

[0022] 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.

[0023] Figure 1 is a three-dimensional structural diagram of an acoustic device in an embodiment of the present invention;

[0024] Figure 2 for Figure 1 The main view of

[0025] Figure 3 In one embodiment Figure 2 Sectional view of AA in the middle;

[0026] Figure 4 for Figure 3 Magnetic field direction diagram of the common magnetic part and its vicinity in the medium magnetic circuit system;

[0027] Figure 5 for Figure 3 An exploded view of the structure of the mesoacoustic device;

[0028] Figure 6 It is a three-dimensional structural diagram from another perspective of the acoustic device in the embodiment of the present invention.

[0029] 100-Acoustic device;

[0030] 10- housing;

[0031] 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;

[0032] 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

[0033] 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.

[0034] It should be understood that the terms used herein 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 herein 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] Reference Figures 1 to 6 According to a first aspect of an embodiment of the present invention, an acoustic device 100 is provided, including a magnetic circuit system 20 and a vibration system 30. The magnetic circuit system 20 includes a magnetic yoke 21 and a common magnetic part, a central magnetic part 23 and a side magnetic part 24 arranged on the magnetic yoke 21. The central magnetic part 23 includes two and is arranged on both sides of the common magnetic part. The side magnetic part 24 includes two and is arranged on both sides of the two central magnetic parts 23. A magnetic gap is formed between each central magnetic part 23 and the side magnetic parts 24 and the common magnetic part located on both sides thereof, and the two magnetic gaps are arranged side by side. The vibration system 30 includes 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, 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. The common magnetic part is formed in a U-shaped arrangement, and the magnetic poles of the free ends are arranged oppositely. The current direction of one voice coil 32 is clockwise, and the current direction of the other voice coil 32 is counterclockwise.

[0039] Specifically, the acoustic device 100 is formed as a substantially rectangular parallelepiped as a whole, with the length direction being the long axis, the width direction being the short axis, and the thickness direction being the vibration direction of the vibration system 30. Correspondingly, the magnetic circuit system 20 and the vibration system 30 also have a long axis and a short axis, and the long axis of the magnetic circuit system 20 and the vibration system 30 is arranged correspondingly to the long axis of the acoustic device 100, and the short axis of the magnetic circuit system 20 and the vibration system 30 is arranged correspondingly to the short axis of the acoustic device 100.

[0040] The magnetic circuit system 20 includes a magnetic yoke 21 and a common magnetic part, a central magnetic part 23 and a side magnetic part 24 arranged on the magnetic yoke 21. The common magnetic part, the central magnetic part 23 and the side magnetic part 24 are all in a strip shape, and the length direction extends along the long axis direction. 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 axis 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.

[0041] 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. The two voice coils 32 extend along the long axis direction and are arranged side by side along the short axis direction. 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.

[0042] Since there are two magnetic gaps and two voice coils 32 in the present embodiment, relative to the single voice coil 32 structure, the present 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 of the acoustic device 100. Correspondingly, when the thickness of the acoustic device 100 is reduced, the improvement brought about by the provision of two magnetic gaps and voice coils 32 can also offset the influence of the thickness reduction on the performance of the acoustic device 100, thereby ensuring the sound quality of the thin electronic device.

[0043] 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 vibrated can cancel each other, 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. The setting of the U-shaped common magnetic part can increase the magnetic induction intensity of the lateral component, further improving the magnetic field performance of the nuclear energy magnetic circuit system.

[0044] In one embodiment, the side magnetic part 24 and the center magnetic part 23 are both magnetized vertically, and the magnetic poles of the side magnetic part 24 and the center magnetic part 23 forming the same magnetic gap are arranged oppositely. The cross section of the common magnetic part is U-shaped, and the opening of the U-shaped structure is arranged toward the vibration system 30. The magnetic poles of the common magnetic part are respectively located at the two free ends of the U-shaped structure, and the two magnetic poles are arranged oppositely. At the same time, the magnetic poles of the two free ends of the common magnetic part are the same as the magnetic poles of the corresponding side center magnetic part 23 facing the magnetic guide yoke 21, so that the magnetization directions of the two center magnetic parts 23 are opposite, and the magnetization directions of the two side magnetic parts 24 are opposite.

[0045] Reference Figure 3 According to the direction of the horizontal arrow in the figure, the magnetization direction of the common magnetic part, the central magnetic part 23 and the side magnetic part 24 in the magnetic circuit system 20 is set, so that the directions of the forces generated by the two voice coils 32 and the magnetic field at the same time are the same, and the vibration directions of the two voice coils 32 at the same time are the same, so that the acoustic device 100 can make sounds normally.

[0046] 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.

[0047] In the magnetic circuit system 20 of this embodiment, since the common magnetic part is set as a U-shaped structure, the magnetic induction intensity of the lateral component can be further increased, and the magnetic field performance of the magnetic circuit system can be further improved. At the same time, while ensuring the function of the magnetic circuit system 20, the material cost of the common magnetic part is reduced, thereby reducing the cost of the acoustic device 100.

[0048] In one embodiment, the magnetic circuit system 20 further includes a magnetic yoke 21 , and the common magnetic portion, the central magnetic portion 23 and the side magnetic portion 24 are all arranged on the side of the magnetic yoke 21 facing the vibration system 30 .

[0049] Specifically, the magnetic yoke 21 is a substantially rectangular plate-shaped structure and is made of magnetic conductive material. The common magnetic portion, the central magnetic portion 23 and the side magnetic portion 24 are all arranged on the side of the magnetic yoke 21 facing the vibration system 30, thus forming two parallel magnetic gaps.

[0050] 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.

[0051] In one embodiment, the common magnetic part includes a common magnet 22 arranged in a U shape, the central magnetic part 23 includes a stacked central magnet 231 and a central magnetic conductive plate 232 , and the side magnetic part 24 includes a stacked side magnet 241 and a side magnetic conductive plate 242 .

[0052] 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 plates 242 facing the magnetic gap are roughly 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. The common magnetic part has only one U-shaped common magnet 22, the opening of which faces the vibration system 30, and the other side is bonded to the magnetic yoke 21.

[0053] In one embodiment, the common magnetic part includes a common magnet 22 arranged in a U shape and a common magnetic conductive plate arranged at two free ends of the common magnet 22 of the U shape away from the magnetic conductive yoke 21, the central magnetic part 23 includes a central magnet 231 and a central magnetic conductive plate 232 arranged in a stacked manner, the side magnetic part 24 includes a side magnet 241 and a side magnetic conductive plate 242 arranged in a stacked manner, and the common magnetic conductive plate and the central magnetic conductive plate 232 are arranged opposite to each other. The common magnetic conductive plate can further guide the magnetic flux lines to converge toward the magnetic gap to increase the magnetic field strength.

[0054] In one embodiment, the distance between the two free ends of the common magnetic part is not less than 1 mm. Exemplarily, the distance between the two intermediate magnetic parts is 1 mm, 1.05 mm, 1.1 mm, 1.15 mm, 1.2 mm, etc. This can reduce the mutual interference between the two magnetic poles of the two common magnets 22 to a certain extent, thereby increasing the magnetic field strength between the intermediate magnetic part and the central magnetic part 23.

[0055] In one embodiment, the surfaces of the two free ends of the common magnetic part close to the diaphragm assembly 31 are not lower than the surface of the central magnetic part 23 close to the diaphragm assembly 31. In this way, the magnetic induction intensity of the lateral component of the common magnetic part can be guaranteed. Further, in order to ensure the amplitude of the diaphragm assembly 31 when the thickness of the acoustic device 100 is constant, the surfaces of the two free ends of the common magnetic part close to the diaphragm assembly 31 are roughly flush with the surface of the central magnetic part 23 close to the diaphragm assembly 31.

[0056] In one embodiment, the height of the side magnetic portion 24 is smaller than the heights of the central magnetic portion 23 and the common magnetic portion.

[0057] For example, the height of the common magnetic part is equal to the height of the central magnetic part 23, and both are greater than the height of the side magnetic part 24, so that the reduced thickness of the side magnetic part 24 can be used to avoid the fold of the diaphragm assembly 31, and the amplitude of the diaphragm assembly 31 can be increased when the thickness of the acoustic device 100 is constant. In order to reduce the impact of the reduced thickness of the side magnetic part 24 on the magnetic field, the edge of the side magnetic conductive plate 242 facing the magnetic gap can be thickened.

[0058] Of course, in other embodiments, the thicknesses of the common magnetic portion, the central magnetic portion 23 and the edge magnetic portion 24 may be set to be equal.

[0059] In one embodiment, the width of the side magnetic portion 24 is smaller than the width of the central magnetic portion 23 and the common magnetic portion. This can further reduce the short axis length of the magnetic circuit system 20, thereby reducing the short axis length of the acoustic device 100, thereby freeing up more space for electronic equipment, which is beneficial to the spatial layout of electronic equipment.

[0060] 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 .

[0061] 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 along the short axis direction 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 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 improved. Of course, in order to improve the connection between the shell 10 and the magnetic circuit system 20, the second side 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.

[0062] 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 .

[0063] 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 .

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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 sides of the two short axis ends of the shell 10, and the two second connecting portions are respectively connected to the ends of the short axes corresponding to the first voice coil 321 and the second voice coil 322.

[0070] Meanwhile, two spot welding pads 333 are provided at the second connection portion of the first centering support plate 331 , and the two spot welding pads 333 are respectively connected to the outgoing lead of the first voice coil 321 and the incoming lead of the second voice coil 322 , so as to connect the first voice coil 321 and the second voice coil 322 in series.

[0071] 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.

[0072] The present invention 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 comprises the acoustic devices 100 in all the above-mentioned embodiments, it also has at least the beneficial effects of the above-mentioned embodiments, which will not be described in detail here.

[0073] The electronic device in this embodiment can be a mobile phone, a tablet, a computer, or a wearable device such as VR or AR.

[0074] 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, comprising a magnetic yoke and a common magnetic part, a central magnetic part and a side magnetic part arranged on the magnetic yoke, wherein the central magnetic part comprises two and is arranged on both sides of the common magnetic part, the side magnetic part comprises two and is arranged on both sides of the two central magnetic parts, a magnetic gap is formed between each central magnetic part and the side magnetic parts and the common magnetic part located on both sides thereof, and the two magnetic gaps are arranged side by side; 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, and one end of the two voice coils is connected to the diaphragm assembly, and the other end is respectively located in two magnetic gaps; wherein, The common magnetic part is formed in a U-shape, and the magnetic poles of the two free ends are arranged oppositely; and 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 side magnetic part and the center magnetic part are vertically magnetized and form the same magnetic gap, and the magnetization directions of the side magnetic part and the center magnetic part are opposite. The magnetic poles of the two free ends of the common magnetic part are the same as the magnetic poles of the center magnetic part on the corresponding side facing the magnetic yoke.

3. The acoustic device according to claim 1, characterized in that The common magnetic part includes a common magnet arranged in a U shape, the central magnetic part includes a central magnet and a central magnetic conductive plate arranged in a stacked manner, and the side magnetic part includes side magnets and side magnetic conductive plates arranged in a stacked manner.

4. The acoustic device according to claim 3, characterized in that The common magnetic part also includes a common magnetic conductive plate arranged at two free ends of the U-shaped common magnet away from the side of the magnetic conductive yoke, and the common magnetic conductive plate and the central magnetic conductive plate are arranged opposite to each other.

5. The acoustic device according to claim 1, characterized in that The distance between the two free ends of the common magnetic part is not less than 1 mm; And / or, surfaces of two free ends of the common magnetic portion close to the diaphragm assembly are not lower than the surface of the central magnetic portion close to the diaphragm assembly.

6. 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.

7. The acoustic device according to claim 6, characterized in that 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 shell, and the inner fixing portion is connected to the vibration plate.

8. The acoustic device according to claim 7, characterized in that The folding ring portion comprises a first folding ring and a second folding ring connected to the inner edge of the first folding ring, and the first folding ring and the second folding ring are recessed in opposite directions; and / or An annular protrusion facing the magnetic circuit system is formed on the vibration plate, and the voice coil is connected to the annular protrusion.

9. The acoustic device according to claim 6, characterized in that It also includes a plurality of centering supports, one end of each of the centering supports is connected to the housing, and the other end is connected to at least one of the voice coils; Wherein, the centering support plate includes a first centering support plate with two spot welding pads and a second centering support plate with four spot welding pads; the voice coil includes a first voice coil and a second voice coil, the outlet end of the first voice coil is connected to the spot welding pad of the first centering support plate, the inlet end of the first voice coil is connected to the spot welding pad of the second centering support plate, the inlet end of the second voice coil is connected to the spot welding pad of the first centering support plate, and the outlet end of the second voice coil is connected to the spot welding pad of the second centering support plate.

10. An electronic device, characterized in that: The acoustic device comprises any one of claims 1-9.

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