Sound production apparatus and electronic device

Abstract

The present invention relates to the technical field of electroacoustic transduction. Disclosed are a sound production apparatus and an electronic device. The sound production apparatus comprises a housing, a magnetic circuit system, and a vibration system; in the magnetic circuit system, a bass magnetic circuit portion is provided with a first bass magnetic gap and a second bass magnetic gap, and a treble magnetic circuit portion is located on the outer side of an edge magnetic portion; a first bass voice coil of a bass vibration unit in the vibration system is arranged corresponding to the first bass magnetic gap, a second bass voice coil is arranged corresponding to the second bass magnetic gap, and a treble vibration unit is connected to the housing and is arranged opposite to and spaced apart from the treble magnetic circuit portion; the bass vibration unit has a bass radiation surface, the treble vibration unit has a treble radiation surface, and the bass radiation surface and the treble radiation surface are arranged at an included angle. The sound production apparatus of the present invention effectively improves the utilization rate of the magnetic circuit system and increases an BL value, thereby enhancing the loudness and sensitivity of the sound production apparatus, and realizing full-frequency and miniaturization.

Description

Sound production device and electronic device TECHNICAL FIELD

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

[0002] In recent years, convenient electronic devices (such as mobile phones, earphones, and computers) have penetrated into people's daily life. With the rapid development of technology, people's demand for the sound quality of electronic devices is also getting higher and higher, and the full-frequency and miniaturization of loudspeakers have become mainstream requirements.

[0003] In related technologies, a common full-frequency solution is to assemble a low-frequency loudspeaker and a high-frequency loudspeaker in an electronic device at the same time, but due to the space limitation of the electronic device, the size of the two units is limited, which affects the full-frequency effect of the loudspeaker, resulting in low performance and unable to achieve better sound quality. At the same time, a single voice coil solution is usually used in the low-frequency loudspeaker, and the utilization rate of the magnetic field generated by the voice coil to the magnetic circuit system is not high, and the vibration effect of the voice coil driving the diaphragm is also not ideal, thereby reducing the BL value of the low-frequency loudspeaker, and the magnetic energy utilization rate of the central magnetic middle region in the magnetic circuit system is low, which is not effectively utilized, thereby affecting the loudness and sensitivity of the low-frequency loudspeaker. SUMMARY

[0004] The main purpose of the present application is to provide a sound production device and an electronic device, which aims to provide a sound production device with high magnetic field utilization rate. The sound production device integrates low-frequency and high-frequency units in one body, occupies less space, has higher overall space adaptability, optimizes the magnetic circuit system, and uses double voice coils to further improve the utilization rate of the magnetic circuit system and the BL value, thereby improving the loudness and sensitivity of the sound production device.

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

[0006] a shell;

[0007] a magnetic circuit system connected with the shell, the magnetic circuit system comprising a low-frequency magnetic circuit part and a high-frequency magnetic circuit part, the low-frequency magnetic circuit part having a first low-frequency magnetic gap and a second low-frequency magnetic gap, and the high-frequency magnetic circuit part being located outside the edge magnetic part; and

[0008] A vibration system includes a low-frequency vibration unit and a high-frequency vibration unit, the low-frequency vibration unit includes a low-frequency diaphragm, and a first low-frequency voice coil and a second low-frequency voice coil connected to the low-frequency diaphragm, the first low-frequency voice coil is arranged corresponding to the first low-frequency magnetic gap, the second low-frequency voice coil is arranged corresponding to the second low-frequency magnetic gap, the high-frequency vibration unit is connected to the shell and is arranged opposite and spaced apart from the high-frequency magnetic circuit part.

[0009] The low-frequency vibration unit has a low-frequency radiation surface, and the high-frequency vibration unit has a high-frequency radiation surface, and the low-frequency radiation surface is arranged at an angle with the high-frequency radiation surface.

[0010] In an embodiment, the shell includes a frame body and a mounting side wall, the mounting side wall is arranged on one side of the frame body and encloses the frame body to form a mounting space, and the mounting side wall is provided with a mounting hole communicating with the mounting space;

[0011] The periphery of the low-frequency diaphragm is connected to one end of the frame body, the low-frequency magnetic circuit part and the high-frequency magnetic circuit part are arranged in the mounting space, the high-frequency magnetic circuit part is arranged corresponding to the mounting hole, and the high-frequency vibration unit is connected to the mounting side wall and covers the mounting hole.

[0012] In an embodiment, the high-frequency magnetic circuit part includes a first magnet, a second magnet and a third magnet arranged in the mounting space, the first magnet, the second magnet and the third magnet are arranged in a direction parallel to the high-frequency radiation surface, the first magnet is away from the low-frequency diaphragm, and the third magnet is connected to the frame body.

[0013] The high-frequency vibration unit includes a high-frequency diaphragm and a high-frequency voice coil connected to the high-frequency diaphragm, the high-frequency diaphragm is connected to the mounting side wall and covers the mounting hole, and the high-frequency voice coil is located in the mounting hole and arranged opposite and spaced apart from the high-frequency magnetic circuit part.

[0014] In an embodiment, the first magnet, the second magnet and the third magnet are magnetized in a direction perpendicular to the high-frequency radiation surface, and the magnetization direction of the second magnet is opposite to the magnetization directions of the first magnet and the third magnet.

[0015] Alternatively, the second magnet is magnetized in a direction perpendicular to the high-frequency radiation surface, the first magnet and the third magnet are magnetized in a direction parallel to the high-frequency radiation surface, and the magnetization direction of the first magnet is opposite to the magnetization direction of the third magnet, and the magnetic pole of the first magnet close to the side of the second magnet is the same as the magnetic pole of the second magnet close to the side of the high-frequency radiation surface.

[0016] And / or, the high-pitched diaphragm is a planar diaphragm, and a material of the planar diaphragm is any one of PEN, LCP, PEEK, carbon paper, and magnesium-lithium alloy;

[0017] And / or, the high-pitched voice coil is fixed to one side of the high-pitched diaphragm facing the high-pitched magnetic circuit part, the high-pitched voice coil is a flat voice coil formed by winding enameled wire, and a central axis of the flat voice coil is perpendicular to the high-pitched radiation surface; or the high-pitched voice coil includes a coil structure formed by a circuit board and a conductive circuit disposed on the circuit board.

[0018] And / or, the high-pitched diaphragm is a planar diaphragm, and a center region of the high-pitched diaphragm is provided with a reinforcing part.

[0019] In an embodiment, the bass magnetic circuit part includes a center magnetic part, a common magnetic part, and an edge magnetic part provided in a magnetic yoke, the common magnetic part is located outside the center magnetic part and spaced from the center magnetic part to form a first bass magnetic gap, the edge magnetic part is located outside the common magnetic part and spaced from the common magnetic part to form a second bass magnetic gap, and the high-pitched magnetic circuit part is located outside the edge magnetic part.

[0020] In an embodiment, the center magnetic part includes a first center magnet, a center magnetic plate, and a second center magnet stacked, the common magnetic part includes a first common magnet, a common magnetic plate, and a second common magnet stacked, and the edge magnetic part includes an edge magnet and an edge magnetic plate stacked, and the edge magnetic plate is connected with the shell.

[0021] The first center magnet, the center magnetic plate, and the second center magnet correspond to the first common magnet, the common magnetic plate, and the second common magnet, respectively, in a direction parallel to the bass radiation surface.

[0022] The bass diaphragm is provided with an inner ring hole in the center, the outer periphery of the bass diaphragm is connected with the shell, the inner periphery of the bass diaphragm is connected with the bass magnetic circuit part, and the top surface height of the diaphragm is lower than the top surface height of the bass magnetic circuit part.

[0023] In an embodiment, the first center magnet and the second center magnet are magnetized in the vibration direction of the bass diaphragm, and the magnetic poles of the first center magnet and the second center magnet close to the center magnetic plate are the same.

[0024] The first common magnet and the second common magnet are magnetized in the vibration direction of the bass diaphragm, and the magnetic poles of the first common magnet and the second common magnet close to the common magnetic plate are the same, and the edge magnet is magnetized in the vibration direction of the bass diaphragm.

[0025] The magnetic poles of the first and second center magnets near the center magnetic plate are opposite to the magnetic poles of the first and second common magnets near the common magnetic plate.

[0026] The magnetic poles of the edge magnets near the edge magnetic plate are the same as the magnetic poles of the first center magnets near the center magnetic plate, and the magnetic poles of the edge magnets near the edge magnetic plate are opposite to the magnetic poles of the first common magnets near the common magnetic plate.

[0027] In an embodiment, the magnetic yoke comprises a first magnetic yoke and a second magnetic yoke, the first center magnet, the first common magnet and the edge magnet are connected with the first magnetic yoke, and the second center magnet and the second common magnet are connected with the second magnetic yoke.

[0028] The inner periphery of the bass diaphragm is connected with the second magnetic yoke, so that part of the second magnetic yoke corresponds to the inner ring hole.

[0029] In an embodiment, the bass diaphragm comprises an inner ring part, a first folded ring arranged around the inner ring part, a flat part arranged around the first folded ring, a second folded ring arranged around the flat part, and a fixed part connected to the outside of the second folded ring, the fixed part is connected to the shell, the inner ring part forms the inner ring hole, and the inner ring part is connected with the periphery of the second magnetic yoke.

[0030] In an embodiment, the inner ring part, the first folded ring, the flat part, the second folded ring and the fixed part are integrally formed;

[0031] And / or, the top surface height of the edge magnetic part is lower than the top surface height of the common magnetic part, the protruding direction of the first folded ring is away from the magnetic circuit system, the protruding direction of the second folded ring is opposite to that of the first folded ring, the first folded ring is at least partially opposite to the second magnetic gap, and the second folded ring is at least partially opposite to the edge magnetic circuit part.

[0032] And / or, the second common magnet is provided with a avoiding structure adjacent to the periphery of the second bass magnetic gap.

[0033] And / or, the second magnetic yoke comprises a protruding part and an edge part connected to the protruding part, the inner ring part is connected with the edge part, so that the protruding part passes through the inner ring hole, the protruding part faces the center magnetic part to form a recessed groove, the second center magnet has a protruding part protruding from the second common magnet, and the protruding part is accommodated and limited in the recessed groove.

[0034] In an embodiment, the common magnetic part is provided with an avoiding gap communicating the first bass magnetic gap and the second bass magnetic gap.

[0035] The bass vibration unit further comprises a skeleton, the skeleton comprising a main body part connected with the bass diaphragm and a connecting part in the avoiding gap, two ends of the connecting part being connected with the first bass voice coil and the second bass voice coil respectively.

[0036] In an embodiment, an avoiding space is formed between the side magnetic part and the shell;

[0037] The bass vibration unit further comprises a centering support, one end of the centering support being connected with the shell, and the other end of the centering support being located in the avoiding space;

[0038] The skeleton further comprises an extension part, one end of the extension part being connected with the periphery of the main body part, and the other end of the extension part extending towards the centering support and being connected with the centering support.

[0039] In an embodiment, the main body part is arranged in a rectangular ring, the connecting part comprises a plurality of connecting parts, the plurality of connecting parts being arranged at four corner positions of the main body part respectively, and the shared magnetic part is provided with one avoiding gap corresponding to each connecting part;

[0040] And / or, the two ends of the connecting part are respectively provided with a first connecting surface and a second connecting surface, the first connecting surface being connected with the first bass voice coil, and the second connecting surface being connected with the second bass voice coil;

[0041] And / or, the shell has two long sides and two short sides connected in a head-to-tail manner, the centering support comprises two centering supports, the two centering supports being arranged symmetrically and corresponding to the two short sides respectively, and the high pitch magnetic circuit part and the high pitch vibration unit being arranged corresponding to the long sides.

[0042] In an embodiment, the size of the sound generating device along the vibration direction of the bass vibration unit is smaller than the size of the sound generating device along the vibration direction of the high pitch diaphragm unit.

[0043] In an embodiment, the sound generating device is mounted in a shell of a sound generating module, and a bass front cavity, a high pitch front cavity and a rear cavity are formed between the sound generating device and the shell, the shell being provided with a bass sound outlet hole communicating with the bass front cavity and a high pitch sound outlet hole communicating with the high pitch front cavity, sound waves of the bass diaphragm being radiated to the outside through the bass sound outlet hole, and sound waves of the high pitch radiation surface being radiated to the outside through the high pitch sound outlet hole;

[0044] The volume of the rear cavity is ≤1.5cc.

[0045] The application further provides an electronic device comprising the sound production device.

[0046] The sound production device of the application integrates the low-pitch unit and the high-pitch unit by connecting the periphery of the low-pitch diaphragm to the shell and connecting the high-pitch unit to the shell and arranging the high-pitch unit opposite to the high-pitch magnetic circuit part; the first low-pitch voice coil and the second low-pitch voice coil of the low-pitch unit are arranged in the first low-pitch magnetic gap and the second low-pitch magnetic gap of the low-pitch magnetic circuit part of the magnetic circuit system, respectively, to form a double voice coil structure; the low-pitch radiation surface of the low-pitch unit and the high-pitch radiation surface of the high-pitch unit are arranged at an angle, so that the low-pitch sound production and the high-pitch sound production do not interfere with each other, thereby improving the sound production effect. BRIEF DESCRIPTION OF DRAWINGS

[0047] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only show some embodiments of the application, and for those skilled in the art, other drawings can also be obtained from the drawings shown without creative labor.

[0048] Fig. 1 is a structural schematic diagram of an embodiment of the sound production device provided by the application;

[0049] Fig. 2 is a sectional schematic diagram of an embodiment of the sound production device provided by the application;

[0050] Fig. 3 is an exploded schematic diagram of an embodiment of the sound production device provided by the application;

[0051] Fig. 4 is a partial structural schematic diagram of an embodiment of the sound production device provided by the application;

[0052] Fig. 5 is an exploded schematic diagram of an embodiment of the low-pitch magnetic circuit part provided by the application;

[0053] Fig. 6 is a structural schematic diagram of an embodiment of the low-pitch diaphragm provided by the application;

[0054] Fig. 7 is a structural schematic diagram of an embodiment of the framework provided by the application;

[0055] Fig. 8 is a structural schematic diagram of an embodiment of the sound production module provided by the present application;

[0056] Fig. 9 is an exploded schematic diagram of an embodiment of the sound production module provided by the present application;

[0057] Fig. 10 is a cross-sectional schematic diagram of an embodiment of the sound production module provided by the present application;

[0058] Fig. 11 is a cross-sectional schematic diagram of an embodiment of the sound production module provided by the present application from another perspective.

[0059] BRIEF DESCRIPTION OF THE DRAWINGS 100, sound production device; 1, housing; 11, frame body; 111, long side; 112, short side; 113, avoidance space; 12, mounting side wall; 121, mounting space; 122, mounting hole; 2, magnetic circuit system; 21, bass magnetic circuit part; 211, magnetic yoke; 2111, first magnetic yoke; 2112, second magnetic yoke; 2113, protruding part; 2114, edge part; 2115, recessed groove; 212, center magnetic part; 2121, first center magnet; 2122, center magnetic conducting plate; 2123, second center magnet; 2124, protruding part; 213, shared magnetic part; 2131, first shared magnet; 2132, shared magnetic conducting plate; 2133, second shared magnet; 2134, avoidance structure; 2135, avoidance gap; 214, edge magnetic part; 2141, edge magnet; 2142, edge magnetic conducting plate; 215, first bass magnetic gap; 216, second bass magnetic gap; 22, treble magnetic circuit part; 221, first magnet; 222, second magnet; 223, third magnet; 3, vibration system; 31, bass vibration unit; 311, bass diaphragm; 3111, inner ring part; 3112, inner ring hole; 3113, first folded ring; 3114, flat part; 3115, second folded ring; 3116, fixed part; 3117, bass radiation surface; 312, first bass voice coil; 313, second bass voice coil; 314, skeleton; 3141, main body part; 3142, connecting part; 3143, extension part; 3144, first connecting surface; 3145, second connecting surface; 315, centering branch; 32, treble vibration unit; 321, treble diaphragm; 322, treble voice coil; 323, treble radiation surface; 400, housing; 411, bass sound hole; 412, treble sound hole; 413, treble sound guide; 414, upper housing; 415, lower housing; 421, bass front cavity; 422, treble front cavity; 430, rear cavity; 500, sound production module.

[0060] 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

[0061] With reference to the accompanying drawings, the technical solutions in the embodiments of the present application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort are within the scope of the present application.

[0062] It should be noted that all directional indications, such as upper, lower, left, right, front, back, and the like, are only used to explain the relative position relationship, movement condition and the like between components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications also change accordingly.

[0063] Meanwhile, "and / or" or "and / or" appearing throughout the text means including three schemes. Taking "A and / or B" as an example, it includes A scheme, or B scheme, or A and B schemes.

[0064] 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 scope of protection claimed by the present application.

[0065] In recent years, convenient electronic devices (such as mobile phones, earphones, computers) have penetrated into people's daily life. With the rapid development of technology, people's demand for the sound quality of electronic devices is also getting higher and higher, and the full frequency and miniaturization of loudspeakers have become mainstream demand. With the multi-function and miniaturization design of portable terminal electronic products, higher requirements are put forward for the vibration acoustic performance of micro sound generating devices. Generally, sound generating devices generally include a magnetic circuit system and a vibration system, wherein the vibration system includes a diaphragm and a voice coil combined on one side of the diaphragm. The energized voice coil can drive the diaphragm to vibrate under the action of the magnetic circuit system, thereby realizing sound generation of the sound generating device.

[0066] In the related art, a common full-frequency scheme is to assemble a woofer and a tweeter in an electronic device at the same time, but the space of the electronic device is limited, the size of the two units is limited, the full-frequency effect of the loudspeaker is affected, the performance is low, and better sound quality cannot be achieved. At the same time, a single voice coil scheme is usually used in a small back cavity sound generating device (usually the back cavity is less than 1.5cc), the utilization rate of the magnetic field generated by the voice coil to the magnetic circuit system is not high, and the vibration effect of the voice coil driving the diaphragm is not ideal, thereby reducing the BL value of the woofer, and the magnetic energy utilization rate of the middle region of the center magnet in the magnetic circuit system is low, which is not effectively utilized, thereby affecting the loudness and sensitivity of the woofer. The loudness of the micro sound generating device cannot meet the demand in general, so it is an important work to further improve the utilization rate of the magnet and improve the sensitivity of the sound generating device.

[0067] Based on the above ideas and problems, 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, a computer, a headset, a watch, etc., which is not limited here.

[0068] Please refer to FIG. 1 to FIG. 7, in the embodiment of the present application, the sound generating device 100 includes a shell 1, a magnetic circuit system 2 and a vibration system 3, the magnetic circuit system 2 is connected with the shell 1, the magnetic circuit system 2 includes a woofer magnetic circuit part 21 and a tweeter magnetic circuit part 22, the woofer magnetic circuit part 21 has a first woofer magnetic gap 215 and a second woofer magnetic gap 216, the tweeter magnetic circuit part 22 is located outside the woofer magnetic circuit part 21, the vibration system 3 includes a woofer vibration unit 31 and a tweeter vibration unit 32, the woofer vibration unit 31 includes a woofer diaphragm 311 and a first woofer voice coil 312 and a second woofer voice coil 313 connected to the woofer diaphragm 311, the first woofer voice coil 312 is arranged corresponding to the first woofer magnetic gap 215, the second woofer voice coil 313 is arranged corresponding to the second woofer magnetic gap 216, the tweeter vibration unit 32 is connected to the shell 1 and is arranged opposite and spaced apart from the tweeter magnetic circuit part 22; wherein the woofer vibration unit 31 has a woofer radiation surface 3117, the tweeter vibration unit 32 has a tweeter radiation surface 323, the woofer radiation surface 3117 and the tweeter radiation surface 323 are arranged at an included angle.

[0069] In the embodiment, the shell 1 is used for mounting, fixing, supporting and protecting the vibration system 3, the magnetic circuit system 2 and the like, that is, the shell 1 provides a mounting base for the vibration system 3, the magnetic circuit system 2 and the like. It can be understood that the shell 1 can be a mounting shell, a housing or a box structure having a mounting cavity, that is, the shell 1 defines a receiving space, which is not limited herein. Alternatively, the shell 1 has a rectangular structure, the shell 1 has two opposite long edges 111 and two short edges 112, the two ends of the short edge 112 are connected to the two long edges 111 respectively, and the two ends of the long edge 111 are connected to the two short edges 112 respectively, so that the shell 1 defines a receiving space.

[0070] It can be understood that when the shell 1 is a metal piece, the magnetic circuit system 2 and the shell 1 are fixed by bonding or welding. In another embodiment, when the shell 1 is injection molded by plastic, the edge magnetic plate 2142 of the magnetic circuit system 2 is first injection molded in the shell 1 as an insert, or the magnetic circuit system 2 and the shell 1 are fixed by bonding, and then the other parts are fixed by bonding, which is not limited herein.

[0071] In the embodiment, the magnetic circuit system 2 is arranged in the receiving space and connected to the shell 1. It can be understood that by setting the bass magnetic circuit part 21 of the magnetic circuit system 2 to have a first bass magnetic gap 215 and a second bass magnetic gap 216, and setting the bass vibration unit 31 of the vibration system 3 to have a bass diaphragm 311 and a first bass voice coil 312 and a second bass voice coil 313 connected to the bass diaphragm 311, the first bass voice coil 312 of the bass vibration unit 31 is arranged corresponding to the first bass magnetic gap 215, and the second bass voice coil 313 is arranged corresponding to the second bass magnetic gap 216, forming a double voice coil structure. At the same time, the treble magnetic circuit part 22 of the magnetic circuit system 2 is located outside the edge magnetic part 214, and the treble vibration unit 32 of the vibration system 3 is connected to the shell 1 and arranged opposite and spaced apart from the treble magnetic circuit part 22, so as to integrate the bass and treble units into one, so as to occupy less space, have higher overall space adaptability, realize full frequency and miniaturization of the sound generating device 100, and by optimizing the bass magnetic circuit part 21 of the magnetic circuit system 2, the bass vibration unit 31 adopts inner and outer double voice coils to further improve the utilization rate of the magnetic circuit system 2 and improve the BL value, thereby improving the loudness and sensitivity of the sound generating device 100.

[0072] In an embodiment, the bass magnetic circuit part 21 includes a magnetic yoke 211, a center magnetic part 212, a shared magnetic part 213 and an edge magnetic part 214 arranged in the center magnetic part 212, the shared magnetic part 213 is located outside the center magnetic part 212 and spaced apart from the center magnetic part 212 to form a first bass magnetic gap 215, the edge magnetic part 214 is located outside the shared magnetic part 213 and spaced apart from the shared magnetic part 213 to form a second bass magnetic gap 216, and the treble magnetic circuit part 22 is located outside the edge magnetic part 214.

[0073] In the present embodiment, the first bass voice coil 312 and the second bass voice coil 313 are annular track voice coils, one end of the first bass voice coil 312 and the second bass voice coil 313 is connected with the bass diaphragm 311, and the other end of the first bass voice coil 312 and the second bass voice coil 313 is respectively suspended in the first bass magnetic gap 215 and the second bass magnetic gap 216, which is not limited herein.

[0074] It should be noted that by passing current to the first bass voice coil 312 and the second bass voice coil 313, the first bass voice coil 312 and the second bass voice coil 313 transmit electrical energy to the first bass magnetic gap 215 and the second bass magnetic gap 216 of the bass magnetic circuit part 21, so that the magnetic field generated by the magnetic circuit system 2 converts electrical energy into mechanical energy, thereby causing the first bass voice coil 312 and the second bass voice coil 313 to vibrate and simultaneously driving the bass diaphragm 311 to vibrate and sound, and further converting mechanical energy into sound energy.

[0075] It can be understood that the first bass voice coil 312 arranged in the first bass magnetic gap 215 receives an external alternating current signal, and under the driving of the magnetic field force of the bass magnetic circuit part 21 of the magnetic circuit system 2, the first bass voice coil 312 makes reciprocating motion of cutting magnetic lines, thereby driving the bass diaphragm 311 of the bass vibration unit 31 of the vibration system 3 to vibrate and sound. At the same time, the second bass voice coil 313 receives the transmitted alternating current signal, and under the driving of the magnetic field force of the bass magnetic circuit part 21 of the magnetic circuit system 2 at the second bass magnetic gap 216, the second bass voice coil 313 makes reciprocating motion of cutting magnetic lines, thereby fully utilizing the magnetic field of the magnetic circuit system 2, so that the first bass voice coil 312 and the second bass voice coil 313 cooperate to improve the driving force on the bass diaphragm 311, thereby effectively improving the BL value of the sound generating device 100 and improving the vibration effect of the bass diaphragm 311.

[0076] In the present embodiment, the first bass voice coil 312 and the second bass voice coil 313 can be connected in series or in parallel through a conductive structure, which is not limited herein. In order to realize the electrical connection between the first bass voice coil 312 and the second bass voice coil 313 and the external circuit. In an embodiment, the vibration system 3 further comprises a centering branch or a connecting piece or a skeleton 314, one end of the centering branch or the connecting piece or the skeleton 314 is connected to the first bass voice coil 312 and the second bass voice coil 313, and the other end of the centering branch or the connecting piece or the skeleton 314 is connected to the housing 1.

[0077] It can be understood that the centering branch is taken as an example, and two ends of the centering branch are respectively electrically connected with the lead wires of the first bass voice coil 312 and the second bass voice coil 313 and an external circuit. In the embodiment, the centering branch can be arranged at the bottom of the first bass voice coil 312 and the second bass voice coil 313, and the centering branch is located at the four corner positions of the sound production device 100 or the short axis or long axis direction of the sound production device 100. Of course, the centering branch can also be arranged at the top of the first bass voice coil 312 and the second bass voice coil 313, and the centering branch is located between the first bass voice coil 312 and the second bass voice coil 313 and the bass diaphragm 311, which is not limited herein.

[0078] In an embodiment, the current direction in the second bass voice coil 313 is opposite to the current direction in the first bass voice coil 312. It can be understood that the current directions in the second bass voice coil 313 and the first bass voice coil 312 are counterclockwise and clockwise respectively. Such an arrangement can ensure that the vibration direction generated by the first bass voice coil 312 in the first bass magnetic gap 215 is the same as the vibration direction generated by the second bass voice coil 313 in the second bass magnetic gap 216, thereby ensuring that the same direction vibration is generated on the bass diaphragm 311 at the same time to improve the vibration effect on the bass diaphragm 311.

[0079] In the embodiment, the magnetic yoke 211 of the bass magnetic circuit part 21 in the magnetic circuit system 2 is opposite to the bass diaphragm 311, the center magnetic part 212, the shared magnetic part 213 and the side magnetic part 214 are arranged on the side of the magnetic yoke 211 facing the bass diaphragm 311, and the bass magnetic circuit part 21 can be connected with the shell 1 through the side magnetic part 214 and / or the magnetic yoke 211.

[0080] Alternatively, the magnetic yoke 211 can be a magnetic plate or a magnetic pot rack structure, which is not limited herein. The magnetic yoke 211 is used to support and fix the center magnetic part 212, the shared magnetic part 213 and the side magnetic part 214. In the embodiment, the magnetic yoke 211 is adhesively connected with the center magnetic part 212, the shared magnetic part 213 and the side magnetic part 214, and the side magnetic part 214 is adhesively connected with the shell 1.

[0081] It can be understood that by arranging the treble magnetic circuit part 22 outside the side magnetic part 214, and connecting the treble vibration unit 32 to the shell 1 and oppositely and spacedly arranging the treble magnetic circuit part 22, the treble magnetic circuit part 22 is used to drive the treble vibration unit 32 to vibrate and produce sound, and at the same time, the bass radiation surface 3117 of the bass vibration unit 31 and the treble radiation surface 323 of the treble vibration unit 32 are arranged at an angle, so that the bass sound production and the treble sound production of the sound production device 100 do not interfere with each other, thereby improving the sound production effect.

[0082] In an embodiment, as shown in FIGS. 1-3 and 6, the low-frequency diaphragm 311 is provided with an inner ring hole 3112, the outer periphery of the low-frequency diaphragm 311 is connected with the shell 1, the inner periphery of the low-frequency diaphragm 311 is connected with the low-frequency magnetic circuit portion 21, and the top surface height of the diaphragm 31 is lower than the top surface height of the low-frequency magnetic circuit portion 21.

[0083] It can be understood that, by setting the low-frequency diaphragm 311 as a ring structure, connecting the inner periphery of the low-frequency diaphragm 311 with the magnetic circuit system 2, connecting part of the magnetic circuit system 2 with the inner ring hole 3112, and setting the top surface height of the diaphragm 31 to be lower than the top surface height of the low-frequency magnetic circuit portion 21, when the sound production device 100 is applied to a module or electronic equipment, the magnetic circuit system 2 of the sound production device 100 can be used to abut against the inner wall of the shell of the electronic equipment, so that a low-frequency front cavity is formed between the low-frequency diaphragm 311 and the shell, that is, no additional front cavity space is needed, and the height difference between the magnetic circuit system 2 and the low-frequency diaphragm 311 in the vibration system 3 can be used to form a front cavity structure, thereby effectively reducing the height of the electronic equipment Z.

[0084] The sound production device 100 of the present application connects the magnetic circuit system 2 with one end of the shell 1, sets the magnetic circuit system 2 as the low-frequency magnetic circuit portion 21 and the high-frequency magnetic circuit portion 22, sets the vibration system 3 as the low-frequency vibration unit 31 and the high-frequency vibration unit 32, connects the periphery of the low-frequency diaphragm 311 with the shell 1, connects the high-frequency vibration unit 32 with the shell 1, and sets the high-frequency vibration unit 32 opposite and spaced apart from the high-frequency magnetic circuit portion 22, thereby realizing the integration of the low-frequency and high-frequency units; at the same time, by setting the low-frequency magnetic circuit portion 21 of the magnetic circuit system 2 as the magnetic yoke 211, the center magnetic portion 212, the shared magnetic portion 213 and the side magnetic portion 214 arranged on the magnetic yoke 211, the shared magnetic portion 213 is arranged outside and spaced apart from the center magnetic portion 212 to form the first low-frequency magnetic gap 215, and the side magnetic portion 214 is arranged outside and spaced apart from the shared magnetic portion 213 to form the second low-frequency magnetic gap 216, thereby corresponding the first low-frequency voice coil 312 of the low-frequency vibration unit 31 in the vibration system 3 with the first low-frequency magnetic gap 215, and corresponding the second low-frequency voice coil 313 with the second low-frequency magnetic gap 216, forming an inner-outer double voice coil structure, so that the current is passed through the first low-frequency voice coil 312 and the second low-frequency voice coil 313, so that the two voice coils vibrate in the magnetic field of the first low-frequency magnetic gap 215 and the second low-frequency magnetic gap 216 formed by the low-frequency magnetic circuit portion 21 of the magnetic circuit system 2, and drive the low-frequency diaphragm 311 to produce sound, so as to improve the BL value; further, by setting the low-frequency radiation surface 3117 formed by the low-frequency vibration unit 31 and the high-frequency radiation surface 323 formed by the high-frequency vibration unit 32 as an included angle, the low-frequency sound production and the high-frequency sound production of the sound production device 100 do not interfere with each other, thereby improving the sound production effect.

[0085] In an embodiment, the housing 1 comprises a frame body 11 and a mounting side wall 12, the mounting side wall 12 is arranged at one side of the frame body 11 and encloses the frame body 11 to form a mounting space 121, the mounting side wall 12 is provided with a mounting hole 122 communicating with the mounting space 121; the periphery of the bass diaphragm 311 is connected to one end of the frame body 11, the bass magnetic circuit part 21 and the treble magnetic circuit part 22 are arranged in the mounting space 121, the treble magnetic circuit part 22 is arranged corresponding to the mounting hole 122, and the treble vibration unit 32 is connected to the mounting side wall 12 and covers the mounting hole 122.

[0086] In the embodiment, as shown in FIGS. 1-4, the housing 1 is arranged as the frame body 11 and the mounting side wall 12, so that the frame body 11 is a square or rectangular frame body, thereby realizing mounting and fixing of the bass magnetic circuit part 21 of the magnetic circuit system 2 and the bass vibration unit 31 of the vibration system 3 by the frame body 11, and the mounting side wall 12 is arranged at one side of the frame body 11 and encloses the outer wall of the frame body 11 to form the mounting space 121, and the mounting hole 122 is arranged on the mounting side wall 12 and communicates with the mounting space 121, so that the mounting side wall 12 and the frame body 11 form the mounting space 121 to realize mounting and fixing of the treble magnetic circuit part 22 of the magnetic circuit system 2, and the mounting side wall 12 realizes mounting and fixing of the treble vibration unit 32 of the vibration system 3.

[0087] It can be understood that the plane where the frame body 11 is connected to the bass diaphragm 311 of the bass vibration unit 31 and the plane where the mounting side wall 12 is connected to the treble vibration unit 32 are arranged at an angle, so that the bass radiation surface 3117 of the bass vibration unit 31 and the treble radiation surface 323 of the treble vibration unit 32 are arranged at an angle. Alternatively, the bass radiation surface 3117 and the treble radiation surface 323 are arranged vertically.

[0088] In the embodiment, as shown in FIGS. 1-4, the bass diaphragm 311 of the bass vibration unit 31 in the vibration system 3 vibrates in the vertical direction, that is, the bass radiation surface 3117 of the bass vibration unit 31 is arranged horizontally (i.e., perpendicular to the vertical direction), and the bass vibration unit 31 radiates sound waves in the vertical direction, and the treble vibration unit 32 in the vibration system 3 vibrates in the horizontal direction, that is, the treble radiation surface 323 of the treble vibration unit 32 is arranged vertically (i.e., perpendicular to the horizontal direction), and the treble vibration unit 32 radiates sound waves in the horizontal direction.

[0089] In an embodiment, the high-frequency magnetic circuit portion 22 comprises a first magnet 221, a second magnet 222 and a third magnet 223 arranged in the mounting space 121, the first magnet 221, the second magnet 222 and the third magnet 223 are arranged in a direction parallel to the high-frequency radiation surface 323, the first magnet 221 is away from the low-frequency diaphragm 31, and the third magnet 223 is connected to the frame body 11; the high-frequency vibration unit 32 comprises a high-frequency diaphragm 321 and a high-frequency voice coil 322 connected to the high-frequency diaphragm 321, the high-frequency diaphragm 321 is connected to the mounting side wall 12 and covers the mounting hole 122, and the high-frequency voice coil 322 is located in the mounting hole 122 and is arranged opposite and spaced apart from the high-frequency magnetic circuit portion 22.

[0090] In the embodiment, as shown in FIGS. 2 to 4, by arranging the high-frequency magnetic circuit portion 22 as the first magnet 221, the second magnet 222 and the third magnet 223 arranged in a stack, the first magnet 221, the second magnet 222 and the third magnet 223 are arranged in a direction parallel to the high-frequency radiation surface 323, so that the high-frequency diaphragm 321 and the high-frequency voice coil 322 of the high-frequency vibration unit 32 are arranged opposite and spaced apart from the first magnet 221, the second magnet 222 and the third magnet 223.

[0091] Optionally, the high-frequency voice coil 322 is a ring-shaped planar voice coil. In the embodiment, the high-frequency voice coil 322 has two long-axis sides and two short-axis sides connected end to end. Optionally, the two long-axis sides or the two short-axis sides of the high-frequency voice coil 322 correspond to the connection between the first magnet 221 and the second magnet 222 and the connection between the second magnet 222 and the third magnet 223, respectively, so that the magnetic lines generated by the high-frequency magnetic circuit portion 22 smoothly pass through the two long-axis sides or the two short-axis sides of the high-frequency voice coil 322.

[0092] In the embodiment, the high-frequency diaphragm 321 is a planar diaphragm, and the high-frequency voice coil 322 is fixed to one side of the high-frequency diaphragm 321 facing the high-frequency magnetic circuit portion 22 and is opposite and spaced apart from the high-frequency magnetic circuit portion 22.

[0093] In an embodiment, the high-frequency diaphragm 321 is a planar diaphragm, and the material of the planar diaphragm is any one of PEN, LCP, PEEK, carbon paper and magnesium-lithium alloy. In the embodiment, the planar diaphragm has a simple manufacturing process and reduces production cost. Optionally, the material of the planar diaphragm is any one of PEN, LCP, PEEK, carbon paper and magnesium-lithium alloy, the above-mentioned materials have high rigidity and small density, the planar diaphragm made of the above-mentioned materials has light weight, and the sound performance of the planar diaphragm is improved.

[0094] Optionally, the high-frequency diaphragm 321 is a planar diaphragm, and a reinforcing portion is arranged at a center region of the high-frequency diaphragm 321. It can be understood that, by arranging the reinforcing portion at the center region of the planar diaphragm, the rigidity of the planar diaphragm can be further improved, and the sound production performance is improved. The material of the reinforcing portion can be any one of PEN, LCP, PEEK, carbon paper, and magnesium-lithium alloy, which can be flexibly selected according to requirements, and is not limited herein.

[0095] Of course, in other embodiments, the high-frequency diaphragm 321 includes a folded ring portion and a reinforcing portion arranged at the center of the folded ring portion. In this way, after the material and thickness of the reinforcing portion are determined, the width or material of the folded ring portion can be further adjusted to adjust the resonance frequency to meet the use requirements.

[0096] In an embodiment, the high-frequency voice coil 322 is fixed to one side of the high-frequency diaphragm 321 facing the high-frequency magnetic circuit portion 22, the high-frequency voice coil 322 is a flat voice coil formed by winding an enameled wire, and the central axis of the flat voice coil is perpendicular to the high-frequency radiation surface 323; or the high-frequency voice coil 322 includes a coil structure formed by a circuit board and a conductive circuit arranged on the circuit board.

[0097] It can be understood that the high-frequency voice coil 322 can be formed by winding an enameled wire, or the high-frequency voice coil 322 includes a coil structure formed by a circuit board and a conductive circuit arranged on the circuit board. Compared with a conventional ring-shaped voice coil, the axial dimension of the flat voice coil is smaller, and the space occupied by the sound production device 100 along the vibration direction of the high-frequency vibration unit 32 can be further reduced.

[0098] In an embodiment, the first magnet 221, the second magnet 222, and the third magnet 223 are magnetized in a direction perpendicular to the high-frequency radiation surface 323, and the magnetization direction of the second magnet 222 is opposite to the magnetization directions of the first magnet 221 and the third magnet 223.

[0099] In the present embodiment, by magnetizing the first magnet 221, the second magnet 222, and the third magnet 223 of the high-frequency magnetic circuit portion 22, the first magnet 221, the second magnet 222, and the third magnet 223 are all magnetized in a direction perpendicular to the high-frequency radiation surface 323, that is, the first magnet 221, the second magnet 222, and the third magnet 223 are all magnetized in a horizontal direction, and the magnetization direction of the second magnet 222 is opposite to the magnetization directions of the first magnet 221 and the third magnet 223. In this way, the magnetic field strength of the high-frequency magnetic circuit portion 22 is effectively improved, the number of magnetic lines passing through the high-frequency voice coil 322 is increased, the magnetic field force acting on the high-frequency voice coil 322 is increased, the BL value is effectively improved, and the sensitivity of the sound production device 100 is improved.

[0100] It can be understood that the magnetic pole of the first magnet 221 facing the tweeter voice coil 322 is the same as the magnetic pole of the third magnet 223 facing the tweeter voice coil 322, and the magnetic pole of the second magnet 222 facing the tweeter voice coil 322 is opposite to the magnetic pole of the first magnet 221 and the third magnet 223 facing the tweeter voice coil 322.

[0101] In the embodiment, the second magnet 222 is magnetized from left to right, and the first magnet 221 and the third magnet 223 are both magnetized from right to left, that is, when the S pole of the second magnet 222 is on the left and the N pole is on the right, the S pole of the first magnet 221 and the third magnet 223 are on the right and the N pole is on the left, and vice versa.

[0102] In another embodiment, the second magnet 222 is magnetized in a direction perpendicular to the tweeter radiation surface 323, the first magnet 221 and the third magnet 223 are magnetized in a direction parallel to the tweeter radiation surface 323, the magnetization direction of the first magnet 221 is opposite to the magnetization direction of the third magnet 223, and the magnetic pole of the first magnet 221 close to the second magnet 222 is the same as the magnetic pole of the second magnet 222 close to the tweeter radiation surface 323.

[0103] In the embodiment, the magnetization direction of the second magnet 222 is arranged at an angle with the magnetization direction of the first magnet 221 and the third magnet 223. Alternatively, the magnetization direction of the second magnet 222 is arranged perpendicularly to the magnetization direction of the first magnet 221 and the third magnet 223. Specifically, the second magnet 222 is magnetized in a direction perpendicular to the tweeter radiation surface 323, that is, the second magnet 222 is magnetized in a horizontal direction, and the first magnet 221 and the third magnet 223 are magnetized in a direction parallel to the tweeter radiation surface 323, that is, the first magnet 221 and the third magnet 223 are magnetized in a vertical direction.

[0104] Alternatively, the magnetization direction of the first magnet 221 is opposite to the magnetization direction of the third magnet 223, and the magnetic pole of the first magnet 221 close to the second magnet 222 is the same as the magnetic pole of the second magnet 222 close to the tweeter radiation surface 323. It can be understood that in this way, the tweeter magnetic circuit part 22 forms a Halbach magnetic array, the Halbach magnetic array has a magnetic field enhancement side facing the tweeter voice coil 322, effectively improving the magnetic field strength, increasing the number of magnetic field lines passing through the tweeter voice coil 322, increasing the magnetic field force received by the tweeter voice coil 322, effectively improving the BL value, and improving the sensitivity of the sound generating device 100.

[0105] It should be noted that the arrow direction in the magnetic circuit system 2 shown in FIG. 2 is the direction from the S pole to the N pole, that is, the magnetizing direction. In the embodiment, when the second magnet 222 is magnetized from left to right, the first magnet 221 is magnetized from bottom to top, and the third magnet 223 is magnetized from top to bottom, that is, when the S pole of the second magnet 222 is on the left and the N pole is on the right, the N pole of the first magnet 221 is on the top and the S pole is on the bottom, the N pole of the third magnet 223 is on the bottom and the S pole is on the top, and vice versa.

[0106] In an embodiment, the center magnetic part 212 includes a first center magnet 2121, a center magnetic conductive plate 2122, and a second center magnet 2123 stacked together, the common magnetic part 213 includes a first common magnet 2131, a common magnetic conductive plate 2132, and a second common magnet 2133 stacked together, and the edge magnetic part 214 includes an edge magnet 2141 and an edge magnetic conductive plate 2142 stacked together, and the edge magnetic conductive plate 2142 is connected to the shell 1; wherein the first center magnet 2121, the center magnetic conductive plate 2122, and the second center magnet 2123 correspond one-to-one to the first common magnet 2131, the common magnetic conductive plate 2132, and the second common magnet 2133 in a direction parallel to the low-frequency radiation surface 3117.

[0107] In the embodiment, as shown in FIGS. 2 to 5, by arranging the center magnetic part 212 of the low-frequency magnetic circuit part 21 as the first center magnet 2121, the center magnetic conductive plate 2122, and the second center magnet 2123 stacked together, and arranging the common magnetic part 213 as the first common magnet 2131, the common magnetic conductive plate 2132, and the second common magnet 2133 stacked together, the first center magnet 2121, the center magnetic conductive plate 2122, and the second center magnet 2123 of the center magnetic part 212 correspond one-to-one to the first common magnet 2131, the common magnetic conductive plate 2132, and the second common magnet 2133 of the common magnetic part 213 in a direction perpendicular to the vibration direction of the low-frequency diaphragm 311. In this way, the center magnetic part 212 and the edge magnetic part 214 share the common magnetic part 213, and the first low-frequency magnetic gap 215 and the second low-frequency magnetic gap 216 are formed, so that the first low-frequency voice coil 312 and the second low-frequency voice coil 313 can fully utilize the magnetic field of the magnetic circuit system 2, improve the magnetic energy utilization rate of the magnetic circuit system 2, and thus improve the loudness and sensitivity of the sound generating device 100, thereby improving the product performance.

[0108] It can be understood that the low-frequency radiation surface 3117 is arranged vertically to the vibration direction of the low-frequency diaphragm 311, and the vibration direction of the low-frequency diaphragm 311 is consistent with the sound wave radiation direction of the low-frequency diaphragm 311. Alternatively, the edge magnetic conductive plate 2142 of the edge magnetic part 214 can be adhesively connected to the shell 1. In the embodiment, the edge magnetic conductive plate 2142 and the shell 1 can be optionally formed in one piece.

[0109] In an embodiment, the magnetic conducting yoke 211 comprises a first magnetic yoke 2111 and a second magnetic yoke 2112, the first center magnet 2121, the first common magnet 2131 and the side magnet 2141 are connected with the first magnetic yoke 2111, and the second center magnet 2123 and the second common magnet 2133 are connected with the second magnetic yoke 2112; the inner periphery of the low-frequency diaphragm 311 is connected with the second magnetic yoke 2112, so that part of the second magnetic yoke 2112 corresponds to the inner ring hole 3112.

[0110] In the embodiment, as shown in FIGS. 1-3 and 5, the magnetic conducting yoke 211 is arranged as the first magnetic yoke 2111 and the second magnetic yoke 2112 arranged oppositely, so that the installation space is formed between the first magnetic yoke 2111 and the second magnetic yoke 2112, the center magnetic part 212, the common magnetic part 213 and the side magnetic part 214 are arranged on the first magnetic yoke 2111, and the second magnetic yoke 2112 is connected to the ends of the center magnetic part 212 and the common magnetic part 213 away from the first magnetic yoke 2111.

[0111] It can be understood that the center magnetic part 212 and the common magnetic part 213 are arranged between the first magnetic yoke 2111 and the second magnetic yoke 2112, that is, the first center magnet 2121 of the center magnetic part 212 and the first common magnet 2131 of the common magnetic part 213 are connected with the first magnetic yoke 2111, and the second center magnet 2123 of the center magnetic part 212 and the second common magnet 2133 of the common magnetic part 213 are connected with the second magnetic yoke 2112. And the low-frequency diaphragm 311 is arranged as a ring structure, so that the inner ring of the low-frequency diaphragm 311 is connected with the second magnetic yoke 2112, so that part of the second magnetic yoke 2112 corresponds to the inner ring hole 3112, and the side magnetic part 214 is located between the magnetic conducting yoke 211 and the low-frequency diaphragm 311. In this way, the magnetic flux generated by the center magnetic part 212 and the magnetic flux generated by the common magnetic part 213 can form a magnetic circuit passing through the first low-frequency magnetic gap 215, the magnetic flux generated by the common magnetic part 213 and the magnetic flux generated by the side magnetic part 214 form a magnetic circuit passing through the second low-frequency magnetic gap 216, effectively increasing the density of the magnetic flux of the first low-frequency magnetic gap 215 and the second low-frequency magnetic gap 216, so that the first low-frequency voice coil 312 and the second low-frequency voice coil 313 are in a more reasonable magnetic field, to alleviate the distortion of the audio output by the sound generating device 100, and improve the sound quality of the audio output by the sound generating device 100.

[0112] It can be understood that by connecting the inner periphery of the bass diaphragm 311 with the second magnetic yoke 2112, the bass diaphragm 311 is in sealed connection with the second magnetic yoke 2112, thereby improving the sealing performance. At the same time, part of the second magnetic yoke 2112 corresponds to the inner ring hole 3112, so that when the sound generating device 100 is applied to a module or an electronic device, the second magnetic yoke 2112 of the magnetic circuit system 2 of the sound generating device 100 can be used to abut against the inner wall of the shell of the electronic device, so that the bass diaphragm 311 and the shell form a bass front cavity, that is, it is not necessary to additionally increase the front cavity space, and the height difference between the second magnetic yoke 2112 of the magnetic circuit system 2 and the bass diaphragm 311 in the vibration system 3 can form a front cavity structure, thereby effectively reducing the height of the electronic device Z.

[0113] Alternatively, the center magnetic part 212, the shared magnetic part 213 and the edge magnetic part 214 are magnetized along the vertical direction, the shared magnetic part 213 is opposite to the magnetization directions of the center magnetic part 212 and the edge magnetic part 214, and the magnetization directions of the center magnetic part 212 and the edge magnetic part 214 are the same. This arrangement can optimize the nonlinear performance of BL.

[0114] In an embodiment, the first center magnet 2121 and the second center magnet 2123 are both magnetized along the vibration direction of the bass diaphragm 311 in the vibration system 3, and the magnetic poles of the first center magnet 2121 and the second center magnet 2123 close to the center magnetic conducting plate 2122 are the same; the first shared magnet 2131 and the second shared magnet 2133 are both magnetized along the vibration direction of the bass diaphragm 311 in the vibration system 3, and the magnetic poles of the first shared magnet 2131 and the second shared magnet 2133 close to the shared magnetic conducting plate 2132 are the same; the edge magnet 2141 is magnetized along the vibration direction of the bass diaphragm 311 in the vibration system 3; the magnetic poles of the first center magnet 2121 and the second center magnet 2123 close to the center magnetic conducting plate 2122 are opposite to the magnetic poles of the first shared magnet 2131 and the second shared magnet 2133 close to the shared magnetic conducting plate 2132; the magnetic poles of the edge magnet 2141 close to the edge magnetic conducting plate 2142 are the same as the magnetic poles of the first center magnet 2121 close to the center magnetic conducting plate 2122, and the magnetic poles of the edge magnet 2141 close to the edge magnetic conducting plate 2142 are opposite to the magnetic poles of the first shared magnet 2131 close to the shared magnetic conducting plate 2132.

[0115] In the present embodiment, as shown in FIGS. 2 and 3, the vibration direction of the bass diaphragm 311 in the vibration system 3 can be vertical. Alternatively, the first shared magnet 2131 and the second shared magnet 2133 of the shared magnetic part 213 are both magnetized along the vertical direction, and the first center magnet 2121 and the second center magnet 2123 of the center magnetic part 212 are both magnetized along the vertical direction.

[0116] It should be noted that the arrow direction in the magnetic circuit system 2 shown in FIG. 2 is the direction from the S pole to the N pole, that is, the magnetizing direction. The first central magnet 2121 and the second central magnet 2123 of the central magnetic portion 212 are both magnetized in the vertical direction, and the directions are opposite; the first common magnet 2131 and the second common magnet 2133 of the common magnetic portion 213 are both magnetized in the vertical direction, and the directions are opposite. It can be understood that in this way, the central magnetic portion 212, the common magnetic portion 213 and the edge magnetic portion 214 form a magnetic circuit passing through the first low-frequency magnetic gap 215 and the second low-frequency magnetic gap 216 inside the first low-frequency voice coil 312 and the second low-frequency voice coil 313.

[0117] It can be understood that the magnetizing direction of the first central magnet 2121 is opposite to the magnetizing direction of the second central magnet 2123, so that the magnetic induction lines of the first central magnet 2121 and the second central magnet 2123 of the central magnetic portion 212 are gathered in the central magnetic conductive plate 2122, and a magnetic field with a strong magnetic field strength is generated by the central magnetic portion 212 passing through the first low-frequency magnetic gap 215, thereby increasing the density of the magnetic flux of the first low-frequency magnetic gap 215, increasing the number of magnetic force lines passing through the first low-frequency voice coil 312, increasing the magnetic field force received by the first low-frequency voice coil 312, and effectively improving the BL value. At the same time, the magnetizing direction of the first common magnet 2131 is opposite to the magnetizing direction of the second common magnet 2133, so that the magnetic induction lines of the first common magnet 2131 and the second common magnet 2133 of the common magnetic portion 213 are gathered in the common magnetic conductive plate 2132, and a magnetic field with a strong magnetic field strength is generated by the common magnetic portion 213 passing through the first low-frequency magnetic gap 215 and the second low-frequency magnetic gap 216, thereby increasing the density of the magnetic flux of the first low-frequency magnetic gap 215 and the second low-frequency magnetic gap 216, increasing the number of magnetic force lines passing through the first low-frequency voice coil 312 and the second low-frequency voice coil 313, increasing the magnetic field force received by the first low-frequency voice coil 312 and the second low-frequency voice coil 313, and effectively improving the BL value.

[0118] It should be noted that, as shown in FIG. 2, when the first central magnet 2121 is magnetized from bottom to top, the second central magnet 2123 is magnetized from top to bottom, the first common magnet 2131 is magnetized from top to bottom, the second common magnet 2133 is magnetized from bottom to top, and the edge magnet 2141 is magnetized from bottom to top, that is, the N pole of the first central magnet 2121 is on the top, the S pole is on the bottom, the N pole of the second central magnet 2123 is on the bottom, the S pole is on the top, the N pole of the first common magnet 2131 is on the bottom, the S pole is on the top, the N pole of the second common magnet 2133 is on the top, the S pole is on the bottom, and the N pole of the edge magnet 2141 is on the top, the S pole is on the bottom, and vice versa.

[0119] It can be understood that when the first center magnet 2121 is magnetized from bottom to top, the second magnet 222 of the high sound magnetic circuit part 22 is magnetized from left to right, the first magnet 221 and the third magnet 223 are both magnetized from right to left; or, when the second magnet 222 is magnetized from left to right, the first magnet 221 is magnetized from bottom to top, and the third magnet 223 is magnetized from top to bottom, which is not limited here.

[0120] In the embodiment, as shown in FIG. 2, the magnetization direction of the edge magnet 2141 of the edge magnetic part 214 is the same as that of the first center magnet 2121 and opposite to that of the first common magnet 2131. Alternatively, the magnetic pole of the edge magnet 2141 close to the edge magnetic plate 2142 is the same as that of the first center magnet 2121 close to the center magnetic plate 2122, and the magnetic pole of the edge magnet 2141 close to the edge magnetic plate 2142 is opposite to that of the first common magnet 2131 close to the common magnetic plate 2132, which is not limited here.

[0121] It can be understood that the magnetic poles of the first center magnet 2121 and the second center magnet 2123 close to the center magnetic plate 2122 are the same, that is, the magnetic poles of the first center magnet 2121 and the second center magnet 2123 close to the center magnetic plate 2122 are both N poles or S poles. The magnetic poles of the first common magnet 2131 and the second common magnet 2133 close to the common magnetic plate 2132 are the same, that is, the magnetic poles of the first common magnet 2131 and the second common magnet 2133 close to the common magnetic plate 2132 are both S poles or N poles.

[0122] Alternatively, when the magnetic poles of the first center magnet 2121 and the second center magnet 2123 close to the center magnetic plate 2122 are both N poles, the magnetic poles of the first common magnet 2131 and the second common magnet 2133 close to the common magnetic plate 2132 are both S poles, and vice versa. Such arrangement can make the center magnetic part 212 and the edge magnetic part 214 form a magnetic loop passing through the first low sound coil 312 in the first low sound magnetic gap 215 and the second low sound magnetic gap 216, which is not limited here.

[0123] In an embodiment, the first center magnet 2121 includes a plurality of first center magnets 2121, which are arranged adjacent to each other and located between the center magnetic plate 2122 and the first magnetic yoke 2111 of the magnetic yoke 211; wherein the plurality of first center magnets 2121 are all magnetized along the vibration direction of the mid-low sound diaphragm 311 of the vibration system 3, and the magnetization directions of the plurality of first center magnets 2121 are the same.

[0124] Optionally, the plurality of first center magnets 2121 are arranged in parallel between the first magnetic yoke 2111 of the magnetic yoke 211 and the center magnetic plate 2122. The plurality of first center magnets 2121 are magnetized along the vertical direction, and the magnetization directions of the plurality of first center magnets 2121 are the same. That is, the plurality of first center magnets 2121 are magnetized along the moving direction of the first woofer voice coil 312, and the plurality of first center magnets 2121 are magnetized upward or downward at the same time, which is not limited herein.

[0125] In an embodiment, the second center magnet 2123 includes a plurality of second center magnets 2123 arranged adjacently and located on the side of the center magnetic plate 2122 away from the first center magnet 2121; wherein the plurality of second center magnets 2123 are magnetized along the vibration direction of the mid-woofer diaphragm 311 of the vibration system 3, and the magnetization directions of the plurality of second center magnets 2123 are the same.

[0126] Optionally, the plurality of second center magnets 2123 are arranged in parallel on the side of the center magnetic plate 2122 away from the first center magnet 2121. The plurality of second center magnets 2123 are magnetized along the vertical direction, and the magnetization directions of the plurality of second center magnets 2123 are the same. That is, the plurality of second center magnets 2123 are magnetized along the moving direction of the first woofer voice coil 312, and the plurality of second center magnets 2123 are magnetized upward or downward at the same time, which is not limited herein.

[0127] In an embodiment, the first common magnet 2131 includes a plurality of first common magnets 2131 arranged adjacently and located between the common magnetic plate 2132 and the first magnetic yoke 2111 of the magnetic yoke 211; wherein the plurality of first common magnets 2131 are magnetized along the vibration direction of the mid-woofer diaphragm 311 of the vibration system 3, and the magnetization directions of the plurality of first common magnets 2131 are the same.

[0128] Optionally, the plurality of first common magnets 2131 are arranged in parallel between the first magnetic yoke 2111 of the magnetic yoke 211 and the common magnetic plate 2132. The plurality of first common magnets 2131 are magnetized along the vertical direction, and the magnetization directions of the plurality of first common magnets 2131 are the same. That is, the plurality of first common magnets 2131 are magnetized along the moving direction of the first woofer voice coil 312, and the plurality of first common magnets 2131 are magnetized upward or downward at the same time, which is not limited herein.

[0129] In an embodiment, the second common magnet 2133 includes a plurality of second common magnets 2133 arranged adjacently and located on the side of the common magnetic plate 2132 away from the first common magnet 2131; wherein the plurality of second common magnets 2133 are magnetized along the vibration direction of the mid-woofer diaphragm 311 of the vibration system 3, and the magnetization directions of the plurality of second common magnets 2133 are the same.

[0130] Optionally, a plurality of second common magnets 2133 are arranged on the side of the common magnetic conductive plate 2132 opposite to the first common magnet 2131. The plurality of second common magnets 2133 are magnetized along the vertical direction, and the plurality of second common magnets 2133 are magnetized in the same direction. That is, the plurality of second common magnets 2133 are magnetized along the direction in which the first woofer voice coil 312 moves, and the plurality of second common magnets 2133 are magnetized upward or downward at the same time, which is not limited herein.

[0131] In an embodiment, the woofer diaphragm 311 includes an inner ring portion 3111, a first folded ring 3113 arranged around the inner ring portion 3111, a flat portion 3114 arranged around the first folded ring 3113, a second folded ring 3115 arranged around the flat portion 3114, and a fixed portion 3116 connected to the outside of the second folded ring 3115. The fixed portion 3116 is connected to the housing 1, the inner ring portion 3111 forms an inner ring hole 3112, and the inner ring portion 3111 is connected to the periphery of the second magnetic yoke 2112.

[0132] In the present embodiment, as shown in FIGS. 1, 2, 3 and 6, the inner ring portion 3111, the first folded ring 3113, the flat portion 3114, the second folded ring 3115 and the fixed portion 3116 of the woofer diaphragm 311 can be optionally formed as an integral structure, thereby ensuring the vibration performance and structural strength of the woofer diaphragm 311.

[0133] In the present embodiment, the top surface of the side magnetic portion 24 is lower than the top surface of the common magnetic portion 23, the protruding direction of the first folded ring 313 of the diaphragm 31 is away from the magnetic circuit system 2, the protruding direction of the second folded ring 315 is opposite to that of the first folded ring 313, the first folded ring 313 is at least partially opposite to the second magnetic gap 26, and the second folded ring 315 is at least partially opposite to the side magnetic circuit 24. The protruding direction of the first folded ring 313 is away from the magnetic circuit system 2, and the first folded ring 313 is at least partially opposite to the second magnetic gap 26, thereby avoiding interference between the first folded ring 313 and the second magnetic yoke 212 and the common magnetic portion 23. Meanwhile, the top surface of the side magnetic portion 24 is lower than the top surface of the common magnetic portion 23, the protruding direction of the second folded ring 315 is opposite to that of the first folded ring 313, and the second folded ring 315 is at least partially opposite to the side magnetic circuit 24. When the sound generating device 100 is installed in a sound generating module or electronic equipment, the sound area of the front cavity can be increased, the sound wave of the diaphragm 31 can be smoothly transmitted out, and the sound quality effect of the sound generating device 100 can be improved.

[0134] In an embodiment, the bass diaphragm 311 further comprises a reinforcing portion arranged on the flat portion 3114. It can be understood that by arranging the reinforcing portion, the structural strength of the bass diaphragm 311 can be effectively enhanced, thereby improving the connection stability of the first bass voice coil 312 and the second bass voice coil 313, and avoiding tearing of the bass diaphragm 311 when the first bass voice coil 312 and the second bass voice coil 313 drive the bass diaphragm 311 to vibrate.

[0135] In an embodiment, the second common magnet 2133 is provided with a relief structure 2134 adjacent to the periphery of the second bass magnetic gap 216.

[0136] In the present embodiment, as shown in FIGS. 2, 3 and 6, by arranging the relief structure 2134 on the edge of the second common magnet 2133 of the common magnetic portion 213, i.e. arranging a round corner, an inverted bevel, a cut corner or a step structure on the edge of the second common magnet 2133, the bass diaphragm 311 can be relieved, and at the same time, magnetic leakage can be effectively prevented, and the BL value can be improved.

[0137] Optionally, the relief structure 2134 is at least one of an inclined bevel, a round corner, an inverted bevel, and a step structure.

[0138] In an embodiment, the relief structure 2134 can be an inclined bevel. Optionally, the relief structure 2134 forms an angle greater than 90° and less than 180° with the surface of the side of the second common magnet 2133 away from the common magnetic conductive plate 2132. In the present embodiment, the range of the angle formed by the inclined bevel of the relief structure 2134 and the surface of the side of the second common magnet 2133 away from the common magnetic conductive plate 2132 is further optionally 100°-150°, which is not limited herein. Optionally, the angle is 100°, 110°, 120°, 130°, 140°, 150°, etc., which is not limited herein.

[0139] It can be understood that the avoidance structure 2134 is arranged around the periphery of the second common magnet 2133 away from the common magnetic conductive plate 2132, that is, the avoidance structure 2134 is an integral annular slope. Of course, in other embodiments, the avoidance structure 2134 includes a plurality of avoidance structures 2134, which are arranged at intervals and arranged around the periphery of the second common magnet 2133 away from the common magnetic conductive plate 2132, at this time, the adjacent two avoidance structures 2134 are not connected and have a certain spacing. Alternatively, the avoidance structure 2134 includes a plurality of avoidance structures 2134, adjacent avoidance structures 2134 are connected end to end to form a closed ring structure, and are arranged around the periphery of the second common magnet 2133 away from the common magnetic conductive plate 2132. At this time, adjacent avoidance structures 2134 in the plurality of avoidance structures 2134 are adjacent and form a ring structure. Alternatively, the plurality of avoidance structures 2134 can form an angle with the surface of the second common magnet 2133 away from the common magnetic conductive plate 2132, which can be the same or different, or at least partially the same, which is not limited here.

[0140] In an embodiment, the second magnetic yoke 2112 includes a protruding portion 2113 and a rim portion 2114 connected to the protruding portion 2113, the inner ring portion 3111 is connected to the rim portion 2114, so that the protruding portion 2113 passes through the inner ring hole 3112, the protruding portion 2113 forms a recessed groove 2115 facing the central magnetic portion 212, and the second central magnet 2123 has a protruding portion 2124 protruding from the second common magnet 2133, the protruding portion 2124 is accommodated and limited in the recessed groove 2115.

[0141] In the present embodiment, as shown in FIGS. 1-3 and 5, by arranging the second magnetic yoke 2112 as a protruding portion 2113 passing through the inner ring hole 3112, and arranging a rim portion 2114 around the periphery of the protruding portion 2113, the inner ring portion 3111 of the bass diaphragm 311 is connected to the rim portion 2114, so as to realize sealing. It can be understood that when the sound generating device 100 is applied to an electronic device, in order to reduce the height of the electronic device Z, the protruding portion 2113 of the sound generating device 100 can be used to abut against the inner wall of the shell of the electronic device, without the need to additionally increase the front cavity space, and the height difference between the protruding portion 2113 and the bass diaphragm 311 in the vibration system 3 can form a front sound cavity structure, which is not limited here.

[0142] It can be understood that, by arranging the recessed groove 2115 on the protruding part 2113 of the second magnetic yoke 2112, so that part of the second center magnet 2123 is accommodated and limited in the recessed groove 2115, that is, the second center magnet 2123 has a protruding part 2124 protruding from the second common magnet 2133, and the protruding part 2124 is accommodated and limited in the recessed groove 2115. In this way, the second center magnet 2123 of the center magnetic part 212 can be used to support and fixedly install the second magnetic yoke 2112, and the thickness of the second center magnet 2123 can be increased, so that the magnetic field strength of the center magnetic part 212 can be further increased.

[0143] In an embodiment, the common magnetic part 213 is provided with a relief gap 2135 communicating the first bass magnetic gap 215 and the second bass magnetic gap 216; the bass vibration unit 31 further comprises a skeleton 314, the skeleton 314 comprising a main body part 3141 and a connecting part 3142 connected to the main body part 3141, the main body part 3141 being connected to the bass diaphragm 311, and the connecting part 3142 being located in the relief gap 2135, and two ends of the connecting part 3142 being connected to the first bass voice coil 312 and the second bass voice coil 313 respectively.

[0144] In the embodiment, as shown in FIGS. 3-5 and 7, by arranging the skeleton 314, the first bass voice coil 312 and the second bass voice coil 313 are connected to the bass diaphragm 311 through the skeleton 314, so that the first bass voice coil 312 and the second bass voice coil 313 are in a more reasonable magnetic field, that is, in a region with the maximum magnetic flux density, thereby effectively improving the BL value.

[0145] In an embodiment, the skeleton 314 comprises a main body part 3141 and a connecting part 3142, the main body part 3141 being connected to the bass diaphragm 311, and the connecting part 3142 being located in the relief gap 2135 so that two ends of the connecting part 3142 are connected to the first bass voice coil 312 and the second bass voice coil 313 respectively.

[0146] It can be understood that the skeleton 314 is one, and alternatively, the main body part 3141 is arranged in a rectangular ring, the connecting part 3142 comprises a plurality of connecting parts 3142, and the plurality of connecting parts 3142 are arranged at positions corresponding to four corners of the main body part 3141 respectively, and the common magnetic part 213 is provided with a relief gap 2135 corresponding to each connecting part 3142.

[0147] In the embodiment, the main body part 3141 of the skeleton 314 is connected with the flat part 3114 of the bass diaphragm 311, and the plurality of connecting parts 3142 are arranged at intervals. Alternatively, the plurality of connecting parts 3142 are arranged at the four corner positions of the main body part 3141 respectively. The shared magnetic part 213 is provided with a avoiding notch 2135 corresponding to each connecting part 3142, so that each connecting part 3142 is located in a avoiding notch 2135. Alternatively, the four corner positions of the shared magnetic part 213 are provided with a avoiding notch 2135 respectively.

[0148] Of course, the skeleton 314 can also include a plurality of, for example, the skeleton 314 includes two or four. Alternatively, the skeleton 314 includes two, the bass diaphragm 311 has two long axis sides and two short axis sides connected head to tail; two skeletons 314 are arranged along the long axis side or the short axis side at intervals and symmetrically. Each skeleton 314 includes a main body part 3141 and two connecting parts 3142. Alternatively, the skeleton 314 includes four, and the four skeletons 314 are arranged at the four corner positions of the shared magnetic part 213 respectively. Each skeleton 314 includes a main body part 3141 and one connecting part 3142.

[0149] In the embodiment, the side magnetic part 214 and the shared magnetic part 213 are alternatively arranged in the form of a rectangular frame. Alternatively, each corner position of the shared magnetic part 213 is provided with a avoiding notch 2135. Alternatively, the number of the connecting parts 3142 of the skeleton 314 is consistent with the number of the avoiding notches 2135, and they are arranged one by one, which is not limited here.

[0150] In an embodiment, as shown in FIG. 3 and FIG. 7, the two ends of the connecting part 3142 are respectively provided with a first connecting surface 3144 and a second connecting surface 3145, the first connecting surface 3144 is connected with the first bass voice coil 312, and the second connecting surface 3145 is connected with the second bass voice coil 313.

[0151] In the embodiment, the first connecting surface 3144 is connected to the outer side wall of the first bass voice coil 312. The first connecting surface 3144 is arranged at the corner position of the first bass voice coil 312, and the first connecting surface 3144 is alternatively arranged in the form of a concave arc surface. The second connecting surface 3145 is connected to the inner side wall of the second bass voice coil 313. The second connecting surface 3145 is arranged at the corner position of the second bass voice coil 313, and the second connecting surface 3145 is alternatively arranged in the form of a convex arc surface, which is not limited here.

[0152] In an embodiment, the edge magnetic part 214 and the shell 1 form an avoiding space 113; the bass vibration unit 31 further comprises a centering sheet 315, one end of the centering sheet 315 is connected with the shell 1, and the other end of the centering sheet 315 is located in the avoiding space 113; the skeleton 314 further comprises an extension part 3143, one end of the extension part 3143 is connected with the peripheral edge of the main body part 3141, and the other end of the extension part 3143 extends towards the centering sheet 315 and is connected with the centering sheet 315.

[0153] In the embodiment, as shown in FIG. 3 and FIG. 4, by setting the avoiding space 113 between the shell 1 and the edge magnetic part 214, and setting the centering sheet 315, the centering sheet 315 is fixed to the shell 1, and one end of the centering sheet 315 extends to the avoiding space 113, by setting the extension part 3143 on the skeleton 314, the extension part 3143 extends towards the centering sheet 315 and is connected with the centering sheet 315, so that the leads of the first bass voice coil 312 and the second bass voice coil 313 are guided to the centering sheet 315 by the skeleton 314, and are guided to the shell 1 through the centering sheet 315 and connected with the external circuit to conduct. The skeleton 314 not only plays a role of connecting and fixing the first bass voice coil 312 and the second bass voice coil 313, but also avoids the swing or polarization problems of the first bass voice coil 312 and the second bass voice coil 313 in the vibration process.

[0154] It can be understood that by setting the centering sheet 315, the leads of the first bass voice coil 312 and the second bass voice coil 313 can be connected with the external circuit to conduct by using the centering sheet 315, and the swing or polarization problems of the first bass voice coil 312 and the second bass voice coil 313 in the vibration process can be avoided by using the centering sheet 315.

[0155] In an embodiment, the shell 1 has two long edges 111 and two short edges 112 connected head to tail, the centering sheet 315 comprises two, the two centering sheets 315 are symmetrically arranged and correspond to the two short edges 112 respectively, and the high pitch magnetic circuit part 22 and the high pitch vibration unit 32 correspond to the long edges 111.

[0156] In the embodiment, as shown in FIG. 1, FIG. 3 and FIG. 4, the two centering sheets 315 are symmetrically distributed along the direction of the two long edges 111 or the direction of the two short edges 112 of the shell 1. Each centering sheet 315 comprises an outer fixed part, a elastic wall part and an inner fixed part connected in sequence, the outer fixed part is connected with the shell 1 and / or the edge magnetic part 214, the inner fixed part is connected with the extension part 3143, the inner fixed part is provided with an inner solder pad, and the leads of the first bass voice coil 312 and the second bass voice coil 313 extend to the inner solder pad along the extension part 3143.

[0157] Optionally, the two centering fins 315 are symmetrically arranged along the direction of the two short sides 112 of the shell 1, and the treble magnetic circuit portion 22 and the treble vibration unit 32 are arranged corresponding to the long side 111. In this way, the first bass voice coil 312 and the second bass voice coil 313 can be connected to the external circuit through the centering fins 315, and the first bass voice coil 312 and the second bass voice coil 313 can be centered, and the treble vibration unit 32 has a larger vibration space and improves the treble sound effect.

[0158] In the embodiment, as shown in FIGS. 3 and 4, the outer fixed part, the elastic wall part and the inner fixed part of the centering fin 315 can be integrally formed. In this way, the structural strength of the centering fin 315 can be effectively ensured, and the processing steps of the centering fin 315 are simplified. It can be understood that, in order to ensure the deformation ability of the centering fin 315, the elastic wall part has at least one bending.

[0159] Optionally, the outer fixed part, the elastic wall part and the inner fixed part of the centering fin 315 can be located in the same plane. Of course, in other embodiments, the outer fixed part and the inner fixed part of the centering fin 315 can also be located in different planes.

[0160] In an embodiment, the edge magnetic part 214 forms a closed annular structure. The annular edge magnetic part 214 surrounds the common magnetic part 213 and is spaced from the common magnetic part 213 to form an annular second bass magnetic gap 216. Optionally, the edge magnetic part 214 can be a circular ring or a rectangular ring, etc.

[0161] Of course, the edge magnetic part 214 includes a plurality of edge magnetic parts 214, and adjacent edge magnetic parts 214 are connected end to end to form a closed annular structure; or the edge magnetic part 214 includes a plurality of edge magnetic parts 214, and the plurality of edge magnetic parts 214 are arranged in a spaced manner and surround the common magnetic part 213, and adjacent edge magnetic parts 214 have a gap therebetween, which is not limited herein.

[0162] In the embodiment, the common magnetic part 213 surrounds the center magnetic part 212. Optionally, the common magnetic part 213 can be a closed annular structure, and the annular common magnetic part 213 surrounds the center magnetic part 212 and is spaced from the center magnetic part 212 to form an annular first bass magnetic gap 215. Optionally, the common magnetic part 213 can be a circular ring or a rectangular ring, etc. Of course, the common magnetic part 213 includes a plurality of common magnetic parts 213, and the plurality of common magnetic parts 213 surround the center magnetic part 212, and adjacent common magnetic parts 213 are connected end to end to form a closed annular structure; or the common magnetic part 213 includes a plurality of common magnetic parts 213, and the plurality of common magnetic parts 213 are arranged in a spaced manner and surround the center magnetic part 212, and adjacent common magnetic parts 213 have a gap therebetween, which can be a avoiding gap 2135 for providing an avoiding space for the skeleton 314, which is not limited herein.

[0163] In an embodiment, the plurality of common magnetic portions 213 are arranged around the outside of the central magnetic portion 212, and adjacent common magnetic portions 213 are connected end to end to form a closed ring structure.

[0164] It can be understood that each of the plurality of common magnetic portions 213 includes a first common magnet 2131, a common magnetic conductive plate 2132, and a second common magnet 2133 arranged in layers, and at this time, adjacent first common magnets 2131 in adjacent common magnetic portions 213 are connected end to end to form a closed ring structure, adjacent common magnetic conductive plates 2132 are connected end to end to form a closed ring structure, and adjacent second common magnets 2133 are connected end to end to form a closed ring structure, so that the plurality of common magnetic portions 213 are connected end to end to form a closed ring structure, which is not limited herein.

[0165] In an embodiment, as shown in FIGS. 3-5, the plurality of common magnetic portions 213 are arranged around the outside of the central magnetic portion 212, and adjacent common magnetic portions 213 are spaced apart to form a gap.

[0166] It can be understood that each of the plurality of common magnetic portions 213 includes a first common magnet 2131, a common magnetic conductive plate 2132, and a second common magnet 2133 arranged in layers, and at this time, adjacent first common magnets 2131 in adjacent common magnetic portions 213 are spaced apart to form a gap, adjacent common magnetic conductive plates 2132 are spaced apart to form a gap, and adjacent second common magnets 2133 are spaced apart to form a gap, so that the plurality of common magnetic portions 213 are spaced apart and arranged around to form a ring structure with a gap, which is not limited herein. Alternatively, the gap formed by spacing apart adjacent common magnetic portions 213 is a clearance gap 2135.

[0167] In the present embodiment, the first common magnet 2131 and the second common magnet 2133 of the common magnetic portion 213 can be permanent magnets. It can be understood that the first common magnet 2131, the common magnetic conductive plate 2132, and the second common magnet 2133 of the common magnetic portion 213 are arranged in layers along the moving direction of the first woofer voice coil 312, that is, the first common magnet 2131 is connected to the first magnetic yoke 2111 of the magnetic conductive yoke 211, the second common magnet 2133 is connected to the second magnetic yoke 2112 of the magnetic conductive yoke 211, the common magnetic conductive plate 2132 is arranged between the first common magnet 2131 and the second common magnet 2133, and the second common magnet 2133 is arranged on the side of the common magnetic conductive plate 2132 away from the first common magnet 2131.

[0168] In an embodiment, at least part of the common magnetic conductive plate 2132 is projected on the projection of the first woofer voice coil 312 and the second woofer voice coil 313 along the direction perpendicular to the vibration direction of the woofer diaphragm 311.

[0169] It can be understood that the magnetic induction lines of the first common magnet 2131 and the second common magnet 2133 of the common magnetic part 213 are gathered on the common magnetic conductive plate 2132 and pass through the first woofer magnetic gap 215 and the second woofer magnetic gap 216, thereby increasing the density of the magnetic flux of the first woofer magnetic gap 215 and the second woofer magnetic gap 216, so that the first woofer voice coil 312 and the second woofer voice coil 313 are in a more reasonable magnetic field, to alleviate the distortion of the audio output by the sound generating device 100 and improve the sound quality of the audio output by the sound generating device 100. Optionally, the projection of the common magnetic conductive plate 2132 along the horizontal direction is located in the projection of the first woofer voice coil 312 and the second woofer voice coil 313 along the horizontal direction.

[0170] Optionally, the thickness of the common magnetic conductive plate 2132 is less than or equal to the thickness of the first common magnet 2131, and the thickness of the common magnetic conductive plate 2132 is less than or equal to the thickness of the second common magnet 2133, which is not limited herein.

[0171] In an embodiment, at least part of the central magnetic conductive plate 2122 is projected on the projection of the first woofer voice coil 312 along the direction perpendicular to the vibration direction of the woofer diaphragm 311.

[0172] It can be understood that the magnetic induction lines of the first central magnet 2121 and the second central magnet 2123 of the central magnetic part 212 are gathered on the central magnetic conductive plate 2122 and pass through the first woofer magnetic gap 215, thereby increasing the density of the magnetic flux of the first woofer magnetic gap 215, so that the first woofer voice coil 312 is in a more reasonable magnetic field, to alleviate the distortion of the audio output by the sound generating device 100 and improve the sound quality of the audio output by the sound generating device 100. Optionally, the projection of the central magnetic conductive plate 2122 along the horizontal direction is located in the projection of the first woofer voice coil 312 along the horizontal direction.

[0173] Optionally, the thickness of the central magnetic conductive plate 2122 is less than or equal to the thickness of the first central magnet 2121, and the thickness of the central magnetic conductive plate 2122 is less than or equal to the thickness of the second central magnet 2123, which is not limited herein. In the present embodiment, the thickness of the central magnetic conductive plate 2122 is optionally comparable to the thickness of the common magnetic conductive plate 2132.

[0174] In the embodiment, as shown in FIG. 2, the thickness of the first center magnet 2121 along the vibration direction of the low-frequency diaphragm 311 is optionally the same as the thickness of the first common magnet 2131 along the vibration direction of the low-frequency diaphragm 311. Optionally, the thickness of the center magnetic plate 2122 along the vibration direction of the low-frequency diaphragm 311 is the same as the thickness of the side magnetic plate 2142 along the vibration direction of the low-frequency diaphragm 311.

[0175] In an embodiment, the thickness of the second center magnet 2123 along the vibration direction of the low-frequency diaphragm 311 is greater than or equal to the thickness of the second common magnet 2133 along the vibration direction of the low-frequency diaphragm 311. That is, the side surface of the second center magnet 2123 away from the center magnetic plate 2122 protrudes from the side surface of the second common magnet 2133 away from the common magnetic plate 2132 to form a protruding portion 2124. That is, the thickness of the center magnetic portion 212 is greater than the thickness of the common magnetic portion 213, so that the size of the magnetic circuit system 2 can be maximized under the limited reserved space, and the vibration area of the diaphragm 31 is also considered to ensure the sound performance of the sound generating device 100.

[0176] It can be understood that the low-frequency vibration unit 31 of the vibration system 3 is provided with a through structure for the protruding portion to pass through, so that when the sound generating device 100 is applied to the electronic equipment, in order to reduce the height of the electronic equipment Z, the protruding portion 2124 of the magnetic circuit system 2 in the sound generating device 100 can be used to abut against the inner wall of the shell of the electronic equipment, without the need to additionally increase the front cavity space. The height difference between the protruding portion 2124 of the magnetic circuit system 2 and the low-frequency vibration unit 31 of the vibration system 3 can form a front sound cavity structure, which is not limited here.

[0177] Of course, in other embodiments, the thickness of the second center magnet 2123 along the moving direction of the first low-frequency voice coil 312 is optionally the same as the thickness of the second common magnet 2133 along the moving direction of the first low-frequency voice coil 312. The low-frequency diaphragm 311 of the low-frequency vibration unit 31 is arranged opposite to and spaced apart from the center magnetic portion 212, or the low-frequency diaphragm 311 of the low-frequency vibration unit 31 is connected and sealed with the center magnetic portion 212, which is not limited here.

[0178] In an embodiment, the size of the sound generating device 100 along the vibration direction of the low-frequency vibration unit 31 is smaller than the size of the sound generating device 100 along the vibration direction of the high-frequency diaphragm unit 32. It can be understood that in this way, the sound generating device 100 is in a flat structure, which is convenient for the thin design of the application end and improves the user experience.

[0179] In an embodiment, the sound production device 100 is installed in the shell 400 of the sound production module 500, and a low-frequency front cavity 421, a high-frequency front cavity 422 and a rear cavity 430 are formed between the sound production device 100 and the shell 400. The shell 400 is provided with a low-frequency sound hole 411 communicating with the low-frequency front cavity 421 and a high-frequency sound hole 412 communicating with the high-frequency front cavity 422. Sound waves of the low-frequency diaphragm 311 are radiated to the outside through the low-frequency sound hole 411, and sound waves of the high-frequency radiating surface 323 are radiated to the outside through the high-frequency sound hole 412. The volume of the rear cavity 430 is ≤1.5cc.

[0180] In the present embodiment, as shown in FIGS. 8 to 11, the shell 400 of the sound production module 500 has a mounting space, and the sound production device 100 is arranged in the mounting space of the shell 400 and forms a front cavity and a rear cavity 430 with the shell 400. It can be understood that, in order to avoid mutual interference between the sound production of the low-frequency vibration unit 31 and the sound production of the high-frequency vibration unit 32 of the sound production device 100, the front cavity formed by the sound production device 100 and the shell 400 includes a low-frequency front cavity 421 and a high-frequency front cavity 422.

[0181] In an embodiment, as shown in FIGS. 9 to 11, the shell 400 is further provided with a high-frequency sound guide 413 corresponding to the high-frequency vibration unit 32 of the sound production device 100 and enclosing the high-frequency front cavity 422. It can be understood that the low-frequency vibration unit 31 of the sound production device 100 and the shell 400 enclose the low-frequency front cavity 421.

[0182] In order to facilitate the sound produced by the low-frequency diaphragm 311 and the high-frequency diaphragm 321 of the sound production device 100 to be smoothly transmitted to the outside, the shell 400 is provided with a low-frequency sound hole 411 communicating with the low-frequency front cavity 421 and a high-frequency sound hole 412 communicating with the high-frequency front cavity 422. In this way, sound waves of the low-frequency diaphragm 311 are radiated to the outside through the low-frequency sound hole 411, and sound waves of the high-frequency diaphragm 321 are radiated to the outside through the high-frequency sound hole 412.

[0183] It can be understood that the low-frequency sound hole 411 and the high-frequency sound hole 412 can be arranged on different sides of the shell 400 to achieve different sound effects. In the present embodiment, as shown in FIGS. 8 and 9, the low-frequency sound hole 411 and the high-frequency sound hole 412 are optionally located on the same side of the shell 400 and are arranged in a spaced manner. Optionally, the low-frequency sound hole 411 includes a plurality of low-frequency sound holes 411 located on opposite sides or periphery of the high-frequency sound hole 412, which is not limited herein.

[0184] It can be understood that in order to balance the air pressure inside the sound production device 100, the sound production device 100 is also provided with a pressure relief hole, so that when the bass diaphragm 311 vibrates, the sound waves on the side of the bass diaphragm 311 away from the bass front cavity 421 are radiated to the rear cavity 430 through the pressure relief hole, thereby balancing the air pressure on both sides of the bass diaphragm 311. Alternatively, the pressure relief hole is provided on the shell 1 of the sound production device 100; or the pressure relief hole is provided on the magnetic yoke 211 of the magnetic circuit system 2 of the sound production device 100, which is not limited herein. In the present embodiment, the pressure relief hole is optionally provided on the first magnetic yoke 2111 of the magnetic yoke 211 of the magnetic circuit system 2.

[0185] Of course, in order to balance the air pressure on the opposite sides of the treble diaphragm 321 of the sound production device 100, the sound production device 100 is also provided with a pressure relief hole, which communicates the space between the rear cavity 430 and the treble magnetic circuit portion 22 and the treble vibration unit 32, so that when the treble diaphragm 321 vibrates, the sound waves on the side of the treble diaphragm 321 away from the treble front cavity 422 are radiated to the rear cavity 430 through the pressure relief hole, thereby balancing the air pressure on both sides of the treble diaphragm 321.

[0186] In the present embodiment, the sound production device 100 is installed in the shell 400 of the sound production module 500, and the volume of the rear cavity 430 is optionally less than or equal to 1.5 cc. Alternatively, the volume of the rear cavity 430 is 1.5 cc, 1.4 cc, 1.3 cc, 1.2 cc, 1.1 cc, 1 cc, 0.9 cc, 0.8 cc, 0.7 cc, 0.6 cc, 0.5 cc, 0.4 cc, 0.3 cc, 0.2 cc, 0.1 cc, etc., which is not limited herein.

[0187] It can be understood that by setting the magnetic circuit system 2 of the sound production device 100 as the bass magnetic circuit portion 21 and the treble magnetic circuit portion 22, and setting the bass magnetic circuit portion 21 as the magnetic yoke 211 and the center magnetic portion 212, the common magnetic portion 213 and the side magnetic portion 214 provided on the magnetic yoke, so that the center magnetic portion 212 and the side magnetic portion 214 share the common magnetic portion 213, respectively forming the first bass magnetic gap 215 and the second bass magnetic gap 216, and setting the bass vibration unit 31 of the vibration system 3 as an inner-outer double voice coil structure, so that the first bass voice coil 312 is correspondingly arranged with the first bass magnetic gap 215, and the second bass voice coil 313 is correspondingly arranged with the second bass magnetic gap 216, so that the current is passed through the first bass voice coil 312 and the second bass voice coil 313, so that the two voice coils vibrate in the magnetic field of the first bass magnetic gap 215 and the second bass magnetic gap 216 formed by the bass magnetic circuit portion 21 and drive the bass diaphragm 311 to vibrate and produce sound, so as to improve the BL value, at the same time, the first bass voice coil 312 and the second bass voice coil 313 can fully utilize the magnetic field of the center magnetic portion 212 and the common magnetic portion 213, improve the magnetic energy utilization rate of the magnetic circuit system 2, and thus improve the loudness and sensitivity of the sound production device 100, so as to improve the product performance.

[0188] 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 has all the beneficial effects brought by the technical solutions of the foregoing embodiments, which will not be repeated here.

[0189] In an embodiment, the electronic device further comprises a device housing having a mounting space, and the sound production device 100 is arranged in the mounting space of the device housing. Of course, in other embodiments, the electronic device can comprise the sound production module 500, which is not limited here.

[0190] In the embodiment, the electronic device further comprises a flexible circuit board, one end of which is electrically connected to the sound production device 100, and the other end of which is used to connect an external power supply. It can be understood that the flexible circuit board is used to connect and conduct the external circuit with the first bass voice coil 312, the second bass voice coil 313 and the treble voice coil 322 of 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.

[0191] In the embodiment, the device housing has a mounting space, and the sound production device 100 is arranged in the mounting space of the device housing, and at least one end of the flexible circuit board connected with the sound production device 100 is located in the mounting space of the device housing. Of course, in other embodiments, the flexible circuit board can also be arranged in the mounting space of the device housing, which is not limited here.

[0192] It can be understood that the electronic device can be a headset, a mobile phone, an MP3, an MP4, 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 housing of the electronic device in the form of a module, or can be assembled into the housing of the electronic device in the form of a single body.

[0193] The above description 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 according to 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 producing device, characterized by, The sound production device comprises: a housing; a magnetic circuit system connected with the housing, the magnetic circuit system comprising a bass magnetic circuit part having first and second bass magnetic gaps and a treble magnetic circuit part located outside the side magnetic part; and a vibration system comprising a bass vibration unit and a treble vibration unit, the bass vibration unit comprising a bass diaphragm and first and second bass voice coils connected to the bass diaphragm, the first bass voice coil being arranged corresponding to the first bass magnetic gap and the second bass voice coil being arranged corresponding to the second bass magnetic gap, the treble vibration unit being connected to the housing and arranged opposite and spaced apart from the treble magnetic circuit part; wherein the bass vibration unit has a bass radiation surface and the treble vibration unit has a treble radiation surface, the bass radiation surface being arranged at an angle to the treble radiation surface.

2. The sound production device of claim 1, wherein The housing comprises a frame body and a mounting side wall provided at one side of the frame body and enclosing an installation space with the outer wall of the frame body, the mounting side wall being provided with a mounting hole communicating with the installation space; the peripheral edge of the bass diaphragm being connected to one end of the frame body, the bass magnetic circuit part and the treble magnetic circuit part being arranged in the installation space, the treble magnetic circuit part being arranged corresponding to the mounting hole, and the treble vibration unit being connected to the mounting side wall and covering the mounting hole.

3. The sound production device of claim 2, wherein The treble magnetic circuit part comprises first, second and third magnets arranged in the installation space, the first, second and third magnets being arranged in a direction parallel to the treble radiation surface, the first magnet being away from the bass diaphragm, and the third magnet being connected to the frame body; The treble vibration unit comprises a treble diaphragm and a treble voice coil connected to the treble diaphragm, the treble diaphragm being connected to the mounting side wall and covering the mounting hole, and the treble voice coil being arranged opposite and spaced apart from the treble magnetic circuit part in the mounting hole.

4. The sound production device of claim 3, wherein The first, second and third magnets are magnetized in a direction perpendicular to the treble radiation surface, and the magnetization direction of the second magnet is opposite to that of the first and third magnets; or, the second magnet is magnetized in a direction perpendicular to the treble radiation surface, the first and third magnets are magnetized in a direction parallel to the treble radiation surface, and the magnetization direction of the first magnet is opposite to that of the third magnet, the magnetic pole of the first magnet close to the second magnet being the same as that of the second magnet close to the treble radiation surface; and / or, the treble diaphragm is a planar diaphragm, and the material of the planar diaphragm is any one of PEN, LCP, PEEK, carbon paper and magnesium-lithium alloy. And / or, the high pitch voice coil is fixed to one side of the high pitch diaphragm facing the high pitch magnetic circuit part, the high pitch voice coil is a flat voice coil formed by winding enameled wire, and the central axis of the flat voice coil is perpendicular to the high pitch radiation surface; or, the high pitch voice coil comprises a coil structure formed by a circuit board and a conductive circuit arranged on the circuit board; And / or, the high pitch diaphragm is a planar diaphragm, and a reinforcing portion is arranged in the central region of the high pitch diaphragm.

5. The sound production device of claim 1, wherein The low frequency magnetic circuit part comprises a center magnetic part, a common magnetic part and a side magnetic part arranged in the center magnetic part of the magnetic yoke, the common magnetic part is located outside the center magnetic part and is spaced from the center magnetic part to form a first low frequency magnetic gap, and the side magnetic part is located outside the common magnetic part and is spaced from the common magnetic part to form a second low frequency magnetic gap, and the high frequency magnetic circuit part is located outside the side magnetic part.

6. The sound production device of claim 5, wherein, The center magnetic part comprises a first center magnet, a center magnetic plate and a second center magnet arranged in layers, the common magnetic part comprises a first common magnet, a common magnetic plate and a second common magnet arranged in layers, and the side magnetic part comprises a side magnet and a side magnetic plate arranged in layers, and the side magnetic plate is connected with the shell; Wherein, the first center magnet, the center magnetic plate and the second center magnet correspond to the first common magnet, the common magnetic plate and the second common magnet respectively in the direction parallel to the low frequency radiation surface; The low frequency diaphragm is provided with an inner ring hole in the center, the outer periphery of the low frequency diaphragm is connected with the shell, the inner periphery of the low frequency diaphragm is connected with the low frequency magnetic circuit part, and the height of the diaphragm top surface is lower than the height of the top surface of the low frequency magnetic circuit part.

7. The sound production device of claim 6, wherein The first center magnet and the second center magnet are magnetized along the vibration direction of the low frequency diaphragm, and the magnetic poles of the first center magnet and the second center magnet close to the center magnetic plate are the same; The first common magnet and the second common magnet are magnetized along the vibration direction of the low frequency diaphragm, and the magnetic poles of the first common magnet and the second common magnet close to the common magnetic plate are the same, and the side magnet is magnetized along the vibration direction of the low frequency diaphragm; The magnetic poles of the first center magnet and the second center magnet close to the center magnetic plate are opposite to the magnetic poles of the first common magnet and the second common magnet close to the common magnetic plate; The magnetic poles of the side magnet close to the side magnetic plate are the same as the magnetic poles of the first center magnet close to the center magnetic plate, and the magnetic poles of the side magnet close to the side magnetic plate are opposite to the magnetic poles of the first common magnet close to the common magnetic plate.

8. The sound production device of claim 6, wherein, The magnetic yoke comprises a first magnetic yoke and a second magnetic yoke, the first center magnet, the first common magnet and the side magnet are connected with the first magnetic yoke, and the second center magnet and the second common magnet are connected with the second magnetic yoke; The inner periphery of the low frequency diaphragm is connected with the second magnetic yoke, so that part of the second magnetic yoke corresponds to the inner ring hole.

9. The sound production device of claim 8, wherein, The bass diaphragm comprises an inner ring part, a first folded ring arranged around the inner ring part, a flat part arranged around the first folded ring, a second folded ring arranged around the flat part, and a fixed part connected to the outer side of the second folded ring, the fixed part is connected to the shell, the inner ring part forms the inner ring hole, and the inner ring part is connected to the circumference of the second magnetic yoke.

10. The sound production device of claim 9, wherein, The inner ring part, the first folded ring, the flat part, the second folded ring and the fixed part are integrally formed; And / or, the top surface height of the edge magnetic part is lower than the top surface height of the common magnetic part, the protruding direction of the first folded ring is away from the magnetic system, the protruding direction of the second folded ring is opposite to that of the first folded ring, the first folded ring is at least partially opposite to the second magnetic gap, and the second folded ring is at least partially opposite to the edge magnetic part. And / or, the second common magnet is provided with a avoiding structure adjacent to the circumference of the second bass magnetic gap. And / or, the second magnetic yoke comprises a protruding part and an edge part connected to the protruding part, the inner ring part is connected to the edge part, so that the protruding part passes through the inner ring hole, the protruding part faces the center magnetic part to form a recessed groove, the second center magnet has a protruding part protruding from the second common magnet, and the protruding part is accommodated and limited in the recessed groove.

11. The sound production device of any one of claims 6 to 10, wherein, The common magnetic part is provided with an avoiding notch communicating the first bass magnetic gap and the second bass magnetic gap. The bass vibration unit further comprises a skeleton, the skeleton comprises a main body part and a connecting part connected to the main body part, the main body part is connected to the bass diaphragm, and the connecting part is located in the avoiding notch, and two ends of the connecting part are respectively connected to the first bass voice coil and the second bass voice coil.

12. The sound production device of claim 11, wherein, An avoiding space is formed between the edge magnetic part and the shell. The bass vibration unit further comprises a centering support, one end of the centering support is connected to the shell, and the other end of the centering support is located in the avoiding space. The skeleton further comprises an extension part, one end of the extension part is connected to the circumference of the main body part, the other end of the extension part extends towards the centering support and is connected to the centering support.

13. The sound production device of claim 12, wherein, The main body part is arranged in a rectangular ring, the connecting part comprises a plurality of parts, and the plurality of connecting parts are respectively arranged at the positions of four corners of the main body part, and the common magnetic part is provided with one avoiding notch corresponding to each connecting part. And / or, two ends of the connecting part are respectively provided with a first connecting surface and a second connecting surface, the first connecting surface is connected to the first bass voice coil, and the second connecting surface is connected to the second bass voice coil. And / or, the shell has two long edges and two short edges connected head to tail, the centering support comprises two parts, the two centering supports are symmetrically arranged and respectively correspond to two short edges, and the high-frequency magnetic circuit part and the high-frequency vibration unit correspond to the long edges.

14. The sound production device of any one of claims 1 to 10, wherein, The size of the sound generating device along the vibration direction of the bass vibration unit is smaller than the size of the sound generating device along the vibration direction of the high-frequency vibration diaphragm unit.

15. The sound production device of any one of claims 1 to 10, wherein, The sound generating device is installed in a shell of a sound generating module, and forms a low-pitch front cavity, a high-pitch front cavity and a rear cavity which are mutually isolated, the shell is provided with a low-pitch sound outlet hole communicating with the low-pitch front cavity and a high-pitch sound outlet hole communicating with the high-pitch front cavity, sound waves of the low-pitch diaphragm are radiated to the outside through the low-pitch sound outlet hole, and sound waves of the high-pitch radiating surface are radiated to the outside through the high-pitch sound outlet hole. The volume of the rear cavity is ≤1.5 cc.

16. An electronic device, comprising: The electronic device comprises the sound generating device as claimed in any one of claims 1 to 15.

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