Sound production monomer and electronic equipment

Abstract

The invention belongs to the technical field of electro-acoustic conversion, and particularly relates to a sound production monomer and electronic equipment, the sound production monomer comprises a shell magnetic circuit system and a vibration system, and the magnetic circuit system comprises a first magnet, a second magnet and a third magnet which are arranged in a surrounding manner; the vibration system comprises a first vibrating diaphragm and a second vibrating diaphragm, the second vibrating diaphragm is annular, the second vibrating diaphragm comprises an inner folding ring, a central part surrounding the inner folding ring and an outer folding ring surrounding the central part, the outer folding ring is folded along the vibration direction, and at least part of the second voice coil is inserted into the second magnetic gap; the second magnet is provided with second magnetic steel and a magnetic conductive plate, the magnetic conductive plate is provided with fourth magnetic steel, the magnetizing directions of the second magnetic steel and the fourth magnetic steel are opposite, a vibration space is formed between the fourth magnetic steel and the second magnet, and the folding ring part of the first vibrating diaphragm and the inner folding ring of the second vibrating diaphragm are both connected to the fourth magnetic steel or the second magnet. Through the structure, the sound quality effect can be ensured under the condition that the thickness of the sound production monomer is reduced.

Description

Technical Field

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

[0002] In recent years, ultra-thin settings have become an increasingly popular trend in the development of electronic devices, and the thickness of the sound unit, as the sound-generating device of electronic devices, also needs to be further reduced. The sound effect of the sound unit is limited by the maximum linear displacement of the sound unit. Once the thickness of the sound unit is reduced, the maximum linear displacement of the sound unit will inevitably decrease. Therefore, how to ensure the sound quality effect when the thickness of the sound unit is reduced is a technical problem that needs to be solved urgently.

[0003] Therefore, 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 a sound unit and an electronic device, so as to ensure the sound quality effect when the thickness of the sound unit is reduced.

[0005] A first aspect of the present invention provides a sound-emitting unit.

[0006] Including magnetic circuit system and vibration system,

[0007] The magnetic circuit system includes a magnetic yoke and a first magnet, a second magnet and a third magnet arranged on the magnetic yoke, wherein the second magnet is arranged on the periphery of the first magnet and spaced apart from each other to form a first magnetic gap, and the third magnet is arranged on the periphery of the second magnet and spaced apart from each other to form a second magnetic gap;

[0008] The vibration system includes a first vibration unit and a second vibration unit which are coaxially arranged and radiate to the same side, the second vibration unit surrounds the outside of the first vibration unit, the first vibration unit includes a first diaphragm and a first voice coil connected to the first diaphragm, the first voice coil is at least partially inserted into the first magnetic gap; the second vibration unit includes a second diaphragm and a second voice coil connected to the second diaphragm, the second diaphragm is annular, the second diaphragm includes an inner folding ring, a central part surrounding the inner folding ring and an outer folding ring surrounding the central part, the outer folding ring is folded along the vibration direction, and the second voice coil is at least partially inserted into the second magnetic gap, wherein,

[0009] The second magnet includes a second magnetic steel fixed to the magnetic yoke and a second magnetic plate arranged on the side of the second magnetic steel away from the magnetic yoke; the magnetic circuit system also includes a fourth magnetic steel, the fourth magnetic steel is arranged on the side of the second magnet away from the magnetic yoke, the magnetization direction of the fourth magnetic steel is opposite to the magnetization direction of the second magnetic steel, a vibration space is formed between the two sides of the fourth magnetic steel and the top surface of the second magnet, the folding ring portion of the first diaphragm and the inner folding ring of the second diaphragm are both connected to the fourth magnetic steel or the second magnet and are at least partially located in the vibration space.

[0010] The sound-emitting unit provided by the present invention may also have the following additional technical features:

[0011] In a specific embodiment of the present invention, in a first working state, the first vibration unit and the second vibration unit radiate sound waves of the same phase outwardly, and in a second working state, the first vibration unit and the second vibration unit radiate sound waves of opposite phases outwardly.

[0012] In a specific embodiment of the present invention, the first magnet includes a first magnetic steel fixed to the magnetic yoke and a first magnetic conductive plate provided on a side of the first magnetic steel away from the magnetic yoke;

[0013] The third magnet comprises a third magnetic steel fixed to the magnetic yoke and a third magnetic conductive plate arranged on a side of the third magnetic steel away from the magnetic yoke;

[0014] The magnetization directions of the first magnetic steel, the second magnetic steel and the third magnetic steel are all parallel to the vibration direction. The magnetization direction of the first magnetic steel is opposite to the magnetization direction of the second magnetic steel and is the same as the magnetization direction of the third magnetic steel.

[0015] In a specific embodiment of the present invention, the folded ring portion is integrally connected to the inner folded ring.

[0016] In a specific embodiment of the present invention, the folded ring portion and the inner folded ring are both connected to the fourth magnetic steel, and both have a protrusion facing the direction of the magnetic yoke, and the two protrusions extend into the vibration space.

[0017] In a specific embodiment of the present invention, the folded ring portion and the inner folded ring are both folded along the vibration direction, and both extend in the vibration space and are connected to the second magnetic conductive plate.

[0018] In a specific embodiment of the present invention, both the first diaphragm and the second diaphragm are conductive diaphragms; and / or

[0019] The first diaphragm further includes a first vibration plate, the second diaphragm further includes a second vibration plate, and an area ratio of the first vibration plate to the second vibration plate is S, wherein 0.1≤S≤10; and / or

[0020] A ratio of a length of the first voice coil to a length of the second voice coil is a, a ratio of a width of the first voice coil to a width of the second voice coil is b, and a ratio of a height of the first voice coil to a height of the second voice coil is c, wherein 0.1≤a≤10, 0.1≤b≤10, and 0.1≤c≤10.

[0021] In a specific embodiment of the present invention, the folding ring portion is connected to the inner folding ring via a middle portion, and the middle portion is connected to the fourth magnetic steel.

[0022] In a specific embodiment of the present invention, a housing is further included, and the third magnetic conductive plate and the housing are an integral injection-molded structure. A second aspect of the present invention also provides an electronic device, comprising any of the above-mentioned sound-emitting units.

[0023] The sound-emitting unit provided in the embodiment of the present invention is provided with a shell, a magnetic circuit system, and a vibration system, so that the magnetic circuit system can drive the vibration system to vibrate and generate sound. At the same time, by providing a first magnetic gap and a second magnetic gap in the magnetic circuit system, and providing a corresponding first vibration unit and a second vibration unit in the vibration system, the low-frequency and high-frequency performance of the sound-emitting unit can be further improved. In addition, by providing the outer folding ring of the second diaphragm in the second vibration unit so that it can be folded along the vibration direction, the radiation area of ​​the second diaphragm can be increased, and thus the sound quality effect can be ensured when the thickness of the sound-emitting unit is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] 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.

[0025] Figure 1 It is a three-dimensional structural diagram of a sound-emitting unit in one embodiment of the present invention;

[0026] Figure 2 for Figure 1 Exploded view of the middle sound unit;

[0027] Figure 3 for Figure 1 A cross-sectional view of the middle sounding unit;

[0028] Figure 4 It is a cross-sectional view of a sound-emitting unit in another embodiment of the present invention.

[0029] Description of reference numerals:

[0030] 100-sound unit;

[0031] 10- housing;

[0032] 20-magnetic circuit system, 21-magnetic yoke, 22-first magnet, 221-first magnetic steel, 222-first magnetic plate, 23-second magnet, 231-second magnetic steel, 232-second magnetic plate, 24-third magnet, 241-third magnetic steel, 242-third magnetic plate, 25-fourth magnetic steel;

[0033] 30-vibration system, 31-first vibration unit, 311-first vibration plate, 312-first voice coil, 313-folding ring part, 32-second vibration unit, 321-second diaphragm, 322-second voice coil, 323-outer folding ring, 324-inner folding ring, 325-second vibration plate, 326-middle part. DETAILED DESCRIPTION

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] Reference Figure 1-4 As shown, the first aspect of the present invention provides a sound unit 100, which can ensure the sound quality effect of the sound unit 100 while reducing the thickness.

[0039] Specifically, the sound unit 100 provided by the embodiment of the present invention has a magnetic circuit system 20 and a vibration system 30, wherein the magnetic circuit system 20 includes a magnetic yoke 21 and a first magnet 22, a second magnet 23 and a third magnet 24 arranged on the magnetic yoke 21, wherein the second magnet 23 is arranged on the periphery of the first magnet 22 and is spaced apart from each other to form a first magnetic gap, and the third magnet 24 is arranged on the periphery of the second magnet 23 and is spaced apart from each other to form a second magnetic gap;

[0040] The vibration system 30 includes a first vibration unit 3131 and a second vibration unit 32 which are coaxially arranged and radiate to the same side, wherein the second vibration unit 32 surrounds the outside of the first vibration unit 31; wherein the first vibration unit 31 includes a first diaphragm and a first voice coil 312 connected to the first diaphragm, wherein the first voice coil 312 is at least partially inserted into the first magnetic gap; the second vibration unit 32 includes a second diaphragm 321 and a second voice coil 322 connected to the second diaphragm 321, wherein the second diaphragm 321 is annular, and the second diaphragm 321 includes an inner folding ring 324, a central portion surrounding the inner folding ring 324, and an outer folding ring 323 surrounding the central portion, wherein the outer folding ring 323 is folded along the vibration direction, and the second voice coil 322 is at least partially inserted into the first magnetic gap; 22 is at least partially inserted into the second magnetic gap; the second magnet 23 includes a second magnetic steel 231 fixed to the magnetic yoke 21 and a second magnetic plate 232 arranged on the side of the second magnetic steel 231 away from the magnetic yoke 21; the magnetic circuit system 20 also includes a fourth magnetic steel 25, the fourth magnetic steel 25 is arranged on the side of the second magnet 23 away from the magnetic yoke 21, the magnetization direction of the fourth magnetic steel 25 is opposite to the magnetization direction of the second magnetic steel 231, and a vibration space is formed between the two sides of the fourth magnetic steel 232 and the top surface of the second magnet 23, the folding ring portion 313 of the first diaphragm and the inner folding ring 324 of the second diaphragm 321 are both connected to the fourth magnetic steel 232 or the second magnet 23 and are at least partially located in the vibration space.

[0041] Specifically, the sound-emitting unit 100 of this embodiment is provided with a magnetic circuit system 20 and a vibration system 30 including a first vibration unit 31 and a second vibration unit 32. In this way, the first vibration unit 31 and the second vibration unit 32 can be driven by the magnetic circuit system 20 to vibrate and produce sound, thereby realizing the sound-emitting function of the sound-emitting unit 100. At the same time, since the vibration system 30 includes the first vibration unit 31 and the second vibration unit 32, the sound quality effect of the sound-emitting unit 100 can be further improved, thereby improving its low-frequency and high-frequency sound quality.

[0042] The first vibration unit 31 includes a first diaphragm and a first voice coil 312 connected to the first diaphragm, the first diaphragm is supported on the magnetic circuit system 20 through the folding ring portion 313, and the other end of the first voice coil 312 is plugged into the first magnetic gap, so that the magnetic circuit system 20 can drive the first vibration unit 31. The second vibration unit 32 includes a second diaphragm 321 and a second voice coil 322, wherein the second diaphragm 321 is arranged around the first diaphragm, and the central part of the second diaphragm 321 is supported on the magnetic circuit system 20 through the inner folding ring 324 and the outer folding ring 323, one end of the second voice coil 322 is connected to the central part, and the other end is plugged into the second magnetic gap, so that the magnetic circuit system 20 can drive the second vibration unit 32.

[0043] Since the outer folding ring 323 of the second diaphragm 321 is connected to the side of the central part and can be folded along the vibration direction, the radiation area of ​​the second diaphragm 321 can be increased, so that the sound quality effect can be guaranteed when the thickness of the sound unit 100 is reduced.

[0044] The magnetization direction of the fourth magnetic steel 25 is opposite to that of the second magnetic steel 231 , which can increase the BL value of the magnetic circuit system 20 , thereby further significantly improving the performance and sound effect of the whole machine.

[0045] A vibration space is formed between the fourth magnetic steel 25 and the top surface of the second magnet 23. The folding ring portion 313 of the first diaphragm and the inner folding ring 324 of the second diaphragm 321 are both connected to the fourth magnetic steel 232 or the second magnet 23 and are at least partially located in the vibration space, which is beneficial to reducing the product thickness.

[0046] It can be understood that the first vibration unit 31 and the second vibration unit 32 in the sound-emitting unit 100 are isolated from each other based on the folding ring portion 313 and the inner folding ring 324, and further separate the vibration front cavities of the first vibration unit 31 and the second vibration unit 32 from the housing of the electronic product. Similarly, the first vibration unit 31 and the second vibration unit 32 can vibrate and sound individually or in combination, which can be selected according to needs.

[0047] In one embodiment, the sound unit 100 has a first working state. At this time, the first vibration unit and the second vibration unit radiate sound waves of the same phase outward, and the two sound waves are superimposed and transmitted, which can enhance the loudness of the sound unit 100.

[0048] In another embodiment, the sound-emitting unit 100 has a second working state. At this time, the first vibration unit and the second vibration unit radiate sound waves with opposite phases outwardly, and the two sound waves cancel each other out, thereby avoiding sound leakage and effectively protecting privacy.

[0049] The sound-emitting monomer 100 provided in the embodiment of the present invention is provided with a housing 10, a magnetic circuit system 20, and a vibration system 30, so that the magnetic circuit system 20 can drive the vibration system 30 to vibrate and generate sound. At the same time, by providing a first magnetic gap and a second magnetic gap in the magnetic circuit system 20, and providing a corresponding first vibration unit 31 and a second vibration unit 32 in the vibration system 30, the low-frequency and high-frequency performance of the sound-emitting monomer 100 can be further improved. In addition, by providing the outer folding ring 323 of the second diaphragm 321 in the second vibration unit 32 to be foldable along the vibration direction, the radiation area of ​​the second diaphragm 321 can be increased, and thus the sound quality effect can be ensured when the thickness of the sound-emitting monomer 100 is reduced.

[0050] Specifically, the first magnet 22, the second magnet 23 and the third magnet 24 are all arranged on the side of the magnetic yoke 21 facing the vibration system 30, wherein the first magnet 22 is arranged in a bar shape, and the second magnet 23 is arranged in a ring shape and is sleeved on the outside of the first magnet 22, so that the gap between the first magnet 22 and the second magnet 23 forms a first magnetic gap; there are multiple third magnets 24, and they are all arranged in a bar shape, and multiple third magnets 24 are arranged around the outer periphery of the second magnet 23, so that a second magnetic gap is formed between the second magnet 23 and the third magnet 24, and the second magnetic gap is coaxial with the first magnetic gap and is arranged around the outside of the first magnetic gap.

[0051] In one embodiment, the first magnet 22 includes a first magnetic steel 221 fixed to the magnetic yoke 21 and a first magnetic plate 222 disposed on the side of the first magnetic steel 221 away from the magnetic yoke 21; the third magnet 24 includes a third magnetic steel 24 fixed to the magnetic yoke 21 and a third magnetic plate 242 disposed on the side of the third magnetic steel 24 away from the magnetic yoke 21; the magnetization directions of the first magnetic steel 221, the second magnetic steel 231, and the third magnetic steel 24 are all parallel to the vibration direction, and the magnetization direction of the first magnetic steel 221 is opposite to the magnetization direction of the second magnetic steel 231 and is the same as the magnetization direction of the third magnetic steel 24.

[0052] The first magnetic steel 221 has a substantially consistent profile with the first magnetic conductive plate 222, and the first magnetic steel 221 is bonded or welded to the magnetic conductive yoke 21 and the first magnetic conductive plate 222; the second magnetic steel 231 has a substantially consistent profile with the second magnetic conductive plate 232, and the second magnetic steel 231 is bonded or welded to the magnetic conductive yoke 21 and the second magnetic conductive plate 232; the third magnet 24 has a substantially consistent profile with the corresponding third magnetic conductive plate 242, and the third magnet 24 is bonded or welded to the magnetic conductive yoke 21 and the third magnetic conductive plate 242.

[0053] The fourth magnetic steel 25 The fourth magnetic steel 25 The fourth magnetic steel 25 can be optionally the folding ring portion 313 of the first diaphragm and the inner folding ring 324 of the second diaphragm 321, which is convenient for molding and assembly.

[0054] In one embodiment, if Figure 3 As shown, the folding ring 313 and the inner folding ring 324 are both connected to the fourth magnetic steel 25; and both have a protrusion facing the magnetic guide yoke 21, and the two protrusions extend into the vibration space. In this way, the first vibration unit 31 is connected to the magnetic circuit system 20, and the inner edge of the second vibration membrane 321 is connected to the magnetic circuit system 20; the protrusion faces the magnetic guide yoke 21, which fully utilizes the vibration space and is conducive to the thinness of the product.

[0055] Preferably, the folding ring portion 313 is connected to the inner folding ring 324 through the middle portion 326, and the middle portion 326 is connected to the fourth magnetic steel 25. Specifically, the middle portion 326 is arranged in a ring shape, and the inner edge is connected to the outer periphery of the folding ring portion 313, and the outer edge is connected to the inner folding ring 324, so that the first diaphragm and the second diaphragm 321 are connected as a whole, which is convenient for processing. Since the middle portion 326 is adaptively connected to the fourth magnetic steel 25, the first diaphragm and the second diaphragm 321 can not interfere with each other.

[0056] In one embodiment, if Figure 4 As shown, the folding ring portion 313 and the inner folding ring 324 are both folded along the vibration direction and extend in the vibration space and are connected to the second magnetic conductive plate 232. Since the inner folding ring 324 and the outer folding ring 323 are both foldable, this can not only improve the vibration stability of the second vibration unit 32, but also increase the radiation area of ​​the second diaphragm 321, thereby improving the sound quality of the second vibration unit 32. Since the folding ring portion 313 is foldable, this can increase the radiation area of ​​the first diaphragm, thereby improving the sound quality of the first vibration unit 31. The improvement of the sound quality effect of the first vibration unit 31 and the second vibration unit 32 can further ensure the sound quality effect of the sound-emitting unit 100 when the thickness is reduced.

[0057] In one embodiment, the first diaphragm and the second diaphragm 321 are conductive diaphragms, that is, conductive paths are provided on the first diaphragm and the second diaphragm 321, and the first voice coil 312 and the second voice coil 322 are electrically connected to the external circuit through the conductive paths. In this way, the magnetic circuit system does not need to be provided with an avoidance structure, which can further improve the BL value of the sound unit 100, thereby further significantly improving the performance and sound effect of the whole machine.

[0058] In one embodiment, the housing 10 is further included, and the third magnetic conductive plate 242 and the housing 10 are integrally formed by injection molding, so that the housing 10 and the vibration system 30 can be connected.

[0059] In one embodiment, the ratio of the length of the first voice coil 312 to the length of the second voice coil 322 is a, the ratio of the width of the first voice coil 312 to the width of the second voice coil 322 is b, and the ratio of the height of the first voice coil 312 to the height of the second voice coil 322 is c, wherein 0.1≤a≤10, 0.1≤b≤10, and 0.1≤c≤10. Similarly, the setting of the above ratio range facilitates the adjustment of the sound quality of the sound unit 100 so that it has a better treble effect or bass effect.

[0060] In one embodiment, the first vibration unit 31 further includes a first vibration plate 311, which is connected to the side of the first diaphragm away from the first coil, and the second vibration unit 32 further includes a second vibration plate 325, which is annular and connected to the central part. In this way, the strength of the first diaphragm and the second diaphragm 321 can be improved by the first vibration plate 311 and the second vibration plate 325, thereby improving the vibration stability of the first vibration unit 31 and the second vibration unit 32.

[0061] In one embodiment, the area ratio of the first vibration plate 311 to the second vibration plate 325 is S, where 0.1≤S≤10. The above ratio range is set to facilitate the adjustment of the sound quality of the sound unit 100 to make it have a better treble effect or bass effect.

[0062] The second aspect of the present invention further provides an electronic device, comprising any one of the above-mentioned sound-emitting monomers 100. The specific structure of the sound-emitting monomer 100 refers to the above-mentioned embodiment. Since the electronic device in this embodiment has the sound-emitting monomers 100 of all the above-mentioned embodiments, it has at least all the beneficial effects of the above-mentioned sound-emitting monomers 100, which will not be described one by one here.

[0063] 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. A sound-emitting unit, characterized in that: Including magnetic circuit system and vibration system, The magnetic circuit system includes a magnetic yoke and a first magnet, a second magnet and a third magnet arranged on the magnetic yoke, wherein the second magnet is arranged on the periphery of the first magnet and spaced apart from each other to form a first magnetic gap, and the third magnet is arranged on the periphery of the second magnet and spaced apart from each other to form a second magnetic gap; The vibration system includes a first vibration unit and a second vibration unit which are coaxially arranged and radiate to the same side, the second vibration unit surrounds the outside of the first vibration unit, the first vibration unit includes a first diaphragm and a first voice coil connected to the first diaphragm, the first voice coil is at least partially inserted into the first magnetic gap; the second vibration unit includes a second diaphragm and a second voice coil connected to the second diaphragm, the second diaphragm is annular, the second diaphragm includes an inner folding ring, a central part surrounding the inner folding ring and an outer folding ring surrounding the central part, the outer folding ring is folded along the vibration direction, and the second voice coil is at least partially inserted into the second magnetic gap, wherein, The second magnet includes a second magnetic steel fixed to the magnetic yoke and a second magnetic plate arranged on the side of the second magnetic steel away from the magnetic yoke; the magnetic circuit system also includes a fourth magnetic steel, the fourth magnetic steel is arranged on the side of the second magnet away from the magnetic yoke, the magnetization direction of the fourth magnetic steel is opposite to the magnetization direction of the second magnetic steel, a vibration space is formed between the two sides of the fourth magnetic steel and the top surface of the second magnet, the folding ring portion of the first diaphragm and the inner folding ring of the second diaphragm are both connected to the fourth magnetic steel or the second magnet and are at least partially located in the vibration space.

2. The sound-emitting unit according to claim 1, characterized in that: In the first working state, the first vibration unit and the second vibration unit radiate sound waves of the same phase to the outside, and in the second working state, the first vibration unit and the second vibration unit radiate sound waves of opposite phases to the outside.

3. The sound-emitting unit according to claim 2, characterized in that: The first magnet includes a first magnetic steel fixed to the magnetic yoke and a first magnetic plate provided on a side of the first magnetic steel away from the magnetic yoke; The third magnet comprises a third magnetic steel fixed to the magnetic yoke and a third magnetic conductive plate arranged on a side of the third magnetic steel away from the magnetic yoke; The magnetization directions of the first magnetic steel, the second magnetic steel and the third magnetic steel are all parallel to the vibration direction. The magnetization direction of the first magnetic steel is opposite to the magnetization direction of the second magnetic steel and is the same as the magnetization direction of the third magnetic steel.

4. The sound-emitting unit according to claim 3, characterized in that: The folding ring portion is integrally connected with the inner folding ring.

5. The sound-emitting unit according to claim 4, characterized in that: The folding ring portion and the inner folding ring are both connected to the fourth magnetic steel, and both have a protrusion facing the direction of the magnetic yoke, and the two protrusions extend into the vibration space.

6. The sound-emitting unit according to claim 3, characterized in that: The folding ring portion and the inner folding ring are both folded along the vibration direction, and both extend in the vibration space and are connected to the second magnetic conductive plate.

7. The sound-emitting unit according to claim 1, characterized in that: The first diaphragm and the second diaphragm are both conductive diaphragms; and / or The first diaphragm further includes a first vibration plate, the second diaphragm further includes a second vibration plate, and an area ratio of the first vibration plate to the second vibration plate is S, wherein 0.1≤S≤10; and / or A ratio of a length of the first voice coil to a length of the second voice coil is a, a ratio of a width of the first voice coil to a width of the second voice coil is b, and a ratio of a height of the first voice coil to a height of the second voice coil is c, wherein 0.1≤a≤10, 0.1≤b≤10, and 0.1≤c≤10.

8. The sound-emitting unit according to claim 5, characterized in that: The folding ring portion is connected to the inner folding ring via a middle portion, and the middle portion is connected to the fourth magnetic steel.

9. The sound-emitting unit according to claim 3, characterized in that: It also includes a shell, and the third magnetic conductive plate and the shell are an integral injection molding structure.

10. An electronic device, characterized in that: It comprises the sound-emitting unit as described in any one of claims 1 to 9.

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