Sound production device and electronic device

Abstract

The application discloses a sound production device and electronic equipment, and relates to the technical field of electroacoustic transduction, a vibrating system of the sound production device comprises a diaphragm assembly and two voice coils, the diaphragm assembly is provided with a conductive layer, each voice coil is provided with a lead part, two ends of the conductive layer are electrically connected with an external circuit and the lead part respectively, a magnet assembly of a magnetic circuit system comprises a side magnet, a shared magnet and two center magnets, the side magnet is located outside the center magnets and the shared magnet, the shared magnet is located between the two center magnets, each center magnet is arranged in a spaced mode with the side magnet and the shared magnet to form a magnetic gap, the center magnet, the side magnet and the shared magnet are made of a neodymium iron boron material and are integrally hot-pressed with a magnetic yoke. The sound production device not only realizes the ultra-thin design of the magnetic circuit, but also increases the magnet volume of the magnetic circuit system, thereby improving the sound production performance of the sound production device, and the structural reliability of the magnetic circuit system is good and is not prone to breaking, thereby improving the use stability of the product.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electro-acoustic transduction, in particular to a sound generating device and electronic equipment using the same. BACKGROUND

[0002] In recent years, with the rapid development of the field of intelligent electronics, consumer electronics products usher in a new wave of innovation, and folding electronic products have gradually entered the market. Terminal manufacturers have successively launched ultra-thin folding products, such as folding mobile phones, folding tablet computers, folding notebooks, etc. Smartphones have appeared in X or Y direction double folding or even triple folding products, which requires the thickness of the device to be thinner and thinner.

[0003] As an important electro-acoustic transduction component in consumer electronics products, the loudspeaker also follows the demand for thin and light machines and further thins down. This poses a great challenge to the internal space design and reliability of the loudspeaker. In the related art, as the thickness of the loudspeaker is thinned, the internal components, such as the magnet, the magnetic guide plate, and the magnetic yoke, need to be thinned synchronously. In particular, the thinning of the magnet greatly increases the use risk of the loudspeaker. Since the magnet is relatively brittle, it is prone to breakage after being thinned, resulting in a great loss of yield and low mass production. SUMMARY

[0004] The main purpose of the present application is to provide a sound generating device and electronic equipment, aiming to provide a sound generating device that improves the reliability of the magnetic circuit system. The sound generating device not only realizes the ultra-thin design of the magnetic circuit, but also increases the volume of the magnet of the magnetic circuit system, thereby improving the sound generating performance of the sound generating device, and making the structure of the magnetic circuit system reliable and not prone to breakage, thereby improving the use stability of the product.

[0005] To achieve the above-mentioned purpose, the present application provides a sound generating device, which comprises:

[0006] a vibration system, the vibration system vibrates along a first direction, the vibration system comprises a diaphragm assembly and two voice coils arranged side by side along a second direction, the second direction is perpendicular to the first direction, and the two voice coils are connected with the diaphragm assembly; and

[0007] a magnetic circuit system, the magnetic circuit system comprises a magnetic yoke and a magnet assembly connected with the magnetic yoke, the magnet assembly comprises a side magnet, a common magnet and two center magnets, the side magnet is located outside the center magnet and the common magnet, the common magnet is located between the two center magnets, and the two center magnets and the common magnet are arranged in a spaced manner along the second direction, so that each center magnet is arranged in a spaced manner with the side magnet and the common magnet to form a magnetic gap, each voice coil is arranged corresponding to the magnetic gap, the center magnet, the side magnet and the common magnet are made of neodymium iron boron material and are integrally formed with the magnetic yoke by hot pressing.

[0008] The diaphragm assembly is provided with a conductive layer, each voice coil is provided with a lead part, one end of the conductive layer is electrically connected with an external circuit, and the other end of the conductive layer is electrically connected with the lead part.

[0009] In an embodiment, the magnetic conductive yoke is provided with a first accommodating space corresponding to each center magnet, each center magnet comprises a first main body part and a first protruding part extending into the first accommodating space, and the outer periphery of the first protruding part is arranged in abutment with the inner wall of the first accommodating space; wherein the first accommodating space is a groove structure provided in the magnetic conductive yoke; or the first accommodating space is a through hole structure penetrating through the magnetic conductive yoke; or the first accommodating space penetrates through the magnetic conductive yoke, and the side of the first protruding part away from the first main body part is arranged in flush with the side of the magnetic conductive yoke away from the magnet assembly.

[0010] And / or, the magnetic conductive yoke is provided with a second accommodating space corresponding to the common magnet, the common magnet comprises a second main body part and a second protruding part extending into the second accommodating space, and the outer periphery of the second protruding part is arranged in abutment with the inner wall of the second accommodating space; wherein the second accommodating space is a groove structure provided in the magnetic conductive yoke; or the second accommodating space is a through hole structure penetrating through the magnetic conductive yoke; or the second accommodating space penetrates through the magnetic conductive yoke, and the side of the second protruding part away from the second main body part is arranged in flush with the side of the magnetic conductive yoke away from the magnet assembly.

[0011] In an embodiment, along the second direction, the magnetic conductive yoke has a first yoke plate and a second yoke plate arranged opposite to the magnetic gap.

[0012] Wherein, the outer peripheral wall of the first yoke plate is arranged in abutment with the side wall of the center magnet and the side magnet respectively, and the outer peripheral wall of the second yoke plate is arranged in abutment with the side wall of the center magnet and the common magnet respectively.

[0013] And / or, the first yoke plate and the second yoke plate are provided with a recessed groove extending along the first direction corresponding to the magnetic gap, and the recessed groove is used for avoiding the voice coil.

[0014] In an embodiment, the side magnet forms a closed integrated annular structure and is arranged around the center magnet and the common magnet; or the side magnet comprises a plurality of side magnets, adjacent side magnets are connected end to end to form a closed annular structure, and are arranged around the center magnet and the common magnet; or the side magnet comprises a plurality of side magnets, the plurality of side magnets are arranged around the center magnet and the common magnet with intervals therebetween, so that a first gap is formed between adjacent side magnets.

[0015] And / or, the common magnet extends along a third direction perpendicular to the second direction and is connected with the edge magnet; wherein the edge magnet and the common magnet are an integral structure.

[0016] In an embodiment, the magnetic circuit system further comprises a magnetic conductive plate assembly, the magnetic conductive plate assembly comprises an edge magnetic conductive plate, a common magnetic conductive plate and two center magnetic conductive plates, each of the center magnetic conductive plates is arranged on a side of the center magnet away from the magnetic yoke, the edge magnetic conductive plate is arranged on a side of the edge magnet away from the magnetic yoke, and the common magnetic conductive plate is arranged on a side of the common magnet away from the magnetic yoke.

[0017] Wherein, the edge magnetic conductive plate forms a closed integral ring structure; or, the edge magnetic conductive plate comprises a plurality of edge magnetic conductive plates, adjacent edge magnetic conductive plates are connected end to end to form a closed ring structure; or, the edge magnetic conductive plate comprises a plurality of edge magnetic conductive plates, the plurality of edge magnetic conductive plates are arranged at intervals so that a second gap is formed between adjacent edge magnetic conductive plates.

[0018] In an embodiment, the sound generating device further comprises a shell, an outer periphery of the diaphragm assembly is connected to one end of the shell, and the magnetic circuit system is connected to the other end of the shell.

[0019] Wherein, the edge magnetic conductive plate and the shell are an integral structure.

[0020] And / or, the shell is square, the edge magnetic conductive plate is connected to the shell, and the edge magnetic conductive plate is provided with a sound transmission hole corresponding to each of the four corner positions of the shell and arranged opposite to the diaphragm assembly.

[0021] In an embodiment, the common magnetic conductive plate extends along a third direction perpendicular to the second direction and is connected with the edge magnetic conductive plate; wherein the edge magnetic conductive plate and the common magnetic conductive plate are an integral structure.

[0022] In an embodiment, the diaphragm assembly comprises a diaphragm and a dome, the diaphragm comprises an inner ring portion, a folded ring portion arranged around the inner ring portion, and a fixed portion arranged around the folded ring portion, the inner ring portion forms a hollow hole, the dome is connected to the inner ring portion and covers the hollow hole, and the voice coil is connected to the dome.

[0023] Wherein, the diaphragm is provided with the conductive layer.

[0024] In an embodiment, the conductive layer extends from the inner ring portion to the fixed portion, a periphery of the dome is connected to a side of the inner ring portion facing the magnetic circuit system, the dome is provided with a via hole corresponding to the conductive layer, and the lead portion is connected to the conductive layer through the via hole.

[0025] And / or, the spherical top is provided with a protrusion extending towards the magnetic circuit system, and the protrusion is connected with the voice coil.

[0026] And / or, the sound generating device further comprises a shell, an outer periphery of the diaphragm assembly is connected with one end of the shell, and the magnetic circuit system is connected with the other end of the shell; wherein the shell is provided with a conductive part, and the conductive layer is connected with the conductive part in conduction.

[0027] The present application also provides an electronic device comprising the sound generating device.

[0028] The sound generating device of the present application is characterized in that the vibration system and the magnetic circuit system are arranged oppositely, two magnetic gaps are formed in the magnetic circuit system, the vibration system is arranged as a diaphragm assembly and two voice coils connected to the diaphragm assembly, the two voice coils are arranged side by side along the second direction, one end of each voice coil is connected to the diaphragm assembly, and the other end of each voice coil is arranged oppositely to the corresponding magnetic gap. Thus, the current is passed through the two voice coils, so that the two voice coils convert the electric energy into mechanical energy in the two magnetic gaps formed by the magnetic circuit system, to drive the diaphragm assembly to vibrate, thereby realizing sound generation. By arranging the double-voice coil structure, the size of the voice coil is increased, the L value of the voice coil is improved, the BL value is effectively improved when the two voice coils vibrate in the magnetic field formed by the magnetic circuit system, and the sound generating sensitivity and loudness of the sound generating device are improved, thereby improving the sound generating effect. At the same time, the magnetic circuit system is arranged as a magnetic yoke and a magnet assembly arranged on the magnetic yoke, the magnet assembly is arranged as a side magnet, a common magnet and two center magnets, the side magnet is located outside the center magnet and the common magnet, the common magnet is located between the two center magnets, and the two center magnets and the common magnet are arranged in the second direction. Each center magnet is arranged in the magnetic gap between the side magnet and the common magnet. The arrangement of the magnetic circuit system makes the structure design more compact and saves the assembly space. Further, the center magnet, the side magnet and the common magnet are made of neodymium iron boron material, and the center magnet, the side magnet and the common magnet are integrally hot-pressed with the magnetic yoke, so that the magnet assembly and the magnetic yoke realize "zero assembly", the volume of the magnet assembly is maximized, the mechanical strength of the magnet assembly is improved compared with sintered neodymium iron boron, and the magnet assembly is not easy to break. The sound generating device not only realizes the ultra-thin design of the magnetic circuit, but also increases the volume of the magnet in the magnetic circuit system, thereby improving the sound generating performance of the sound generating device. The structure of the magnetic circuit system is reliable and not easy to break, which improves the use stability of the product. The conductive layer is arranged on the diaphragm assembly, so that the space occupied by the centering support can be saved, the volume of the magnet in the magnetic circuit system is increased, and the acoustic performance of the sound generating device is improved. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to make the technical solutions in the embodiments of the present application or the prior art clearer, the accompanying drawings needed in the embodiments or prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description only show some embodiments of the present application, and for those skilled in the art, other drawings can be obtained from the structures shown in the drawings without any creative effort.

[0030] Figure 1 Structure schematic diagram of an embodiment of the sound production device provided by the present application;

[0031] Figure 2 Sectional schematic diagram of an embodiment of the sound production device provided by the present application;

[0032] Figure 3 Exploded schematic diagram of an embodiment of the sound production device provided by the present application;

[0033] Figure 4 Structure schematic diagram of an embodiment of the vibration system provided by the present application;

[0034] Figure 5 Structure schematic diagram of an embodiment of the diaphragm provided by the present application.

[0035] Explanation of the reference signs:

[0036] 100, sound production device; 1, shell; 11, conductive part; 2, magnetic circuit system; 21, magnetic yoke; 211, first accommodating space; 212, second accommodating space; 214, first yoke plate; 215, recessed groove; 216, second yoke plate; 22, magnet assembly; 221, center magnet; 2211, first main body part; 2212, first protruding part; 222, edge magnet; 223, common magnet; 2231, second main body part; 2232, second protruding part; 23, magnetic plate assembly; 231, center magnetic plate; 232, edge magnetic plate; 2322, sound transmission hole; 233, common magnetic plate; 24, magnetic gap; 3, vibration system; 31, diaphragm assembly; 311, diaphragm; 3111, inner ring part; 3112, folded ring part; 3113, fixed part; 3114, conductive layer; 3115, hollow hole; 312, ball top; 3121, via hole; 3122, protrusion; 32, voice coil; 321, lead part; 4, mesh cloth.

[0037] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0038] With reference to the accompanying drawings, the technical solutions in the embodiments of the present application will be described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0039] It should be noted that all the direction indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative position relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the direction indications also change accordingly.

[0040] Meanwhile, the meaning of "and / or" or "and / or" appearing throughout the text is that three schemes are included, for example, "A and / or B" includes A scheme, or B scheme, or A and B are satisfied at the same time.

[0041] In addition, the description such as "first", "second" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of a person of ordinary skill in the art, when the combination of technical solutions appears contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist, nor within the protection scope of the present application.

[0042] The present application provides a sound generating device 100. It can be understood that the sound generating device 100 is applied to an electronic device, which can be a mobile phone, earphones, smart wearable devices, tablet computers, notebook computers, etc., which are not limited here.

[0043] Please refer to Figures 1 to 5As shown, in the embodiment of the present application, the sound generating device 100 comprises a vibration system 3 and a magnetic circuit system 2, the vibration system 3 vibrates along a first direction, the vibration system 3 comprises a diaphragm assembly 31 and two voice coils 32 arranged side by side along a second direction, the second direction is perpendicular to the first direction, the two voice coils 32 are both connected with the diaphragm assembly 31, the magnetic circuit system 2 comprises a magnetic yoke 21 and a magnet assembly 22 connected with the magnetic yoke 21, the magnet assembly 22 comprises a side magnet 222, a common magnet 223 and two center magnets 221, the side magnet 222 is located outside the center magnets 221 and the common magnet 223, the common magnet 223 is located between the two center magnets 221, and the two center magnets 221 and the common magnet 223 are arranged in a spaced manner along the second direction, so that each center magnet 221 is arranged in a spaced manner with the side magnet 222 and the common magnet 223 to form a magnetic gap 24, each voice coil 32 is arranged in a corresponding manner with a magnetic gap 24, the center magnets 221, the side magnet 222 and the common magnet 223 are all made of neodymium iron boron material and are integrally formed with the magnetic yoke 21 by hot pressing; wherein the diaphragm assembly 31 is provided with a conductive layer 3114, each voice coil 32 is provided with a lead portion 321, one end of the conductive layer 3114 is electrically connected with an external circuit, and the other end of the conductive layer 3114 is electrically connected with the lead portion 321.

[0044] In the embodiment, the sound generating device 100 can be a sound generating unit of a loudspeaker, and the loudspeaker can be a micro loudspeaker. It should be noted that the magnetic circuit system 2 and the vibration system 3 of the sound generating device 100 are arranged in a relative manner.

[0045] In order to better assemble the magnetic circuit system 2 and the vibration system 3 of the sound generating device 100. In an embodiment, as shown, Figures 1 to 3 the sound generating device 100 further comprises a housing 1, the magnetic circuit system 2 is connected to one end of the housing 1, the vibration system 3 is connected to the other end of the housing 1 and is arranged in a relative manner with the magnetic circuit system 2.

[0046] It should be noted that the housing 1 is used for mounting, fixing and supporting components such as the magnetic circuit system 2 and the vibration system 3, that is, the housing 1 provides a mounting basis for the components such as the magnetic circuit system 2 and the vibration system 3. It can be understood that the housing 1 can be an integral structure or a plurality of split structures cooperated to form, which is not limited herein. The housing 1 in the embodiment can be selected as a square frame or a frame structure, that is, the housing 1 has a cavity with two open ends, the magnetic circuit system 2 and the vibration system 3 are connected to the two sides of the housing 1 and are arranged in a relative manner, so that the magnetic circuit system 2, the housing 1 and the diaphragm 311 of the vibration system 3 enclose a vibration cavity.

[0047] It can be understood that the sound production device 100 is applied to an electronic device, that is, the sound production device 100 can be installed in the electronic device through the shell 1. It should be noted that the shell 1 of the sound production device 100 can be a shell or a box structure independent of the electronic device. At this time, the shell 1 is used to integrate the magnetic circuit system 2 and the vibration system 3 and other components of the sound production device 100 into a whole structure, thereby facilitating disassembly. Of course, the shell 1 of the sound production device 100 can also be integrally formed with the shell or box structure of the electronic device. In this way, the structural strength and sealing performance can be effectively improved.

[0048] In the present embodiment, the shell 1 is used to accommodate and fix the vibration system 3 and the magnetic circuit system 2 and other structures. In this way, the sound production device 100 can be applied to an electronic device or a sound production module as an independent component, which is not limited herein. Of course, in other embodiments, the sound production device 100 can also be a module structure. At this time, the vibration system 3 and the magnetic circuit system 2 and other structures of the sound production device 100 are installed on the shell of the module structure as independent components, which is not limited herein.

[0049] Optionally, the sound production device 100 is arranged in a rectangular shape. In the present embodiment, the shell 1 of the sound production device 100 is optionally arranged in a rectangular shape. As shown in Figure 1 、 Figure 3 , the shell 1 has two first side edges and two second side edges connected at the head and tail, and the two first side edges and the two second side edges form a rectangular frame structure. The connection between the first side edge and the second side edge forms a corner, which is the corner position of the shell 1.

[0050] It should be noted that, as shown in Figures 1 to 4 , in one specific example of the present application, the vibration direction of the vibration system 3 of the sound production device 100 is the first direction (i.e., the height direction of the shell 1), the short side direction of the sound production device 100 (i.e., the extension direction of the first side edge of the shell 1) is the second direction, and the long side direction of the sound production device 100 (i.e., the extension direction of the second side edge of the shell 1) is the third direction. At this time, the first direction, the second direction and the third direction are perpendicular to each other. In the present embodiment, the first direction is the thickness direction or the Z direction of the sound production device 100, and the vibration system 3 vibrates along the first direction (e.g., the vertical direction). Of course, in other embodiments, the long side direction of the sound production device 100 can be the second direction, and the short side direction of the sound production device 100 is the third direction, which is not limited herein.

[0051] In the embodiment, the vibration system 3 comprises a diaphragm assembly 31 and two voice coils 32 connected to the diaphragm assembly 31, the magnetic circuit system 2 is provided with two magnetic gaps 24, the periphery of the diaphragm assembly 31 is connected to the housing 1, and each voice coil 32 is arranged in correspondence with one magnetic gap 24. It can be understood that current is passed through the two voice coils 32, so that the two voice coils 32 convert electrical energy into mechanical energy in the two magnetic gaps 24 formed by the magnetic circuit system 2, to drive the two voice coils 32 to drive the diaphragm assembly 31 to vibrate, thereby realizing sound emission.

[0052] It can be understood that, in the case of limited space, the sound emitting device 100 adopts a double-voice coil structure, which can increase the total length of the voice coil 32, improve the L value of the voice coil 32, and thereby improve the product BL value of the sound emitting device 100, and further improve the sound emitting sensitivity of the sound emitting device 100.

[0053] In an embodiment, the magnet assembly 22 comprises a center magnet 221, an edge magnet 222, and a shared magnet 223, the edge magnet 222 is located outside the center magnet 221 and the shared magnet 223, and the center magnet 221 and the shared magnet 223 are arranged in a second direction.

[0054] It can be understood that, compared with the case where assembly tolerance and material tolerance exist in normal assembly, especially at some R angle positions, the tolerance is generally larger. In the embodiment, the center magnet 221, the edge magnet 222, and the shared magnet 223 are all made of neodymium iron boron material and are integrally hot-pressed with the magnetic yoke 21. Such arrangement makes the center magnet 221, the edge magnet 222, and the shared magnet 223 realize "zero assembly" with the magnetic yoke 21, that is, the connection parts of the center magnet 221, the edge magnet 222, and the shared magnet 223 with the magnetic yoke 21 are nearly completely fitted, eliminating the assembly tolerance and material tolerance, thereby increasing the magnet volume of the magnet assembly 22, and at the same time improving the structural strength of the assembly structure of the center magnet 221, the edge magnet 222, and the shared magnet 223 with the magnetic yoke 21, which is not easy to break.

[0055] Optionally, the center magnet 221 comprises at least two, and the shared magnet 223 comprises at least one, each shared magnet 223 is located between two adjacent center magnets 221 and is arranged in a spaced manner.

[0056] In the embodiment, as Figures 2 to 3As shown, when the number of the center magnets 221 is two and the number of the common magnets 223 is one, each of the center magnets 221 is spaced apart from the side magnets 222 and the common magnet 223 to form a magnetic gap 24. Of course, in other embodiments, when the number of the center magnets 221 is N and the number of the common magnets 223 is N-1, N>2, the magnetic gap 24 includes a first magnetic gap and a second magnetic gap, each of the center magnets 221 is spaced apart from the side magnets 222 and the common magnet 223 to form the first magnetic gap, and each of the center magnets 221 is spaced apart from the adjacent two common magnets 223 to form the second magnetic gap.

[0057] It can be understood that the vibration system 3 of the sound production device 100 includes a plurality of voice coils 32, and each of the voice coils 32 is arranged corresponding to a magnetic gap 24. In the embodiment, as shown in Figures 2 to 4 As shown, when the number of the center magnets 221 is two and the number of the common magnets 223 is one, the magnetic circuit system 2 forms two magnetic gaps 24, and the vibration system 3 includes two voice coils 32, each of which is arranged corresponding to a magnetic gap 24, and each of which surrounds a center magnet 221.

[0058] In other embodiments, when the number of the center magnets 221 is N and the number of the common magnets 223 is N-1, N>2, the two center magnets 221 located at both sides are spaced apart from the side magnets 222 and the common magnet 223 to form two first magnetic gaps, and the center magnet 221 located in the middle is spaced apart from the adjacent two common magnets 223 to form a second magnetic gap. Alternatively, the number of the center magnets 221 is at least three, and the number of the magnetic gaps 24 (i.e. the sum of the number of the first magnetic gaps and the number of the second magnetic gaps) is consistent with the number of the center magnets 221. In the embodiment, the number of the voice coils 32 is consistent with the number of the magnetic gaps 24 and the number of the center magnets 221, which is not limited herein.

[0059] In order to realize the electrical connection and conduction of the voice coil 32 and the external circuit, in an embodiment, the diaphragm assembly 31 is provided with a conductive layer 3114, the voice coil 32 has a lead part 321, one end of the conductive layer 3114 is electrically connected with the external circuit, and the other end of the conductive layer 3114 is connected with the lead part 321.

[0060] In the embodiment, as shown in Figure 4 and Figure 5 The conductive layer 3114 can be a conductive coating coated on the diaphragm assembly 31, or the conductive layer 3114 can be a conductive glue or a metal conductive layer pasted on the diaphragm assembly 31, which is not limited herein. It can be understood that by arranging the conductive layer 3114 on the diaphragm assembly 31, the lead part 321 of the voice coil 32 is electrically connected and conducted with the external circuit through the conductive layer 3114, so that the spider space can be saved, the volume of the magnet is increased, and the performance of the sound production device 100 is improved.

[0061] Optionally, the two voice coils 32 can be connected in series or connected in parallel. It should be noted that the two voice coils 32 can be connected to the external circuit through a conductive connection or other means, and the two voice coils 32 can be connected in series or connected in parallel through a wire or a conductive branch, etc., which is not limited herein. In this embodiment, the two voice coils 32 are connected in series. In this way, the two voice coils 32 can be simultaneously formed by winding the same voice coil wire, so that the two voice coils 32 are connected in series, which is not limited herein.

[0062] The sound generating device 100 of the present application is characterized in that the vibration system 3 is arranged opposite to the magnetic circuit system 2, and two magnetic gaps 24 are formed in the magnetic circuit system 2; the vibration system 3 is arranged as a diaphragm assembly 31 and two voice coils 32 connected to the diaphragm assembly 31; the two voice coils 32 are arranged side by side along the second direction, so that one end of each voice coil 32 is connected to the diaphragm assembly 31, and the other end of each voice coil 32 is arranged opposite to the corresponding magnetic gap 24; and current is passed through the two voice coils 32, so that the two voice coils 32 convert electric energy into mechanical energy in the two magnetic gaps 24 formed by the magnetic circuit system 2, to drive the diaphragm assembly 31 to vibrate, thereby generating sound. By arranging the double-voice-coil structure, increasing the size of the voice coil 32, and improving the L value of the voice coil 32, the BL value is effectively improved when the two voice coils 32 vibrate in the magnetic field formed by the magnetic circuit system 2, thereby improving the sound generating sensitivity and loudness of the sound generating device 100 and improving the sound generating effect. Meanwhile, the magnetic circuit system 2 is arranged as a magnetic yoke 21 and a magnet assembly 22 arranged on the magnetic yoke 21, and the magnet assembly 22 is arranged as a side magnet 222, a common magnet 223, and two center magnets 221, so that the side magnet 222 is located outside the center magnet 221 and the common magnet 223, and the common magnet 223 is located between the two center magnets 221, and the two center magnets 221 and the common magnet 223 are arranged in the second direction. In this way, the structure of the magnetic circuit system 2 is more compact, and the assembly space is saved. Further, the center magnet 221, the side magnet 222, and the common magnet 223 are all made of neodymium-iron-boron material, and the center magnet 221, the side magnet 222, and the common magnet 223 are all integrally hot-pressed with the magnetic yoke 21, so that the magnet assembly 22 and the magnetic yoke 21 are "zero-fitted", the volume of the magnet assembly 22 is maximized, and compared with sintered neodymium-iron-boron, hot-pressed neodymium-iron-boron can improve the mechanical strength of the magnet assembly 22 and is not easy to break, so that the sound generating device 100 not only realizes the ultra-thin design of the magnetic circuit, but also increases the volume of the magnet of the magnetic circuit system 2, thereby improving the sound generating performance of the sound generating device 100, and the structure of the magnetic circuit system 2 is reliable and not easy to break, which not only improves the use stability of the product, but also increases the volume of the magnet in the magnetic circuit system 2 by arranging the conductive layer 3114 on the diaphragm assembly 31, thereby improving the acoustic performance of the sound generating device 100.

[0063] In an embodiment, the magnetic yoke 21 is provided with a first accommodating space 211 corresponding to each center magnet 221, and each center magnet 221 includes a first main body part 2211 and a first protruding part 2212 extending into the first accommodating space 211, and the outer periphery of the first protruding part 2212 is arranged in close contact with the inner wall of the first accommodating space 211.

[0064] In the embodiment, as shown in Figure 2 and Figure 3 , by setting the first accommodating space 211 on the magnetic yoke 21 corresponding to the center magnet 221, and setting the center magnet 221 as the first main body part 2211 and the first protruding part 2212 extending into the first accommodating space 211, when the center magnet 221 and the magnetic yoke 21 are integrally hot-pressed, the outer periphery of the first protruding part 2212 is arranged in close contact with the inner wall of the first accommodating space 211, so that the center magnet 221 and the magnetic yoke 21 realize "zero assembly", the volume of the center magnet 221 can be maximized, and compared with sintered neodymium iron boron, hot-pressed neodymium iron boron can improve the mechanical strength of the magnet assembly 22 and is not easy to break, so that the sound generating device 100 not only realizes the ultra-thin design of the magnetic circuit, but also increases the volume of the magnet of the magnetic circuit system 2, thereby improving the product BL value of the sound generating device 100, improving the sound generating effect, and making the structure of the magnetic circuit system 2 reliable and not easy to break.

[0065] It should be noted that the first accommodating space 211 of the magnetic yoke 21 can be a groove structure or a through-hole structure, which is not limited here. Alternatively, the first accommodating space 211 is a groove structure provided on the magnetic yoke 21. In the embodiment, as shown in Figure 2 , Figure 3 , the first accommodating space 211 is a through-hole structure penetrating the magnetic yoke 21.

[0066] In an embodiment, the first accommodating space 211 penetrates the magnetic yoke 21, and the side of the first protruding part 2212 away from the first main body part 2211 is flush with the side of the magnetic yoke 21 away from the magnet assembly 22. As shown in Figure 2 , by arranging the side of the magnetic yoke 21 away from the magnet assembly 22 flush with the side of the first protruding part 2212 of the center magnet 221 away from the first main body part 2211, the assembly structure between the center magnet 221 and the magnetic yoke 21 is more compact.

[0067] In an embodiment, the magnetic yoke 21 is provided with a second accommodating space 212 corresponding to the common magnet 223, and the common magnet 223 includes a second main body part 2231 and a second protruding part 2232 extending into the second accommodating space 212, and the outer periphery of the second protruding part 2232 is arranged in close contact with the inner wall of the second accommodating space 212.

[0068] In the embodiment, as shown in Figure 2 and Figure 3As shown, by providing a second receiving space 212 on the magnetic yoke 21 corresponding to the common magnet 223, and by setting the common magnet 223 as the second main body 2231 and the second protrusion 2232 extending into the second receiving space 212, when the common magnet 223 and the magnetic yoke 21 are integrally hot-pressed, the outer periphery of the second protrusion 2232 is fitted to the inner wall of the second receiving space 212, thereby achieving "zero matching" between the common magnet 223 and the magnetic yoke 21. This maximizes the volume of the common magnet 223. Compared with sintered NdFeB, hot-pressed NdFeB can improve the mechanical strength of the magnet assembly 22 and is less prone to breakage. This allows the sound-generating device 100 to not only achieve an ultra-thin magnetic circuit design, but also increase the magnet volume of the magnetic circuit system 2, thereby improving the product BL value of the sound-generating device 100, improving the sound generation effect, and making the structure of the magnetic circuit system 2 more reliable and less prone to breakage.

[0069] It should be noted that the second receiving space 212 of the magnetic yoke 21 can be a groove structure or a through-hole structure, and is not limited here. Optionally, the second receiving space 212 is a groove structure provided in the magnetic yoke 21. In this embodiment, as... Figure 2 , Figure 3 As shown, the second accommodating space 212 is a through-hole structure that passes through the magnetic yoke 21.

[0070] In one embodiment, the second receiving space 212 extends through the magnetic yoke 21, and the side of the second protrusion 2232 facing away from the second main body 2231 is flush with the side of the magnetic yoke 21 facing away from the magnet assembly 22. It is understood that, as Figure 2 As shown, by aligning the side of the magnetic yoke 21 facing away from the magnet assembly 22 with the side of the second protrusion 2232 of the common magnet 223 facing away from the second main body 2231, the assembly structure between the common magnet 223 and the magnetic yoke 21 becomes more compact.

[0071] Of course, in other embodiments, the side magnet 222 includes a main body and a protrusion, which is not limited here.

[0072] In one embodiment, along the second direction, the magnetic yoke 21 has a first yoke plate 214 and a second yoke plate 216 disposed opposite to the magnetic gap 24.

[0073] Understandable, such as Figures 2 to 3 As shown, the magnetic circuit system 2 forms two magnetic gaps 24, meaning the voice coil 32 includes two. The magnetic yoke 21 is provided with a first yoke plate 214 and a second yoke plate 216 corresponding to each magnetic gap 24. Optionally, each magnetic gap 24 has two long sides and two short sides connected end-to-end, and the first yoke plate 214 and the second yoke plate 216 of the magnetic yoke 21 are respectively provided corresponding to the two long sides or the two short sides of the magnetic gap 24; this is not limited here.

[0074] In the present embodiment, as shown in Figure 2 the outer peripheral walls of the first yoke plate 214 are respectively arranged in abutment with the side walls of the center magnet 221 and the side magnet 222, and the outer peripheral walls of the second yoke plate 216 are respectively arranged in abutment with the side walls of the center magnet 221 and the common magnet 223.

[0075] It can be understood that, as shown in Figure 2 , Figure 3 the first yoke plate 214 and the second yoke plate 216 have a first dimension L1 along the second direction and a second dimension L2 along the third direction, and the first dimension L1 is smaller than the second dimension L2.

[0076] In the present embodiment, the thickness of the voice coil 32 is defined as D, and the thickness D of the voice coil 32 and the first dimension L1 of the first yoke plate 214 and the second yoke plate 216 satisfy: 0.1≤D / L1<1. It should be noted that the size of the first dimension L1 of the first yoke plate 214 and the second yoke plate 216 affects the magnetic concentration effect and the magnetic conductivity of the first yoke plate 214 and the second yoke plate 216. When L1 is too small, the magnetic concentration effect and the magnetic conductivity of the first yoke plate 214 and the second yoke plate 216 are limited, thereby affecting the magnetic field strength acting on the voice coil 32; when L1 is too large, although the magnetic concentration effect and the magnetic conductivity can be satisfied, the weight of the magnetic circuit system 2 is increased, and the setting volume of the magnet assembly 22 is also reduced, thereby affecting the B value of the magnetic circuit system 2 and affecting the sound production performance of the sound production device 100. When 0.1≤D / L1<1, the design requirements of the magnetic concentration effect, the magnetic conductivity of the first yoke plate 214 and the second yoke plate 216, and the thinness and high acoustic performance of the sound production device 100 can be considered.

[0077] In the present embodiment, the ratio of the thickness D of the voice coil 32 to the first dimension L1 of the first yoke plate 214 and the second yoke plate 216 can be selected as 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, etc., which is not limited herein. Alternatively, the first dimension L1 of the first yoke plate 214 and the second yoke plate 216 is at least greater than the width of the magnetic gap 24 (i.e., the distance between the center magnet 221 and the side magnet 222, and the distance between the center magnet 221 and the common magnet 223).

[0078] Alternatively, the first dimension L1 of the first yoke plate 214 along the second direction is the same as the first dimension L1 of the second yoke plate 216 along the second direction. The second dimension L2 of the first yoke plate 214 along the third direction is the same as the second dimension L2 of the second yoke plate 216 along the third direction, which is not limited herein.

[0079] In an embodiment, the first yoke plate 214 and the second yoke plate 216 have a maximum dimension H1 along the first direction, and the magnet assembly 22 has a maximum dimension H2 along the first direction, and the maximum dimension H2 and the maximum dimension H1 satisfy: 2≤H2 / H1≤10.

[0080] It can be understood that if the maximum dimension H1 of the first yoke plate 214 and the second yoke plate 216 is too small, the magnetic concentration effect and the magnetic conductivity of the first yoke plate 214 and the second yoke plate 216 are affected; and if the maximum dimension H1 of the first yoke plate 214 and the second yoke plate 216 is too large, the weight of the magnetic circuit system 2 is increased, and the light and thin design requirement of the sound generating device 100 cannot be met. Moreover, under the condition of the same product height, if the maximum dimension H1 of the first yoke plate 214 and the second yoke plate 216 is too large, the maximum dimension H2 of the magnet assembly 22 is reduced, so that the volume of the magnet assembly 22 is reduced, the magnetic field strength of the magnetic circuit system 2 is reduced, the product BL value of the sound generating device 100 is reduced, and the acoustic performance of the sound generating device 100 is affected.

[0081] In the embodiment, by setting the ratio of the maximum dimension H2 of the magnet assembly 22 to the maximum dimension H1 of the first yoke plate 214 and the second yoke plate 216 in the range of 2-10, the first yoke plate 214 and the second yoke plate 216 not only meet the magnetic concentration effect and the magnetic conductivity required by the sound generating device 100, but also ensure that the volume of the magnet assembly 22 meets the use requirement, that is, ensure that the magnetic field strength generated by the magnet assembly 22 meets the use requirement of the voice coil 32. Alternatively, the ratio of the maximum dimension H2 of the magnet assembly 22 to the maximum dimension H1 of the first yoke plate 214 and the second yoke plate 216 can be 2, 3, 4, 5, 6, 7, 8, 9, 10, etc., which is not limited herein.

[0082] Alternatively, the first yoke plate 214 and the second yoke plate 216 are provided with recess grooves 215 extending along the first direction corresponding to the magnetic gap 24, and the recess grooves 215 are used to avoid the voice coil 32. It can be understood that the first yoke plate 214 and the second yoke plate 216 are both provided with the recess grooves 215, which can prevent the voice coil 32 from interfering with the first yoke plate 214 and the second yoke plate 216 in the vibration direction, so as to provide more space for the vibration of the voice coil 32 by using the recess grooves 215.

[0083] It should be noted that the first yoke plate 214 and the second yoke plate 216 both extend along the third direction, and the first yoke plate 214 and the second yoke plate 216 are spaced apart along the second direction. In the embodiment, the first yoke plate 214 and the second yoke plate 216 both have a maximum dimension H1 along the first direction. Alternatively, the maximum dimension H1 of the first yoke plate 214 along the first direction is the same as the maximum dimension H1 of the second yoke plate 216 along the first direction.

[0084] Optionally, the side magnets 222 form a closed and integral annular structure, and surround the center magnets 221 and the common magnet 223. In this way, the volume of the side magnets 222 can be effectively increased, so as to increase the magnetic field strength. Meanwhile, the processing steps and assembly procedures of the side magnets 222 can be simplified.

[0085] Of course, in other embodiments, the side magnets 222 include a plurality of side magnets 222, and the adjacent side magnets 222 are connected end to end to form a closed annular structure, and surround the center magnets 221 and the common magnet 223. In this way, the volume of the side magnets 222 can be effectively increased, so as to increase the magnetic field strength.

[0086] Alternatively, the side magnets 222 include a plurality of side magnets 222, and the plurality of side magnets 222 are spaced apart and surround the center magnets 221 and the common magnet 223, so that the first gaps are formed between the adjacent side magnets 222. In this way, the first gaps between the adjacent side magnets 222 can be used to provide installation and avoiding space for the centering fins of the sound generating device 100.

[0087] In an embodiment, as shown in Figure 3 the common magnet 223 extends along a third direction perpendicular to the second direction, and is connected with the side magnets 222. It can be understood that the common magnet 223 and the side magnets 222 can be connected by welding or bonding. Optionally, the side magnets 222 and the common magnet 223 are integrally formed. In this way, the structure design of the magnetic circuit system 2 can be simplified, and the volume of the magnets can be further increased, so as to increase the magnetic field strength, since there is no need to reserve a gap for gluing between the side magnets 222 and the common magnet 223.

[0088] In an embodiment, the magnetic circuit system 2 further includes a magnetic plate assembly 23, and the magnetic plate assembly 23 includes a side magnetic plate 232, a common magnetic plate 233, and two center magnetic plates 231. Each center magnetic plate 231 is arranged on a side of the center magnet 221 away from the magnetic yoke 21, the side magnetic plate 232 is arranged on a side of the side magnet 222 away from the magnetic yoke 21, and the common magnetic plate 233 is arranged on a side of the common magnet 223 away from the magnetic yoke 21.

[0089] In the embodiment, as shown in Figure 2 and Figure 3 by arranging the magnetic plate assembly 23, the center magnetic plate 231, the side magnetic plate 232, and the common magnetic plate 233 of the magnetic plate assembly 23 correspond to the center magnet 221, the side magnet 222, and the common magnet 223, respectively. In this way, the center magnetic plate 231, the side magnetic plate 232, and the common magnetic plate 233 can respectively concentrate and guide the magnetic field of the center magnet 221, the side magnet 222, and the common magnet 223, so that the magnetic circuit system 2 forms a magnetic loop, and the magnetic lines of the magnetic field can be concentrated to pass through the voice coil 32 in the magnetic gap 24.

[0090] It can be understood that the outer contour of the center magnetic conductive plate 231 is consistent with the outer contour of the center magnet 221, the outer contour of the edge magnetic conductive plate 232 is consistent with the outer contour of the edge magnet 222, and the outer contour of the shared magnetic conductive plate 233 is consistent with the outer contour of the shared magnet 223. Alternatively, the center magnetic conductive plate 231 and the center magnet 221 are both in a plate structure.

[0091] In the embodiment, the center magnetic conductive plate 231 and the center magnet 221 are one-to-one corresponding, and the shared magnetic conductive plate 233 and the shared magnet 223 are one-to-one corresponding.

[0092] Alternatively, the edge magnetic conductive plate 232 forms a closed integrated annular structure. It can be understood that the edge magnetic conductive plate 232 is an integrated annular structure, at this time the edge magnet 222 can be an integrated annular structure or a closed annular structure formed by a plurality of edge magnets 222 or a plurality of edge magnets 222 arranged at intervals, etc., which is not limited here.

[0093] Alternatively, the edge magnetic conductive plate 232 includes a plurality of edge magnetic conductive plates 232, and adjacent edge magnetic conductive plates 232 are connected end to end to form a closed annular structure. It can be understood that a plurality of edge magnetic conductive plates 232 form a closed annular structure, at this time the edge magnet 222 can be an integrated annular structure or a closed annular structure formed by a plurality of edge magnets 222 or a plurality of edge magnets 222 arranged at intervals, etc., which is not limited here.

[0094] Alternatively, the edge magnetic conductive plate 232 includes a plurality of edge magnetic conductive plates 232, and the plurality of edge magnetic conductive plates 232 are arranged at intervals to form a second gap between adjacent edge magnetic conductive plates 232. It can be understood that a plurality of edge magnetic conductive plates 232 are arranged at intervals, at this time the edge magnet 222 can be an integrated annular structure or a closed annular structure formed by a plurality of edge magnets 222 or a plurality of edge magnets 222 arranged at intervals, etc., which is not limited here.

[0095] Alternatively, the edge magnetic conductive plate 232 is arranged one-to-one corresponding to the edge magnet 222, which is not limited here.

[0096] In an embodiment, the side of the edge magnetic conductive plate 232 away from the edge magnet 222 is provided with a groove extending in the first direction, and the groove is used to avoid the lead part 321 of the voice coil 32.

[0097] In the embodiment, by providing a groove on the edge magnetic conductive plate 232, the groove is located on the side of the edge magnetic conductive plate 232 away from the edge magnet 222, and extends in the first direction, so that when the voice coil 32 vibrates, the groove can provide avoidance for the lead part 321 of the voice coil 32. Alternatively, the groove is arranged at four corner positions of the edge magnetic conductive plate 232.

[0098] In an embodiment, the common magnetic conducting plate 233 extends along a third direction perpendicular to the second direction and is connected with the edge magnetic conducting plate 232. It can be understood that the common magnetic conducting plate 233 and the edge magnetic conducting plate 232 can be connected by welding or bonding. Alternatively, the edge magnetic conducting plate 232 and the common magnetic conducting plate 233 are integrally formed. In this way, the structural strength of the magnetic circuit system 2 can be improved, and the magnetic field strength can be further improved.

[0099] In an embodiment, the sound production device 100 further comprises a housing 1, the outer periphery of the diaphragm assembly 31 is connected with one end of the housing 1, and the magnetic circuit system 2 is connected with the other end of the housing 1.

[0100] In the present embodiment, as shown in Figures 1 to 3 , the housing 1 is arranged to accommodate, mount and fix the magnetic circuit system 2 and the vibration system 3. The outer periphery of the diaphragm assembly 31 of the vibration system 3 is connected with the housing 1, and the magnetic circuit system 2 is connected with the housing 1 through the edge magnetic conducting plate 232. Alternatively, the edge magnetic conducting plate 232 and the housing 1 are integrally formed, which is not limited herein.

[0101] In an embodiment, the housing 1 is square, the edge magnetic conducting plate 232 is connected with the housing 1, and the edge magnetic conducting plate 232 is provided with sound transmission holes 2322 corresponding to the four corner positions of the housing 1 and arranged opposite to the diaphragm assembly 31.

[0102] In the present embodiment, as shown in Figure 3 , the sound transmission holes 2322 are arranged at the positions corresponding to the four corner positions of the housing 1 on the edge magnetic conducting plate 232. In this way, when the diaphragm assembly 31 vibrates, the air pressure in the vibration cavity or the back cavity can be quickly circulated, so as to achieve air pressure balance, thereby making the sound production of the sound production device 100 more smooth. It can be understood that the edge magnet 222 is provided with a avoiding structure corresponding to the sound transmission hole 2322 of the edge magnetic conducting plate 232.

[0103] In an embodiment, the diaphragm assembly 31 comprises a diaphragm 311 and a dome 312, the diaphragm 311 comprises an inner ring portion 3111, a folded ring portion 3112 arranged around the inner ring portion 3111, and a fixed portion 3113 arranged around the folded ring portion 3112, the inner ring portion 3111 forms a hollow hole 3115, the dome 312 is connected to the inner ring portion 3111 and covers the hollow hole 3115, and the voice coil 32 is connected to the dome 312.

[0104] In the present embodiment, as shown in Figures 1 to 5As shown, the diaphragm 311 includes an inner ring portion 3111, a folded ring portion 3112 and a fixed portion 3113 connected in sequence from inside to outside, the inner ring portion 3111 is connected with the dome 312, the fixed portion 3113 is connected with the shell 1, and the two voice coils 32 are connected with the dome 312. Optionally, the inner ring portion 3111 forms a hollow hole 3115, and the dome 312 is connected to the inner ring portion 3111 and covers the hollow hole 3115. In this way, the weight of the diaphragm assembly 31 can be reduced.

[0105] It should be noted that the diaphragm 311 and the dome 312 of the diaphragm assembly 31 can be an integrally formed structure, for example, integrally injection molded or integrally machined, etc., which is not limited herein. Of course, in other embodiments, the diaphragm 311 and the dome 312 of the diaphragm assembly 31 can be a split structure, and the dome 312 and the inner ring portion 3111 of the diaphragm 311 can be connected by bonding, which is not limited herein.

[0106] In order to further improve the connection stability and waterproof sealing of the diaphragm 311 and the shell 1, the outer periphery of the diaphragm 311 is bent and extended to form a bent portion towards the shell 1, and the bent portion is connected with the outer wall of the shell 1. In this embodiment, the end of the fixed portion 3113 away from the folded ring portion 3112 is bent and extended to form a bent portion towards the shell 1, and the bent portion is connected to the outer wall of the shell 1, that is, the bent portion is formed by the outer periphery of the fixed portion 3113 of the diaphragm 311 bent and extended towards the shell 1. Optionally, the inner ring portion 3111, the folded ring portion 3112, the fixed portion 3113 and the bent portion of the diaphragm 311 are integrally formed.

[0107] In this embodiment, as shown in Figure 4 and Figure 5 The diaphragm 311 is provided with a conductive layer 3114. In this way, one end of the conductive layer 3114 is connected with the external circuit, and the other end of the conductive layer 3114 is electrically connected with the lead portion 321 of the voice coil 32, so as to realize the connection and conduction of the voice coil 32 with the external circuit.

[0108] In an embodiment, the conductive layer 3114 extends from the inner ring portion 3111 to the fixed portion 3113, the periphery of the dome 312 is connected to one side of the inner ring portion 3111 facing the magnetic circuit system 2, the dome 312 is provided with a via hole 3121 corresponding to the conductive layer 3114, and the lead portion 321 passes through the via hole 3121 to connect with the conductive layer 3114.

[0109] In this embodiment, as shown in Figure 4 and Figure 5 By extending the conductive layer 3114 from the inner ring portion 3111 to the fixed portion 3113 and providing the via hole 3121 on the dome 312, the lead portion 321 can be conveniently connected with the conductive layer 3114 by passing through the via hole 3121 when the voice coil 32 is connected to the dome 312.

[0110] In order to adjust the position of the voice coil 32 in the magnetic gap 24, in an embodiment, the ball top 312 is provided with a protrusion 3122 extending towards the magnetic circuit system 2, and the protrusion 3122 is connected with the voice coil 32. In this way, one end of the voice coil 32 is connected with the protrusion 3122, and the other end of the voice coil 32 is suspended in the magnetic gap 24. In this way, the voice coil 32 can be placed in the appropriate position of the magnetic gap 24 by the protrusion 3122 of the ball top 312, and more magnetic lines in the magnetic gap 24 can pass through the voice coil 32.

[0111] In an embodiment, the sound generating device 100 further comprises a shell 1, the outer periphery of the diaphragm assembly 31 is connected with one end of the shell 1, and the magnetic circuit system 2 is connected with the other end of the shell 1; wherein the shell 1 is provided with a conductive part 11, and the conductive layer 3114 is connected in conduction with the conductive part 11.

[0112] In the present embodiment, as shown in Figure 3 , by providing the conductive part 11 on the shell 1, when the fixed part 3113 of the diaphragm 311 is connected with the shell 1, the conductive layer 3114 on the fixed part 3113 is connected in conduction with the conductive part 11.

[0113] In an embodiment, the magnetic circuit system 2 is provided with a plurality of magnetic gaps 24, and the plurality of magnetic gaps 24 are arranged in a second direction perpendicular to the first direction; the voice coil 32 comprises a plurality of voice coils 32, and each voice coil 32 is arranged in the second direction and corresponds to one magnetic gap 24.

[0114] As can be understood, as shown in Figures 2 to 4 , by providing a plurality of voice coils 32, the total length of the voice coil 32 is increased, so that the product BL value of the sound generating device 100 can be increased, and the sound generating sensitivity and loudness of the sound generating device 100 can be greatly improved, and the sound generating effect can be improved.

[0115] It should be noted that in order to further increase the total length of the voice coil 32, the number of voice coils 32 can be ≥2, and on this basis, a ring-shaped magnetic circuit is further designed to increase the magnet volume of the magnetic circuit system 2, thereby increasing the BL value. As can be understood, the number of voice coils 32 is consistent with the number of center magnets 221, and when the number of voice coils 32 is N, N≥2, the number of center magnets 221 is N, and the number of common magnets 223 is N-1.

[0116] In an embodiment, as shown in Figures 1 to 3As shown, the sound production device 100 further comprises a mesh cloth 4 connected to the side of the magnetic circuit system 2 away from the vibration system 3. It can be understood that the magnetic circuit system 2 and / or the shell 1 is provided with a vent hole communicating with the vibration cavity or rear cavity, and the mesh cloth 4 covers the vent hole, so that when the sound production device 100 is installed in the module shell or box, the mesh cloth 4 can prevent sound-absorbing particles and other structures from entering the vibration cavity of the sound production device 100 through the vent hole.

[0117] The present application also provides an electronic device comprising the sound production device 100 described above. The specific structure of the sound production device 100 is referred to the foregoing embodiments. Since the electronic device adopts all the technical solutions of the foregoing embodiments, it at least has all the beneficial effects brought by the technical solutions of the foregoing embodiments, which will not be repeated here.

[0118] In an embodiment, the electronic device further comprises a device shell and a flexible circuit board, the sound production device 100 is arranged in the device shell, one end of the flexible circuit board is electrically connected with the sound production device 100, and the other end of the flexible circuit board is used to connect an external power supply.

[0119] It can be understood that the flexible circuit board is used to connect and conduct the external circuit with the sound production device 100. The flexible circuit board is provided with an inner pad and an outer pad, the inner pad of the flexible circuit board is connected and conducted with the sound production device 100, and the outer pad of the flexible circuit board is used to connect with an external terminal.

[0120] In the embodiment, the device shell has a containing cavity, the sound production device 100 is arranged in the containing cavity of the device shell, and the end of the flexible circuit board connected with the sound production device 100 is located in the containing cavity of the device shell. Of course, in other embodiments, the flexible circuit board can also be arranged in the containing cavity of the device shell, which is not limited here.

[0121] It can be understood that the electronic device can be a headset, a mobile phone, a computer, a tablet computer, a smart wearable device, etc., which is not limited here. In the electronic device, the sound production device 100 can be assembled into the shell of the electronic device in the form of a module, or can be assembled into the shell of the electronic device in the form of a single body. The electronic device can be a mobile phone, an MP3, an MP4, a tablet computer, a notebook computer, a headset, a wearable device, etc., which will not be listed one by one here.

[0122] The above is only an optional embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structural transformation made by using the content of the present application specification and drawings, or direct / indirect application in other related technical fields is included in the patent protection scope of the present application.

Claims

1. A sound-generating device, characterized in that, The sound-generating device includes: A vibration system, the vibration system vibrating along a first direction, the vibration system including a diaphragm assembly and two voice coils arranged side by side along a second direction perpendicular to the first direction, both voice coils being connected to the diaphragm assembly; and A magnetic circuit system includes a magnetic yoke and a magnet assembly connected to the magnetic yoke. The magnet assembly includes a side magnet, a common magnet, and two center magnets. The side magnets are located outside the center magnets and the common magnets. The common magnets are located between the two center magnets. The two center magnets and the common magnets are arranged at intervals along a second direction, such that each center magnet is spaced apart from the side magnets and the common magnets to form a magnetic gap. Each voice coil is correspondingly arranged with one magnetic gap. The center magnets, the side magnets, and the common magnets are all made of neodymium iron boron material and are integrally hot-pressed with the magnetic yoke. The diaphragm assembly includes a conductive layer, and each voice coil has a lead portion. One end of the conductive layer is electrically connected to an external circuit, and the other end of the conductive layer is electrically connected to the lead portion. The diaphragm assembly includes a diaphragm and a dome. The diaphragm includes an inner ring, a folded ring surrounding the inner ring, and a fixing portion surrounding the folded ring. The conductive layer extends from the inner ring to the fixing portion. The periphery of the dome is connected to the side of the inner ring facing the magnetic circuit system. The dome has a through hole corresponding to the conductive layer. The lead portion passes through the through hole and connects to the conductive layer. The voice coil is connected to the dome.

2. The sound-generating device as described in claim 1, characterized in that, The magnetic yoke has a first receiving space corresponding to each of the central magnets. Each central magnet includes a first main body and a first protrusion extending into the first receiving space. The outer periphery of the first protrusion is fitted against the inner wall of the first receiving space. The first receiving space is a groove structure provided in the magnetic yoke; or, the first receiving space is a through hole structure that passes through the magnetic yoke; or, the first receiving space passes through the magnetic yoke, and the side of the first protrusion facing away from the first main body is flush with the side of the magnetic yoke facing away from the magnet assembly. And / or, the magnetic yoke has a second receiving space corresponding to the common magnet, the common magnet includes a second main body and a second protrusion extending into the second receiving space, the outer periphery of the second protrusion is fitted to the inner wall of the second receiving space; wherein, the second receiving space is a groove structure provided in the magnetic yoke; or, the second receiving space is a through hole structure penetrating the magnetic yoke; or, the second receiving space penetrates the magnetic yoke, the side of the second protrusion facing away from the second main body is flush with the side of the magnetic yoke facing away from the magnet assembly.

3. The sound-generating device as described in claim 1, characterized in that, Along the second direction, the magnetic yoke has a first yoke plate and a second yoke plate disposed opposite to the magnetic gap; Wherein, the outer peripheral wall of the first yoke plate is respectively attached to the side wall of the central magnet and the side magnet, and the outer peripheral wall of the second yoke plate is respectively attached to the side wall of the central magnet and the common magnet; And / or, the first yoke plate and the second yoke plate are provided with recessed grooves extending along the first direction corresponding to the magnetic gap, and the recessed grooves are used to avoid the voice coil.

4. The sound-generating device as described in claim 1, characterized in that, The side magnets form a closed, integrated ring structure and are arranged around the central magnet and the common magnet; or, the side magnets include multiple side magnets, with adjacent side magnets connected end to end to form a closed ring structure and arranged around the central magnet and the common magnet; or, the side magnets include multiple side magnets, with multiple side magnets spaced apart and arranged around the central magnet and the common magnet, so that a first gap is formed between adjacent side magnets. And / or, the common magnet extends along a third direction perpendicular to the second direction and is connected to the side magnet; wherein the side magnet and the common magnet are integrally formed.

5. The sound-generating device as described in claim 1, characterized in that, The magnetic circuit system further includes a magnetic guide plate assembly, which includes a side magnetic guide plate, a common magnetic guide plate, and two central magnetic guide plates. Each central magnetic guide plate is disposed on the side of a central magnet facing away from the magnetic guide yoke. The side magnetic guide plate is disposed on the side of the side magnet facing away from the magnetic guide yoke. The common magnetic guide plate is disposed on the side of the common magnet facing away from the magnetic guide yoke. Wherein, the side magnetic plates form a closed, integral ring structure; or, the side magnetic plates include multiple ones, with adjacent side magnetic plates connected end to end to form a closed ring structure; or, the side magnetic plates include multiple ones, with the multiple side magnetic plates spaced apart to form a second gap between adjacent side magnetic plates.

6. The sound-generating device as described in claim 5, characterized in that, The sound-generating device also includes a housing, the outer periphery of the diaphragm assembly is connected to one end of the housing, and the magnetic circuit system is connected to the other end of the housing; The side magnetic plate and the outer shell are integrally formed. And / or, the outer shell is square, the side magnetic plate is connected to the outer shell, and the side magnetic plate is provided with sound-transmitting holes at the four corners of the outer shell, which are respectively arranged opposite to the diaphragm assembly.

7. The sound-generating device as described in claim 5, characterized in that, The common magnetic conductive plate extends along a third direction perpendicular to the second direction and is connected to the side magnetic conductive plate; wherein the side magnetic conductive plate and the common magnetic conductive plate are integrally formed.

8. The sound-generating device as claimed in claim 1, characterized in that, The inner ring portion forms a hollow hole, and the dome is connected to the inner ring portion and covers the hollow hole.

9. The sound-generating device as described in claim 8, characterized in that, The dome is provided with a protrusion extending toward the magnetic circuit system, and the protrusion is connected to the voice coil; And / or, the sound-generating device further includes a housing, the outer periphery of the diaphragm assembly is connected to one end of the housing, and the magnetic circuit system is connected to the other end of the housing; wherein, the housing is provided with a conductive element, and the conductive layer is connected and conductive to the conductive element.

10. An electronic device, characterized in that, The electronic device includes a sound-generating device as described in any one of claims 1 to 9.

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