Sound production device and electronic equipment

Abstract

The invention discloses a sound production device and electronic equipment, and relates to the technical field of electroacoustic transduction, a magnetic conductive yoke of a magnetic circuit system of the sound production device and an injection molding support are integrally injection-molded, the injection molding support is provided with a first through hole, a first magnetic gap is formed between a central magnetic part and the magnetic conductive yoke, and the central magnetic part is provided with a second through hole; a second magnetic gap surrounding the first magnetic gap is formed between the edge magnetic part and the magnetic conductive yoke, 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, the inner periphery of the second vibrating diaphragm is connected with the injection molding support and provided with a third through hole, and the first voice coil and the second voice coil are suspended in the first magnetic gap and the second magnetic gap respectively. According to the sound production device, the falling reliability risk is reduced, the structural firmness of a product is improved, and the high-frequency performance is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electroacoustic transducer, and in particular to a sound-generating device and electronic equipment using the sound-generating device. Background Art

[0002] In recent years, with the rapid development of consumer electronic products, electronic devices such as headphones, smart phones, and VR devices have been recognized by consumers and widely used. Those skilled in the art have also made corresponding improvements to related supporting products such as headphones to meet the performance requirements of electronic products and meet consumers' needs for product performance.

[0003] The sound-generating device is an important electroacoustic transducer component in consumer electronic products, and is widely used as a speaker, 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 the related art, a sound-generating device is proposed, wherein a first diaphragm and a second diaphragm are respectively provided on opposite sides of the magnetic circuit system of the sound-generating device, the magnetic circuit system comprises an integrally stretched magnetic yoke, the center magnet and the side magnet of the magnetic circuit system are respectively provided on different supporting walls of the magnetic yoke, and the inner periphery of one side of the diaphragm is also fixed on the top wall of the magnetic yoke. Although the above structure can achieve the effect of improving the acoustic performance of the sound-generating device, the above structure design is relatively extreme, the bonding area between the magnet of the magnetic circuit system and the magnetic yoke and between the diaphragm and the magnetic yoke is small, the reliability risk of the product is high, and the service life of the product is greatly affected. Summary of the invention

[0004] The main purpose of the present invention is to provide a sound-emitting device and an electronic device, aiming to provide a sound-emitting device that effectively improves high-frequency performance. The sound-emitting device not only reduces the risk of falling reliability and improves the firmness of the product structure, but also effectively improves the high-frequency performance, thereby improving the sound performance of the entire machine.

[0005] To achieve the above object, the present invention provides a sound-generating device, comprising:

[0006] shell;

[0007] A magnetic circuit system, wherein the magnetic circuit system comprises a central magnetic portion, a side magnetic portion, a magnetic yoke and an injection molded bracket, wherein the inner edge of the magnetic yoke is integrally injection molded with the injection molded bracket, wherein the injection molded bracket is provided with a first through hole, wherein the central magnetic portion is connected to the magnetic yoke and the injection molded bracket, and a first magnetic gap is formed between the central magnetic portion and the magnetic yoke, wherein the central magnetic portion is provided with a second through hole corresponding to and communicating with the first through hole, wherein the side magnetic portion is connected to the magnetic yoke, and a second magnetic gap is formed between the side magnetic portion and the magnetic yoke, and wherein the second magnetic gap is arranged around the first magnetic gap; and

[0008] A vibration system, the vibration system comprising a first diaphragm, a second diaphragm, a first voice coil and a second voice coil, the first diaphragm and the second diaphragm are located on opposite sides of the magnetic circuit system, the outer periphery of the first diaphragm is connected to the housing, and is opposite to and spaced from the magnetic circuit system, the outer periphery of the second diaphragm is connected to the housing, the inner periphery of the second diaphragm is connected to the injection molded bracket, and the inner periphery of the second diaphragm is provided with a third through hole connected to the first through hole, one end of the first voice coil is connected to the first diaphragm, and the other end of the first voice coil is suspended in the first magnetic gap, one end of the second voice coil is connected to the second diaphragm, and the other end of the second voice coil is suspended in the second magnetic gap.

[0009] In one 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, an end of the first bottom plate away from the first side plate is connected to the housing, and an inner periphery of the first top plate is integrally injection molded with the injection molded bracket;

[0010] The central magnetic portion is arranged on the side of the first top plate and the injection molded bracket close to the first bottom plate, and is spaced from the first side plate to enclose the first magnetic gap. The edge magnetic portion is arranged on the side of the first bottom plate close to the first top plate, and is spaced from the first side plate to enclose the second magnetic gap.

[0011] In one embodiment, the injection-molded bracket is provided with a first embedding groove, the inner periphery of the first top plate is provided with a first embedding portion, and the first embedding portion is embedded in the first embedding groove;

[0012] And / or, a side of the injection-molded bracket facing the central magnetic part is flush with a side of the first top plate facing the central magnetic part;

[0013] And / or, a side of the injection-molded bracket facing away from the central magnetic portion protrudes out of a side of the first top plate facing away from the central magnetic portion, and is connected to an inner periphery of the second diaphragm;

[0014] And / or, the first bottom plate is provided with an avoidance groove corresponding to the second magnetic gap, and the avoidance groove is recessed and extends in a direction away from the second voice coil;

[0015] And / or, the first top plate and the first bottom plate are connected to two ends of the first side plate along the vibration direction of the vibration system;

[0016] And / or, the magnetic yoke is integrally stretched to form the first bottom plate, the first side plate and the first top plate which are connected in sequence;

[0017] And / or, the central magnetic part includes a central magnet and a central magnetic conductive plate which are stacked, the central magnet is connected to the first top plate and the injection molded bracket, and the second through hole passes through the central magnetic conductive plate and the central magnet in sequence.

[0018] In one embodiment, the outer shell includes a first shell and a second shell connected to each other, wherein one end of the first shell away from the second shell is connected to the outer side of the first diaphragm, the side of the second shell facing away from the first shell is connected to the outer periphery of the second diaphragm, and the outer periphery of the magnetic yoke is connected to the first shell.

[0019] In one embodiment, the first housing is a plastic housing;

[0020] The outer periphery of the magnetic yoke is integrally injection molded with the first shell; wherein the first shell is provided with a second embedding groove, the outer periphery of the magnetic yoke is provided with a second embedding portion, and the second embedding portion is embedded in the second embedding groove; or, a support platform is convexly provided on the inner wall of the first shell, and the outer periphery of the magnetic yoke is supported on the support platform and bonded to the support platform;

[0021] And / or, the side magnetic part includes a stacked side magnet and a side magnetic conductive plate, the side magnet is connected to the magnetic conductive yoke, and the side magnetic conductive plate and the second shell are an integrally formed structure.

[0022] In one embodiment, the first diaphragm includes a folded ring portion and a dome, the folded ring portion is arranged around the dome, the outer edge of the folded ring portion is connected to the housing, the first voice coil is connected to the dome, and the second through hole, the first through hole and the third through hole are connected in sequence to form a through hole;

[0023] Among them, the outer contour of the spherical top is circular, the through hole is a circular hole, the diameter of the spherical top 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 S1, and the projection area of ​​the spherical top along the vibration direction of the vibration system is defined as S2, and S1≥8.5%*S2.

[0024] In one embodiment, the second diaphragm includes an inner fold ring, a vibration part and an outer fold ring which are connected in sequence, the inner side of the inner fold ring is provided with the third through hole and is connected to the injection molded bracket, the outer side of the outer fold ring is connected to the housing, and the second voice coil is connected to the vibration part;

[0025] Wherein, the second diaphragm further includes a vibration plate, and the vibration plate is arranged between the vibration part and the second voice coil.

[0026] In one embodiment, the first diaphragm and the second diaphragm vibrate in the same direction and radiate sound waves of the same phase outward;

[0027] And / or, the second diaphragm is an annular diaphragm, the inner edge of the second diaphragm forms the third through hole, and the sound-generating device further comprises a first air-permeable member, the first air-permeable member is connected to the inner edge of the first diaphragm and covers the third through hole;

[0028] And / or, a first cavity is formed between the second diaphragm, the housing, the magnetic yoke and the injection molded bracket, the sound-emitting device is provided with a first leakage hole connecting the first cavity with the outside, and the sound-emitting device also includes a second air-permeable member covering the first leakage hole.

[0029] In one embodiment, the sound-generating device further comprises a first supporting ring, wherein the first supporting ring is disposed between the outer periphery of the first diaphragm and the housing;

[0030] And / or, the sound-generating device further comprises a second supporting ring, wherein the second supporting ring is arranged between the outer periphery of the second diaphragm and the housing;

[0031] And / or, the sound-generating device further includes a front cover, the front cover is located on a side of the first diaphragm away from the second diaphragm, a second cavity is formed between the first diaphragm and the front cover, and the front cover is provided with a fourth through hole connecting the second cavity and the outside.

[0032] The present invention further provides an electronic device, comprising:

[0033] A device housing, wherein the device housing is provided with a receiving cavity; and

[0034] The sound-generating device described above is arranged in the receiving chamber, and divides the receiving chamber into a front chamber and a rear chamber that are isolated from each other;

[0035] The device housing is provided with a sound outlet hole connected to the front cavity, and the sound waves of the first diaphragm and the second diaphragm of the sound-generating device are radiated to the outside through the sound outlet hole.

[0036] The sound-generating device of the technical solution of the present invention is configured such that a magnetic circuit system and a vibration system are housed in a housing, and a first magnetic gap and a second magnetic gap are arranged on the magnetic circuit system, so that the second magnetic gap is arranged around the first magnetic gap, and the vibration system is configured such that a first diaphragm, a second diaphragm, a first voice coil and a second voice coil are arranged on opposite sides of the magnetic circuit system respectively and connected to the housing, and one end of the first voice coil is connected to the first diaphragm, and the other end of the first voice coil is suspended in the first magnetic gap, one end of the second voice coil is connected to the second diaphragm, and the other end of the second voice coil is suspended in the second magnetic gap, so that Current is passed through the voice coil, so that the first voice coil and the second voice coil convert electrical energy into mechanical energy in the first magnetic gap and the second magnetic gap formed by the magnetic circuit system, respectively, to drive the first voice coil and the second voice coil to respectively drive the first diaphragm and the second diaphragm to vibrate. Not only can the two diaphragms with the two voice coils be driven to vibrate by one magnetic circuit system to achieve sound generation, but also the double-sided diaphragms can generate sound in the same direction without increasing the external dimensions, and the vibration area of ​​the vibration system is increased, thereby achieving the purpose of improving performance. Furthermore, by arranging the magnetic circuit system as a central magnetic part, a side magnetic part, a magnetic yoke and an injection molded bracket, and the inner edge of the magnetic yoke is aligned with the injection molded bracket. The frame is integrally injection molded, so that the central magnetic part is connected to the magnetic yoke and the injection molding bracket, and a first magnetic gap is formed between the central magnetic part and the magnetic yoke, and the side magnetic part is connected to the magnetic yoke, and a second magnetic gap is formed between the side magnetic part and the magnetic yoke, and the injection molding bracket is used to connect and fix the inner periphery of the second diaphragm. In this way, the injection molding bracket is used to increase the connection area with the second diaphragm, and the magnetic yoke and the injection molding bracket are used to fix the central magnetic part at the same time, thereby increasing the bonding area of ​​the central magnet, improving the installation stability, and reducing the reliability risk. In addition, a first through hole is provided in the injection molding bracket, and a second through hole corresponding to the first through hole is provided in the central magnetic part, and the second diaphragm is provided with a second through hole. A third through hole connected to the first through hole is provided on the inner periphery, so that the first diaphragm radiates sound waves outward through the second through hole, the first through hole and the third through hole in sequence, so that the sound waves of the first diaphragm and the second diaphragm are radiated outward on the same side of the sound-emitting device, which is beneficial to the superposition of compressed air when the first diaphragm and the second diaphragm vibrate, thereby improving the loudness and sensitivity of the sound-emitting device. The air flow channel formed by the second through hole, the first through hole and the third through hole being connected in sequence effectively increases the air flow area when the first diaphragm vibrates, thereby ensuring smoother air flow, improving the high-frequency performance of the first diaphragm, and thus improving the high-frequency performance after the first diaphragm and the second diaphragm are superimposed. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0038] Figure 1 A schematic structural diagram of an embodiment of a sound-generating device provided by the present invention;

[0039] Figure 2 A cross-sectional schematic diagram of an embodiment of a sound-generating device provided by the present invention;

[0040] Figure 3 An exploded schematic diagram of an embodiment of a sound-generating device provided by the present invention;

[0041] Figure 4 An exploded schematic diagram of another embodiment of the sound-generating device provided by the present invention;

[0042] Figure 5 It is a structural schematic diagram of an integrated structure of a first housing, a magnetic yoke and an injection-molded bracket in one embodiment of the present invention;

[0043] Figure 6 It is a cross-sectional schematic diagram of an integrated structure of a first housing, a magnetic yoke and an injection-molded bracket in one embodiment of the present invention;

[0044] Figure 7 It is a cross-sectional schematic diagram of the connection between the first housing, the magnetic yoke and the injection-molded bracket in another embodiment of the present invention;

[0045] Figure 8 It is a structural schematic diagram of the integrated structure of the magnetic yoke and the injection molded bracket in one embodiment of the present invention.

[0046] Description of Figure Numbers:

[0047] 100, sound-generating device; 1, housing; 11, first housing; 111, second embedding groove; 112, support platform; 12, second housing; 121, first leakage hole; 13, first cavity; 2, magnetic circuit system; 21, magnetic yoke; 211, first top plate; 2111, first embedding part; 212, first bottom plate; 2121, avoidance groove; 2122, second embedding part; 213, first side plate; 22, central magnetic part; 221, central magnet; 222, central magnetic plate; 223, second through hole; 23, side magnetic part; 231, side magnet; 232, side magnetic plate; 24 , injection-molded bracket; 241, first through hole; 242, first embedded groove; 25, first magnetic gap; 26, second magnetic gap; 3, vibration system; 31, first diaphragm; 311, folding ring; 312, dome; 32, second diaphragm; 321, inner folding ring; 322, vibration part; 323, outer folding ring; 324, third through hole; 325, vibration plate; 33, first voice coil; 34, second voice coil; 4, through hole; 51, first support ring; 52, second support ring; 61, first air permeable member; 62, second air permeable member; 7, front cover; 71, second cavity; 72, fourth through hole.

[0048] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0051] At the same time, the meaning of "and / or" or "and / or" appearing in the full text includes three options. Taking "A and / or B" as an example, it includes option A, or option B, or a option in which both A and B are satisfied.

[0052] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0053] The present invention provides a sound-generating device 100. It can be understood that the sound-generating device 100 is applied to an electronic device, and the electronic device can be a mobile phone, an earphone, a smart wearable device, etc., which is not limited here.

[0054] Please refer to Figures 1 to 8 As shown, in the embodiment of the present invention, the sound-generating device 100 includes a housing 1, a magnetic circuit system 2 and a vibration system 3, wherein the magnetic circuit system 2 includes a central magnetic portion 22, a side magnetic portion 23, a magnetic yoke 21 and an injection molded bracket 24, the inner edge of the magnetic yoke 21 and the injection molded bracket 24 are integrally injection molded, the injection molded bracket 24 is provided with a first through hole 241, the central magnetic portion 22 is connected to the magnetic yoke 21 and the injection molded bracket 24, and a first magnetic gap 25 is formed between the central magnetic portion 22 and the magnetic yoke 21, the central magnetic portion 22 is provided with a second through hole 223 corresponding to and communicating with the first through hole 241, the side magnetic portion 23 is connected to the magnetic yoke 21, and a second magnetic gap 26 is formed between the magnetic yoke 21, and the second magnetic gap 26 is arranged around the first magnetic gap 25, and the vibration system The system 3 includes a first diaphragm 31, a second diaphragm 32, a first voice coil 33 and a second voice coil 34. The first diaphragm 31 and the second diaphragm 32 are located on opposite sides of the magnetic circuit system 2. The outer periphery of the first diaphragm 31 is connected to the outer shell 1, and is opposite to and spaced from the magnetic circuit system 2. The outer periphery of the second diaphragm 32 is connected to the outer shell 1, and the inner periphery of the second diaphragm 32 is connected to the injection molding bracket 24, and the inner periphery of the second diaphragm 32 is provided with a third through hole 324 connected to the first through hole 241. One end of the first voice coil 33 is connected to the first diaphragm 31, and 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 to the second diaphragm 32, and the other end of the second voice coil 34 is suspended in the second magnetic gap 26.

[0055] In this embodiment, the sound-generating device 100 may be a sound-generating unit of a speaker, and the speaker may be a micro speaker. It should be noted that the magnetic circuit system 2 and the vibration system 3 of the sound-generating device 100 are arranged opposite to each other.

[0056] It can be understood that the housing 1 is used to install, fix and support components such as the magnetic circuit system 2 and the vibration system 3, that is, the housing 1 provides an installation base for components such as the magnetic circuit system 2 and the vibration system 3. Optionally, the housing 1 can be an integral structure or a plurality of separate structures, which is not limited here.

[0057] The shell 1 in this embodiment can be selected as a frame or a frame structure, that is, the shell 1 has a cavity with openings at both ends, the magnetic circuit system 2 is accommodated in the cavity of the shell 1 and connected to the shell 1, and the first diaphragm 31 and the second diaphragm 32 of the vibration system 3 are respectively arranged on the 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 dual diaphragm structure, so that a magnetic circuit system 2 is used to drive the two diaphragms of the two voice coils of the vibration system 3 to vibrate to achieve sound, and at the same time, the double-sided diaphragms can achieve sound in the same direction without increasing the external dimensions, and the vibration area of ​​the vibration system 3 is increased, thereby achieving the purpose of improving performance.

[0058] In this embodiment, the housing 1 is provided with conductive terminals, and the first voice coil 33 and the second voice coil 34 are both electrically connected to the conductive terminals, so that the sound-generating device 100 can conveniently connect the first voice coil 33 and the second voice coil 34 to the external circuit through the conductive terminals.

[0059] It should be noted that the sound-generating device 100 has a first side and a second side that are opposite to each other, the first side refers to a side of the second diaphragm 32 away from the first diaphragm 31, and the second side refers to a side of the first diaphragm 31 away from the second diaphragm 32. The first side and the second side can be understood as orientation or direction.

[0060] In this embodiment, the sound waves of the first diaphragm 31 are radiated outward through the second through hole 223, the first through hole 241 and the third through hole 324, and 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, that is, the sound waves of the first side of the first diaphragm 31 are radiated outward through the second through hole 223, the first through hole 241 and the third through hole 324, 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. In this way, the sound waves of the first diaphragm 31 and the sound waves of the second diaphragm 32 in the vibration system 3 can be superimposed to produce sound, thereby improving the sound effect and performance.

[0061] Optionally, the first diaphragm 31 and the second diaphragm 32 vibrate in the same direction and radiate sound waves with the same phase to the outside, which can increase the volume of the sound-generating device 100 .

[0062] In this embodiment, the housing 1 is used to accommodate and fix the structures such as the vibration system 3 and the magnetic circuit system 2, so that the sound device 100 can be used as an independent component in an electronic device or a sound module, which is not limited here. It can be understood that the outer contour of the sound device 100 can be circular or square, so that the outer contours of the housing 1, the magnetic circuit system 2 and the vibration system 3 are correspondingly set to be circular or square, which is specifically designed according to actual needs and is not limited here.

[0063] Optionally, the housing 1 is a cylindrical structure, that is, the two ends of the housing 1 have openings, and are in the shape of a circular cylinder with openings at both ends. The outer peripheral contours of the first diaphragm 31 and the second diaphragm 32 of the vibration system 3 are roughly aligned and similar to the outer contour of the housing 1. The first diaphragm 31 and the second diaphragm 32 are respectively connected to the openings at both ends of the housing 1. The magnetic circuit system 2 is arranged in the cavity of the housing 1 and is located between the first diaphragm 31 and the second diaphragm 32. This facilitates the regular design of the outer shape of the sound-generating device 100, further facilitates assembly in the whole machine, and simplifies the reserved structure of the whole machine.

[0064] In this embodiment, if Figures 1 to 7 As shown, the housing 1 includes a first shell 11 and a second shell 12 connected to each other, the end of the first shell 11 away from the second shell 12 is connected to the outer side of the first diaphragm 31, the side of the second shell 12 facing away from the first shell 11 is connected to the outer periphery of the second diaphragm 32, and the outer periphery of the magnetic yoke 21 is connected to the first shell 11.

[0065] It can be understood that the first shell 11 and the second shell 12 of the housing 1 can be optionally cylindrical, so that the first shell 11 and the second shell 12 are adapted to be connected to form a cylindrical housing 1. By designing the housing 1 as a first shell 11 and a second shell 12 that are separately arranged, 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 the assembly process. In this embodiment, the first shell 11 and the second shell 12 of the housing 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.

[0066] In this embodiment, the magnetic circuit system 2 is provided with a central magnetic portion 22, a side magnetic portion 23, a magnetic yoke 21 and an injection molded bracket 24, and the injection molded bracket 24 is integrally injection molded on the inner edge of the magnetic yoke 21, the magnetic yoke 21 and the injection molded bracket 24 are used to cooperate and install the central magnetic portion 22, and the central magnetic portion 22 and the magnetic yoke 21 are separated to form a first magnetic gap 25, and the side magnetic portion 23 is installed and fixed by the magnetic yoke 21, so that a second magnetic gap 26 is formed between the side magnetic portion 23 and the magnetic yoke 21, and the side magnetic portion 23 is located on the outside of the central magnetic portion 22, so that the second magnetic gap 26 is arranged around the first magnetic gap 25, so that the first voice coil 33 and the second voice coil 34 of the vibration system 3 are respectively connected to the first magnetic gap 25 and the second The first voice coil 33 and the second voice coil 34 correspond to each other, and a conductive terminal is arranged on the housing 1, so that the first voice coil 33 and the second voice coil 34 are both electrically connected to the conductive terminal. In this way, current is passed through 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 electrical 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, not only the two voice coils are driven by one magnetic circuit system 2 to drive the two diaphragms to vibrate to achieve sound generation, but also the double-sided diaphragms can generate sound in the same direction without increasing the external dimensions, and the vibration area of ​​the vibration system 3 is increased, thereby achieving the purpose of improving performance.

[0067] In order to realize that the sound waves on 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, and the sound waves are superimposed and enhanced on each other, thereby improving the high-frequency performance. In this embodiment, the inner edge of the magnetic yoke 21 is integrally injection-molded with the injection molding bracket 24, and a first through hole 241 is provided in the injection molding bracket 24, and a second through hole 223 corresponding to and connected to the first through hole 241 is provided in the central magnetic portion 22, and the inner periphery of the second diaphragm 32 is connected to the injection molding bracket 24, and a third through hole 324 connected to the first through hole 241 is provided on the inner periphery of the second diaphragm 32, so that the sound waves on the first side of the first diaphragm 31 are radiated outward through the second through hole 223, the first through hole 241 and the third through hole 324 in sequence, that is, the second through hole 223, the first through hole 241 and the third through hole 324 are connected in sequence to form an air flow channel, so that the first diaphragm 31 and The sound waves of the second diaphragm 32 radiate outward on the same side of the sound-emitting device 100, which is beneficial to the superposition of compressed air when the first diaphragm 31 and the second diaphragm 32 vibrate, thereby improving the loudness and sensitivity of the sound-emitting device 100; at the same time, the second diaphragm 32 and the central magnetic part 22 are respectively installed and fixed using the injection molding bracket 24 and the magnetic yoke 21 to improve the installation stability, thereby reducing the reliability risk, and the airflow channel formed by the second through hole 223, the first through hole 241 and the third through hole 324 effectively increases the airflow flow area when the first diaphragm 31 vibrates, thereby ensuring smoother airflow, improving the high-frequency performance of the first diaphragm 31, and thus improving the high-frequency performance after the first diaphragm 31 and the second diaphragm 32 are superimposed.

[0068] The sound-generating device 100 of the present invention is configured such that the magnetic circuit system 2 and the vibration system 3 are housed in the housing 1, and the first magnetic gap 25 and the second magnetic gap 26 are arranged on the magnetic circuit system 2, so that the second magnetic gap 26 is arranged around the first magnetic gap 25, and the vibration system 3 is configured to be a first diaphragm 31, a second diaphragm 32, a first voice coil 33 and a second voice coil 34, so that the first diaphragm 31 and the second diaphragm 32 are respectively arranged on opposite sides of the magnetic circuit system 2 and connected to the housing 1, and one end of the first voice coil 33 is connected to the first diaphragm 31, the other end of the first voice coil 33 is suspended in the first magnetic gap 25, and one end of the second voice coil 34 is connected to the second diaphragm 32. , the other end of the second voice coil 32 is suspended in the second magnetic gap 26, so that current is passed through 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 electrical 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 respectively drive the first diaphragm 31 and the second diaphragm 32 to vibrate, not only to achieve sound generation through one magnetic circuit system 2 to drive the two diaphragms of the two voice coils to vibrate, but also to achieve the same-direction sound generation of the double-sided diaphragms without increasing the external dimensions, and to increase the vibration area of ​​the vibration system 3, thereby achieving the purpose of improving performance;Furthermore, by configuring the magnetic circuit system 2 to include a central magnetic portion 22, a side magnetic portion 23, a magnetic yoke 21 and an injection molding bracket 24, and integrally molding the inner edge of the magnetic yoke 21 and the injection molding bracket 24, the central magnetic portion 22 is connected to the magnetic yoke 21 and the injection molding bracket 24, and a first magnetic gap 25 is formed between the central magnetic portion 22 and the magnetic yoke 21, the side magnetic portion 23 is connected to the magnetic yoke 21, and a second magnetic gap 26 is formed between the central magnetic portion 22 and the magnetic yoke 21, and the injection molding bracket 24 is used to connect and fix the inner periphery of the second diaphragm 32. In this way, the injection molding bracket 24 is used to increase not only the connection area with the second diaphragm 32, but also the magnetic yoke 21 and the injection molding bracket 24 are used to fix the central magnetic portion 22 at the same time, thereby increasing the bonding area of ​​the central magnet 221, improving the installation stability, and reducing the reliability risk. In addition, by providing a first through hole 241 in the injection molding bracket 24 and providing a first through hole 242 in the central magnetic portion 22, a second magnetic gap 26 is formed between the central magnetic portion 22 and the injection molding bracket 24. There is a second through hole 223 correspondingly connected to the first through hole 241, and a third through hole 324 connected to the first through hole 241 is provided on the inner periphery of the second diaphragm 32, so that the first diaphragm 31 radiates sound waves outward through the second through hole 223, the first through hole 241 and the third through hole 324 in sequence, 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 conducive to the superposition of compressed air when the first diaphragm 31 and the second diaphragm 32 vibrate, thereby improving the loudness and sensitivity of the sound-generating device 100, and the air flow channel formed by the second through hole 223, the first through hole 241 and the third through hole 324 are connected in sequence, which effectively increases the air flow area when the first diaphragm 31 vibrates, thereby ensuring smoother air flow, improving the high-frequency performance of the first diaphragm 31, and thus improving the high-frequency performance of the first diaphragm 31 and the second diaphragm 32 after superposition. ;

[0069] In this embodiment, the magnetic yoke 21 is a metal magnetic plate. Optionally, the injection molded bracket 24 is a plastic part. It can be understood that the injection molded bracket 24 and the magnetic yoke 21 can be integrally injection molded, which is not limited here.

[0070] The sound-generating device 100 of the present invention can be used in a variety of application environments when it is actually used. In one embodiment, the first diaphragm 31 and the second diaphragm 32 can be selected to vibrate in the same direction, and the first side of the first diaphragm 31 and the second diaphragm 32 radiates the first sound wave to the external environment, and 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 in opposite phases. In this way, the first side and the second side of the sound-generating device 100 are both connected to the external environment, and the first side and the second side radiate sound waves of opposite phases to the external environment, and the sound waves on both sides cancel each other out in the far field, which is suitable for environments that require far-field noise reduction and privacy protection.

[0071] In one embodiment, the sound-emitting device 100 is applied to an electronic device and is used to separate the space of the electronic device into an acoustically isolated front cavity and a rear cavity, the first sides of the first diaphragm 31 and the second diaphragm 32 are connected to the front cavity, the second sides of the first diaphragm 31 and the second diaphragm 32 are connected to the rear cavity, the first diaphragm 31 and the second diaphragm 32 vibrate in the same direction and radiate a first sound wave to the front cavity and a second sound wave to the rear cavity, and the first sound wave and the second sound wave are in opposite phases.

[0072] It can be understood that electronic devices usually have a sound outlet hole for the front cavity sound waves to radiate and a rear leakage hole connected to the rear cavity. When using the electronic device, the front cavity sound waves can be radiated through the sound outlet hole and received by the user. Furthermore, the rear cavity sound waves can be radiated through the rear leakage hole. In this way, the front and rear cavity sound waves can realize acoustic dipoles to achieve the technical effect of reducing sound leakage. Alternatively, the rear cavity sound waves may not radiate outward, and the sound-emitting device 100 of the present invention only serves to superimpose and enhance the sound waves on the first side of the first diaphragm 31 and the second diaphragm 32, thereby improving the effect of high-frequency performance. Choose to use according to actual conditions.

[0073] In one embodiment, the second diaphragm 32 is an annular diaphragm, and the inner edge of the second diaphragm 32 forms a third through hole 324 . The sound-generating device 100 further includes a first air permeable member 61 , which is connected to the inner edge of the first diaphragm 31 and covers the third through hole 324 .

[0074] In this embodiment, if Figures 2 to 4 As shown, the second diaphragm 32 may be an annular diaphragm, and the inner edge of the second diaphragm 32 forms a third through hole 324, that is, the inner edge of the second diaphragm 32 forms a third through hole 324. It can be understood that by providing the first air permeable member 61, the first air permeable member 61 is connected to the inner edge of the second diaphragm 32 and covers the third through hole 324, so that the first air permeable member 61 is used to prevent external dust or impurities from entering the interior of the sound-generating device 100, thereby avoiding affecting the acoustic performance of the sound-generating device 100.

[0075] In one embodiment, a first cavity 13 is formed between the second diaphragm 32 , the housing 1 , the magnetic yoke 21 and the injection molded bracket 24 . The sound-generating device 100 is provided with a first leakage hole 121 connecting the first cavity 13 with the outside. The sound-generating device 100 also includes a second air permeable member 62 covering the first leakage hole 121 .

[0076] In this embodiment, if Figure 2As shown, the second diaphragm 32 of the vibration system 3, the housing 1, the magnetic yoke 21 and the injection molded bracket 24 enclose a first cavity 13, and the first cavity 13 can be selected as a sealed cavity. In order to balance the air pressure in the first cavity 13, the vibration balance of the second diaphragm 32 is improved. It can be understood that by providing a first leakage hole 121 connecting the first cavity 13 and the outside on the sound-generating device 100, the first leakage hole 121 is used to release air, adjust the air pressure of the first cavity 13, balance the air pressure on both sides of the second diaphragm 32, and improve the vibration stability of the second diaphragm 32.

[0077] Optionally, the first leakage hole 121 includes a plurality of holes. In this embodiment, the plurality of first leakage holes 121 are symmetrically arranged along the circumference of the sound-generating device 100. In this way, the air pressure of the first cavity 13 is balanced by the first leakage holes 121, thereby improving the vibration balance of the second diaphragm 32.

[0078] In this embodiment, by arranging the second air permeable member 62 on the first leakage hole 121 and covering the first leakage hole 121 with the second air permeable member 62, on the one hand, external dust or impurities can be prevented from entering the interior of the sound-emitting device 100, thereby avoiding affecting the acoustic performance of the sound-emitting device 100; on the other hand, the air flow rate of the first cavity 13 can be further adjusted, the air pressure of the first cavity 13 can be adjusted, the air pressure on both sides of the second diaphragm 32 can be balanced, and the vibration stability of the second diaphragm 32 can be improved.

[0079] Optionally, a first leakage hole 121 is provided between the first shell 11 and the second shell 12 of the outer shell 1, and a second air permeable member 62 is provided at the first leakage hole 121, so as to further adjust the air flow velocity in the cavity of the sound-emitting device 100 and adjust the sound resistance, thereby improving the performance of the sound-emitting device 100.

[0080] In one embodiment, the magnetic yoke 21 includes 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 outer shell 1 at one end away from the first side plate 213, and the inner periphery of the first top plate 211 is integrally injection molded with the injection molding bracket 24; the central magnetic portion 22 is arranged on the side of the first top plate 211 and the injection molding bracket 24 close to the first bottom plate 212, and is spaced from the first side plate 213 to enclose a first magnetic gap 25, and the edge magnetic portion 23 is arranged on the side of the first bottom plate 212 close to the first top plate 211, and is spaced from the first side plate 213 to enclose a second magnetic gap 26.

[0081] In this embodiment, if Figures 2 to 8As shown, the magnetic yoke 21 can be optionally an integrally formed structure, that is, the magnetic yoke 21 is integrally stretched to form a first bottom plate 212, a first side plate 213 and a first top plate 211 which are sequentially connected. Such a design can reduce the structural complexity of the magnetic yoke 21 and reduce the difficulty of forming the magnetic yoke 21. The first side plate 213 of the magnetic yoke 21 can be optionally 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 are enclosed to form a receiving cavity, and the first bottom plate 212 is located on the side of the first side plate 213 facing away from the receiving cavity. It can be understood that the central magnetic portion 22 is located in the receiving cavity of the magnetic yoke 21, and the side magnetic portion 23 is located outside the receiving cavity of the magnetic yoke 21, that is, the side magnetic portion 23 and the central magnetic portion 22 are located on opposite sides of the first side plate 213.

[0082] 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 yoke 21 are distributed up and down 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 as to ensure that the size of the magnetic circuit system 2 along the vibration direction of the vibration system 3 is not too large, thereby achieving a light and thin design.

[0083] In this embodiment, the first top plate 211 of the magnetic yoke 21 is annular, and a through hole structure is formed in the center of the first top plate 211. The inner periphery of the first top plate 211 is integrally formed with the injection molding bracket 24, so that the first top plate 211 of the magnetic yoke 21 and the injection molding bracket 24 cooperate to install and fix the central magnetic part 22, and the inner periphery of the second diaphragm 32 is fixed by using the side of the injection molding bracket 24 facing away from the central magnetic part 22.

[0084] Optionally, the side of the injection-molded bracket 24 facing the central magnetic portion 22 is flush with the side of the first top plate 211 facing the central magnetic portion 22, so that the injection-molded bracket 24 and the first top plate 211 can cooperate to effectively increase the bonding area with the central magnet 221 of the central magnetic portion 22, thereby improving the connection stability and reducing the reliability risk.

[0085] Optionally, the side of the injection-molded bracket 24 facing away from the central magnetic portion 22 protrudes from the side of the first top plate 211 facing away from the central magnetic portion 22, and is connected to the inner periphery of the second diaphragm 32, so that the injection-molded bracket 24 can be used to fix the second diaphragm 32 and improve the sealing of the first cavity 13. Moreover, since the injection-molded bracket 24 is an injection-molded part, the width of the inner periphery of the second diaphragm 32 on the injection-molded bracket 24 can be selected and designed according to actual use requirements, thereby increasing the bonding area of ​​the second diaphragm 32 and improving the bonding strength of the second diaphragm 32.

[0086] In order to further improve the structural strength and connection stability of the magnetic yoke 21 and the injection molded bracket 24, in one embodiment, as shown in FIG. Figure 2 , Figure 6 As shown, the injection-molded bracket 24 is provided with a first embedding groove 242 , and the inner periphery of the first top plate 211 is provided with a first embedding portion 2111 , and the first embedding portion 2111 is embedded in the first embedding groove 242 , which is not limited here.

[0087] In this embodiment, the central magnetic portion 22 is disposed in the accommodating cavity, and is connected to the first top plate 211 and the injection molding bracket 24, and is spaced from the first side plate 213 to enclose a first magnetic gap 25. The first bottom plate 212 is optionally connected to an end of the first side plate 213 away from the first top plate 211, and the first bottom plate 212 extends in a direction away from the accommodating cavity, and is arranged at an angle with the first side plate 213. The edge magnetic portion 23 is disposed on the first bottom plate 212, and is spaced from the first side plate 213 to enclose a second magnetic gap 26, that is, the edge magnetic portion 23 and the central magnetic portion 22 are located on opposite sides of the first side plate 213.

[0088] It can be understood that the second through hole 223, the first through hole 241 and the third through hole 324 are coaxially arranged along the vibration direction of the vibration system 3, so that the second through hole 223, the first through hole 241 and the third through hole 324 are connected in sequence to form a through hole 4. The opening area of ​​the through hole 4 is too small, which is not conducive to the radiation of the sound waves of the first diaphragm 31 to the outside; the opening area of ​​the through hole 4 is too large, so that the bonding area between the central magnetic part 22 and the first top plate 211 and the injection molded bracket 24 is too small, which is not conducive to improving the connection reliability between the two.

[0089] It should be noted that the through hole 4 may be one or more, and when there is one through hole 4, the opening area of ​​the through hole 4 is the opening area of ​​one through hole 4. When there are multiple through holes 4, the opening area of ​​the through hole 4 is the sum of the opening areas of the multiple through holes 4, which is not limited here.

[0090] In this embodiment, the projection area of ​​the first top plate 211 is defined as S1, and the opening area of ​​the through hole 4 is defined as S2, S2 = (10% to 80%) S1. In this embodiment, by controlling the opening area of ​​the through hole 4, it is not only beneficial for the sound waves of the first diaphragm 31 to radiate to the outside, but also can ensure the structural strength of the magnetic yoke 21 and the connection area between the central magnetic part 22 and the first top plate 211 and the injection molding bracket 24, thereby improving stability.

[0091] Optionally, the opening area S2 of the through hole 4 accounts for 10% to 80% of the projection area S1 of the first top plate 211. Specifically, it can be 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, etc., which is not limited here.

[0092] In one embodiment, the central magnetic portion 22 includes a stacked central magnet 221 and a central magnetic conductive plate 222 , the central magnet 221 is connected to the first top plate 211 and the injection molded bracket 24 , and the second through hole 223 passes through the central magnetic conductive plate 222 and the central magnet 221 in sequence.

[0093] In this embodiment, if Figure 2 As shown, the center magnet 221 is connected to the first top plate 211 of the magnetic yoke 21 and the injection molded bracket 24, that is, the center magnet 221 is sandwiched between the first top plate 211 and the center magnetic plate 222, and the outer peripheries of the center magnet 221 and the center magnetic plate 222 are spaced from the first side plate 213 of the magnetic yoke 21 to form a first magnetic gap 25.

[0094] It can be understood that the central magnetic plate 222 of the central magnetic part 22 is provided with a first through hole, and the central magnet 221 is provided with a second through hole, so that the first through hole and the second through hole are connected in sequence to form a second through hole 223. Optionally, the first through hole and the second through hole are coaxially arranged along the vibration direction of the vibration system 3.

[0095] Optionally, the central magnet 221 and the central magnetic conductive plate 222 of the central magnetic portion 22 may be circular plate-shaped or disc-shaped structures, which are not limited here.

[0096] In one embodiment, the first bottom plate 212 is provided with an avoidance groove 2121 corresponding to the second magnetic gap 26, and the avoidance groove 2121 is recessed and extends in a direction away from the second voice coil 34. In this way, the avoidance groove 2121 can be used to provide an avoidance space for the second voice coil 34, and the vibration space of the second voice coil 34 can be increased, so that the acoustic performance of the sound-generating device 100 can be improved.

[0097] In this embodiment, if Figures 2 to 4 As shown, the edge magnet part 23 includes a stacked edge magnet 231 and an edge magnetic conductive plate 232, and the edge magnet 231 is connected to the magnetic yoke 21. It can be understood that the edge magnet 231 is connected to the first bottom plate 212 of the magnetic yoke 21, that is, the edge magnet 231 is sandwiched between the first bottom plate 212 and the edge magnetic conductive plate 232, and the inner periphery of the edge magnet 231 and the edge magnetic conductive plate 232 are spaced from the first side plate 213 of the magnetic yoke 21 to form a second magnetic gap 26. Optionally, the edge magnet 231 and the edge magnetic conductive plate 232 of the edge magnet part 23 can be selected as a circular ring structure, which is not limited here.

[0098] In order to further improve the connection stability, in this embodiment, the side magnetic conductive plate 232 and the housing 1 are an integrally formed structure. It is understandable that the housing 1 can be made of metal or plastic. When the housing 1 is made of metal, the housing 1 and the side magnetic conductive plate 232 are integrally formed, which can simplify the processing steps and improve the heat dissipation effect. When the housing 1 is made of plastic, the housing 1 and the side magnetic conductive plate 232 can be integrally injection molded, which is not limited here.

[0099] Optionally, the side magnetic conductive plate 232 and the second shell 12 of the outer shell 1 are an integrally formed structure, which is not limited here. In the present embodiment, the side magnetic conductive plate 232 is injection molded on the outer shell 1, and the first leakage hole 121 is formed by removing material from the side magnetic conductive plate 232 and / or the corresponding area of ​​the outer shell 1. It can be understood that by removing material from the side magnetic conductive plate 232 or the outer shell 1 or from both the side magnetic conductive plate 232 and the outer shell 1 to form the first leakage hole 121, the first leakage hole 121 does not occupy the radial dimension of the sound-emitting device 100 additionally, or the size of the first leakage hole 121 can be increased within the limited size of the sound-emitting device 100 to balance the internal pressure.

[0100] In one embodiment, the first housing 11 may be a plastic housing. Figure 2 , Figure 3 , Figure 5 , Figure 6 As shown, the outer periphery of the magnetic yoke 21 is integrally molded with the first housing 11. It can be understood that the outer periphery of the first bottom plate 212 of the magnetic yoke 21 is integrally molded with the first housing 11, which can improve the connection stability between the magnetic yoke 21 and the housing 1.

[0101] Optionally, the first housing 11 is provided with a second embedding groove 111 , and the outer periphery of the magnetic yoke 21 is provided with a second embedding portion 2122 , and the second embedding portion 2122 is embedded in the second embedding groove 111 .

[0102] Of course, in other embodiments, the magnetic yoke 21 and the first housing 11 may also be connected by bonding. Figure 4 and Figure 7 As shown, a support platform 112 is protrudingly provided on the inner wall of the first shell 11 , and the outer periphery of the magnetic yoke 21 is supported on the support platform 112 and bonded to the support platform 112 , which is not limited here.

[0103] In one embodiment, the second diaphragm 32 includes an inner fold ring 321, a vibration part 322 and an outer fold ring 323 connected in sequence. The inner side of the inner fold ring 321 is provided with a third through hole 324 and is connected to the injection molded bracket 24. The outer side of the outer fold ring 323 is connected to the outer shell 1, and the second voice coil 34 is connected to the vibration part 322.

[0104] In this embodiment, if Figures 2 to 4As shown, by setting the second diaphragm 32 as a double fold ring structure, the second diaphragm 32 is conveniently connected to the outer shell 1 through the outer side of the outer fold ring 323, and connected to the injection molded bracket 24 through the inner side of the inner fold ring 321, so as to achieve the sealing of the first cavity 13 and ensure that the second diaphragm 32 is driven to vibrate when the second voice coil 34 vibrates.

[0105] It is understandable that the inner side of the inner fold ring 321 of the second diaphragm 32 can be a ring structure or a flat plate structure. When the inner side of the inner fold ring 321 is a ring structure, the inner side of the inner fold ring 321 forms a third through hole 324; when the inner side of the inner fold ring 321 is a flat plate structure, the flat plate structure is provided with a third through hole 324, which is not limited here.

[0106] In this embodiment, the inner fold ring 321 and the outer fold ring 323 of the second diaphragm 32 are convex structures protruding upward or concave structures concave downward, which are not limited here. It can be understood that the inner fold ring 321 of the second diaphragm 32 protrudes in a direction away from the injection molding bracket 24, so as to avoid interference from the injection molding bracket 24 when the second diaphragm 32 vibrates. Optionally, the inner fold ring 321 and the outer fold ring 323 of the second diaphragm 32 both protrude in a direction away from the magnetic circuit system 2.

[0107] Optionally, the inner fold ring 321 , the vibrating portion 322 and the outer fold ring 323 of the second diaphragm 32 are an integrally formed structure, which can simplify the processing steps of the second diaphragm 32 and improve the structural strength of the second diaphragm 32 .

[0108] In one embodiment, if Figure 2 As shown, the second diaphragm 32 further includes a vibration plate 325, and the vibration plate 325 is disposed between the vibration portion 322 and the second voice coil 34. It can be understood that by providing the vibration plate 325, the structural strength of the second diaphragm 32 is enhanced, the acoustic performance of the second diaphragm 32 is improved, and the second diaphragm 32 is prevented from being torn when the second voice coil 34 vibrates.

[0109] In one embodiment, the first diaphragm 31 includes a folded ring portion 311 and a dome 312 . The folded ring portion 311 is disposed around the dome 312 . The outer edge of the folded ring portion 311 is connected to the housing 1 . The first voice coil 33 is connected to the dome 312 .

[0110] In this embodiment, if Figures 2 to 4 As shown, the folding ring portion 311 and the dome 312 of the first diaphragm 31 can be an integrally formed structure or a separate structure, which is not limited here. It can be understood that the folding ring portion 311 of the first diaphragm 31 is a convex structure protruding upward or a concave structure concave downward, which is not limited here. Optionally, the folding ring portion 311 protrudes in a direction away from the magnetic circuit system 2.

[0111] It can be understood that the outer edge of the folded ring portion 311 is connected to the outer shell 1, and the first voice coil 33 is connected to the dome 312, so that when the first voice coil 33 vibrates, it drives the first diaphragm 31 to vibrate, so that the sound waves of the first diaphragm 31 radiate outward along the second through hole 223, the first through hole 241 and the third through hole 324.

[0112] In one embodiment, the second through hole 223, the first through hole 241 and the third through hole 324 are connected in sequence to form a through hole 4, the outer contour of the spherical top 312 is circular, the through hole 4 is a circular hole, the diameter of the spherical top 312 is defined as D1, the diameter of the through hole 4 is defined as D2, and D2≥0.3D1.

[0113] It can be understood that the diameter of the dome 312 and the diameter of the through hole 4 directly affect the transmission of the sound waves of the first diaphragm 31. Through the above-mentioned diameter design method, it is possible to ensure that the sound waves of the first diaphragm 31 are smoothly transmitted and reduce airflow sound.

[0114] In order to achieve smooth transmission of sound waves from the first diaphragm 31 , in another embodiment, the projection area of ​​the through hole 4 along the vibration direction of the vibration system 3 is defined as S1, and the projection area of ​​the dome 312 along the vibration direction of the vibration system 3 is defined as S2, S1 ≥ 8.5% * S2.

[0115] It is understandable that the above-mentioned design of the projection area can ensure that the sound waves of the first diaphragm 31 are smoothly transmitted and reduce the airflow sound. In practical applications, a suitable structural design is selected according to specific needs to ensure that the sound waves of the first diaphragm 31 are smoothly transmitted and the airflow sound is reduced, which is not limited here.

[0116] In one embodiment, if Figures 2 to 4 As shown, the sound-generating device 100 further includes a first support ring 51, which is disposed between the outer periphery of the first diaphragm 31 and the housing 1. Optionally, the first support ring 51 may be a steel ring, and the first support ring 51 is used between the outer periphery of the folding ring portion 311 of the first diaphragm 31 and the housing 1, so that the first diaphragm 31 is easy to take during the assembly process, and at the same time, the assembly accuracy is improved, thereby improving the performance of the sound-generating device 100.

[0117] In one embodiment, if Figures 2 to 4 As shown, the sound-generating device 100 further includes a second support ring 52, which is disposed between the outer periphery of the second diaphragm 32 and the housing 1. Optionally, the second support ring 52 may be a steel ring, and the second support ring 52 is used between the outer periphery of the outer folding ring 323 of the second diaphragm 32 and the housing 1, so that the second diaphragm 32 is easy to take during the assembly process, and at the same time, the assembly accuracy is improved, thereby improving the performance of the sound-generating device 100.

[0118] In one embodiment, the sound-generating device 100 further includes a front cover 7 , which is located on a 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 , and the front cover 7 is provided with a fourth through hole 72 connecting the second cavity 71 and the outside.

[0119] In this embodiment, if Figures 1 to 4 As shown, by providing the front cover 7, on the one hand, the front cover 7 is used to protect the first diaphragm 31, and on the other hand, a 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 providing the fourth through hole 72 in the front cover 7, the sound waves on the second side of the first diaphragm 31 are conveniently radiated outward through the fourth through hole 72.

[0120] Optionally, the front cover 7 is a metal part formed by processing a metal material, which is convenient for effectively supporting the sound-emitting device 100 during the assembly process of the sound-emitting device 100 and also reduces the size of the whole device. In specific applications, a suitable number of fourth through holes 72 is set according to actual conditions, and is not limited to a fixed number. Preferably, a damping member or a breathable membrane is provided 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.

[0121] In this embodiment, the sound-generating device 100 of the present invention achieves sound by providing a dual diaphragm and dual voice coil structure, and utilizing a magnetic circuit system 2 to drive the two diaphragms of the two voice coils to vibrate. At the same time, double-sided diaphragm sound generation is achieved without increasing the external dimensions, thereby increasing the vibration area of ​​the vibration system 3, thereby achieving the purpose of performance improvement. In addition, the double-sided diaphragms radiate sound waves on the same side of the sound-generating device 100, which is beneficial to improving the loudness and sensitivity of the sound-generating device 100. The magnetic yoke 21 is set as a positive and negative stretching structure, and an integrally injected injection molded bracket 24 is set on the inner edge of the magnetic yoke 21, so that the injection molded bracket 24 is used to fix the inner edge of the second diaphragm 32, and the magnetic yoke 21 and the injection molded bracket 24 are used to fix the central magnetic part 22 of the magnetic circuit system 2, thereby increasing the bonding area of ​​the central magnet 221, improving stability while reducing reliability risks, and by using the second through hole 223 of the central magnetic part 22, the first through hole 241 of the injection molded bracket 24 and the third through hole 324 of the second diaphragm 32 to connect in sequence to form an air flow channel, effectively increasing the air flow area when the first diaphragm 31 vibrates, thereby ensuring smoother air flow, improving the high-frequency performance of the first diaphragm 31, and thus improving the high-frequency performance after the first diaphragm 31 and the second diaphragm 32 are superimposed.

[0122] The present invention further provides an electronic device, which includes the above-mentioned sound-generating device 100. The specific structure of the sound-generating device 100 refers to the above-mentioned embodiment. Since the electronic device adopts all the technical solutions of all the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0123] In one embodiment, the electronic device further includes a device housing, the device housing is provided with a receiving cavity, the sound-emitting device 100 is disposed in the receiving cavity, and the receiving cavity is divided into a front cavity and a rear cavity isolated from each other, and the first side of the first diaphragm 31 and the second diaphragm 32 is connected to the front cavity; wherein the device housing is provided with a sound outlet hole connected to the front cavity, and the sound waves of the first sides of the first diaphragm 31 and the second diaphragm 32 of the sound-emitting device 100 are radiated to the outside through the front cavity and the sound outlet hole.

[0124] In this embodiment, the device housing may be a metal housing or a plastic housing, which is not limited here. The device housing may be an integrally formed structure or a split structure, which is not limited here. Optionally, the device housing includes an upper housing and a lower housing, and the upper housing and the lower housing may be bonded or welded to enclose and form a receiving cavity.

[0125] Optionally, the outer contour of the device housing may be a square structure. In specific applications, other suitable shapes such as a circle may be selected according to actual conditions, and the device housing is not limited to a specific shape.

[0126] It can be understood that a sound outlet hole connected to the front cavity is provided on the upper shell of the device housing, so that the sound waves on the first side of the first diaphragm 31 and the second diaphragm 32 of the sound-emitting device 100 are radiated to the outside through the front cavity and the sound outlet hole.

[0127] In this embodiment, the first cavity 13 of the sound-generating device 100 is connected to the rear cavity through the first leakage hole 121, and the second side of the first diaphragm 31 is connected to the rear cavity. In one embodiment, the device housing is further provided with a second leakage hole, which is connected to the rear cavity.

[0128] In one embodiment, the device housing is further provided with a second leakage hole, the second leakage hole is connected to the rear cavity, and the second side of the first diaphragm 31 is connected to the rear cavity. It can be understood that the lower shell of the device housing is provided with a second leakage hole, the second leakage hole is connected to the rear cavity, the first diaphragm 31 and the second diaphragm 32 radiate sound waves with opposite phases to the sound waves of the front cavity to the rear cavity, and the sound waves of the rear cavity are radiated to the outside through the second leakage hole. Optionally, a damping member for adjusting the acoustic resistance is provided on the second leakage hole.

[0129] In this embodiment, a second leakage hole is provided on the lower shell of the device housing, and the second leakage hole is connected to the rear cavity, which is used to adjust the pressure in the rear cavity and further adjust the air pressure of the first cavity 13. At the same time, the sound waves of the rear cavity are radiated to the outside through the second leakage hole, and the sound waves of the rear cavity are opposite in phase to the sound waves of the front cavity, which can play the role of an acoustic dipole, achieving the technical effect of far-field silencing and protecting user privacy.

[0130] In this embodiment, the second leakage hole may be a circular hole, an elliptical hole or a polygonal hole, etc., which is not limited here. The number of the second leakage hole may be one or more, which is specifically designed according to the actual application, which is not limited here.

[0131] In this 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 together form the side wall of the electronic device housing, that is, the device housing includes a top wall and a bottom wall that are relatively arranged and a side wall connecting the top wall and the bottom wall. Optionally, the sound outlet hole is provided in the top wall or the connecting area of ​​the side wall and the top wall, and the second leakage hole is provided in the side wall or the bottom wall or the connecting area of ​​the side wall and the bottom wall. In this way, the sound performance of the electronic device and the technical effect of protecting privacy can be taken into account. When using, the most suitable design scheme can be selected according to actual needs, and the present invention is not limited here.

[0132] The above descriptions are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A sound-generating device, characterized in that: The sound-generating device comprises: shell; A magnetic circuit system, wherein the magnetic circuit system comprises a central magnetic portion, a side magnetic portion, a magnetic yoke and an injection molded bracket, wherein the inner edge of the magnetic yoke is integrally injection molded with the injection molded bracket, wherein the injection molded bracket is provided with a first through hole, wherein the central magnetic portion is connected to the magnetic yoke and the injection molded bracket, and a first magnetic gap is formed between the central magnetic portion and the magnetic yoke, wherein the central magnetic portion is provided with a second through hole corresponding to and communicating with the first through hole, wherein the side magnetic portion is connected to the magnetic yoke, and a second magnetic gap is formed between the side magnetic portion and the magnetic yoke, and wherein the second magnetic gap is arranged around the first magnetic gap; and A vibration system, the vibration system comprising a first diaphragm, a second diaphragm, a first voice coil and a second voice coil, the first diaphragm and the second diaphragm are located on opposite sides of the magnetic circuit system, the outer periphery of the first diaphragm is connected to the housing, and is opposite to and spaced from the magnetic circuit system, the outer periphery of the second diaphragm is connected to the housing, the inner periphery of the second diaphragm is connected to the injection molded bracket, and the inner periphery of the second diaphragm is provided with a third through hole connected to the first through hole, one end of the first voice coil is connected to the first diaphragm, and the other end of the first voice coil is suspended in the first magnetic gap, one end of the second voice coil is connected to the second diaphragm, and the other end of the second voice coil is suspended in the second magnetic gap.

2. The sound-generating device according to claim 1, characterized in that: 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, an end of the first bottom plate away from the first side plate is connected to the housing, and an inner periphery of the first top plate is integrally injection molded with the injection molded bracket; The central magnetic portion is arranged on the side of the first top plate and the injection molded bracket close to the first bottom plate, and is spaced from the first side plate to enclose the first magnetic gap. The edge magnetic portion is arranged on the side of the first bottom plate close to the first top plate, and is spaced from the first side plate to enclose the second magnetic gap.

3. The sound-generating device according to claim 2, characterized in that: The injection-molded bracket is provided with a first embedding groove, the inner periphery of the first top plate is provided with a first embedding portion, and the first embedding portion is embedded in the first embedding groove; And / or, a side of the injection-molded bracket facing the central magnetic part is flush with a side of the first top plate facing the central magnetic part; And / or, a side of the injection-molded bracket facing away from the central magnetic portion protrudes out of a side of the first top plate facing away from the central magnetic portion, and is connected to an inner periphery of the second diaphragm; And / or, the first bottom plate is provided with an avoidance groove corresponding to the second magnetic gap, and the avoidance groove is recessed and extends in a direction away from the second voice coil; And / or, the first top plate and the first bottom plate are connected to two ends of the first side plate along the vibration direction of the vibration system; And / or, the magnetic yoke is integrally stretched to form the first bottom plate, the first side plate and the first top plate which are connected in sequence; And / or, the central magnetic part includes a central magnet and a central magnetic conductive plate which are stacked, the central magnet is connected to the first top plate and the injection molded bracket, and the second through hole passes through the central magnetic conductive plate and the central magnet in sequence.

4. The sound generating device according to claim 1, characterized in that: The outer shell includes a first shell and a second shell connected to each other. One end of the first shell away from the second shell is connected to the outer side of the first diaphragm, the side of the second shell facing away from the first shell is connected to the outer periphery of the second diaphragm, and the outer periphery of the magnetic yoke is connected to the first shell.

5. The sound generating device according to claim 4, characterized in that: The first shell is a plastic shell; The outer periphery of the magnetic yoke is integrally injection molded with the first shell; wherein the first shell is provided with a second embedding groove, the outer periphery of the magnetic yoke is provided with a second embedding portion, and the second embedding portion is embedded in the second embedding groove; or, a support platform is convexly provided on the inner wall of the first shell, and the outer periphery of the magnetic yoke is supported on the support platform and bonded to the support platform; And / or, the side magnetic part includes a stacked side magnet and a side magnetic conductive plate, the side magnet is connected to the magnetic conductive yoke, and the side magnetic conductive plate and the second shell are an integrally formed structure.

6. The sound generating device according to claim 1, characterized in that: The first diaphragm includes a folded ring portion and a dome, the folded ring portion is arranged around the dome, the outer edge of the folded ring portion is connected to the housing, the first voice coil is connected to the dome, and the second through hole, the first through hole and the third through hole are connected in sequence to form a through hole; Among them, the outer contour of the spherical top is circular, the through hole is a circular hole, the diameter of the spherical top 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 S1, and the projection area of ​​the spherical top along the vibration direction of the vibration system is defined as S2, and S1≥8.5%*S2.

7. The sound generating device according to claim 1, characterized in that: The second diaphragm comprises an inner fold ring, a vibration part and an outer fold ring which are connected in sequence, the inner side of the inner fold ring is provided with the third through hole and is connected to the injection molding bracket, the outer side of the outer fold ring is connected to the housing, and the second voice coil is connected to the vibration part; Wherein, the second diaphragm further includes a vibration plate, and the vibration plate is arranged between the vibration part and the second voice coil.

8. The sound generating device according to claim 1, characterized in that: The first diaphragm and the second diaphragm vibrate in the same direction and radiate sound waves with the same phase outward; And / or, the second diaphragm is an annular diaphragm, the inner edge of the second diaphragm forms the third through hole, and the sound-generating device further comprises a first air-permeable member, the first air-permeable member is connected to the inner edge of the first diaphragm and covers the third through hole; And / or, a first cavity is formed between the second diaphragm, the housing, the magnetic yoke and the injection molded bracket, the sound-emitting device is provided with a first leakage hole connecting the first cavity with the outside, and the sound-emitting device also includes a second air-permeable member covering the first leakage hole.

9. The sound generating device according to any one of claims 1 to 8, characterized in that: The sound-generating device further comprises a first supporting ring, wherein the first supporting ring is arranged between the outer periphery of the first diaphragm and the housing; And / or, the sound-generating device further comprises a second supporting ring, wherein the second supporting ring is arranged between the outer periphery of the second diaphragm and the housing; And / or, the sound-generating device further includes a front cover, the front cover is located on a side of the first diaphragm away from the second diaphragm, a second cavity is formed between the first diaphragm and the front cover, and the front cover is provided with a fourth through hole connecting the second cavity and the outside.

10. An electronic device, characterized in that: The electronic device comprises: A device housing, wherein the device housing is provided with a receiving cavity; and The sound-generating device according to any one of claims 1 to 9, wherein the sound-generating device is disposed in the receiving cavity and divides the receiving cavity into a front cavity and a rear cavity that are isolated from each other; The device housing is provided with a sound outlet hole connected to the front cavity, and the sound waves of the first diaphragm and the second diaphragm of the sound-generating device are radiated to the outside through the sound outlet hole.

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