Sound production device and electronic equipment

Abstract

The utility model discloses a sounding device and electronic equipment, and relates to the technical field of electroacoustic transduction, a side magnetic part and a central magnetic part of a magnetic circuit system of the sounding device respectively form a first magnetic gap and a second magnetic gap with a magnetic conductive yoke, and a support member and the magnetic conductive yoke enclose to form an airflow cavity. The magnetic conductive yoke is provided with a first through hole communicated with the second magnetic gap and the airflow cavity, the supporting piece is provided with a second through hole communicated with the airflow cavity, the magnetic circuit system is further provided with a through hole communicated with the airflow cavity, a first vibrating diaphragm and a second vibrating diaphragm of the vibrating system are located on the two opposite sides of the magnetic circuit system, and the inner periphery of the first vibrating diaphragm is provided with a third through hole communicated with the second through hole. The first voice coil and the second voice coil are respectively suspended in the first magnetic gap and the second magnetic gap; the sound wave of the first side of the first vibrating diaphragm and the sound wave of the first side of the second vibrating diaphragm radiate outwards on the same side of the sound production device. The sounding device not only improves the high-frequency performance, but also increases the vibration area of the vibration system, thereby improving the performance and effect of the whole machine.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of electroacoustic transduction, in particular to a sound production device and electronic equipment applying the same. BACKGROUND

[0002] In recent years, with the rapid development of consumer electronics, electronic devices such as earphones, smart phones, and VR devices have been widely recognized and applied by consumers. Related supporting products such as earphones have also been improved by those skilled in the art to meet the performance requirements of electronic products and the needs of consumers for product performance.

[0003] Sound production devices are important electroacoustic transduction components in consumer electronics, and are widely used as loudspeakers, receivers, and earphones. With the improvement of electronic product performance, it is inevitable to improve the acoustic performance of sound production devices. In related technologies, to improve the performance of sound production devices, product design is becoming more and more extreme, and space utilization is becoming higher and higher, which leads to risks in product reliability and is not conducive to the improvement of high-frequency performance, resulting in poor overall performance and effect. SUMMARY

[0004] The main purpose of the utility model is to provide a sound production device and electronic equipment, which aims to provide a sound production device that effectively improves high-frequency performance. The sound production device not only reduces the risk of reliability, but also effectively improves high-frequency performance, thereby improving the performance and effect of the overall machine.

[0005] To achieve the above purpose, the utility model 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 center magnetic part, an edge magnetic part, and a magnetic yoke connecting the center magnetic part and the edge magnetic part, a first magnetic gap being formed between the edge magnetic part and the magnetic yoke, a second magnetic gap being formed between the center magnetic part and the magnetic yoke, the first magnetic gap being arranged around the second magnetic gap;

[0008] a support member arranged on the side of the magnetic yoke away from the center magnetic part and enclosing the magnetic yoke to form an air flow cavity, the magnetic yoke being provided with a first through hole communicating with the second magnetic gap and the air flow cavity, the support member being provided with a second through hole communicating with the air flow cavity, the magnetic circuit system further being provided with a through hole passing through the center magnetic part and the magnetic yoke in sequence, the through hole being in communication with the air flow cavity; and

[0009] A vibration system comprises a first diaphragm, a second diaphragm, a first voice coil and a second voice coil, an outer periphery of the first diaphragm is connected with the housing, an inner periphery of the first diaphragm is connected with the support, and the inner periphery of the first diaphragm is provided with a third through hole communicating with the second through hole, an outer periphery of the second diaphragm is connected with the housing and is opposite to and spaced from the magnetic circuit system, and the first diaphragm and the second diaphragm are located on opposite sides of the magnetic circuit system, one end of the first voice coil is connected with the first diaphragm, the other end of the first voice coil is suspended in the first magnetic gap, one end of the second voice coil is connected with the second diaphragm, and the other end of the second voice coil is suspended in the second magnetic gap;

[0010] The sound wave on the first side of the second diaphragm is radiated outward through the first through hole, the through hole, the airflow cavity, the second through hole and the third through hole, and is radiated outward together with the sound wave on the first side of the first diaphragm on the same side of the sound generating device.

[0011] In an embodiment, the magnetic yoke includes a first top plate, a first bottom plate and a first side plate connecting the first top plate and the first bottom plate, the first bottom plate is connected to the housing, the center magnetic part is arranged on the first top plate and is spaced from the first side plate to form the second magnetic gap, and the side magnetic part is arranged on the first bottom plate and is spaced from the first side plate to form the first magnetic gap.

[0012] The first top plate is provided with the first through hole, the support is arranged on a side of the first top plate away from the center magnetic part and forms the airflow cavity together with the first top plate, and the through hole penetrates the center magnetic part and the first top plate in sequence.

[0013] In an embodiment, the first top plate includes a protruding part and a supporting part connected with each other, the protruding part is formed by the first top plate protruding towards the center magnetic part so that the supporting part is arranged around the protruding part.

[0014] The supporting part is provided with the first through hole, the center magnetic part is arranged on the protruding part and is spaced from the supporting part to form the airflow passage, the airflow passage communicates the second magnetic gap and the first through hole, the support is connected to a side of the supporting part away from the airflow passage, and the through hole penetrates the center magnetic part and the protruding part in sequence.

[0015] In an embodiment, a side of the supporting part facing the support is recessed towards the airflow passage to form a supporting groove, and a periphery of the support is limited in the supporting groove.

[0016] And / or, the connection between the protruding part and the supporting part forms an inclined surface, and the first through hole sequentially penetrates the supporting part and the inclined surface;

[0017] And / or, the first through hole includes a plurality of first through holes, and the plurality of first through holes are arranged at intervals and surround the protruding part;

[0018] And / or, the first through hole is an arc-shaped hole extending along the periphery of the protruding part;

[0019] And / or, the first bottom plate is provided with a recess corresponding to the first magnetic gap, and the recess is used to provide a recess for the first voice coil;

[0020] And / or, the first top plate and the first bottom plate are connected to both ends of the first side plate in the vibration direction of the vibration system;

[0021] And / or, the area of the first top plate is defined as S1, and the opening area of the first through hole is defined as S2, S2=(10%-80%)S1;

[0022] And / or, the center magnetic part includes a center magnet and a center magnetic guide plate arranged in layers, the center magnet is connected to the protruding part, and the through hole sequentially penetrates the center magnetic guide plate, the center magnet and the protruding part.

[0023] In an embodiment, the support includes a second top plate, a second side plate arranged at the periphery of the second top plate, and a second bottom plate formed by extending outward from one end of the second side plate away from the second top plate, the second bottom plate is connected to one side of the magnetic yoke away from the center magnetic part, so that the second top plate, the second side plate and the magnetic yoke form the airflow cavity;

[0024] Wherein, the second top plate is provided with the second through hole, and the inner periphery of the first diaphragm is connected to one side of the second top plate away from the airflow cavity, so that the third through hole and the second through hole are in communication.

[0025] In an embodiment, the second through hole is one, and the second through hole and the third through hole are in communication; or, the second through hole includes a plurality of second through holes, and the plurality of second through holes are arranged at intervals;

[0026] And / or, the area of the second top plate is defined as S3, and the opening area of the second through hole is defined as S4, S4=(10%-80%)S3;

[0027] And / or, the support is a metal part, and the second bottom plate and the magnetic yoke are adhesively connected or welded; or, the support is an injection molded part, and the support and the magnetic yoke are integrally injection molded.

[0028] In an embodiment, the first vibrating diaphragm comprises, in sequence, an inner folded ring, a vibrating part and an outer folded ring, the inner side of the inner folded ring is provided with the third through hole and connected with the support, the outer side of the outer folded ring is connected with the shell, and the first voice coil is connected with the vibrating part.

[0029] In an embodiment, the first vibrating diaphragm further comprises a vibrating plate, which is arranged between the vibrating part and the first voice coil.

[0030] In an embodiment, the shell comprises a first shell and a second shell connected with each other, the end of the first shell away from the second shell is connected with the outer side of the first vibrating diaphragm, the side of the second shell away from the first shell is connected with the outer periphery of the second vibrating diaphragm, and the outer periphery of the magnetic yoke is connected with the side of the second shell away from the second vibrating diaphragm.

[0031] In an embodiment, the second vibrating diaphragm comprises a folded ring part and a reinforcing part, the folded ring part is arranged around the reinforcing part, the outer edge of the folded ring part is connected with the shell, and the second voice coil is connected with the reinforcing part.

[0032] In an embodiment, the outer contour of the reinforcing part is circular, the through hole is a circular hole, the diameter of the reinforcing part is defined as D1, the diameter of the through hole is defined as D2, and D2≥0.3D1; or, the projection area of the through hole along the vibration direction of the vibrating system is defined as S5, the projection area of the reinforcing part along the vibration direction of the vibrating system is defined as S6, and S5≥8.5%*S6.

[0033] In an embodiment, the first vibrating diaphragm and the second vibrating diaphragm vibrate in the same direction, the first side of the first vibrating diaphragm and the second vibrating diaphragm radiate first sound waves to the external environment, the second side of the first vibrating diaphragm and the second vibrating diaphragm radiate second sound waves to the external environment, and the first sound waves and the second sound waves are opposite in phase.

[0034] Alternatively, the sound generating device is applied to an electronic device and used to divide the space of the electronic device into an acoustically isolated front cavity and a rear cavity, the first side of the first vibrating diaphragm and the second vibrating diaphragm communicates with the front cavity, the second side of the first vibrating diaphragm and the second vibrating diaphragm communicates with the rear cavity, the first vibrating diaphragm and the second vibrating diaphragm vibrate in the same direction, radiate first sound waves to the front cavity, and radiate second sound waves to the rear cavity, and the first sound waves and the second sound waves are opposite in phase.

[0035] In an embodiment, the first vibrating diaphragm is annular, the inner edge of the first vibrating diaphragm forms the third through hole, and the sound generating device further comprises a first air permeable member connected to the inner edge of the first vibrating diaphragm and covering the third through hole.

[0036] And / or, the first diaphragm, the housing, the magnetic yoke and the support form a first cavity, the sound generating device is provided with a first leakage hole communicating the first cavity with the outside, and the sound generating device further comprises a second air permeable member covering the first leakage hole.

[0037] In an embodiment, the side magnetic part comprises a side magnet and a side magnetic conducting plate which are arranged in a stack, the side magnet is connected with the magnetic yoke, and the side magnetic conducting plate is in an integral molding structure with the housing.

[0038] And / or, the sound generating device further comprises a first positioning ring which is arranged between the outer periphery of the first diaphragm and the housing.

[0039] And / or, the sound generating device further comprises a second positioning ring which is arranged between the outer periphery of the second diaphragm and the housing.

[0040] And / or, the sound generating device further comprises a front cover which is located on the side of the first diaphragm away from the second diaphragm, a second cavity is formed between the first diaphragm and the front cover, the front cover is provided with a fourth through hole communicating the second cavity with the outside, and sound waves of the first diaphragm and the second diaphragm are radiated to the outside through the fourth through hole.

[0041] The utility model also proposes an electronic equipment, the electronic equipment includes:

[0042] A device shell is provided with a receiving cavity; and

[0043] The sound generating device is arranged in the receiving cavity and divides the receiving cavity into a front cavity and a rear cavity which are isolated from each other, and the first side of the first diaphragm and the second diaphragm communicates with the front cavity.

[0044] The device shell is provided with a sound outlet hole communicating with the front cavity, and sound waves of the first side of the first diaphragm and the second diaphragm of the sound generating device are radiated to the outside through the front cavity and the sound outlet hole.

[0045] In an embodiment, the device shell is further provided with a second leakage hole which communicates with the rear cavity.

[0046] The first diaphragm and the second diaphragm radiate sound waves to the rear cavity which are opposite in phase to sound waves of the front cavity, and sound waves of the rear cavity are radiated to the outside through the second leakage hole.

[0047] In an embodiment, the device shell comprises a top wall and a bottom wall which are arranged oppositely and a side wall connecting the top wall and the bottom wall, wherein,

[0048] The sound outlet hole is arranged on the top wall or the connecting region of the side wall and the top wall, and the second leakage hole is arranged on the side wall or the bottom wall or the connecting region of the side wall and the bottom wall.

[0049] The sound-generating device of this utility model houses a magnetic circuit system and a vibration system within a shell. A first magnetic gap and a second magnetic gap are provided on the magnetic circuit system, with the first magnetic gap surrounding the second magnetic gap. The vibration system comprises a first diaphragm, a second diaphragm, a first voice coil, and a second voice coil. The first and second diaphragms are respectively located on opposite sides of the magnetic circuit system and connected to the shell. One end of the first voice coil is connected to the first diaphragm, and the other end is suspended within the first magnetic gap. One end of the second voice coil is connected to the second diaphragm, and the other end is suspended within the second magnetic gap. The sound waves from the first and second diaphragms radiate outwards from the same side of the sound-generating device. Thus, the first... Current is passed through the voice coil and the second voice coil, causing the first and second voice coils to convert electrical energy into mechanical energy within the first and second magnetic gaps formed by the magnetic circuit system, respectively. This drives the first and second voice coils to vibrate the first and second diaphragms, respectively. This not only achieves sound production by driving the two diaphragms driven by two voice coils through a single magnetic circuit system, but also achieves co-directional sound production of the double-sided diaphragms without increasing the overall size, and increases the vibration area of ​​the vibration system, thereby improving performance. Furthermore, by configuring the magnetic circuit system as a central magnetic part, a side magnetic part, and a magnetically conductive yoke connecting the central magnetic part and the side magnetic part, a first magnetic gap is formed between the side magnetic part and the magnetically conductive yoke, and the central magnetic part and the magnetically conductive yoke... A second magnetic gap is formed between the yokes, and a support member is provided on the side of the magnetic yoke facing away from the central magnetic part. The support member connects and fixes the inner periphery of the first diaphragm, and the support member and the magnetic yoke enclose an airflow cavity. The magnetic yoke has a first through hole connecting the second magnetic gap and the airflow cavity, the support member has a second through hole connecting the airflow cavity, and the inner periphery of the first diaphragm has a third through hole connecting the second through hole. This allows the second diaphragm to radiate sound waves outwards through the first through hole, the airflow cavity, the second through hole, and the third through hole in sequence. Simultaneously, a through hole connecting the airflow cavity is provided in the magnetic circuit system, allowing the through hole to sequentially pass through the central magnetic part and the magnetic yoke. This allows the second diaphragm to further radiate sound waves through the through hole, the airflow cavity, and the second... The through holes and the third through hole radiate sound waves outward, so that the sound waves from the first side of the first diaphragm and the second diaphragm radiate outward on the same side of the sound-generating device. This is beneficial for the superposition of compressed air when the first diaphragm and the second diaphragm vibrate, thereby improving the loudness and sensitivity of the sound-generating device. Furthermore, the first diaphragm and the central magnet are installed and fixed by the support and the magnetic yoke respectively, so as to improve the installation stability and reduce the reliability risk. Moreover, the airflow cavity formed by the first through hole of the magnetic yoke and the through hole of the magnetic circuit system, in conjunction with the magnetic yoke and the support, effectively increases the airflow area when the second diaphragm vibrates, thereby ensuring smoother airflow and improving the high-frequency performance of the second diaphragm, thus improving the high-frequency performance of the superimposed first and second diaphragms. Attached Figure Description

[0050] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained according to the structures shown in the drawings without creative labor for those skilled in the art.

[0051] Figure 1 The structural schematic diagram of an embodiment of the sound generating device provided by the present application is shown in the figure.

[0052] Figure 2 The structural schematic diagram of another view of an embodiment of the sound generating device provided by the present application is shown in the figure.

[0053] Figure 3 The cross-sectional schematic diagram of an embodiment of the sound generating device provided by the present application is shown in the figure.

[0054] Figure 4 The exploded schematic diagram of an embodiment of the sound generating device provided by the present application is shown in the figure.

[0055] Figure 5 The structural schematic diagram of an embodiment of the magnetic yoke provided by the present application is shown in the figure.

[0056] Figure 6 The cross-sectional schematic diagram of an embodiment of the magnetic yoke provided by the present application is shown in the figure.

[0057] Figure 7 The structural schematic diagram of an embodiment of the support provided by the present application is shown in the figure.

[0058] Figure 8 The structural schematic diagram of another embodiment of the support provided by the present application is shown in the figure.

[0059] Figure 9 The structural schematic diagram of an embodiment of the electronic device provided by the present application is shown in the figure.

[0060] Explanation of the drawing reference numerals:

[0061] 100, sound production device; 1, shell; 11, first housing; 111, first leakage hole; 12, second housing; 13, first cavity; 2, magnetic circuit system; 21, magnetic yoke; 211, first top plate; 2111, first through hole; 2112, protruding part; 2113, support part; 2114, air flow channel; 2115, support groove; 2116, inclined surface; 2117, third through hole; 212, first bottom plate; 213, first side plate; 22, center magnetic part; 221, center magnet; 2211, second through hole; 222, center magnetic conducting plate; 2221, first through hole; 23, edge magnetic part; 231, edge magnet; 232, edge magnetic conducting plate; 25, first magnetic gap; 26, second magnetic gap; 27, through hole; 3, vibration system; 31, first diaphragm; 311, inner folding ring; 312, vibration part; 313, outer folding ring; 314, third through hole; 315, vibration plate; 32, second diaphragm; 321, folding ring part; 322, reinforcing part; 33, first voice coil; 34, second voice coil; 4, support piece; 41, air flow cavity; 42, second top plate; 421, second through hole; 43, second side plate; 44, second bottom plate; 51, first positioning ring; 52, second positioning ring; 61, first air permeable piece; 62, second air permeable piece; 7, front cover; 71, second cavity; 72, fourth through hole; 800, equipment shell; 810, accommodating cavity; 820, sound outlet hole; 830, second leakage hole; 840, front cavity; 850, rear cavity; 900, electronic equipment.

[0062] The realization, functional features and advantages of the utility model will be further described with reference to the drawings in combination with embodiments. DETAILED DESCRIPTION

[0063] The technical solutions in the embodiments of the utility model will be clearly and completely described below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0064] It should be noted that all the directionality indications (such as up, down, left, right, front, back, etc.) in the embodiments of the utility model are only used to explain the relative position relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings). If the specific posture changes, the directionality indications also change accordingly.

[0065] Meanwhile, the meaning of "and / or" or "and / or" appearing throughout the text is that three schemes are included, taking "A and / or B" as an example, including A scheme, or B scheme, or A and B schemes are satisfied at the same time.

[0066] 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 implying the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included 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 the ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor in the protection scope required by the present application.

[0067] In recent years, with the rapid development of consumer electronics, earphones, smart phones, VR devices and other electronic devices have been recognized by consumers and widely used. The related supporting products such as earphones and the like have also been improved by the skilled in the art to meet the performance requirements of electronic products and meet the needs of consumers for product performance.

[0068] The sound generating device is an important electro-acoustic transducer component in consumer electronics, which is widely used as a loudspeaker, a receiver, an earphone, etc. With the improvement of the performance of electronic products, the improvement of the acoustic performance of the sound generating device is also an inevitable trend. In particular, the requirements of OWS (Open Wearable Stereo, full open wearable earphone) Bluetooth earphone are different from TWS (True Wireless Stereo, true wireless stereo). Because the whole machine is to reflect the convenience and comfort of wearing, the non-ear method is adopted, so the performance improvement of the sound generating device is imminent.

[0069] The traditional Driver design is single-sided vibration sound generation. In the cavity of the whole machine with limited internal space, it is difficult to increase the vibration area and vibration displacement, so the performance improvement of the sound generating device is also limited, which cannot meet the needs of existing OWS and other wearable audio products. At the same time, in order to improve the performance of the sound generating device, the product design is more and more limited, and the space utilization rate is also higher and higher, which leads to the risk of product reliability, and is not conducive to the improvement of high frequency performance, resulting in poor performance and effect of the whole machine.

[0070] 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 electronic equipment, which can be a mobile phone, an earphone, a smart wearable device, etc., which is not limited here.

[0071] In the embodiment, the sound generating device 100 is provided with double diaphragms and double voice coil structures, utilizes one magnetic circuit system 2 to drive two diaphragms to vibrate to realize sound generation, realizes double diaphragm sound generation under the premise of not increasing the size, increases the vibration area of the vibration system 3, so as to achieve the purpose of performance improvement, and the double diaphragms radiate sound waves on the same side of the sound generating device 100, which is beneficial to improve the loudness and sensitivity of the sound generating device 100. And the supporting piece 4 is arranged, and the magnetic yoke 21 is arranged as a positive and negative stretching structure, so as to increase the connection area of the supporting piece 4 and the inner edge of the first diaphragm 31 and the connection area of the center magnetic part 22 of the magnetic circuit system 2 and the magnetic yoke 21, improve the stability, reduce the reliability risk, and through the first through hole 2111 of the magnetic yoke 21 and the through hole 27 of the magnetic circuit system 2 respectively cooperating with the air flow cavity 41 formed by the magnetic yoke 21 and the supporting piece 4, the air flow circulation area of the second diaphragm 32 is effectively increased when vibrating, so as to ensure that the air flow circulation is more smooth, improve the high frequency performance of the second diaphragm 32, and thus improve the high frequency performance of the first diaphragm 31 and the second diaphragm 32 after superposition.

[0072] Please refer to Figures 1 to 8As shown, in the utility model embodiment, the sound production device 100 includes shell 1, magnetic circuit system 2, support piece 4 and vibration system 3, magnetic circuit system 2 is connected with shell 1, magnetic circuit system 2 includes center magnetic part 22, side magnetic part 23 and the magnetic yoke 21 of connecting center magnetic part 22 and side magnetic part 23, first magnetic gap 25 is formed between side magnetic part 23 and magnetic yoke 21, second magnetic gap 26 is formed between center magnetic part 22 and magnetic yoke 21, first magnetic gap 25 is arranged around second magnetic gap 26, support piece 4 is located on the side of magnetic yoke 21 away from center magnetic part 22, and forms airflow cavity 41 with magnetic yoke 21, magnetic yoke 21 is provided with first through hole 2111 that communicates second magnetic gap 26 and airflow cavity 41, support piece 4 is provided with second through hole 421 that communicates airflow cavity 41, magnetic circuit system 2 is further provided with through hole 27 that sequentially penetrates center magnetic part 22 and magnetic yoke 21, through hole 27 is communicated with airflow cavity 41, vibration system 3 includes first diaphragm 31, second diaphragm 32, first voice coil 33 and second voice coil 34, the outer periphery of first diaphragm 31 is connected with shell 1, the inner periphery of first diaphragm 31 is connected with support piece 4, and the inner periphery of first diaphragm 31 is provided with third through hole 314 that communicates second through hole 421, the outer periphery of second diaphragm 32 is connected with shell 1, and is opposite and spaced from magnetic circuit system 2, and first diaphragm 31 and second diaphragm 32 are located on the opposite sides of magnetic circuit system 2, one end of first voice coil 33 is connected with first diaphragm 31, the other end of first voice coil 33 is suspended in first magnetic gap 25, one end of second voice coil 34 is connected with second diaphragm 32, and the other end of second voice coil 34 is suspended in second magnetic gap 26;Wherein, the sound wave of the first side of second diaphragm 32 is radiated outward through first through hole 2111, through hole 27, airflow cavity 41, second through hole 421 and third through hole 314, and the sound wave of the first side of first diaphragm 31 is radiated outward on the same side of sound production device 100.

[0073] In the embodiment, the sound production device 100 can be a sound production unit of a loudspeaker, and the loudspeaker can be a micro loudspeaker.

[0074] It can be understood that the shell 1 is used for mounting, fixing and supporting the magnetic circuit system 2 and the vibration system 3 and the like, that is, the shell 1 provides a mounting basis for the magnetic circuit system 2 and the vibration system 3 and the like.

[0075] The shell 1 in the embodiment can be a frame or a frame structure, that is, the shell 1 has a cavity with two open ends, the magnetic circuit system 2 is accommodated in the cavity of the shell 1 and connected with the shell 1, the first diaphragm 31 and the second diaphragm 32 of the vibration system 3 are respectively arranged on opposite sides of the magnetic circuit system 2, and the outer periphery of the first diaphragm 31 and the outer periphery of the second diaphragm 32 are respectively connected to the two ends of the shell 1, so as to form a double-diaphragm structure, thereby driving the two diaphragms of the two voice coil bands of the vibration system 3 to vibrate to realize sound emission by using one magnetic circuit system 2, realizing the same-direction sound emission of the double-diaphragm on the premise of not increasing the size, and increasing the vibration area of the vibration system 3, so as to achieve the purpose of performance improvement.

[0076] In the embodiment, the shell 1 is provided with a conductive terminal, and the first voice coil 33 and the second voice coil 34 are electrically connected with the conductive terminal. In this way, the sound emitting device 100 can realize the connection of the first voice coil 33 and the second voice coil 34 with the external circuit through the conductive terminal.

[0077] Alternatively, the sound waves of the first side of the first diaphragm 31 and the second diaphragm 322 are radiated outward on the same side of the sound emitting device 100. In this way, the sound waves of the first diaphragm 31 and the second diaphragm 32 in the vibration system 3 can be superimposed to emit sound, thereby improving the sound emission effect and performance. In the embodiment, the first diaphragm 31 and the second diaphragm 32 can be selected to vibrate in the same direction and radiate sound waves of the same phase outward, so as to improve the volume of the sound emitting device 100. In the present application, the sound emitting device 100 has a first side and a second side which are away from each other, the first side refers to the side of the first diaphragm 31 away from the second diaphragm 32, and the second side refers to the side of the second diaphragm 32 away from the first diaphragm 31. The first side and the second side can be understood as the orientation or direction.

[0078] In the embodiment, the shell 1 is used to accommodate and fix the vibration system 3, the magnetic circuit system 2 and other structures, so that the sound emitting device 100 can be applied as an independent component in electronic equipment or a sound emitting module, which is not limited herein. It can be understood that the outline of the sound emitting device 100 can be circular or square, so that the outline of the shell 1, the magnetic circuit system 2 and the vibration system 3 are correspondingly set as circular or square, which is specifically designed according to actual needs, which is not limited herein.

[0079] Alternatively, the shell 1 is in a cylindrical structure, that is, the shell 1 has openings at both ends and is in a circular cylindrical structure with both ends open. The outer periphery of the first diaphragm 31 and the second diaphragm 32 of the vibration system 3 is roughly the same as the outline of the shell 1, and the first diaphragm 31 and the second diaphragm 32 are respectively connected to the openings at both ends of the shell 1, and the magnetic circuit system 2 and the like are arranged in the cavity of the shell 1 and located between the first diaphragm 31 and the second diaphragm 32, so as to facilitate the regular design of the outline of the sound emitting device 100, and further facilitate the assembly in the whole machine and simplify the reserved structure of the whole machine.

[0080] In the embodiment, as shown in Figures 1 to 4 The shell 1 comprises a first shell 11 and a second shell 12 connected together, one end of the first shell 11 away from the second shell 12 is connected with the outer side of the first diaphragm 31, the side of the second shell 12 away from the first shell 11 is connected with the outer periphery of the second diaphragm 32, and the outer periphery of the magnetic yoke 21 is connected with the side of the second shell 12 away from the second diaphragm 32.

[0081] It can be understood that the first shell 11 and the second shell 12 of the shell 1 are optionally in a cylindrical shape, so that the first shell 11 and the second shell 12 are adaptively connected to form a cylindrical shell 1. By designing the shell 1 as a first shell 11 and a second shell 12 arranged separately, the first diaphragm 31 can be assembled by the first shell 11, and the second diaphragm 32 can be assembled by the second shell 12, which facilitates the assembly of the sound generating device 100 during assembly. In the embodiment, the first shell 11 and the second shell 12 of the shell 1 are respectively provided with conductive terminals, thereby facilitating the electrical connection of the first voice coil 33 and the second voice coil 34 with the external circuit, etc.

[0082] In the embodiment, by arranging the magnetic circuit system 2 as the center magnetic part 22, the side magnetic part 23 and the magnetic yoke 21, the center magnetic part 22 and the side magnetic part 23 are fixed by the magnetic yoke 21, so that the first magnetic gap 25 is formed between the side magnetic part 23 and the magnetic yoke 21, the second magnetic gap 26 is formed between the center magnetic part 22 and the magnetic yoke 21, and the side magnetic part 23 is located outside the center magnetic part 22, so that the first magnetic gap 25 is arranged around the second magnetic gap 26. Thus, the first voice coil 33 and the second voice coil 34 of the vibration system 3 correspond to the first magnetic gap 25 and the second magnetic gap 26 respectively, and the conductive terminals are arranged on the shell 1, so that the first voice coil 33 and the second voice coil 34 are electrically connected with the conductive terminals. Thus, the current is passed into the first voice coil 33 and the second voice coil 34, so that the first voice coil 33 and the second voice coil 34 convert the electric energy into mechanical energy in the first magnetic gap 25 and the second magnetic gap 26 formed by the magnetic circuit system 2, to drive the first voice coil 33 and the second voice coil 34 to vibrate the first diaphragm 31 and the second diaphragm 32 respectively. Not only the sound is generated by driving two voice coils to vibrate two diaphragms through one magnetic circuit system 2, but also the sound is generated by the double-sided diaphragm in the same direction without increasing the size, and the vibration area of the vibration system 3 is increased, so as to achieve the purpose of performance improvement.

[0083] In order to realize the sound waves of the first side of the first diaphragm 31 and the second diaphragm 32 to be radiated outward on the same side of the sound generating device 100, and the sound waves to be superimposed and enhanced, and to improve the high frequency performance. In the embodiment, by arranging the support 4 on the side of the magnetic yoke 21 away from the center magnetic part 22, the inner periphery of the first diaphragm 31 is connected and fixed by the support 4, and the airflow cavity 41 is formed by the support 4 and the magnetic yoke 21, and the first through hole 2111 is arranged on the magnetic yoke 21 to communicate the second magnetic gap 26 and the airflow cavity 41, and the second through hole 421 is arranged on the support 4 to communicate the airflow cavity 41, and the third through hole 314 is arranged on the inner periphery of the first diaphragm 31, so that the sound waves of the first side of the second diaphragm 32 are sequentially radiated outward through the first through hole 2111, the airflow cavity 41, the second through hole 421 and the third through hole 314, that is, the second magnetic gap 26, the first through hole 2111, the airflow cavity 41, the second through hole 421 and the third through hole 314 are sequentially communicated to form an airflow passage, and the through hole 27 is arranged on the magnetic circuit system 2 to communicate the airflow cavity 41, so that the through hole 27 sequentially penetrates the center magnetic part 22 and the magnetic yoke 21, so that the sound waves of the first side of the second diaphragm 32 are sequentially radiated outward through the through hole 27, the airflow cavity 41, the second through hole 421 and the third through hole 314, that is, the through hole 27, the airflow cavity 41, the second through hole 421 and the third through hole 314 are sequentially communicated to form another airflow passage, so that the sound waves of the first side of the second diaphragm 32 are radiated outward through the two airflow passages to one side of the first diaphragm 31, so that the sound waves of the first diaphragm 31 and the second diaphragm 32 are radiated outward on the same side of the sound generating device 100, which is beneficial to the superposition of the compressed air when the first diaphragm 31 and the second diaphragm 32 vibrate, and improves the loudness and sensitivity of the sound generating device 100; at the same time, the first diaphragm 31 and the center magnetic part 22 are respectively installed and fixed by the support 4 and the magnetic yoke 21 to improve the installation stability, thereby reducing the reliability risk, and the first through hole 2111 of the magnetic yoke 21, the through hole 27 of the magnetic circuit system 2 and the airflow cavity 41 formed by the magnetic yoke 21 and the support 4 are matched to effectively increase the airflow passage area when the second diaphragm 32 vibrates, thereby ensuring smooth airflow, improving the high frequency performance of the second diaphragm 32, and thereby improving the high frequency performance of the first diaphragm 31 and the second diaphragm 32 after superposition.

[0084] The sound generating device 100 of the utility model discloses a magnetic circuit system 2 and vibration system 3 are housed in the shell 1, and first magnetic gap 25 and second magnetic gap 26 are arranged on the magnetic circuit system 2, so that the first magnetic gap 25 is arranged around the second magnetic gap 26, and the vibration system 3 is arranged as the first diaphragm 31, the second diaphragm 32, the first voice coil 33 and the second voice coil 34, so that the first diaphragm 31 and the second diaphragm 32 are arranged on the opposite sides of the magnetic circuit system 2 respectively and are connected with the shell 1, and one end of the first voice coil 33 is connected with the first diaphragm 31, the other end of the first voice coil 33 is suspended in the first magnetic gap 25, one end of the second voice coil 34 is connected with the second diaphragm 32, the other end of the second voice coil 34 is suspended in the second magnetic gap 26, and the sound waves of the first side of the first diaphragm 31 and the second diaphragm 32 are radiated outward on the same side of the sound generating device 100, so that the current is passed in the first voice coil 33 and the second voice coil 34, so that the first voice coil 33 and the second voice coil 34 convert the electric energy into mechanical energy in the first magnetic gap 25 and the second magnetic gap 26 formed by the magnetic circuit system 2 respectively, to drive the first voice coil 33 and the second voice coil 34 to drive the first diaphragm 31 and the second diaphragm 32 to vibrate respectively, not only the sound is generated by the magnetic circuit system 2 driving two voice coils to drive two diaphragms to vibrate, but also the sound is generated by the diaphragm on the same side under the premise of not increasing the size, and the vibration area of the vibration system 3 is increased, so that the performance is improved.And respectively install and fix the first diaphragm 31 and the center magnetic part 22 by the support 4 and the magnetic yoke 21, to improve the installation stability, so as to reduce the reliability risk, and the airflow cavity 41 formed by the magnetic yoke 21 and the support 4 respectively through the first through hole 2111 of the magnetic yoke 21 and the through hole 27 of the magnetic circuit system 2, effectively increase the airflow circulation area when the second diaphragm 32 vibrates, so as to ensure that the airflow circulation is more smooth, improve the high frequency performance of the second diaphragm 32, so as to improve the high frequency performance of the first diaphragm 31 and the second diaphragm 32 after superposition.

[0085] In the embodiment, the magnetic yoke 21 is a metal magnetic plate. Alternatively, the support 4 is a metal piece. It can be understood that the support 4 and the magnetic yoke 21 can be connected by bonding or welding, which is not limited here. Of course, in other embodiments, the support 4 can be an injection molded part. The support 4 and the magnetic yoke 21 can be integrally injection molded, which is not limited here.

[0086] The sound generating device 100 of the application can have various application environments in actual application. In an embodiment, the first diaphragm 31 and the second diaphragm 32 can be selected to vibrate in the same direction, the first side of the first diaphragm 31 and the second diaphragm 32 radiates the first sound wave to the external environment, the second side of the first diaphragm 31 and the second diaphragm 32 radiates the second sound wave to the external environment, and the first sound wave and the second sound wave are opposite in phase. In this way, the first side and the second side of the sound generating device 100 are both in communication with the external environment, and the first side and the second side radiate sound waves of opposite phases to the external environment. The sound waves on both sides are mutually reduced in the far field, which is suitable for environments that require far-field sound reduction and privacy protection.

[0087] In an embodiment, the sound generating device 100 is applied to an electronic device and is used to divide the space of the electronic device into acoustically isolated front and rear cavities. The first side of the first diaphragm 31 and the second diaphragm 32 is in communication with the front cavity, and the second side of the first diaphragm 31 and the second diaphragm 32 is in communication with the rear cavity. The first diaphragm 31 and the second diaphragm 32 vibrate in the same direction and radiate the first sound wave to the front cavity and the second sound wave to the rear cavity. The first sound wave and the second sound wave are opposite in phase. It can be understood that the electronic device usually has a sound outlet hole for the front cavity sound wave to radiate out. When the electronic device is used, the front cavity sound wave can be radiated out through the sound outlet hole and received by the user. Further, the rear cavity sound wave can be optionally radiated out through the rear leakage hole (second leakage hole in the application). In this way, the front and rear cavity sound waves can realize a sound dipole, achieving the technical effect of reducing sound leakage. Alternatively, the rear cavity sound wave can not be radiated out. The sound generating device of the application only has the effect of superimposing the sound waves on the first side of the first diaphragm 31 and the second diaphragm 32 to enhance the high frequency performance. The selection for use is based on the actual situation.

[0088] In an embodiment, the first diaphragm 31 is annular, and an inner edge of the first diaphragm 31 forms a third through hole 314. The sound production device 100 further comprises a first air permeable member 61, which is connected to the inner edge of the first diaphragm 31 and covers the third through hole 314.

[0089] In the present embodiment, as shown in Figure 3 , Figure 4 the first diaphragm 31 can be an annular diaphragm, and an inner edge of the first diaphragm 31 forms the third through hole 314, i.e., the inner edge of the first diaphragm 31 forms a third through hole 314. It can be understood that, by arranging the first air permeable member 61, the first air permeable member 61 is connected to the inner edge of the first diaphragm 31 and covers the third through hole 314, so that the first air permeable member 61 is used to prevent external dust or impurities from entering the inside of the sound production device 100, thereby avoiding affecting the acoustic performance of the sound production device 100.

[0090] In an embodiment, a first cavity 13 is formed between the first diaphragm 31, the housing 1, the magnetic yoke 21, and the support 4, and the sound production device 100 is provided with a first leakage hole 111 that communicates the first cavity 13 with the outside. The sound production device 100 further comprises a second air permeable member 62 that covers the first leakage hole 111.

[0091] In the present embodiment, as shown in Figure 3 a first cavity 13 is formed between the first diaphragm 31, the housing 1, the magnetic yoke 21, and the support 4 of the vibration system 3, and the first cavity 13 can be a sealed cavity. In order to balance the air pressure in the first cavity 13 and improve the vibration balance of the first diaphragm 31. It can be understood that, by arranging the first leakage hole 111 that communicates the first cavity 13 with the outside on the sound production device 100, the first leakage hole 111 is used to realize air leakage, adjust the air pressure of the first cavity 13, balance the air pressure on both sides of the first diaphragm 31, and improve the vibration stability of the first diaphragm 31.

[0092] Alternatively, the first leakage hole 111 comprises a plurality of first leakage holes 111. In the present embodiment, the plurality of first leakage holes 111 are symmetrically arranged along the circumference of the sound production device 100. Thus, the first leakage holes 111 are used to balance the air pressure of the first cavity 13 and improve the vibration balance of the first diaphragm 31.

[0093] In the present embodiment, by arranging the second air permeable member 62 on the first leakage hole 111, the second air permeable member 62 is used to cover the first leakage hole 111, which can prevent external dust or impurities from entering the inside of the sound production device 100, thereby avoiding affecting the acoustic performance of the sound production device 100. On the other hand, the second air permeable member 62 can further adjust the airflow rate of the first cavity 13, adjust the air pressure of the first cavity 13, balance the air pressure on both sides of the first diaphragm 31, and improve the vibration stability of the first diaphragm 31.

[0094] Optionally, a first leakage hole 111 is arranged between the first shell 11 and the second shell 12 of the housing 1, and a second air permeable member 62 is arranged in the first leakage hole 111. In this way, the air flow speed in the cavity of the sound generating device 100 can be further adjusted, the acoustic resistance is adjusted, and thus the performance of the sound generating device 100 is improved.

[0095] In an embodiment, the magnetic conducting yoke 21 comprises a first top plate 211, a first bottom plate 212, and a first side plate 213 connecting the first top plate 211 and the first bottom plate 212, the first bottom plate 212 is connected to the housing 1, the center magnetic part 22 is arranged on the first top plate 211 and spaced from the first side plate 213 to form the second magnetic gap 26, and the side magnetic part 23 is arranged on the first bottom plate 212 and spaced from the first side plate 213 to form the first magnetic gap 25; wherein the first top plate 211 is provided with a first through hole 2111, the support 4 is arranged on the side of the first top plate 211 away from the center magnetic part 22 and forms the air flow cavity 41 with the first top plate 211, and the through hole 27 penetrates the center magnetic part 22 and the first top plate 211 in sequence.

[0096] In the embodiment, as shown in Figures 3 to 6 , the magnetic conducting yoke 21 can be an integrally formed structure, so that the structural strength of the magnetic conducting yoke 21 is improved, thereby improving the installation stability. The first side plate 213 of the magnetic conducting yoke 21 can be arranged around the periphery of the first top plate 211 and arranged at an angle with the first top plate 211, and the first side plate 213 and the first top plate 211 form a containing cavity, the center magnetic part 22 is arranged in the containing cavity and connected to the first top plate 211 and spaced from the first side plate 213 to form the second magnetic gap 26. The first bottom plate 212 can be connected to one end of the first side plate 213 away from the first top plate 211, and the first bottom plate 212 extends away from the containing cavity and is arranged at an angle with the first side plate 213. The side magnetic part 23 is arranged on the first bottom plate 212 and spaced from the first side plate 213 to form the first magnetic gap 25, that is, the side magnetic part 23 and the center magnetic part 22 are located on opposite sides of the first side plate 213.

[0097] Optionally, the first top plate 211 and the first bottom plate 212 are connected to both ends of the first side plate 213 along the vibration direction of the vibration system 3. It can be understood that the first top plate 211 and the first bottom plate 212 of the magnetic conducting yoke 21 are distributed in an up-down manner along the vibration direction of the vibration system 3, that is, the first top plate 211 and the first bottom plate 212 have a height difference in the vibration direction of the vibration system 3, so that the size of the magnetic circuit system 2 along the vibration direction of the vibration system 3 is not too large, thereby realizing the design of light and thin.

[0098] In the embodiment, as shown in Figure 3As shown, the support member 4 is arranged on one side of the first top plate 211 of the magnetic yoke 21 away from the center magnetic part 22, and forms an air flow cavity 41 together with the first top plate 211, and the first top plate 211 is provided with a first through hole 2111 communicating the air flow cavity 41 and the second magnetic gap 26.

[0099] It can be understood that the number of the first through hole 2111 is one or more. In order to keep the air flow unobstructed and ensure the vibration balance of the second diaphragm 32, the number of the first through hole 2111 is at least two, and in specific applications, different numbers of the first through hole 2111 are set according to needs, and each first through hole 2111 is arranged at intervals. Alternatively, the first through hole 2111 includes a plurality of first through holes 2111 arranged at intervals. In the embodiment, a plurality of first through holes 2111 are arranged around the center magnetic part 22 and are uniformly and interval arranged.

[0100] In an embodiment, the area of the first top plate 211 is defined as S1, and the opening area of the first through hole 2111 is defined as S2, S2=(10%~80%)S1.

[0101] In the embodiment, by controlling the opening area of the first through hole 2111 on the first top plate 211, it can not only be beneficial to the radiation of sound waves of the second diaphragm 32 to the outside, but also can ensure the structural strength of the magnetic yoke 21 and the connection area of the center magnetic part 22 and the first top plate 211, thereby improving the stability. Alternatively, the opening area S2 of the first through hole 2111 accounts for 10%~80% of the area S1 of the first top plate 211. Specifically, it can be 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 85%, etc., which is not limited here.

[0102] It can be understood that the area of the first through hole 2111 is too small, which is not conducive to the radiation of sound waves of the second diaphragm 32 to the outside, and the area of the first through hole 2111 is too large, which makes the bonding area of the center magnetic part 22 and the first top plate 211 too small, which is not conducive to improving the connection reliability of the two.

[0103] It should be noted that when the first through hole 2111 is one, the opening area S2 of the first through hole 2111 is the opening area of one first through hole 2111. When the first through hole 2111 is a plurality, the opening area S2 of the first through hole 2111 is the sum of the opening areas of the plurality of first through holes 2111.

[0104] In the embodiment, as shown in Figure 3 and Figure 4As shown, the through hole 27 passes through the center magnetic part 22 and the first top plate 211 in sequence. The center magnetic part 22 comprises a center magnetic 221 and a center magnetic conducting plate 222 arranged in layers, and the center magnetic 221 is connected to the first top plate 211. Alternatively, the through hole 27 passes through the center magnetic conducting plate 222, the center magnetic 221 and the first top plate 211 in sequence.

[0105] As can be understood, the center magnetic conducting plate 222 of the center magnetic part 22 is provided with a first through hole 2221, the center magnetic 221 is provided with a second through hole 2211, and the first top plate 211 is provided with a third through hole 2117, so that the first through hole 2221, the second through hole 2211 and the third through hole 2117 are connected in sequence to form the through hole 27. Alternatively, the first through hole 2221, the second through hole 2211 and the third through hole 2117 are coaxially arranged along the vibration direction of the vibration system 3.

[0106] In this embodiment, the first through hole 2111 of the first top plate 211 is arranged in a spaced manner with the third through hole 2117. Alternatively, the first through hole 2111 comprises a plurality of first through holes 2111 arranged in a spaced manner and surrounding the third through hole 2117, which is not limited herein.

[0107] In order to further ensure the smoothness of the airflow below the second diaphragm 32, improve the high frequency performance of the second diaphragm 32, and further improve the high frequency performance of the first diaphragm 31 and the second diaphragm 32 after superposition. In an embodiment, the first top plate 211 comprises a protruding part 2112 and a supporting part 2113 connected to each other, the protruding part 2112 is formed by the first top plate 211 protruding towards the center magnetic part 22, so that the supporting part 2113 is arranged around the protruding part 2112; wherein the supporting part 2113 is provided with the first through hole 2111, the center magnetic part 22 is arranged on the protruding part 2112 and spaced from the supporting part 2113 to form an airflow passage 2114, the airflow passage 2114 communicates the second magnetic gap 26 and the first through hole 2111, the support 4 is connected to one side of the supporting part 2113 away from the airflow passage 2114, and the through hole 27 passes through the center magnetic part 22 and the protruding part 2112 in sequence.

[0108] In this embodiment, as shown, Figures 3 to 6 by arranging the protruding part 2112 protruding towards the center magnetic part 22 on the first top plate 211 of the magnetic conducting yoke 21, so that the center magnetic part 22 is arranged on the protruding part 2112 and spaced from the supporting part 2113 to form an airflow passage 2114, and the first through hole 2111 is arranged on the supporting part 2113, so that the airflow passage 2114 communicates the second magnetic gap 26 and the first through hole 2111, which can not only ensure the smoothness of the airflow below the second diaphragm 32, improve the high frequency performance of the second diaphragm 32, but also ensure the magnet volume of the center magnetic part 22, thereby ensuring the magnetic field strength.

[0109] It can be understood that the protruding portion 2112 is located in the center of the first top plate 211, thereby facilitating the installation and fixation of the center magnetic portion 22, and the supporting portion 2113 is arranged around the protruding portion 2112, so that a plurality of first through holes 2111 can be arranged to ensure the smooth flow of air below the second diaphragm 32. In this embodiment, the through hole 27 penetrates the center magnetic portion 22 and the protruding portion 2112 in sequence, that is, the protruding portion 2112 is provided with a third through hole 2117.

[0110] In this embodiment, as shown in Figures 3 to 6 , the connection between the protruding portion 2112 and the supporting portion 2113 forms an inclined surface 2116, and the first through hole 2111 penetrates the supporting portion 2113 and the inclined surface 2116 in sequence. It can be understood that the protruding portion 2112 is recessed from the side of the first top plate 211 of the magnetic yoke 21 facing the support 4 in a direction away from the support 4, so that the side of the first top plate 211 facing the center magnetic portion 22 is protruding to form the protruding portion 2112, that is, by stamping or stretch forming, which is not limited here.

[0111] It can be understood that by arranging the first through hole 2111 to penetrate the supporting portion 2113 and the inclined surface 2116 in sequence, the opening area of the first through hole 2111 is further increased, the smooth flow of air below the second diaphragm 32 is ensured, the high-frequency performance of the second diaphragm 32 is improved, and the magnet volume of the center magnetic portion 22 is ensured, thereby ensuring the magnetic field strength. Alternatively, the first through hole 2111 includes a plurality of first through holes 2111, which are arranged at intervals and around the protruding portion 2112.

[0112] In this embodiment, the first top plate 211 and the center magnetic portion 22 can be circular in shape. In order to further increase the opening area of the first through hole 2111, the first through hole 2111 can be an arc-shaped hole extending along the circumference of the protruding portion 2112.

[0113] In an embodiment, as shown in Figure 3 , Figure 5 , Figure 6 , the side of the supporting portion 2113 facing the support 4 is recessed to form a supporting groove 2115 towards the air flow channel 2114, and the circumference of the support 4 is limited in the supporting groove 2115. It can be understood that by recessing the circumference of the first top plate 211, the side of the supporting portion 2113 facing the support 4 is recessed to form the supporting groove 2115 towards the air flow channel 2114, so that the supporting groove 2115 can be used to position and install the support 4, thereby improving the installation precision.

[0114] Alternatively, the first bottom plate 212 is provided with a recess for the first magnetic gap 25, and the recess is used to provide a recess for the first voice coil 33. It can be understood that the recess provides a space for the first voice coil 33, thereby providing the performance of the sound generating device 100.

[0115] In an embodiment, as shown in Figure 3 , Figure 4 The central magnetic part 22 comprises a central magnet 221 and a central magnetic conducting plate 222 which are stacked, and the central magnet 221 is connected to the magnetic conducting yoke 21. It can be understood that the central magnet 221 is connected to the first top plate 211 of the magnetic conducting yoke 21, that is, the central magnet 221 is clamped between the first top plate 211 and the central magnetic conducting plate 222, and the outer periphery of the central magnet 221 and the central magnetic conducting plate 222 is spaced from the first side plate 213 of the magnetic conducting yoke 21 to form a second magnetic gap 26.

[0116] Optionally, the central magnet 221 and the central magnetic conducting plate 222 of the central magnetic part 22 can be circular plate or disc structure, which is not limited here.

[0117] In the embodiment, the central magnetic part 22 comprises a central magnet 221 and a central magnetic conducting plate 222 which are stacked, and the central magnet 221 is connected to the protruding part 2112, and the through hole 27 penetrates the central magnetic conducting plate 222, the central magnet 221 and the protruding part 2112 in sequence.

[0118] In an embodiment, as shown in Figure 3 , Figure 4 The edge magnetic part 23 comprises an edge magnet 231 and an edge magnetic conducting plate 232 which are stacked, and the edge magnet 231 is connected to the magnetic conducting yoke 21. It can be understood that the edge magnet 231 is connected to the first bottom plate 212 of the magnetic conducting yoke 21, that is, the edge magnet 231 is clamped between the first bottom plate 212 and the edge magnetic conducting plate 232, and the inner periphery of the edge magnet 231 and the edge magnetic conducting plate 232 is spaced from the first side plate 213 of the magnetic conducting yoke 21 to form a first magnetic gap 25. Optionally, the edge magnet 231 and the edge magnetic conducting plate 232 of the edge magnetic part 23 can be a circular ring structure, which is not limited here.

[0119] In order to further improve the connection stability, in the embodiment, the edge magnetic conducting plate 232 is an integral molding structure with the shell 1. It can be understood that the shell 1 can be a metal material or a plastic material. When the shell 1 is a metal material, the shell 1 is integrally machined and formed with the edge magnetic conducting plate 232, so that the machining steps can be simplified and the heat dissipation effect can be improved. When the shell 1 is a plastic material, the shell 1 and the edge magnetic conducting plate 232 can be integrally injection molded, which is not limited here.

[0120] Optionally, the edge magnetic conductive plate 232 is integrally formed with the first shell 11 of the shell 1, which is not limited herein. In the embodiment, the edge magnetic conductive plate 232 is injection molded on the shell 1, and the first leakage hole 111 is formed by material removal on the edge magnetic conductive plate 232 and / or the corresponding region of the shell 1. It can be understood that by forming the first leakage hole 111 on the edge magnetic conductive plate 232 or the shell 1 or simultaneously on the edge magnetic conductive plate 232 and the shell 1, the first leakage hole 111 does not additionally occupy the radial dimension of the sound production device 100, or the size of the first leakage hole 111 can be increased under the limited size of the sound production device 100 to balance the internal pressure.

[0121] In an embodiment, the support 4 comprises a second top plate 42, a second side plate 43 arranged at the periphery of the second top plate 42, and a second bottom plate 44 formed by extending outward from one end of the second side plate 43 away from the second top plate 42, the second bottom plate 44 is connected to the side of the magnetic yoke 21 away from the center magnetic part 22, so that the second top plate 42, the second side plate 43 and the magnetic yoke 21 form the airflow cavity 41; wherein the second top plate 42 is provided with a second through hole 421, and the inner periphery of the first diaphragm 31 is connected to the side of the second top plate 42 away from the airflow cavity 41, so that the third through hole 314 and the second through hole 421 are in communication.

[0122] In the embodiment, as shown in Figure 3 , Figure 4 , Figure 7 and Figure 8 , the support 4 can be an integrally formed structure. The second side plate 43 is arranged at the periphery of the second top plate 42 and is arranged at an angle with the second top plate 42, that is, the second side plate 43 and the second top plate 42 form a recess, and the second bottom plate 44 is connected to one end of the second side plate 43 away from the second top plate 42 and extends away from the recess, that is, the second bottom plate 44 and the second side plate 43 are arranged at an angle, so that the support 4 is connected to the magnetic yoke 21 by the second bottom plate 44, thereby increasing the contact area and improving the connection stability, and the second side plate 43 of the support 4 supports the second top plate 42 away from the first top plate 211 of the magnetic yoke 21, so that the second top plate 42, the second side plate 43 and the first top plate 211 of the magnetic yoke 21 form the airflow cavity 41, and the inner periphery of the first diaphragm 31 is fixed by the second top plate 42 of the support 4.

[0123] Optionally, the support 4 is a metal piece, and the second bottom plate 44 is adhesively connected or welded to the magnetic yoke 21.

[0124] It can be understood that the second top plate 42 of the support 4 is provided with a second through hole 421, so that the air flow cavity 41 communicates with the outside through the second through hole 421 and the third through hole 314 of the first diaphragm 31. In the embodiment, the third through hole 314 of the first diaphragm 31 can be one or more. When the third through hole 314 is one, that is, the first diaphragm 31 is a ring-shaped diaphragm, the inner periphery of the first diaphragm 31 forms the third through hole 314, that is, the second through hole 421 of the second top plate 42 is located in the projection range of the third through hole 314 on the second top plate 42. When the third through hole 314 is more than one, the inner side of the first diaphragm 31 is flat and is connected with the second top plate 42, and the inner side of the first diaphragm 31 is provided with a plurality of third through holes 314, and the plurality of third through holes 314 at least partially correspond to and communicate with the second through hole 421, which is not limited herein.

[0125] Optionally, the second through hole 421 is one, and the second through hole 421 corresponds to and communicates with the third through hole 314; or the second through hole 421 includes a plurality of second through holes 421, and the plurality of second through holes 421 are arranged at intervals.

[0126] It should be noted that when the second top plate 42 is provided with a plurality of second through holes 421 and the inner side of the first diaphragm 31 is provided with a plurality of third through holes 314, the plurality of second through holes 421 and the plurality of third through holes 314 are optionally arranged one by one, which is not limited herein.

[0127] In an embodiment, the area of the second top plate 42 is defined as S3, and the opening area of the second through hole 421 is defined as S4, S4=(10%~80%)S3.

[0128] In the embodiment, by controlling the opening area of the second through hole 421 on the second top plate 42, the sound waves of the second diaphragm 32 can be beneficially radiated to the outside, and the structural strength of the support 4 and the connection area of the inner edge of the first diaphragm 31 and the second top plate 42 can be ensured, thereby improving the stability. Optionally, the opening area S4 of the second through hole 421 accounts for 10%~80% of the area S3 of the second top plate 42. Specifically, it can be 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 85%, etc., which is not limited herein.

[0129] It can be understood that the area of the second through hole 421 is too small, which is not conducive to the radiation of the sound waves of the second diaphragm 32 to the outside; and the area of the second through hole 421 is too large, which makes the bonding area of the first diaphragm 31 and the second top plate 42 too small, which is not conducive to improving the connection reliability of the two.

[0130] It should be noted that when the second through hole 421 is one, the opening area S4 of the second through hole 421 is the opening area of one second through hole 421. When the second through hole 421 is multiple, the opening area S4 of the second through hole 421 is the sum of the opening areas of multiple second through holes 421.

[0131] In an embodiment, as shown in Figure 3 、 Figure 4 The first diaphragm 31 includes an inner folding ring 311, a vibrating part 312 and an outer folding ring 313 connected in sequence. The inner side of the inner folding ring 311 is provided with a third through hole 314 and connected with the support 4. The outer side of the outer folding ring 313 is connected with the shell 1. The first voice coil 33 is connected with the vibrating part 312. It can be understood that by setting the first diaphragm 31 as a double folding ring structure, the flexibility of the first diaphragm 31 is improved when the first voice coil 33 vibrates, and the high frequency performance is improved.

[0132] It can be understood that the inner side of the inner folding ring 311 of the first diaphragm 31 can be a ring structure or a flat plate structure. When the inner side of the inner folding ring 311 is a ring structure, the inner side of the inner folding ring 311 forms the third through hole 314. When the inner side of the inner folding ring 311 is a flat plate structure, the flat plate structure is provided with the third through hole 314, which is not limited here.

[0133] In the embodiment, the inner folding ring 311 and the outer folding ring 313 of the first diaphragm 31 are convex structures protruding upward or concave structures recessing downward, which are not limited here. It can be understood that the inner folding ring 311 of the first diaphragm 31 protrudes away from the direction of the support 4, so that the first diaphragm 31 can avoid interference when vibrating. Alternatively, the inner folding ring 311 and the outer folding ring 313 of the first diaphragm 31 both protrude away from the direction of the magnetic circuit system 2.

[0134] Alternatively, the inner folding ring 311, the vibrating part 312 and the outer folding ring 313 of the first diaphragm 31 are integrally formed, so that the processing steps of the first diaphragm 31 can be simplified, and the structural strength of the first diaphragm 31 can be improved.

[0135] In an embodiment, as shown in Figure 3 、 Figure 4 The first diaphragm 31 further includes a vibrating plate 315 arranged between the vibrating part 312 and the first voice coil 33. It can be understood that by arranging the vibrating plate 315, the structural strength of the first diaphragm 31 is enhanced, the acoustic performance of the first diaphragm 31 is improved, and the first voice coil 33 is prevented from tearing the first diaphragm 31 when vibrating.

[0136] In an embodiment, the second diaphragm 32 comprises a reinforcing portion 322 and a folded ring portion 321, the folded ring portion 321 is arranged around the reinforcing portion 322, the outer edge of the folded ring portion 321 is connected with the shell 1, and the second voice coil 34 is connected with the reinforcing portion 322.

[0137] In the embodiment, as shown in Figures 2 to 4 , the folded ring portion 321 and the reinforcing portion 322 of the second diaphragm 32 can be an integral structure or a split structure, which is not limited herein. It can be understood that the folded ring portion 321 of the second diaphragm 32 is a convex structure protruding upward or a concave structure recessing downward, which is not limited herein. Alternatively, the folded ring portion 321 protrudes in a direction away from the magnetic circuit system 2.

[0138] It can be understood that the outer edge of the folded ring portion 321 is connected with the shell 1, and the second voice coil 34 is connected with the reinforcing portion 322, so that when the second voice coil 34 vibrates, the second diaphragm 32 is driven to vibrate, thereby making the sound wave of the second diaphragm 32 radiate outward along the second magnetic gap 26, the airflow passage 2114, the first through hole 2111, the airflow cavity 41, the second through hole 421, and the third through hole 314.

[0139] In an embodiment, the reinforcing portion 322 has a circular outer contour, and the through hole 27 is a circular hole, the diameter of the reinforcing portion 322 is defined as D1, and the diameter of the through hole 27 is defined as D2, D2≥0.3D1. It can be understood that the diameter of the reinforcing portion 322 and the diameter of the through hole 27 directly affect the transmission of the sound wave of the second diaphragm 32. Through the above diameter design method, the sound wave of the second diaphragm 32 can be smoothly transmitted, and air flow sound can be reduced.

[0140] In order to realize the smooth transmission of the sound wave of the second diaphragm 32, in another embodiment, the projection area of the through hole 27 along the vibration direction of the vibration system is defined as S5, and the projection area of the reinforcing portion 322 along the vibration direction of the vibration system is defined as S6, S5≥8.5%*S6. It can be understood that through the above projection area design method, the sound wave of the second diaphragm 32 can be smoothly transmitted, and air flow sound can be reduced. In actual application, according to specific needs, appropriate structure design is selected to meet the smooth transmission of the sound wave of the second diaphragm 32 and reduce air flow sound, which is not limited herein.

[0141] In an embodiment, as shown in Figure 3 , Figure 4 , the sound generating device 100 further comprises a first positioning ring 51 arranged between the outer periphery of the first diaphragm 31 and the shell 1. Alternatively, the first positioning ring 51 can be a steel ring, and the outer periphery of the outer folded ring 313 of the first diaphragm 31 and the shell 1 are connected by the first positioning ring 51, so that the first diaphragm 31 is convenient to take during assembly, and the assembly precision and the performance of the sound generating device 100 are improved.

[0142] In an embodiment, as shown in Figure 3 、 Figure 4 , the sound production device 100 further comprises a second positioning ring 52 arranged between the outer periphery of the second diaphragm 32 and the shell 1. Optionally, the second positioning ring 52 can be a steel ring, and the outer periphery of the folded ring portion 321 of the second diaphragm 32 is arranged between the outer periphery of the folded ring portion 321 of the second diaphragm 32 and the shell 1 by using the second positioning ring 52, so that the second diaphragm 32 is convenient to take during assembly, and at the same time, the assembly precision is improved, and the performance of the sound production device 100 is improved.

[0143] In an embodiment, the sound production device 100 further comprises a front cover 7 located on the side of the first diaphragm 31 away from the second diaphragm 32, and a second cavity 71 is formed between the first diaphragm 31 and the front cover 7. The front cover 7 is provided with a fourth through hole 72 communicating the second cavity 71 and the outside, and the sound waves on the first side of the first diaphragm 31 and the second diaphragm 32 are radiated to the outside through the fourth through hole 72.

[0144] In the embodiment, as shown in Figure 1 、 Figure 3 、 Figure 4 , by arranging the front cover 7, on the one hand, the front cover 7 protects the first diaphragm 31, and on the other hand, the second cavity 71 is formed between the front cover 7 and the first diaphragm 31 to ensure the amplitude of the first diaphragm 31. It can be understood that by arranging the fourth through hole 72 on the front cover 7, the sound waves on the first side of the first diaphragm 31 and the second diaphragm 32 are conveniently radiated to the outside through the fourth through hole 72.

[0145] Optionally, the front cover 7 is a metal piece processed from a metal material, which is convenient to support the sound production device 100 during assembly of the sound production device 100 and also reduces the occupation of the overall size. In specific applications, a proper number of fourth through holes 72 is arranged according to actual conditions, and is not limited to a fixed number. Preferably, a damping piece or a breathable film is arranged on the fourth through hole 72, which can further adjust the airflow velocity of the second cavity 71 and adjust the acoustic resistance of the second cavity 71.

[0146] In an embodiment, the magnetic circuit system 2 further comprises a first magnet arranged in the airflow cavity 41, the through hole 27 sequentially penetrates the center magnetic portion 22, the magnetic yoke 21 and the first magnet, and the support piece 4 is provided with a second through hole 421 communicating with the through hole 27, and the first magnet is used to assist in increasing the number of magnetic induction lines passing through the magnetic yoke 21.

[0147] In the embodiment, the first magnet is arranged in the air flow cavity 41 to cooperate with the central magnetic part 22, effectively strengthen the magnetic field intensity of the magnetic circuit system 2, thereby improving the BL value, and meanwhile the first top plate 211 of the magnetic yoke 21 and / or the second top plate 42 of the support 4 can be used to improve the mounting stability of the first magnet.

[0148] It can be understood that, by using the through hole 27 to sequentially pass through the central magnetic part 22, the magnetic yoke 21 and the first magnet, the through hole 27 is communicated with the second through hole 421, thereby further forming another air flow channel for the second diaphragm 32 to radiate sound waves, to further ensure the smoothness of the air flow below the second diaphragm 32 and improve the high-frequency performance of the second diaphragm 32.

[0149] Optionally, the projection area of the first magnet along the vibration direction of the vibration system 3 is smaller than the area of the convex part 2112 of the first top plate 211 of the magnetic yoke 21, so that the mounting stability can be improved without affecting the radiation of sound waves of the second diaphragm 32 by the first through hole 2111 of the magnetic yoke 21.

[0150] In the embodiment, the opposite sides of the first magnet are connected with the magnetic yoke 21 and the support 4 respectively, so that the connection stability of the first magnet and the support 4 can be further improved, thereby improving the reliability.

[0151] Optionally, the first through hole 2111 includes a plurality of first through holes 2111, and the plurality of first through holes 2111 are arranged in a spaced and surrounding manner around the first magnet. Optionally, the second through hole 421 includes a plurality of second through holes 421, at least part of the second through holes 421 are communicated with the through hole 27, and the other part of the second through holes 421 are arranged in a spaced and surrounding manner around the first magnet, which is not limited herein.

[0152] The sound generating device 100 of the utility model by the magnetic yoke 21 of the magnetic circuit system 2 is arranged as a reverse bending structure, which can increase the bonding area of the central magnetic part 22, reduce the reliability risk, increase the area of the first through hole 211 of the magnetic yoke 21, and arrange the through hole 27 passing through the central magnetic part 22 and the magnetic yoke 21 to cooperate with the first through hole 211 of the magnetic yoke 21 to form two air flow channels for the second diaphragm 32 to radiate sound outward, thereby ensuring the smoothness of the air flow below the second diaphragm 32 and improving the high-frequency performance.

[0153] As shown in Figure 9 The utility model also provides an electronic equipment 900, which comprises the sound generating device 100. The specific structure of the sound generating device 100 is referred to the foregoing embodiments. Since the electronic equipment 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.

[0154] In an embodiment, the electronic device 900 further comprises a device housing 800, the device housing 800 is provided with a receiving cavity 810, the sound generating device 100 is arranged in the receiving cavity 810 and divides the receiving cavity 810 into a front cavity 840 and a rear cavity 850 which are isolated from each other, the first side of the first diaphragm 31 and the second diaphragm 32 communicates with the front cavity 840; wherein the device housing 800 is provided with a sound outlet hole 820 which communicates with the front cavity 840, and the sound waves of the first side of the first diaphragm 31 and the second diaphragm 32 of the sound generating device 100 are radiated to the outside through the front cavity 840 and the sound outlet hole 820.

[0155] In the embodiment, the device housing 800 can be a metal housing or a plastic housing, which is not limited herein. The device housing 800 can be an integrally formed structure or a split structure, which is not limited herein. Optionally, the device housing 800 comprises an upper shell and a lower shell, and the upper shell and the lower shell can be adhesively connected or welded to enclose the receiving cavity 810.

[0156] Optionally, the outer contour of the device housing 800 can be a square structure, and in specific applications, other suitable shapes such as a circle can be selected according to actual conditions, and the shape is not limited to a specific shape.

[0157] It can be understood that the sound outlet hole 820 which communicates with the front cavity 840 is arranged on the upper shell of the device housing 800, so that the sound waves of the first side of the first diaphragm 31 and the second diaphragm 32 of the sound generating device 100 are radiated to the outside through the front cavity 840 and the sound outlet hole 820.

[0158] In the embodiment, the first cavity 13 of the sound generating device 100 communicates with the rear cavity 850 through the first leakage hole 111, and the second side of the second diaphragm 32 communicates with the rear cavity. In an embodiment, the device housing 800 is further provided with a second leakage hole 830 which communicates with the rear cavity 850.

[0159] In an embodiment, the device housing 800 is further provided with a second leakage hole 830 which communicates with the rear cavity 850, and the second side of the second diaphragm 32 communicates with the rear cavity 850. It can be understood that, as shown in Figure 9 the lower shell of the device housing 800 is provided with the second leakage hole 830 which communicates with the rear cavity 850, and the first diaphragm 31 and the second diaphragm 32 radiate sound waves to the rear cavity 850 which are opposite in phase to the sound waves of the front cavity 840, and the sound waves of the rear cavity 850 are radiated to the outside through the second leakage hole 830. Optionally, a damping member which adjusts the sound resistance is arranged on the second leakage hole 830.

[0160] In the embodiment, the second leakage hole 830 is arranged on the lower shell of the device shell 800, and the second leakage hole 830 is in communication with the rear cavity 850 and is used for adjusting the pressure in the rear cavity 850 and further adjusting the air pressure of the first cavity 13. At the same time, the sound waves of the rear cavity 850 are radiated to the outside through the second leakage hole 830, and the sound waves of the rear cavity 850 and the sound waves of the front cavity 840 are opposite in phase, which can play a role of a sound dipole, realize far-field noise elimination, and protect user privacy.

[0161] In the embodiment, the second leakage hole 830 can be a circular hole, an elliptical hole or a polygonal hole, which is not limited herein. The number of the second leakage hole 830 can be one or more, which is not limited herein according to actual application design.

[0162] In the embodiment, the upper shell includes a top wall and a first side wall, and the lower shell includes a bottom wall and a second side wall, the first side wall and the second side wall are jointly formed as a side wall of the electronic device shell, that is, the device shell includes oppositely arranged top and bottom walls and a side wall connecting the top and bottom walls. Optionally, the sound outlet hole is arranged on the top wall or a connecting region of the side wall and the top wall, and the second leakage hole is arranged on the side wall or the bottom wall or a connecting region of the side wall and the bottom wall. In this way, the sound performance of the electronic device 900 and the technical effect of protecting privacy can be considered, and the most suitable design scheme is selected according to actual needs during use, which is not limited herein.

[0163] The above is only an optional embodiment of the utility model, and does not limit the patent range of the utility model, and any equivalent structural transformation or direct / indirect application in other related technical fields based on the concept of the utility model and the content of the utility model specification and drawings is included in the patent protection range of the utility model.

Claims

1. A sound producing device, characterized by, The sound production device comprises: a shell; a magnetic circuit system connected with the shell, the magnetic circuit system comprising a central magnetic part, a side magnetic part, and a magnetic yoke connecting the central magnetic part and the side magnetic part, a first magnetic gap being formed between the side magnetic part and the magnetic yoke, a second magnetic gap being formed between the central magnetic part and the magnetic yoke, the first magnetic gap being arranged around the second magnetic gap; a support arranged on a side of the magnetic yoke away from the central magnetic part and enclosing the magnetic yoke to form an airflow cavity, the magnetic yoke being provided with a first through hole communicating the second magnetic gap and the airflow cavity, the support being provided with a second through hole communicating the airflow cavity, the magnetic circuit system being further provided with a through hole penetrating the central magnetic part and the magnetic yoke in sequence, the through hole being in communication with the airflow cavity; and a vibration system comprising a first diaphragm, a second diaphragm, a first voice coil, and a second voice coil, an outer periphery of the first diaphragm being connected with the shell, an inner periphery of the first diaphragm being connected with the support, and the inner periphery of the first diaphragm being provided with a third through hole communicating the second through hole, an outer periphery of the second diaphragm being connected with the shell and being opposite to and spaced from the magnetic circuit system, the first diaphragm and the second diaphragm being located on opposite sides of the magnetic circuit system, one end of the first voice coil being connected with the first diaphragm, the other end of the first voice coil being suspended in the first magnetic gap, one end of the second voice coil being connected with the second diaphragm, the other end of the second voice coil being suspended in the second magnetic gap; wherein sound waves on a first side of the second diaphragm are radiated outward through the first through hole, the through hole, the airflow cavity, the second through hole, and the third through hole, and are radiated outward together with sound waves on a first side of the first diaphragm on the same side of the sound production device.

2. The sound production device of claim 1, wherein The magnetic yoke comprises a first top plate, a first bottom plate, and a first side plate connecting the first top plate and the first bottom plate, the first bottom plate being connected with the shell, the central magnetic part being arranged on the first top plate and being spaced from the first side plate to enclose the second magnetic gap, the side magnetic part being arranged on the first bottom plate and being spaced from the first side plate to enclose the first magnetic gap; wherein the first top plate is provided with the first through hole, the support is arranged on a side of the first top plate away from the central magnetic part and encloses the first top plate to form the airflow cavity, and the through hole penetrates the central magnetic part and the first top plate in sequence.

3. The sound production device of claim 2, wherein The first top plate comprises a protruding part and a supporting part connected with each other, the protruding part being formed by the first top plate protruding towards the central magnetic part so that the supporting part is arranged around the protruding part; wherein the supporting part is provided with the first through hole, the central magnetic part is arranged on the protruding part and is spaced from the supporting part to enclose an airflow passage, the airflow passage communicating the second magnetic gap and the first through hole, the support is connected on a side of the supporting part away from the airflow passage, and the through hole penetrates the central magnetic part and the protruding part in sequence.

4. The sound production device of claim 3, wherein The side of the support part facing the support piece is recessed to form a support groove towards the airflow passage, and the periphery of the support piece is limited in the support groove; And / or, the connection between the protruding part and the support part forms an inclined surface, and the first through hole penetrates the support part and the inclined surface in sequence; And / or, the first through hole includes a plurality of first through holes, and the plurality of first through holes are arranged in intervals and arranged around the protruding part; And / or, the first through hole is an arc-shaped hole extending along the periphery of the protruding part; And / or, the first bottom plate is provided with a recess corresponding to the first magnetic gap, and the recess is used to provide a recess for the first voice coil; And / or, the first top plate and the first bottom plate are connected to the two ends of the first side plate along the vibration direction of the vibration system; And / or, the area of the first top plate is defined as S1, and the opening area of the first through hole is defined as S2, S2=(10%-80%)S1; And / or, the center magnetic part includes a center magnet and a center magnetic guide plate arranged in layers, the center magnet is connected to the protruding part, and the through hole penetrates the center magnetic guide plate, the center magnet and the protruding part in sequence.

5. The sound production device of claim 1, wherein The support piece includes a second top plate, a second side plate arranged on the periphery of the second top plate, and a second bottom plate formed by extending the end of the second side plate away from the second top plate towards the outside, the second bottom plate is connected to the side of the magnetic yoke away from the center magnetic part, so that the second top plate, the second side plate and the magnetic yoke form the airflow cavity; Wherein, the second top plate is provided with the second through hole, and the inner periphery of the first diaphragm is connected to the side of the second top plate away from the airflow cavity, so that the third through hole and the second through hole are communicated.

6. The sound production device of claim 5, wherein, The second through hole is one, and the second through hole and the third through hole are communicated in correspondence; or, the second through hole includes a plurality of second through holes, and the plurality of second through holes are arranged in intervals; And / or, the area of the second top plate is defined as S3, and the opening area of the second through hole is defined as S4, S4=(10%-80%)S3; And / or, the support piece is a metal piece, and the second bottom plate and the magnetic yoke are adhesively connected or welded; or, the support piece is an injection molded part, and the support piece and the magnetic yoke are integrally injection molded.

7. The sound production device of claim 1, wherein The first diaphragm includes an inner folding ring, a vibration part and an outer folding ring connected in sequence, the inner side of the inner folding ring is provided with the third through hole and connected with the support piece, the outer side of the outer folding ring is connected with the shell, and the first voice coil is connected with the vibration part.

8. The sound production device of claim 7, wherein, The first diaphragm further includes a vibration plate arranged between the vibration part and the first voice coil; And / or, the shell includes a first shell and a second shell connected, the end of the first shell away from the second shell is connected with the outer side of the first diaphragm, the side of the second shell away from the first shell is connected with the outer periphery of the second diaphragm, and the outer periphery of the magnetic yoke is connected with the side of the second shell away from the second diaphragm.

9. The sound production device of claim 1, wherein, The second vibrating diaphragm comprises a folded ring portion and a reinforcing portion, the folded ring portion is arranged around the reinforcing portion, an outer edge of the folded ring portion is connected with the shell, and the second voice coil is connected with the reinforcing portion; Wherein, the outer contour of the reinforcing portion is circular, the through hole is a circular hole, the diameter of the reinforcing portion is defined as D1, the diameter of the through hole is defined as D2, and D2≥0.3D1; or, the projection area of the through hole along the vibration direction of the vibration system is defined as S5, the projection area of the reinforcing portion along the vibration direction of the vibration system is defined as S6, and S5≥8.5%*S6.

10. The sound production device of claim 1, wherein, The first vibrating diaphragm and the second vibrating diaphragm vibrate in the same direction, the first side of the first vibrating diaphragm and the second vibrating diaphragm radiate the first sound wave to the external environment, the second side of the first vibrating diaphragm and the second vibrating diaphragm radiate the second sound wave to the external environment, and the first sound wave and the second sound wave are opposite in phase; Alternatively, the sound generating device is applied to an electronic device and is used to divide the space of the electronic device into an acoustically isolated front cavity and a back cavity, the first side of the first vibrating diaphragm and the second vibrating diaphragm communicates with the front cavity, the second side of the first vibrating diaphragm and the second vibrating diaphragm communicates with the back cavity, the first vibrating diaphragm and the second vibrating diaphragm vibrate in the same direction, radiate the first sound wave to the front cavity, and radiate the second sound wave to the back cavity, and the first sound wave and the second sound wave are opposite in phase; And / or, the first vibrating diaphragm is annular, the inner edge of the first vibrating diaphragm forms the third through hole, and the sound generating device further comprises a first air permeable member connected to the inner edge of the first vibrating diaphragm and covering the third through hole; And / or, a first cavity is formed between the first vibrating diaphragm, the shell, the magnetic yoke and the support, the sound generating device is provided with a first leakage hole communicating the first cavity with the outside, and the sound generating device further comprises a second air permeable member covering the first leakage hole.

11. The sound production device of any one of claims 1 to 10, wherein, The edge magnetic portion comprises an edge magnet and an edge magnetic plate arranged in layers, the edge magnet is connected with the magnetic yoke, and the edge magnetic plate is in an integrated structure with the shell; And / or, the sound generating device further comprises a first positioning ring arranged between the outer periphery of the first vibrating diaphragm and the shell; And / or, the sound generating device further comprises a second positioning ring arranged between the outer periphery of the second vibrating diaphragm and the shell; And / or, the sound generating device further comprises a front cover located on the side of the first vibrating diaphragm away from the second vibrating diaphragm, a second cavity is formed between the first vibrating diaphragm and the front cover, the front cover is provided with a fourth through hole communicating the second cavity with the outside, and the sound waves of the first vibrating diaphragm and the second vibrating diaphragm are radiated to the external environment through the fourth through hole.

12. An electronic device, comprising: The electronic device comprises: a device shell provided with a receiving cavity; and The sound generating device according to any one of claims 1 to 11 is arranged in the receiving cavity and divides the receiving cavity into a front cavity and a back cavity which are isolated from each other, and the first side of the first vibrating diaphragm and the second vibrating diaphragm communicates with the front cavity; The device housing is provided with a sound outlet hole communicating with the front cavity, and sound waves on the first side of the first diaphragm and the second diaphragm of the sound generating device are radiated to the outside through the front cavity and the sound outlet hole.

13. The electronic device of claim 12, wherein, The device housing is further provided with a second leakage hole communicating with the rear cavity. The first diaphragm and the second diaphragm radiate sound waves to the rear cavity, and the phase of the sound waves is opposite to that of the sound waves in the front cavity, and the sound waves in the rear cavity are radiated to the outside through the second leakage hole.

14. The electronic device of claim 13, wherein, The device housing comprises a top wall and a bottom wall arranged oppositely and a side wall connecting the top wall and the bottom wall. The sound outlet hole is arranged on the top wall or the connecting region of the side wall and the top wall, and the second leakage hole is arranged on the side wall or the bottom wall or the connecting region of the side wall and the bottom wall.

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