Sound production unit and electronic equipment

Abstract

The utility model provides a sounding unit and an electronic device, and relates to the technical field of sound energy conversion, the sounding unit comprises a magnet assembly, a first vibration system and a second vibration system, the first vibration system comprises a first diaphragm and a first plane voice coil which are connected with each other; the second vibration system comprises a second vibrating diaphragm and a second planar voice coil which are connected with each other, and the first vibration system and the second vibration system are located on the two opposite sides of the magnet assembly respectively; the sound production unit comprises a first working state, and in the first working state, the first vibration system and the second vibration system radiate sound waves with opposite phases outwards. According to the sound production unit, the height of the sound production unit can be effectively reduced, the miniaturization design requirement of a loudspeaker is met, and the application range of the loudspeaker is widened; in addition, the sound production unit can be applied to the electronic equipment with call privacy, and a better low-leakage effect is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of sound energy conversion, and particularly to a sound generating unit and an electronic device. Background Art

[0002] In recent years, with the rapid development of the intelligent terminal electronics field, various electronic devices (such as mobile phones, earphones, tablet computers, etc.) have gradually shown new trends such as miniaturization, thinness, and intelligence. Consumers' requirements for speakers in electronic devices are also getting higher and higher, and miniaturized, high-performance, and high-quality speakers have gradually become the mainstream demand.

[0003] Currently, following the development direction of miniaturization and high performance of speakers, the structure of conventional speakers is usually too large in size and cannot meet the new requirement of reducing the thickness of the whole machine at present.

[0004] In view of this, it is necessary to provide a new sound generating unit and an electronic device to solve or at least alleviate the above technical defects. Summary of the Utility Model

[0005] The main purpose of the utility model is to provide a sound generating unit and an electronic device, aiming to solve the technical problem of the too large thickness of the speaker in the prior art.

[0006] To achieve the above object, according to one aspect of the utility model, the utility model provides a sound generating unit, including:

[0007] A magnet assembly;

[0008] A first vibration system, the first vibration system includes a first diaphragm and a first planar voice coil connected to each other;

[0009] A second vibration system, the second vibration system includes a second diaphragm and a second planar voice coil connected to each other, and the first vibration system and the second vibration system are respectively located on opposite sides of the magnet assembly;

[0010] The sound generating unit includes a first working state, in the first working state, the first vibration system and the second vibration system radiate sound waves with opposite phases outward.

[0011] In some embodiments, the sound generating unit further includes a second working state, in the second working state, the first vibration system and the second vibration system radiate sound waves with the same phase outward.

[0012] In some embodiments, the first diaphragm and the second diaphragm are of the same size; or, the effective vibration areas of the first diaphragm and the second diaphragm are equal.

[0013] In some embodiments, the first diaphragm includes a first body and a first surround, the second diaphragm further includes a second body and a second surround, the first planar voice coil is connected to the first body, the first surround is convexly provided in the direction towards the second body, the second planar voice coil is connected to the second body, and the second surround is convexly provided in the direction towards the first body.

[0014] In some embodiments, a first conductive layer is provided on the first diaphragm, the first planar voice coil is electrically connected to the first conductive layer, a second conductive layer is provided on the second diaphragm, and the second planar voice coil is electrically connected to the second conductive layer.

[0015] In some embodiments, the first planar voice coil includes a plurality of first conductive lines stacked on the first diaphragm, the sound generating unit further includes a first annular bracket, a first pad is provided on the first annular bracket, and the first conductive layer electrically connects the first conductive line and the first pad;

[0016] and / or,

[0017] The second planar voice coil includes a plurality of second conductive lines stacked on the second diaphragm, the sound generating unit further includes a second annular bracket, and the second conductive layer electrically connects the second conductive line and the second pad.

[0018] In some embodiments, the first planar voice coil includes a plurality of first straight segments and a plurality of first connecting segments, the first straight segments and the first connecting segments are alternately connected in sequence to form a first S-shaped line; the second planar voice coil includes a plurality of second straight segments and a plurality of second connecting segments, the second straight segments and the second connecting segments are alternately connected in sequence to form a second S-shaped line; the magnet assembly includes a plurality of magnet pairs, on opposite sides of each magnet pair, there is respectively one first straight segment and one second straight segment corresponding thereto, the magnetic pole directions of the two magnets in each magnet pair are opposite, and the magnetic pole directions of the two magnets that are adjacent and close to each other in adjacent magnet pairs are the same.

[0019] In some embodiments, the first planar voice coil includes a plurality of stacked first composite structures, each first composite structure includes a first base material and the first S-shaped line provided on the first base material, and the first S-shaped lines are electrically connected; the second planar voice coil includes a plurality of stacked second composite structures, each second composite structure includes a second base material and the second S-shaped line provided on the second base material, and the second S-shaped lines are electrically connected.

[0020] In some embodiments, the first S-shaped line and the second S-shaped line are formed by winding a wire; or, the first S-shaped line and the second S-shaped line are formed by printing.

[0021] In some embodiments, the two magnets in each magnet pair are arranged in contact with each other; or,

[0022] the two magnets in each magnet pair are arranged at intervals; or,

[0023] the two magnets in each magnet pair have the same thickness; or,

[0024] the thicknesses of the magnet pairs are equal.

[0025] In some embodiments, two adjacent magnet pairs are arranged at intervals.

[0026] In some embodiments, for the two magnets in each magnet pair, the magnetic pole direction of one magnet points from the first diaphragm to the second diaphragm; the magnetic pole direction of the other magnet points from the second diaphragm to the first diaphragm.

[0027] In some embodiments, the first vibration system further includes a first dome, which is formed by stacking multiple layers of first conductive circuits on the first diaphragm; the second vibration system further includes a second dome, which is formed by stacking multiple layers of second conductive circuits on the second diaphragm.

[0028] In some embodiments, the first diaphragm is a planar diaphragm; and / or, the second diaphragm is a planar diaphragm.

[0029] In some embodiments, the sound generating unit further includes a housing, the magnet assembly is installed in the housing, the first vibration system is installed on the top surface of the housing, and the second vibration system is installed on the bottom surface of the housing.

[0030] In some embodiments, the housing includes an upper housing and a lower housing, convex portions are formed on the upper housing and the lower housing, and the magnet assembly is formed with recessed portions that cooperate with the convex portions; or,

[0031] recessed portions are formed on the upper housing and the lower housing, and the magnet assembly is formed with convex portions that cooperate with the recessed portions.

[0032] In some embodiments, the housing includes an upper housing, a lower housing, an upper fixing member and a lower fixing member, the upper fixing member is disposed on the upper housing, and the lower fixing member is disposed on the lower housing,

[0033] the upper fixing member and the lower fixing member are formed with convex portions, and the magnet assembly is formed with recessed portions that are snap-fitted with the convex portions; or,

[0034] the upper fixing member and the lower fixing member are formed with recessed portions, and the magnet assembly is formed with convex portions that are snap-fitted with the recessed portions.

[0035] In some embodiments, a first notch is formed on the upper housing, and a second notch is formed on the lower housing. The first notch and the second notch cooperate to form a sound leakage hole.

[0036] According to another aspect of the present invention, the present invention further provides an electronic device, and the electronic device includes the sound generating unit described above.

[0037] In the above solution, the sound generating unit includes a magnet assembly, a first vibration system, and a second vibration system. The first vibration system includes a first diaphragm and a first planar voice coil connected to each other; the second vibration system includes a second diaphragm and a second planar voice coil connected to each other. The first vibration system and the second vibration system are respectively located on opposite sides of the magnet assembly; the sound generating unit includes a first working state. In the first working state, the first vibration system and the second vibration system radiate sound waves with opposite phases outward. In the above solution of the present invention, it can not only effectively reduce the height of the sound generating unit, meet the miniaturization design requirements of the speaker, and improve the applicable range of the speaker; but also enable the sound generating unit to be applied to electronic devices with call privacy, achieving a better low-leakage effect; and the voice coil also functions as a dome at the same time, reducing the use of the dome while ensuring the sound generating performance of the sound generating unit, reducing the manufacturing difficulty, and also reducing the manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative efforts.

[0039] Figure 1 It is an exploded structural schematic diagram of the sound generating unit according to an embodiment of the present invention;

[0040] Figure 2 It is a structural schematic diagram of one perspective of the sound generating unit according to an embodiment of the present invention;

[0041] Figure 3 It is a structural schematic diagram of another perspective of the sound generating unit according to an embodiment of the present invention;

[0042] Figure 4 It is a partial structural schematic diagram of the sound generating unit according to an embodiment of the present invention;

[0043] Figure 5 It is a structural schematic diagram of the current directions of the first planar voice coil and the second planar voice coil of the sound generating unit according to an embodiment of the present invention;

[0044] Figure 6 Schematic diagram of the pole directions of multiple magnet pairs in an embodiment of the present utility model;

[0045] Figure 7 Schematic diagram of the first diaphragm and the second diaphragm of the sound generating unit in an embodiment of the present utility model being planar diaphragms;

[0046] Figure 8 Schematic diagram of the second conductive layer and the second diaphragm of the sound generating unit in an embodiment of the present utility model;

[0047] Figure 9 Schematic diagram of the first S-shaped circuit or the second S-shaped circuit of the sound generating unit in an embodiment of the present utility model;

[0048] Figure 10 Schematic diagram of the composition structure of the first planar voice coil or the second planar voice coil of the sound generating unit in an embodiment of the present utility model;

[0049] Figure 11 Schematic diagram of the housing and the magnet assembly of the sound generating unit in an embodiment of the present utility model;

[0050] Figure 12 Exploded schematic diagram of the housing and the magnet assembly of the sound generating unit in an embodiment of the present utility model;

[0051] Figure 13 Schematic diagram of the magnet assembly of the sound generating unit in an embodiment of the present utility model;

[0052] Figure 14 Schematic diagram of the composition structure of the magnet assembly of the sound generating unit in an embodiment of the present utility model;

[0053] Figure 15 Schematic diagram of the first magnet and the second magnet of the sound generating unit in an embodiment of the present utility model;

[0054] Figure 16 Schematic diagram of the magnet pair of the sound generating unit in an embodiment of the present utility model.

[0055] Label description:

[0056] 200, Sound generating unit; 1, Second conductive layer; 2, Magnet assembly; 21, Magnet pair; 211, Magnet; 212, First magnet; 213, Second magnet; 214, Groove; 215, Upper surface; 216, Lower surface; 3, First vibration system; 31, First diaphragm; 311, First body; 312, First surround; 32, First planar voice coil; 302, First composite structure; 320, First S-shaped circuit; 3201, First straight segment; 3202, First connecting segment; 321, First substrate; 4, Second vibration system; 41, Second diaphragm; 411, Second body; 412, Second surround; 42, Second planar voice coil; 402, Second composite structure; 420, Second S-shaped circuit; 4201, Second straight segment; 4202, Second connecting segment; 421, Second substrate; 5, Housing; 51, Upper housing; 511, First notch; 512, Upper convex portion; 52, Lower housing; 521, Second notch; 522, Lower convex portion; 54, Sound leakage hole.

[0057] The realization of the purpose, functional features and advantages of the present utility model will be further described in conjunction with the embodiments with reference to the accompanying drawings. Specific embodiments

[0058] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the protection scope of the present utility model.

[0059] It should be noted that all directional indications (such as up, down,...) in the embodiments of the present utility model are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0060] In addition, the descriptions such as "first" and "second" in the present utility model are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features.

[0061] Moreover, the technical solutions between the various embodiments of the present utility model can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement it. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0062] Traditional miniature speakers usually consist of a vibration system, a magnetic circuit system, and a support system. The vibration system includes a diaphragm, a dome, a voice coil, a centering washer, etc. The magnetic circuit system includes a yoke, a chassis, and several magnets. The support system includes a housing, a shrapnel, and other inserts, etc. Currently, following the development trend of miniaturization and high performance of speakers, conventional speakers can no longer improve performance by increasing the external dimensions to meet the needs of consumers. Moreover, the trend of miniaturization of electronic devices further compresses the space size of internal speakers, resulting in the inability to smoothly install existing speakers due to their large size. Especially for double-sided speakers, since they require two vibration systems, the height of the speaker is relatively large, greatly limiting the application scenarios of double-sided speakers.

[0063] For this reason, the present utility model provides a sound generating unit.

[0064] Referring to Figures 1 to 3 , according to one aspect of the present utility model, the present utility model provides a sound generating unit 200. The sound generating unit 200 includes a magnet assembly 2, a first vibration system 3, and a second vibration system 4. The first vibration system 3 includes a first diaphragm 31 and a first planar voice coil 32 that are connected to each other. The second vibration system 4 includes a second diaphragm 41 and a second planar voice coil 42 that are connected to each other. The first vibration system 3 and the second vibration system 4 are respectively located on opposite sides of the magnet assembly 2. The sound generating unit 200 includes a first working state. In the first working state, the first vibration system 3 and the second vibration system 4 radiate sound waves with opposite phases outward.

[0065] The magnet assembly 2 is disposed between the first vibration system 3 and the second vibration system 4. Specifically, the first vibration system 3 is disposed on the top surface of the magnet assembly 2, and the second vibration system 4 is disposed on the bottom surface of the magnet assembly 2. Both the first planar voice coil 32 and the second planar voice coil 42 are planar voice coils, which means that the circuit of the first planar voice coil 32 is wound or printed on a plane, or a voice coil with a very small thickness or a very small height is attached to the first diaphragm 31. The circuit of the second planar voice coil 42 is wound or printed on a plane, or a voice coil with a very small thickness or a very small height is attached to the second diaphragm 41, and both are disposed facing the magnet assembly 2. That is, the first planar voice coil 32 is located on the top surface of the magnet assembly 2, the second planar voice coil 42 is located on the bottom surface of the magnet assembly 2, and the first planar voice coil 32 and the second planar voice coil 42 are spaced apart from the magnet assembly 2. Compared with the voice coil of the annular structure used in the related art, the voice coil is wound around a central axis and disposed along the vertical direction, and then the voice coil is disposed in the magnetic gap, and the height of the voice coil is relatively large. Compared with the related art, the use of the planar voice coil in this embodiment can effectively reduce the height of the sound generating unit 200, meet the miniaturization design requirements of the speaker, and improve the application range of the speaker. Of course, in other embodiments, it may also be that the first vibration system 3 is disposed on the bottom surface of the magnet assembly 2, and the second vibration system 4 is disposed on the top surface of the magnet assembly 2.

[0066] In addition, it should be noted that the sound generating unit 200 of this embodiment includes two working states, namely the first working state and the second working state. In the first working state, by controlling the current flowing through the first planar voice coil 32 and the second planar voice coil 42, the first diaphragm 31 and the second diaphragm 41 can vibrate in the same direction. Furthermore, the first vibration system 3 and the second vibration system 4 radiate sound waves with opposite phases outward. The sound intensities of the sound waves with opposite phases cancel each other out and decrease after superposition, so that the sound generating unit 200 can be applied to electronic devices with call privacy to achieve a better low-leakage effect.

[0067] The applicant also wants to explain that the first planar voice coil 32 in the embodiment of the present invention is attached to the first diaphragm 31, and the second planar voice coil 42 is attached to the second diaphragm 41, and can also simultaneously play the role of a dome, improve the stiffness of the diaphragm, improve the mid-high frequency performance, and drive the air to generate sound. Thus, the planar voice coil can play two roles of the voice coil itself and the dome, can reduce the use of the dome while ensuring the sound generating performance of the sound generating unit 200, reduce the manufacturing difficulty, and also reduce the manufacturing cost.

[0068] In some embodiments, in the second working state, the first vibration system 3 and the second vibration system 4 radiate sound waves with the same phase outward. By controlling the current flowing through the first planar voice coil 32 and the second planar voice coil 42, the first diaphragm 31 and the second diaphragm 41 vibrate in opposite directions, so that the first diaphragm 31 and the second diaphragm 41 output sound waves with the same phase. The sound waves with the same phase can be superimposed and enhanced to achieve the function of enhanced external speaker.

[0069] Referring to Figure 1 , in some embodiments, the first diaphragm 31 and the second diaphragm 41 are of the same size; or, the effective vibration areas of the first diaphragm 31 and the second diaphragm 41 are equal.

[0070] It should be noted that the first diaphragm 31 and the second diaphragm 41 being of the same size may mean that they have the same shape and size, so that the vibration areas of the first diaphragm 31 and the second diaphragm 41 are the same. Similarly, the effective vibration areas of the first diaphragm 31 and the second diaphragm 41 are equal. The effective vibration area refers to the effective vibration area of the diaphragm during the vibration of the sound generating unit 200. The first diaphragm 31 and the second diaphragm 41 having the same size or the same effective vibration area can further reduce the leakage effect and improve the privacy of the call when the sound generating unit 200 is applied to an electronic device with call privacy. And it can also increase the general performance of the materials, that is, the first diaphragm 31 and the second diaphragm 41 use the same materials, reducing the stock preparation cost and also avoiding the situation of misassembling the diaphragm due to assembly mistakes.

[0071] Referring to Figure 4 and Figure 5 , in some embodiments, the first diaphragm 31 includes a first body 311 and a first surround 312, the second diaphragm 41 further includes a second body 411 and a second surround 412, the first planar voice coil 32 is connected to the first body 311, the first surround 312 protrudes towards the direction of the second body 411, the second planar voice coil 42 is connected to the second body 411, and the second surround 412 protrudes towards the direction of the first body 311.

[0072] The first folding ring 312 can be integrally formed with the first body 311, or the first folding ring 312 can also be made of a material with certain elasticity, which can play an elastic buffering role in the vibration process of the first diaphragm 31 and reduce the risk of rupture during the vibration of the first diaphragm 31. Similarly, the second folding ring 412 can be integrally formed with the second body 411, or the second folding ring 412 can also be made of a material with certain elasticity, which can play an elastic buffering role in the vibration process of the second diaphragm 41 and reduce the risk of rupture during the vibration of the second diaphragm 41. In addition, in the above embodiments, the first folding ring 312 is provided to protrude towards the second body 411, and the second folding ring 412 is provided to protrude towards the first body 311. Actually, the first folding ring 312 and the second folding ring 412 are both set in a concave shape, which can further reduce the size of the sound generating unit 200. In addition, the applicant also wants to explain that the magnetic circuit system of a traditional loudspeaker includes a central magnet 211 and an edge magnet 211, and the voice coil extends into the magnetic gap between the central magnet 211 and the edge magnet 211. Since installation spaces need to be provided for the edge magnet 211 and the voice coil, generally, it is not thought of setting the folding ring to be recessed inward, because that will inevitably increase the height required for the loudspeaker, which is contrary to the effect that those skilled in the art want to achieve. In fact, the technical solutions adopted in the prior art often set the folding ring to protrude outward, that is, in the opposite direction of the protrusion direction of this embodiment.

[0073] In some embodiments, a first conductive layer is provided on the first diaphragm 31, and the first planar voice coil 32 is electrically connected to the first conductive layer. A second conductive layer is provided on the second diaphragm 41, and the second planar voice coil 42 is electrically connected to the second conductive layer.

[0074] Since the first planar voice coil 32 is attached to the first diaphragm 31 and the second planar voice coil 42 is attached to the second diaphragm 41, in order to electrically connect the first planar voice coil 32 and the second planar voice coil 42 to the outside, conductive glue can be coated on the first planar voice coil 32 and the first diaphragm 31 to form the first conductive layer; conductive glue is coated on the second planar voice coil 42 and the second diaphragm 41 to form the second conductive layer, so that the first planar voice coil 32 and the second planar voice coil 42 can be electrically connected to the outside, facilitating the energization of the first planar voice coil 32 and the second planar voice coil 42 during use.

[0075] Refer to Figure 4 and Figure 13, in some embodiments, the two magnets 211 in each magnet pair 21 are arranged in contact with each other; alternatively, the two magnets 211 in each magnet pair 21 are arranged at intervals; alternatively, the two magnets 211 in each magnet pair 21 have the same thickness; or, the magnet pairs 21 have the same thickness. Two juxtaposed magnets 211 may be provided in each magnet pair 21. The two magnets 211 may be arranged in contact with each other and have the same length, so that the generated magnetic field is more concentrated and the magnetic field strength is greater. Of course, the two magnets 211 may also be arranged at intervals, so that the acting range of the generated magnetic field is larger and can act on a larger range of coils. As for the thicknesses of the two magnets 211, they may be the same or different. Setting them to the same thickness has a higher space utilization rate and is beneficial to improving the versatility of the material. The thicknesses of the magnet pairs 21 may be equal or unequal. Setting them to be equal is also for improving the space utilization rate. At the same time, setting the magnet pairs 21 to be the same is also convenient for installation and realizes the versatility of the material.

[0076] Referring to Figure 4 , in some embodiments, adjacent magnet pairs 21 are arranged at intervals. The adjacent magnet pairs 21 are arranged at intervals because, in the ideal design state, one magnet pair 21 controls the vibration of a corresponding first straight segment 3201 and a second straight segment 4201. To avoid interference caused by the magnet pairs 21 being arranged in close contact or too close to each other, the adjacent magnet pairs 21 can be arranged at intervals by a small distance, and this distance can be set according to the actual situation.

[0077] Referring to Figure 6 (a), in some embodiments, for the two magnets 211 in each magnet pair 21, the magnetic pole direction of one magnet 211 points from the first diaphragm 31 to the second diaphragm 41; the magnetic pole direction of the other magnet 211 points from the second diaphragm 41 to the first diaphragm 31. Regarding the directions of the two magnets 211 in each magnet pair 21, there can be various design forms. Please refer to Figure 6In (a), the magnetic pole direction of one magnet 211 can be from the first diaphragm 31 to the second diaphragm 41, and the magnetic pole direction of the other magnet 211 can be from the second diaphragm 41 to the first diaphragm 31. That is, one is from the bottom surface to the top surface, and the other is from the top surface to the bottom surface, or one is from top to bottom, and the other is from bottom to top, or the bottom surface of one magnet 211 is the N pole and the top surface is the S pole, while the bottom surface of the other magnet 211 is the S pole and the top surface is the N pole. The magnetic field generated in this way has circular magnetic induction lines. The first planar voice coil 32 and the second planar voice coil 42 are in a magnetic field of basically the same intensity, and the forces on the first planar voice coil 32 and the second planar voice coil are basically the same. That is to say, the vibration intensities of the first diaphragm 31 and the second diaphragm 41 are basically the same, and double-sided vibration can be achieved. At the same time, the tangent direction of the magnetic induction lines at the first planar voice coil 32 and the second planar voice coil 42 is the horizontal direction, so that the Ampere forces on the first planar voice coil 32 and the second planar voice coil are in the vertical direction, including the vertically upward and vertically downward directions, causing the first diaphragm 31 and the second diaphragm 41 to vibrate in the vertical direction at the first planar voice coil 32 and the second planar voice coil. It should be noted that the magnetic pole direction here can also be expressed as the magnetization direction. When the first diaphragm 31 and the second diaphragm 41 vibrate in the same direction, the first vibration system 3 and the second vibration system 4 radiate sound waves with opposite phases outward. The sound intensities of the sound waves with opposite phases cancel each other out and decrease after superposition, so that the sound generating unit 200 can be applied to electronic devices with call privacy to achieve a better low-leakage effect.

[0078] Of course, in some other embodiments, it can also be that the magnetic pole direction of one magnet 211 is set vertically, and the magnetic pole direction of the other magnet 211 is set horizontally. Please refer to Figure 6 In (b), the magnetic pole direction of one magnet 211 in a pair of magnets 21 is vertically upward, and the magnetic pole direction of the other magnet 211 is horizontally to the left. For the adjacent pair of magnets 21, the magnetic pole direction of one magnet 211 is horizontally to the right, and the magnetic pole direction of the other magnet 211 is vertically upward. Moreover, the magnets 211 horizontally to the left and horizontally to the right are arranged adjacent to each other with a certain interval therebetween. In addition, please refer to Figure 6(c), the magnetic pole direction of one magnet 211 in a magnet pair 21 is horizontally to the right, and the magnetic pole direction of the other magnet 211 is vertically upward. For the adjacent magnet pair 21, the magnetic pole direction of one magnet 211 is vertically upward, and the magnetic pole direction of the other magnet 211 is horizontally to the left. The two vertically upward magnets 211 are arranged adjacent to each other with a certain interval therebetween. In this embodiment, it can be seen from the direction of the magnetic induction lines that the first diaphragm 31 located on the top surface is subjected to a greater magnetic field force, which is applicable to the application scenario of a single-sided diaphragm with the diaphragm located on the top surface. Of course, it can also be applicable to the application scenario of a double-sided diaphragm with a greater sound emission intensity on the top surface than on the bottom surface. Of course, the magnetic pole direction in the vertical direction can also be set, which is applicable to the application scenario of a single-sided diaphragm with the diaphragm located on the bottom surface. Of course, it can also be applicable to the application scenario of a double-sided diaphragm with a greater sound emission intensity on the bottom surface than on the top surface.

[0079] In some embodiments, the first planar voice coil 32 includes multiple layers of first conductive lines stacked on the first diaphragm 31. The sound generating unit 200 further includes a first annular bracket, and a first solder pad is provided on the first annular bracket. The first conductive layer electrically connects the first conductive line and the first solder pad.

[0080] The first solder pad can be integrally provided on the first annular bracket during the injection molding of the first annular bracket. The first planar voice coil 32 can include one layer of first conductive lines or multiple layers of first conductive lines. The first conductive layer electrically connects the first conductive line and the first solder pad to achieve electrical connection between the first planar voice coil 32 and the outside.

[0081] In some embodiments, the second planar voice coil 42 includes multiple layers of second conductive lines stacked on the second diaphragm 41. The sound generating unit 200 further includes a second annular bracket, and a second conductive layer electrically connects the second conductive line and the second solder pad. The second solder pad can be integrally provided on the second annular bracket during the injection molding of the second annular bracket. The second planar voice coil 42 can include one layer of second conductive lines or multiple layers of second conductive lines. The second conductive layer electrically connects the second conductive line and the second solder pad to achieve electrical connection between the second planar voice coil 42 and the outside.

[0082] Refer to Figure 9, in some embodiments, the first planar voice coil 32 includes a plurality of first straight segments 3201 and a plurality of first connecting segments 3202. The first straight segments 3201 and the first connecting segments 3202 are alternately connected in sequence to form a first S-shaped circuit 320. The second planar voice coil 42 includes a plurality of second straight segments 4201 and a plurality of second connecting segments 4202. The second straight segments 4201 and the second connecting segments 4202 are alternately connected in sequence to form a second S-shaped circuit 420. The magnet assembly 2 includes a plurality of magnet pairs 21. On opposite sides of each magnet pair 21, there corresponds a first straight segment 3201 and a second straight segment 4201 respectively. The magnetic pole directions of the two magnets 211 in each magnet pair 21 are opposite, and the magnetic pole directions of the two mutually adjacent magnets 211 in adjacent magnet pairs 21 are the same.

[0083] Referring to Figure 4 and Figure 13 , the magnet assembly 2 is composed of a plurality of magnet pairs 21. Specifically, the magnet pairs 21 are arranged in one direction to form a planar magnet assembly 2. Each magnet pair 21 may include two magnets 211. The magnets 211 may be strip-shaped magnets, and the extending direction of the strip-shaped magnets is the same as the extending direction of the first straight segment 3201 or the second straight segment 4201. In this way, both the first straight segment 3201 and the second straight segment 4201 are in the magnetic field formed by the magnet pair 21. The first straight segment 3201 is the driving edge of the first planar voice coil 32, and the second straight segment 4201 is the driving edge of the second planar voice coil 42. When an electric current is applied to the first planar voice coil 32 and the second planar voice coil 42, according to Ampere's law, the energized coil will be acted upon by an Ampere force in the magnetic field, so that the first planar voice coil 32 and the second planar voice coil 42 vibrate, and then drive the first diaphragm 31 and the second diaphragm 41 to vibrate respectively. Here, the magnetic pole directions of the two magnets 211 in each magnet pair 21 are set to be opposite, which can form a magnetic field with circular magnetic induction lines, driving the first planar voice coil 32 and the second planar voice coil 42 to be stressed in the vertical direction and vibrate up and down. Setting two magnets 211 in one magnet pair 21 can make the formed magnetic field more uniform, and at the same time can make the tangent direction of the magnetic induction line at the positions of the first straight segment 3201 and the second straight segment 4201 be along the horizontal direction, so that the direction of the Ampere force received by the first straight segment 3201 and the second straight segment 4201 is in the vertical upward or vertical downward direction.

[0084] In some embodiments, the current directions of the two first straight segments 3201 connected to both ends of each first connecting segment 3202 are opposite, and the current directions of the two second straight segments 4201 connected to both ends of each second connecting segment 4202 are opposite. The feature of the first S-shaped line 320 is that the current directions of two adjacent first straight segments 3201 are opposite. In order to make the directions of the Ampere forces received by the same S-shaped line the same, the directions of the two magnetic fields of the first straight segment 3201 are set to be opposite, so as to ensure that the force directions of each first straight segment 3201 of the same S-shaped line at the same moment are the same, and make the vibration directions of each position of the first diaphragm 31 at the same moment the same. Similarly, the feature of the second S-shaped line 420 is that the current directions of two adjacent second straight segments 4201 are opposite. In order to make the directions of the Ampere forces received by the same second S-shaped line the same, the directions of the two magnetic fields of the second straight segment 4201 are set to be opposite, so as to ensure that the vibration directions of the second diaphragm 41 at the same moment are the same.

[0085] In some embodiments, the first S-shaped line 320 includes a plurality of first sub-lines arranged at intervals in parallel, and the current directions of the lines in the same first straight segment 3201 of each first sub-line are the same; the second S-shaped line 420 includes a plurality of second sub-lines arranged at intervals in parallel, and the current directions of the lines in the same second straight segment 4201 of each second sub-line are the same. The first connecting segment 3202 and the second connecting segment 4202 are both semi-circular connecting segments. The purpose of arranging a plurality of first sub-lines is to increase the force received by the first planar voice coil 32, and thus increase the vibration intensity of the first diaphragm 31. Similarly, arranging a plurality of second sub-lines is also to increase the force received by the second planar voice coil 42, and thus increase the vibration intensity of the second diaphragm 41. In order to make the current directions of the adjacent first straight segments 3201 of each first sub-line or second sub-line opposite, the first connecting segment 3202 can be set as semi-circular. When the current flows through the previous first straight segment 3201 and then through the first connecting segment 3202, it can just achieve a 180-degree turn of the current direction when reaching the next first straight segment 3201. Similarly, in order to make the current directions of the adjacent second straight segments 4201 opposite, the second connecting segment 4202 can be set as semi-circular. When the current flows through the previous second straight segment 4201 and then through the second connecting segment 4202, it can just achieve a 180-degree turn of the current direction when reaching the next second straight segment 4201. Of course, the first connecting segment 3202 and the second connecting segment 4202 can also adopt other shapes, as long as the form that can achieve the current direction turn is within the protection scope of the present utility model.

[0086] Refer to Figure 10, in some embodiments, the first planar voice coil 32 includes multiple stacked first composite structures 302. Each first composite structure 302 includes a first substrate 321 and a first S-shaped circuit 320 disposed on the first substrate 321, and the first S-shaped circuits 320 are electrically connected to each other; the second planar voice coil 42 includes multiple stacked second composite structures 402. Each second composite structure 402 includes a second substrate 421 and a second S-shaped circuit 420 disposed on the second substrate 421, and the second S-shaped circuits 420 are electrically connected to each other. The first planar voice coil 32 is not a single layer, but is formed by stacking multiple first composite structures 302. Each first composite structure 302 includes a first substrate 321 and a first S-shaped circuit 320 disposed on the first substrate 321, that is, the first planar voice coil 32 is formed by the interleaved stacking of the first substrate 321 and the first S-shaped circuit 320. The first S-shaped circuits 320 are connected to each stack layer in parallel or in series to form the first planar voice coil 32 with the required resistance value or wire length; those skilled in the art can select the number of layers of the first composite structure 302 and the electrical connection method of each first S-shaped circuit 320 according to requirements such as resistance value and wire length, that is, select series connection, parallel connection, or partial series connection and partial parallel connection. Similarly, the second planar voice coil 42 is not a single layer, but is formed by stacking multiple second composite structures 402. Each second composite structure 402 includes a second substrate 421 and a second S-shaped circuit 420 disposed on the second substrate 421, that is, the second planar voice coil 42 is formed by the interleaved stacking of the second substrate 421 and the second S-shaped circuit 420. The second S-shaped circuits 420 are connected to each stack layer in parallel or in series to form the second planar voice coil 42 with the required resistance value and wire length. Those skilled in the art can select the number of layers of the first composite structure 302 and the electrical connection method of each second S-shaped circuit 420 according to requirements such as resistance value and wire length, that is, select series connection, parallel connection, or partial series connection and partial parallel connection.

[0087] In some embodiments, the first S-shaped circuit 320 and the second S-shaped circuit 420 are formed by winding a wire; or, the first S-shaped circuit 320 and the second S-shaped circuit 420 are formed by printing. Regarding the manufacturing method of the first S-shaped circuit 320 and the second S-shaped circuit 420, it can be formed by arranging a coil according to the direction of the S-shaped route, or can be printed on the diaphragm by a printing method.

[0088] In some embodiments, the first vibration system 3 further includes a first dome, and the first dome is formed by stacking multiple first conductive circuits on the first diaphragm 31; the second vibration system 4 further includes a second dome, and the second dome is formed by stacking multiple second conductive circuits on the second diaphragm 41. As described above, the first planar voice coil 32 and the second planar voice coil 42 can function as domes, but domes can also be additionally provided on the first diaphragm 31 and the second diaphragm 41 to improve the sound generation performance of the first vibration system 3 and the second vibration system 4.

[0089] Referring to Figure 7 , in some embodiments, the first diaphragm 31 is a planar diaphragm; and / or, the second diaphragm 41 is a planar diaphragm. The manufacturing process of the planar diaphragm is simpler, and due to its lightweight and planar characteristics, the planar diaphragm has a better response to high-frequency signals. This enables it to better restore the high-pitched part, making the music more penetrating and clear. Moreover, the planar diaphragm allows the sound generating unit to be designed with a thinner and lighter appearance, which meets the pursuit of thinness and lightness in modern devices.

[0090] Referring to Figure 2 , Figure 3 and Figure 11 , in some embodiments, the sound generating unit 200 further includes a housing 5, the magnet assembly 2 is installed in the housing 5, the first vibration system 3 is installed on the top surface of the housing 5, and the second vibration system 4 is installed on the bottom surface of the housing 5. Generally, a cavity is formed inside the housing 5, the magnet assembly 2 is installed in the cavity, and upper mounting holes and lower mounting holes are further formed on the housing 5. The first diaphragm 31 is installed on the upper mounting holes, and the second diaphragm 41 is installed on the lower mounting holes. Of course, in some other embodiments, it may also be that the first vibration system 3 is installed on the bottom surface of the housing 5, and the second vibration system 4 is installed on the top surface of the housing 5.

[0091] Referring to Figure 11 and Figure 12 , in some embodiments, a first notch 511 is formed on the upper housing 51, a second notch 521 is formed on the lower housing 52, and the first notch 511 and the second notch 521 cooperate to form a sound leakage hole 54. The first notch 511 is formed on one side of the upper housing 51 facing the lower housing 52, and the second notch 521 is formed on the lower housing 52 facing the upper housing 51 and corresponding to the position of the first notch 511. The number of the first notch 511 and the second notch 521 can be multiple. After the upper housing 51 and the lower housing 52 are assembled, the first notch 511 and the second notch 521 cooperate to form the sound leakage hole 54 for relieving pressure on the sound generating unit 200.

[0092] Referring to Figure 12, in some embodiments, the housing 5 includes an upper housing 51 and a lower housing 52. Protrusions are formed on the upper housing 51 and the lower housing 52, and the magnet assembly 2 is formed with recesses that cooperate with the protrusions; alternatively, recesses are formed on the upper housing 51 and the lower housing 52, and the magnet assembly 2 is formed with protrusions that cooperate with the recesses. Recesses or protrusions can be formed on the magnet assembly 2, and protrusions or recesses that cooperate with the magnet assembly 2 are formed on the upper housing 51 and the lower housing 52, so that the magnet assembly 2 is snap - connected to the housing 5, making both installation and disassembly relatively convenient. As for the assembly method of the magnet assembly 2, each magnet pair 21 can be separately assembled with the housing 5 to form the magnet assembly 2, or the magnet assembly 2 connected as a whole by glue or other structural members can be assembled with the housing 5 together.

[0093] In some embodiments, the housing 5 includes an upper housing 51, a lower housing 52, an upper fixing member and a lower fixing member. The upper fixing member is disposed on the upper housing 51, the lower fixing member is disposed on the lower housing 52. The upper fixing member and the lower fixing member are formed with protrusions, and the magnet assembly 2 is formed with recesses that are snap - connected and cooperate with the protrusions; alternatively, the upper fixing member and the lower fixing member are formed with recesses, and the magnet assembly 2 is formed with protrusions that are snap - connected and cooperate with the recesses. Upper fixing members and lower fixing members for snap - connection can also be additionally provided on the upper housing 51 and the lower housing 52. The upper fixing member and the lower fixing member are respectively provided with recesses or protrusions that cooperate with the magnet assembly 2 for snap - connection with the magnet assembly 2. The upper fixing member and the lower fixing member can be metal parts.

[0094] Refer to 11, Figures 14 to 16 , in some embodiments, each magnet pair 21 includes a first magnet 212 and a second magnet 213. The recess of the magnet assembly 2 includes a groove 214. The upper surface 215 at one end of the first magnet 212 has the groove 214, and the lower surface 216 at the same end of the second magnet 213 has the groove 214; the lower surface 216 at the other end of the first magnet 212 has the groove 214, and the upper surface 215 at the other end of the second magnet 213 has the groove 214. The housing has a protrusion that is complementary to the groove 214. That is, for the two grooves 214 of the first magnet 212 and the second magnet 213 at the same end, one groove 214 is on the upper surface 215, and the other groove 214 is on the lower surface 216, and the two grooves 214 are vertically offset. And grooves 214 are provided at both ends of the first magnet 212, and grooves 214 are provided at both ends of the second magnet 213. Therefore, there are two grooves 214 at both ends of the magnet pair 21, and the grooves 214 at each end are offset. The housing 5 has a protrusion that is complementary to the groove 214. By the offset arrangement, the snap - connection positions are in different planes, which can further improve the firmness of the snap - connection.

[0095] Refer to Figure 13, in some embodiments, the positions of the grooves 214 of two adjacent magnets in two adjacent magnet pairs 21 are the same. There are multiple magnet pairs 21, and the multiple magnet pairs 21 are arranged in a row. The positions of the grooves 214 of the two magnets 211 in two adjacent magnet pairs 21 are the same, that is, the grooves 214 of the two magnets 211 in two adjacent magnet pairs 21 are both located on the upper surface 215, or the grooves 214 of the two magnets 211 in two adjacent magnet pairs 21 are both located on the lower surface 216. The spliced grooves 214 with the same position can form a large recessed groove, so that only one protruding part can be designed to be clamped and matched with the two grooves 214 at the same time, which can simplify the number of protruding parts on the housing 5 and reduce the process complexity.

[0096] Referring to Figure 12 , in some embodiments, the housing 5 includes a detachable upper housing 51 and a lower housing 52. The protruding part includes an upper protruding part 512 and a lower protruding part 522. The upper housing 51 is provided with a plurality of spaced upper protruding parts 512, and the lower housing 52 is provided with a plurality of spaced lower protruding parts 522. Along the width direction of the upper housing 51, the upper protruding parts 512 and the lower protruding parts 522 are staggered, and along the direction perpendicular to the upper housing 51, the upper protruding parts 512 and the lower protruding parts 522 are offset.

[0097] It should be noted that the length direction of the upper housing 51 is as Figure 12 shown by the arrow A in Figure 12 , the arrangement direction of the magnet pairs 21 is as Figure 12 shown by the arrow B in

[0098] Combined with reference to Figure 12 and Figure 13, in some embodiments, the grooves 214 on the upper surfaces 215 of the first magnet 212 and the second magnet 213 abut against the bottom surface of the upper convex portion 512, and the grooves 214 on the lower surfaces 216 of the first magnet 212 and the second magnet 213 abut against the top surface of the lower convex portion 522 to limit the magnet pair 21 in the vertical direction. We define the plane where the upper housing 51 is located as the XY plane, and the direction perpendicular to the upper housing 51 is the Z direction, that is, the vertical direction. The upper convex portion 512 and the lower convex portion 522 respectively extend into the corresponding grooves 214. Due to the limiting effect of the side walls of the grooves 214, the magnet pair 21 can be limited and positioned in the XY direction or in the XY plane. This embodiment also sets the grooves 214 on the upper surfaces 215 of the first magnet 212 and the second magnet 213 to abut against the bottom surface of the upper convex portion 512, which can prevent the first magnet 212 and the second magnet 213 from moving upward. Setting the grooves 214 on the lower surfaces 216 of the first magnet 212 and the second magnet 213 to abut against the top surface of the lower convex portion 522 can prevent the first magnet 212 and the second magnet 213 from moving downward. In this way, the limiting of the magnet pair 21 in the Z direction is also achieved, thereby realizing the limiting of the magnet pair 21 in the three directions of XYZ and further improving the firmness of the clamping connection.

[0099] Referring to Figure 12 and Figure 13 , in some embodiments, the grooves 214 at the same end of adjacent magnets of adjacent magnet pairs 21 abut against the same convex portion. The adjacent magnets can be two adjacent first magnets 212 or two adjacent second magnets 213. The positions of the grooves 214 of the adjacent two magnets of adjacent two magnet pairs 21 are the same. At this time, the grooves 214 at the same end can all be the grooves 214 on the upper surface or all be the grooves 214 on the lower surface. When the groove 214 is the groove 214 on the upper surface, the groove 214 at the same end abuts against the bottom surface of the upper convex portion 512. When the groove 214 is the groove 214 on the lower surface, the groove 214 at the same end abuts against the bottom surface of the lower convex portion 522 to achieve vertical limiting. In addition, the two grooves 214 at the same end abut against the same convex portion, which can not only simplify the structural design of the convex portions on the housing 5, but also reduce the abutting position points, or the limiting position points, facilitating the installation of the magnet assembly 2.

[0100] In some embodiments, at least one of the upper convex portions 512 is clamped with at least one corresponding groove 214, and at least one of the lower convex portions 522 is clamped with at least one corresponding groove 214. Generally, the upper convex portion 512 located at the middle position cooperates with two grooves 214 simultaneously, and the lower convex portion 522 located at the middle position also cooperates with two grooves 214 simultaneously. The groove 214 that cooperates with the upper convex portions 512 located on both sides may be one or two, and the groove 214 that cooperates with the lower convex portions 522 located on both sides may be one or two. In this way, only one upper convex portion 512 or one lower convex portion 522 needs to be designed to be clamped and cooperate with two grooves 214 simultaneously, which can simplify the number of protruding portions of the housing 5 and reduce the process complexity. Refer to Figure 12 , in some embodiments, the housing 5 includes an upper housing 51 and a lower housing 52. Protruding portions are formed on the upper housing 51 and the lower housing 52, and a recessed portion that cooperates with the protruding portion is formed on the magnet assembly 2; alternatively, recessed portions are formed on the upper housing 51 and the lower housing 52, and a protruding portion that cooperates with the recessed portion is formed on the magnet assembly 2. A recessed portion or a protruding portion can be formed on the magnet assembly 2, and a protruding portion or a recessed portion that cooperates with the magnet assembly 2 is formed on the upper housing 51 and the lower housing 52, so that the magnet assembly 2 is clamped on the housing 5, and in this way, both installation and disassembly are relatively convenient. As for the assembly method of the magnet assembly 2, each magnet pair 21 can be separately assembled with the housing 5 to form the magnet assembly 2, or the magnet assembly 2 that is connected into one body by glue or other structural members can be assembled with the housing 5 together.

[0101] In some embodiments, the housing 5 includes an upper housing 51, a lower housing 52, an upper fixing member and a lower fixing member. The upper fixing member is arranged on the upper housing 51, and the lower fixing member is arranged on the lower housing 52. Protruding portions are formed on the upper fixing member and the lower fixing member, and a recessed portion that is clamped and cooperates with the protruding portion is formed on the magnet assembly 2; alternatively, recessed portions are formed on the upper fixing member and the lower fixing member, and a protruding portion that is clamped and cooperates with the recessed portion is formed on the magnet assembly 2. Additionally, an upper fixing member and a lower fixing member for clamping can be further arranged on the upper housing 51 and the lower housing 52. The upper fixing member and the lower fixing member are respectively provided with a recessed portion or a protruding portion that cooperates with the magnet assembly 2 for clamping with the magnet assembly 2. The upper fixing member and the lower fixing member can be metal parts.

[0102] In some embodiments, the convex portion includes a first protruding end 214 and a first protruding end 215 respectively disposed at two ends of the magnet pair 21. The concave portion includes a first clamping groove corresponding to the first protruding end 214 and a second clamping groove corresponding to the first protruding end 215. The magnet pair 21 may include two bar magnets 211. The convex portion includes a first protruding end 214 and a first protruding end 215 respectively located at two ends of the bar magnet 211. The concave portion includes a first clamping groove and a second clamping groove. The first protruding end 214 is adapted to abut or engage with the first clamping groove, and the first protruding end 215 is adapted to abut or engage with the second clamping groove, so as to realize the cooperation between the convex portion and the concave portion, so that the magnet pair 21 can be clamped to the housing 5. The installation of the magnet pair 21 is realized through the clamping cooperation at two positions.

[0103] Referring to Figures 12 to 16 , in some embodiments, the housing 5 includes an upper housing 51 and a lower housing 52 which are detachably connected. The first clamping groove includes a first sub-groove 512 and a second sub-groove 522. The second clamping groove includes a third sub-groove 513 and a fourth sub-groove 523. A first sub-groove 512 is formed on one side of the upper housing 51, and a third sub-groove 513 is formed on the other side of the upper housing 51. A second sub-groove 522 is formed on one side of the lower housing 52, and a fourth sub-groove 523 is formed on the other side of the lower housing 52. The first protruding end 214 includes a first sub-end 2121 adapted to cooperate with the first sub-groove 512 and a second sub-end 2131 adapted to cooperate with the second sub-groove 522. The first protruding end 215 includes a third sub-end 2122 adapted to cooperate with the third sub-groove 513 and a fourth sub-end 2132 adapted to cooperate with the fourth sub-groove 523.

[0104] The first clamping groove includes two sub-grooves, namely a first sub-groove 512 and a second sub-groove 522. The second clamping groove includes two sub-grooves, namely a third sub-groove 513 and a fourth sub-groove 523. The first sub-groove 512 and the third sub-groove 513 are provided on the upper housing 51 and are respectively provided on both sides of the upper housing 51 along the length direction. The length direction of the upper housing 51 is as Figure 12As shown by arrow A, the second sub-slot 522 and the fourth sub-slot 523 are provided on the lower housing 52, and are respectively provided on both sides of the lower housing 52 along the length direction. The first sub-slot 512 and the second sub-slot 522 are correspondingly arranged, and the third sub-slot 513 and the fourth sub-slot 523 are correspondingly arranged. The first protruding end 214 includes two sub-ends, namely the first sub-end 2121 and the second sub-end 2131. The first protruding end 215 includes two sub-ends, namely the third sub-end 2122 and the fourth sub-end 2132. The first sub-end 2121 cooperates with the first sub-slot 512, the second sub-end 2131 cooperates with the second sub-slot 522, the third sub-end 2122 cooperates with the third sub-slot 513, and the fourth sub-end 2132 cooperates with the fourth sub-slot 523. In this embodiment, the installation of the magnet pair 21 on the housing 5 is realized through the snap-fit at four positions, and the installation is more firm and the fitting accuracy is higher. It should be noted here that each sub-end, specifically referring to the first sub-end 2121, the second sub-end 2131, the third sub-end 2122, and the fourth sub-end 2132, extends from the body of the magnet 211 to form a section. Therefore, it can also be said that there are recessed positions formed on the magnet 211.

[0105] In some embodiments, one or two first sub-ends 2121 are provided in one first sub-slot 512, one or two second sub-ends 2131 are provided in one second sub-slot 522, one or two third sub-ends 2122 are provided in one third sub-slot 513, and one or two fourth sub-ends 2132 are provided in one fourth sub-slot 523. Whether one or two first sub-ends 2121 are provided in one first sub-slot 512 depends on the actual situation. Generally speaking, the first sub-slots 512 located on both sides may be snap-fitted with only one first sub-end 2121, or may be snap-fitted with two first sub-ends 2121, while the first sub-slots 512 located in the middle are snap-fitted with two first sub-ends 2121. These two first sub-ends 2121 come from two adjacent magnet pairs 21, and each magnet pair 21 contributes one first sub-end 2121, and the two first sub-ends 2121 are arranged adjacent to each other. Of course, the first sub-slot 512 will also be set to different sizes according to the number of first sub-ends 2121 snap-fitted. Similarly, one or two second sub-ends 2131 are provided in one second sub-slot 522, one or two third sub-ends 2122 are provided in one third sub-slot 513, and one or two fourth sub-ends 2132 are provided in one fourth sub-slot 523. The specific situation is similar to the form of the first sub-slot 512 and the first sub-end 2121, and will not be elaborated here.

[0106] Refer to Figure 12, in some embodiments, in the width direction of the upper housing 51, the first sub-groove 512 and the third sub-groove 513 are arranged in a staggered manner, and the second sub-groove 522 and the fourth sub-groove 523 are arranged in a staggered manner; in the direction perpendicular to the upper housing 51, the first sub-groove 512 and the second sub-groove 522 are arranged in a staggered manner, and the third sub-groove 513 and the fourth sub-groove 523 are arranged in a staggered manner. The width direction of the upper housing 51 is as shown by the arrow B in Figure 12 , and the direction perpendicular to the housing 5 is as shown by the arrow C in Figure 12 . It should be noted that the upper housing 51 and the lower housing 52 are covered with each other. The length direction of the upper housing 51 is the same as the width direction of the lower housing 52, the width direction of the upper housing 51 is the same as the width direction of the lower housing 52, and the direction perpendicular to the upper housing 51 will also be perpendicular to the lower housing 52 at the same time. Arranging the first sub-groove 512 and the third sub-groove 513 in a staggered manner can enable the first sub-end 2121 and the third sub-end 2122 to be clamped and limited on different planes. Arranging the second sub-groove 522 and the fourth sub-groove 523 in a staggered manner can enable the second sub-end 2131 and the fourth sub-end 2132 to be clamped and limited on different planes, improving the firmness of the clamping.

[0107] In some embodiments, the housing 5 is further provided with a first abutting end and a second abutting end. The first abutting end abuts against the first protruding end 214, and the second abutting end abuts against the first protruding end 215 to limit the magnet pair 21 in the vertical direction. We define the plane where the upper housing 51 is located as the XY plane, and the direction perpendicular to the upper housing 51 is the Z direction, that is, the vertical direction. The first sub-groove 512, the second sub-groove 522, the third sub-groove 513 and the fourth sub-groove 523 all limit and position the magnet pair 21 in the XY direction. The first abutting end and the second abutting end limit the magnet pair 21 in the direction perpendicular to the housing 5, that is, the vertical direction, namely the Z direction, thereby realizing the limitation of the magnet pair 21 in the three directions of XYZ and further improving the firmness of the clamping.

[0108] Referring to Figure 11 and Figure 12 , in some specific embodiments, the first abutting end includes a first abutting plate 514 and a second abutting plate 524, the second abutting end includes a third abutting plate 515 and a fourth abutting plate 525. The first abutting plate 514 and the first sub-groove 512 are arranged alternately, the second abutting plate 524 and the second sub-groove 522 are arranged alternately, the third abutting plate 515 and the third sub-groove 513 are arranged alternately, and the fourth abutting plate 525 and the fourth sub-groove 523 are arranged alternately; the bottom surface of the first sub-end 2121 abuts against the second abutting plate 524, the top surface of the second sub-end 2131 abuts against the first abutting plate 514, the top surface of the third sub-end 2122 abuts against the third abutting plate 515, and the bottom surface of the fourth sub-end 2132 abuts against the fourth abutting plate 525.

[0109] Referring toFigure 12 , the first sub-slot 512 can be considered to be formed by partial depression of the upper housing 51. The depressed part forms the first sub-slot 512, and the non-depressed part forms the first abutting plate 514. The first abutting plate 514 and the first sub-slot 512 are arranged alternately. Similarly, the second sub-slot 522 can be considered to be formed by partial depression of the lower housing 52. The depressed part forms the second sub-slot 522, and the non-depressed part forms the second abutting plate 524. The third sub-slot 513 can be considered to be formed by partial depression of the upper housing 51. The depressed part forms the third sub-slot 513, and the non-depressed part forms the third abutting plate 515. The fourth sub-slot 523 can be considered to be formed by partial depression of the lower housing 52. The depressed part forms the fourth sub-slot 523, and the non-depressed part forms the fourth abutting plate 525.

[0110] Specifically, referring to Figure 11 and Figure 12 , the bottom surface of the first sub-end 2121 abuts against the top surface of the second abutting plate 524 to prevent the magnet 211 from moving downward. The top surface of the second sub-end 2131 abuts against the bottom surface of the first abutting plate 514 to prevent the magnet 211 from moving upward; thus, the limitation in the vertical direction, that is, the up and down two directions, is achieved. The top surface of the third sub-end 2122 abuts against the bottom surface of the third abutting plate 515 to prevent the magnet 211 from moving upward; the bottom surface of the fourth sub-end 2132 abuts against the fourth abutting plate 525 to prevent the magnet 211 from moving downward, thus achieving the limitation in the vertical direction, that is, the up and down two directions. In this way, the vertical limitation of the magnet pair 21 is realized from four positions.

[0111] Referring to Figure 15 and Figure 16 , in some embodiments, the two magnets 211 of the magnet pair 21 are respectively a first magnet 212 and a second magnet 213. The first magnet 212 is formed with a first sub-end 2121 and a third sub-end 2122, and the second magnet 213 is formed with a second sub-end 2131 and a fourth sub-end 2132. The magnet 211 is a bar magnet 211. The first sub-end 2121 and the third sub-end 2122 are formed at the two end portions of the first magnet 212, and the second sub-end 2131 and the fourth sub-end 2132 are formed at the two end portions of the second magnet 213.

[0112] Referring to Figure 15 and Figure 16, in some embodiments, the first magnet 212 and the second magnet 213 have the same structure but different arrangement directions, and the second magnet 213 is obtained by rotating the first magnet 212. Specifically, the second magnet 213 can be obtained by rotating the first magnet 212 by 180 degrees, and the rotation plane is the XY plane. After the first magnet 212 and the second magnet 213 are assembled, staggered protruding ends are formed, which normalizes the magnet 211 material into a single common material and simplifies the assembly method of the magnet assembly 2 and the housing 5, reducing the overall cost of the solution while ensuring performance and quality.

[0113] Referring to Figure 15 and Figure 16 , in some embodiments, the first magnet 212 and the second magnet 213 have the same structure but different arrangement directions, and the second magnet 213 is obtained by rotating the first magnet 212. Specifically, the second magnet 213 can be obtained by rotating the first magnet 212 by 180 degrees, specifically by rotating around the central axis of the first magnet 212 by 180 degrees. After the first magnet 212 and the second magnet 213 are assembled, staggered protruding ends are formed, which normalizes the magnet 211 material into a single common material and simplifies the assembly method of the magnet assembly 2 and the housing 5, reducing the overall cost of the solution while ensuring performance and quality.

[0114] In some embodiments, a first pad is formed on the upper housing 51, and a second pad is formed on the lower housing 52. The first diaphragm 31 is electrically connected to the first pad through the first conductive layer; the second diaphragm 41 is electrically connected to the second pad through the second conductive layer 1. Referring to Figure 8 , a second conductive layer 1 is provided on the second diaphragm 41. The first diaphragm 31 can be directly mounted on the upper housing 51, and the second diaphragm 41 can be directly mounted on the lower housing 52. A first conductive coating electrically connected to the first planar voice coil 32 is provided on the first diaphragm 31, and the first conductive coating is electrically connected to the first pad through the first conductive layer. A second conductive coating electrically connected to the second planar voice coil 42 is provided on the second diaphragm 41, and the second conductive coating is electrically connected to the second pad through the second conductive layer 1. It should be noted that writing the first conductive coating and the first conductive layer, and the second conductive coating and the second conductive layer 1 here is for convenience of description. In fact, they can be a single conductive layer formed together when applying conductive glue.

[0115] According to another aspect of the present invention, the present invention also provides an electronic device, and the electronic device includes the above-mentioned sound generating unit 200. The sound generating unit 200 can be a speaker or a part of a speaker. The electronic device can be a smart wearable electronic device, such as an earphone, a bracelet, a watch or a ring, or can also be a mobile phone, a computer or a tablet computer, etc. Since the electronic device includes all the technical solutions of all embodiments of the above-mentioned sound generating unit 200, therefore, it has at least all the beneficial effects brought by the above-mentioned all technical solutions, and will not be elaborated one by one here.

[0116] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and do not limit the patent scope of the present utility model. Although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that under the technical concept of the present utility model, it is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features therein; or directly / indirectly apply them in other related technical fields, and 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 various embodiments of the present application, and they should all be covered by the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A sound unit, characterized in that: include: Magnet assembly; A first vibration system, the first vibration system comprising a first diaphragm and a first planar voice coil connected to each other; a second vibration system, the second vibration system comprising a second diaphragm and a second planar voice coil connected to each other, the first vibration system and the second vibration system being located at opposite sides of the magnet assembly; The sound-emitting unit includes a first working state, in which the first vibration system and the second vibration system radiate sound waves with opposite phases outwardly.

2. The sound generating unit according to claim 1, characterized in that: The sound-emitting unit further includes a second working state, in which the first vibration system and the second vibration system radiate sound waves of the same phase outwardly.

3. The sound generating unit according to claim 1, characterized in that: The first diaphragm and the second diaphragm are of the same size; or, the effective vibration area of ​​the first diaphragm and the effective vibration area of ​​the second diaphragm are equal.

4. The sound generating unit according to claim 1, characterized in that: The first diaphragm includes a first body and a first fold ring, the second diaphragm also includes a second body and a second fold ring, the first planar voice coil is connected to the first body, the first fold ring is protruded toward the direction of the second body, and the second planar voice coil is connected to the second body, and the second fold ring is protruded toward the direction of the first body.

5. The sound generating unit according to claim 1, characterized in that: A first conductive layer is disposed on the first diaphragm, and the first planar voice coil is electrically connected to the first conductive layer. A second conductive layer is disposed on the second diaphragm, and the second planar voice coil is electrically connected to the second conductive layer.

6. The sound generating unit according to claim 5, characterized in that: The first planar voice coil includes a first conductive circuit stacked on the first diaphragm in multiple layers, the sound-generating unit also includes a first annular bracket, a first pad is disposed on the first annular bracket, and the first conductive layer electrically connects the first conductive circuit and the first pad; and / or, The second planar voice coil includes a second conductive circuit stacked in multiple layers on the second diaphragm. The sound-emitting unit also includes a second annular bracket, on which a second soldering pad is disposed. The second conductive layer electrically connects the second conductive circuit and the second soldering pad.

7. The sound generating unit according to claim 1, characterized in that: The first planar voice coil includes a plurality of first straight line segments and a plurality of first connecting segments, the first straight line segments and the first connecting segments are alternately connected in sequence to form a first S-shaped circuit; the second planar voice coil includes a plurality of second straight line segments and a plurality of second connecting segments, the second straight line segments and the second connecting segments are alternately connected in sequence to form a second S-shaped circuit; the magnet assembly includes a plurality of magnet pairs, the opposite sides of each magnet pair correspond to one first straight line segment and one second straight line segment respectively, the magnetic poles of the two magnets in each magnet pair are in opposite directions, and the magnetic poles of the two magnets close to each other in adjacent magnet pairs are in the same direction.

8. The sound generating unit according to claim 7, characterized in that: The first planar voice coil includes a first composite structure stacked in multiple layers, each of the first composite structures includes a first substrate and the first S-shaped circuit arranged on the first substrate, and the first S-shaped circuits are electrically connected; the second planar voice coil includes a second composite structure stacked in multiple layers, each of the second composite structures includes a second substrate and the second S-shaped circuit arranged on the second substrate, and the second S-shaped circuits are electrically connected.

9. The sound generating unit according to claim 7, characterized in that: The first S-shaped circuit and the second S-shaped circuit are formed by winding a wire; or the first S-shaped circuit and the second S-shaped circuit are formed by printing.

10. The sound generating unit according to claim 7, characterized in that: The two magnets in each magnet pair are arranged in close contact; or, The two magnets in each magnet pair are spaced apart; or, The two magnets in each magnet pair are of equal thickness; or, The thickness of each magnet pair is equal.

11. The sound generating unit according to claim 7, characterized in that: Two adjacent magnet pairs are arranged at intervals.

12. The sound generating unit according to claim 7, characterized in that: Among the two magnets in each magnet pair, the magnetic pole direction of one magnet is from the first diaphragm to the second diaphragm; the magnetic pole direction of the other magnet is from the second diaphragm to the first diaphragm.

13. The sound generating unit according to claim 1, characterized in that: The first vibration system further includes a first dome, which is formed by stacking multiple layers of first conductive circuits on the first diaphragm; the second vibration system further includes a second dome, which is formed by stacking multiple layers of second conductive circuits on the second diaphragm.

14. The sound generating unit according to claim 1, characterized in that: The first diaphragm is a planar diaphragm; and / or, The second diaphragm is a planar diaphragm.

15. The sound generating unit according to any one of claims 1 to 14, characterized in that: The sound-emitting unit further includes a shell, the magnet assembly is mounted on the shell, the first vibration system is mounted on the top surface of the shell, and the second vibration system is mounted on the bottom surface of the shell.

16. The sound generating unit according to claim 15, characterized in that: The housing comprises an upper housing and a lower housing, the upper housing and the lower housing are formed with convex parts, and the magnet assembly is formed with a concave part matched with the convex part; or, The upper shell and the lower shell are formed with recessed parts, and the magnet assembly is formed with convex parts matched with the recessed parts.

17. The sound generating unit according to claim 15, characterized in that: The housing comprises an upper housing, a lower housing, an upper fixing member and a lower fixing member, wherein the upper fixing member is arranged on the upper housing, and the lower fixing member is arranged on the lower housing, The upper fixing member and the lower fixing member are formed with convex parts, and the magnet assembly is formed with concave parts that are engaged with the convex parts; or, The upper fixing member and the lower fixing member are formed with recessed parts, and the magnet assembly is formed with convex parts that are snap-fitted with the recessed parts.

18. The sound generating unit according to claim 16, characterized in that: A first notch is formed on the upper shell, and a second notch is formed on the lower shell. The first notch and the second notch cooperate to form a sound leakage hole.

19. An electronic device, characterized in that: The electronic device comprises the sound emitting unit according to any one of claims 1 to 18.

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