Sound production apparatus and terminal device

Abstract

Disclosed in the present invention are a sound production apparatus and a terminal device. The sound production apparatus comprises a housing, a vibration system, and a magnetic circuit system; in the vibration system, a first vibration assembly comprises a first diaphragm assembly and a first voice coil connected to the first diaphragm assembly, and a second vibration assembly comprises a second diaphragm assembly and a second voice coil connected to the second diaphragm assembly; the first diaphragm assembly and the second diaphragm assembly are respectively connected to two ends of the housing and cover openings, the first voice coil is a rectangular voice coil, and the second voice coil is a racetrack-shaped voice coil; the magnetic circuit system is arranged in an accommodating cavity of the housing, and the magnetic circuit system is provided with a first magnetic gap and a second magnetic gap; the second magnetic gap is arranged around the first magnetic gap, and at least part of the first magnetic gap is communicated with the second magnetic gap; and one end of the first voice coil is suspended in the first magnetic gap, and one end of the second voice coil is suspended in the second magnetic gap. The sound production apparatus of the present invention can reduce the height and weight in the Z direction, thereby reducing the housing vibration caused by the vibration system.

Description

Sounding devices and terminal equipment Technical Field

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

[0002] With the rapid development of technology, the popularity of audio devices is increasing. People's expectations for audio devices are not limited to video and audio playback, but also place greater demands on their reliability. Especially with the advent of the 5G era and the subsequent development of mobile multimedia technology, many audio devices have multiple entertainment functions, such as video playback, digital cameras, games, and GPS navigation. These requirements require the electronic components within audio devices to be increasingly sophisticated and compact.

[0003] Speakers are a common electronic component in terminal devices, primarily used for playing audio signals. In related technologies, speakers typically utilize a single-sided vibration system, and the low-frequency vibrations of single-sided speakers affect system functionality. However, double-sided speakers are more complex to secure the magnetic circuit system, and the design differences between the two voice coils are significant, resulting in insufficient compactness. This results in low utilization of the magnetic circuit system, reduced vibration driving force, and reduced speaker sensitivity. Furthermore, the speaker's height and weight in the Z direction increase, making a thin and lightweight design impossible.

[0004] Summary of the Invention

[0005] The main purpose of the present invention is to provide a sound-emitting device and a terminal device, aiming to provide a sound-emitting device that effectively improves driving force and sensitivity. The sound-emitting device not only reduces the effective diameter difference between the two voice coils, fully utilizes the space of the two voice coils, and makes it easier to match the weight, but also improves the utilization rate of the magnetic circuit system, effectively increases the driving force, effectively improves the sensitivity, and can reduce the height and weight of the sound-emitting device in the Z direction, reducing the vibration of the shell caused by the vibration system.

[0006] To achieve the above object, the present invention provides a sound-generating device, comprising:

[0007] A housing, wherein the housing is provided with a cavity with openings at both ends;

[0008] a vibration system comprising a first vibration assembly and a second vibration assembly, wherein the first vibration assembly comprises a first diaphragm assembly and a first voice coil connected to the first diaphragm assembly, and the second vibration assembly comprises a second diaphragm assembly and a second voice coil connected to the second diaphragm assembly, wherein the first diaphragm assembly and the second diaphragm assembly are respectively connected to two ends of the housing and cover the opening, wherein the first voice coil is a rectangular voice coil and the second voice coil is a racetrack-shaped voice coil; and

[0009] A magnetic circuit system is arranged between the first diaphragm assembly and the second diaphragm assembly, and the magnetic circuit system is provided with a first magnetic gap and a second magnetic gap. The second magnetic gap is arranged around the first magnetic gap, and at least a portion of the first magnetic gap is connected to the second magnetic gap. One end of the first voice coil is suspended in the first magnetic gap, and one end of the second voice coil is suspended in the second magnetic gap.

[0010] In one embodiment, the housing further comprises a mounting cavity located within the receiving cavity, and the magnetic circuit system comprises:

[0011] An external magnetic circuit portion, the external magnetic circuit portion is arranged in the installation cavity, and the external magnetic circuit portion is formed with an accommodating cavity;

[0012] a connecting member disposed in the accommodating cavity, the connecting member comprising a first connecting portion and two second connecting portions, the two second connecting portions being respectively connected to two ends of the first connecting portion and connected to the external magnetic circuit portion; and

[0013] a central magnetic circuit portion, the central magnetic circuit portion being disposed in the accommodating cavity and fixedly connected to the first connecting portion;

[0014] Among them, one end of the central magnetic circuit part and the outer sides of the two second connecting parts cooperate with one end of the outer magnetic circuit part to form the second magnetic gap, and the other end of the central magnetic circuit part and the other end of the outer magnetic circuit part and the inner sides of the two second connecting parts enclose to form the first magnetic gap.

[0015] In one embodiment, the first voice coil has two long axis segments and two short axis segments connected end to end, and the second voice coil has two long side segments and two arc segments connected end to end;

[0016] Each second connecting portion is located between a short axis segment and an arc segment to separate the first magnetic gap and the second magnetic gap. The portion of the first magnetic gap corresponding to the long axis segment is connected to the portion of the second magnetic gap corresponding to the long side segment.

[0017] In one embodiment, the first connecting portion and the two second connecting portions enclose a placement slot;

[0018] The central magnetic circuit portion includes a first washer, a first magnet, a second washer, a second magnet and a third washer arranged in a stacked manner. The first connecting portion is arranged between the second washer and the second magnet, so that the first washer, the first magnet and the second washer are located in the placement groove and are spaced from the second connecting portion to cooperate to form the first magnetic gap. The second magnet and the third washer are located outside the placement groove and cooperate with one end of the outer magnetic circuit portion to form the second magnetic gap.

[0019] In one embodiment, the second washer has a first surface facing the first magnet and a second surface facing the second magnet, the second surface is recessed to form a fixing groove, the fixing groove passes through the second washer along the direction of the long axis segment, and the first connecting portion is disposed in the fixing groove.

[0020] In one embodiment, a side of the first connecting portion facing the second magnet is flush with the second surface;

[0021] And / or, the width of the fixing groove along the direction of the minor axis segment is greater than the depth of the fixing groove along the axial direction of the second magnetic gap;

[0022] And / or, the width of the fixing groove along the direction of the minor axis segment is 2 mm to 3.5 mm;

[0023] And / or, the depth of the fixing groove along the axial direction of the second magnetic gap is 1.5 mm to 2.5 mm;

[0024] And / or, the width of the first connecting portion along the direction of the short axis segment is smaller than the width of the second connecting portion along the direction of the short axis segment;

[0025] And / or, the distance between the long axis segment and the long side segment is 0.8 mm to 1.5 mm;

[0026] And / or, the length of the long axis segment is equivalent to the length of the long side segment;

[0027] And / or, the connecting member is made of non-magnetic material.

[0028] In one embodiment, the thickness of the first magnet is greater than the thickness of the second magnet;

[0029] And / or, the ratio of the thickness of the first magnet to the thickness of the second magnet is 1:1 to 2:1;

[0030] And / or, the first magnet and the second magnet have the same magnetization direction;

[0031] And / or, the thickness of the first washer is greater than the thickness of the third washer;

[0032] And / or, the thickness of the first washer is smaller than the thickness of the second washer;

[0033] And / or, the thickness of the third washer is smaller than the thickness of the second washer;

[0034] And / or, the second washer is provided with a convex edge adjacent to the periphery of the second surface, so that the width of the first surface along the direction of the minor axis segment is smaller than the width of the second surface along the direction of the minor axis segment;

[0035] And / or, the first surface is arranged in a rectangular shape, and the outer contour of the first washer and the outer contour of the first magnet are the same as the first surface.

[0036] In one embodiment, the outer magnetic circuit portion is a U-iron, which has a cylindrical structure with both ends open to form the accommodating cavity. One end of the U-iron is bent and extended toward the accommodating cavity to form a bent portion, and the bent portion is connected to the second connecting portion. The inner sides of the bent portion and the second connecting portion are spaced from one end of the central magnetic circuit portion to enclose and form the first magnetic gap.

[0037] In one embodiment, the bent portion encloses a rectangular opening, and the end of the U iron away from the bent portion forms a runway-shaped opening;

[0038] And / or, each of the second connecting portions is provided with a positioning post, the bending portion is provided with a positioning hole corresponding to each of the positioning posts, and the positioning post is inserted into the positioning hole;

[0039] And / or, each second connecting portion has a first curved side wall, a step surface, and a second curved side wall connected in sequence on a side facing the inner wall of the accommodating cavity, the second curved side wall abuts against the inner wall of the accommodating cavity, and the first curved side wall is spaced from the inner wall of the accommodating cavity to cooperate to form the second magnetic gap;

[0040] And / or, a boss is provided on the outer wall of the U-iron, the boss extends toward a side away from the accommodating cavity, the U-iron is arranged in the installation cavity, and the boss is in limited contact with an end surface of one end of the installation cavity;

[0041] And / or, the U iron is connected to the cavity wall of the installation cavity by welding; or, the U iron is connected to the cavity wall of the installation cavity by adhesive bonding.

[0042] In one embodiment, the first diaphragm assembly and the second diaphragm assembly each include a cone and a diaphragm arranged around the cone, the periphery of the diaphragm is connected to the shell, and one end of the first voice coil or the second voice coil is connected to the cone.

[0043] In one embodiment, the first vibration component and the second vibration component further include a bracket and a centering support plate, the bracket is connected to the cone and surrounds the first voice coil or the second voice coil, one end of the centering support plate is connected to the bracket, and the other end of the centering support plate is connected to the shell.

[0044] In one embodiment, the housing comprises:

[0045] A shell, the shell being a cylindrical structure with two ends open, and the shell having the cavity;

[0046] An installation portion, the installation portion being provided with an installation cavity and being located in the receiving cavity; and

[0047] The fixing portion is disposed in the cavity and connects the housing and the mounting portion.

[0048] In one embodiment, the centering support piece is a spring-loaded structure;

[0049] And / or, the two centering supports are located on opposite sides of the fixing portion and are symmetrically arranged relative to the fixing portion;

[0050] And / or, the two brackets are located on opposite sides of the fixing portion and are symmetrically arranged relative to the fixing portion;

[0051] And / or, the two diaphragms are located on opposite sides of the fixing portion and are symmetrically arranged relative to the fixing portion;

[0052] And / or, each of the diaphragms includes an inner fixing portion, a folding ring portion, and an outer fixing portion connected in sequence, the inner fixing portion is connected to the cone, and the outer fixing portion is connected to the housing;

[0053] And / or, the distance between the bracket and the mounting portion is 1 mm to 2 mm;

[0054] And / or, the skeletons of the first voice coil and the second voice coil are provided with a first through hole, the bracket is provided with a second through hole, and the fixing portion is provided with a third through hole;

[0055] And / or, two support platforms are provided on the inner wall of the shell, and the two support platforms are provided on opposite sides of the fixing portion, and the periphery of each centering support piece is connected to one of the support platforms.

[0056] The present invention further provides a terminal device, comprising a device body and the above-mentioned sound-generating device, wherein the sound-generating device is connected to the device body.

[0057] The sound-generating device of the technical solution of the present invention is convenient for installing, fixing and supporting the vibration system and the magnetic circuit system by setting the shell as a cavity structure with openings at both ends. By setting the vibration system as a first vibration component and a second vibration component, the first diaphragm component of the first vibration component and the second diaphragm component of the second vibration component are respectively connected to the two ends of the shell, and the openings are covered to form a vibration space between the first diaphragm component and the second diaphragm component, and the sound-generating device has a double-sided sound-generating function; at the same time, the first voice coil is set as a rectangular voice coil, and the second voice coil is set as a runway-shaped voice coil. By setting the magnetic circuit system between the first diaphragm component and the second diaphragm component The vibration space between the components is provided, and a first magnetic gap and a second magnetic gap are provided in the magnetic circuit system, so that the second magnetic gap is arranged around the first magnetic gap, and at least a part of the first magnetic gap is connected with the second magnetic gap. In this way, one end of the first voice coil can be suspended in the first magnetic gap, and one end of the second voice coil can be suspended in the second magnetic gap, thereby cleverly making full use of the space of the runway-shaped voice coil and the rectangular voice coil, reducing the effective diameter difference between the two voice coils, making it easier to match the weight, and also improving the utilization rate of the magnetic circuit system, effectively increasing the driving force, effectively improving the sensitivity, and reducing the height and weight of the sound-emitting device in the Z direction, reducing the vibration of the shell caused by the vibration system. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 any creative work.

[0059] FIG1 is a schematic structural diagram of a sound-generating device according to an embodiment of the present invention;

[0060] FIG2 is a schematic cross-sectional view of a sound-generating device along the long axis in one embodiment of the present invention;

[0061] FIG3 is a schematic cross-sectional view of a sound-generating device along the minor axis in one embodiment of the present invention;

[0062] FIG4 is an exploded schematic diagram of a sound-generating device without a housing according to an embodiment of the present invention;

[0063] FIG5 is a schematic top view of the structure of the first voice coil and the second voice coil in cooperation with each other in one embodiment of the present invention;

[0064] FIG6 is an exploded schematic diagram of a connector and an external magnetic circuit according to an embodiment of the present invention;

[0065] FIG7 is a schematic structural diagram of the connection member and the second washer in accordance with an embodiment of the present invention;

[0066] FIG8 is a schematic structural diagram of a second washer in one embodiment of the present invention.

[0067] Description of Figure Numbers:

[0068] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0069] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0070] 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 various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0071] 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 an option in which both A and B are satisfied.

[0072] In addition, in the present invention, descriptions such as "first" and "second" are for descriptive purposes only and should not 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 such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0073] With the rapid development of technology, the popularity of audio devices is increasing. People's expectations for audio devices are not limited to video and audio playback, but also place greater demands on their reliability. Especially with the advent of the 5G era and the subsequent development of mobile multimedia technology, many audio devices have multiple entertainment functions, such as video playback, digital cameras, games, and GPS navigation. These requirements require the electronic components within audio devices to be increasingly sophisticated and compact.

[0074] In terminal devices, speakers are a commonly used electronic component, primarily used for playing audio signals. In related technologies, speakers are generally composed of a single-sided vibration system, and the low-frequency vibration of a single-sided speaker affects the system's functionality. The simple magnetic circuit and voice coil design in a double-sided speaker cannot reduce the overall height of the speaker because the magnetic circuit and voice coil designs are not compact enough. Furthermore, the design differences between the dual voice coils are too large and not compact enough, making it difficult to match the vibration mass and affecting the BL value. Complex magnetic circuit and voice coil designs lack stability in the central magnetic circuit and lack stable structural support with the external magnetic circuit, making it easy for the central magnetic circuit to adsorb with the external magnetic circuit. Furthermore, because the fixing of the magnetic circuit system is complex and the design differences between the dual voice coils are too large and not compact enough, the utilization rate of the magnetic circuit system is low, reducing the vibration driving force and affecting the sensitivity of the speaker. Furthermore, the height and weight of the speaker in the Z direction are increased, making it impossible to achieve a lightweight design for the speaker.

[0075] Based on the above concepts and problems, the present invention proposes a sound-generating device 100. It is understood that the sound-generating device 100 is applicable to electronic devices or terminal devices. The electronic devices may be headphones, VR, AR, Glass, etc., without limitation. The terminal devices may be vehicles and other devices, without limitation.

[0076] In this embodiment, the sound-emitting device 100 is configured as a double-sided sound-emitting structure, so that a diaphragm structure vibrates on each side to produce sound, thereby reducing the additional vibration caused by the speaker while saving space and ensuring sufficient sensitivity. The sound-emitting device 100 of this application is designed based on the spatial layout characteristics of the various components of the double-sided speaker, combining the double-column hidden beam method and gantry structure in engineering mechanics to design a new double-sided speaker structure. The internal magnetic circuit and the U iron are connected by a crossbeam structure, which has the characteristics of light weight and small size. The top and bottom surfaces of the overall appearance of the double-sided sound-emitting structure are both rectangular structures.

[0077] As can be understood, the sound-generating device 100 employs a double-sided diaphragm and dual voice coils, sharing a common magnetic circuit system. This not only improves driving force and sensitivity, but also increases the utilization of the magnetic circuit system 3, increasing driving force and increasing the vibration space of the vibration system 2, effectively improving sensitivity. Furthermore, it can reduce the height and weight of the sound-generating device 100 in the Z direction, reducing vibration of the sound-generating device housing. Furthermore, the sound-generating device 100 of the present application utilizes a more compact design for the magnetic circuit system 3 and the vibration system 2, making it convenient for installation in environments similar to vehicle doors and other baffles.

[0078] 1 to 8 , in an embodiment of the present invention, the sound-generating device 100 includes a housing 1, a vibration system 2, and a magnetic circuit system 3, wherein the housing 1 is provided with a cavity 111 with openings at both ends, the vibration system 2 includes a first vibration component 21 and a second vibration component 22, the first vibration component 21 includes a first diaphragm component 211 and a first voice coil 212 connected to the first diaphragm component 211, the second vibration component 22 includes a second diaphragm component 221 and a second voice coil 222 connected to the second diaphragm component 221, the first diaphragm component 211 and the second diaphragm component 212 are connected to the second diaphragm component 211. The components 221 are respectively connected to the two ends of the shell 1 and cover the opening. The first voice coil 212 is a rectangular voice coil, and the second voice coil 222 is a runway-shaped voice coil. The magnetic circuit system 3 is arranged between the first diaphragm component 211 and the second diaphragm component 221. The magnetic circuit system 3 has a first magnetic gap 31 and a second magnetic gap 32. The second magnetic gap 32 is arranged around the first magnetic gap 31, and at least part of the first magnetic gap 31 is connected to the second magnetic gap 32. One end of the first voice coil 212 is suspended in the first magnetic gap 31, and one end of the second voice coil 222 is suspended in the second magnetic gap 32.

[0079] In this embodiment, the housing 1 of the sound-generating device 100 is used to mount, secure, and protect components such as the vibration system 2 and the magnetic circuit system 3. In other words, the housing 1 provides a mounting base for the vibration system 2 and the magnetic circuit system 3. It is understood that the housing 1 may be a mounting shell, a fixed shell, a mounting box, a box, a cylinder, or a frame having a cavity 111.

[0080] It can be understood that the shell 1 can be an integrated structure, which can improve the structural strength and sealing of the shell 1. For example, the shell 1 is a cylindrical structure with openings at both ends, and a cavity 111 is formed in the shell 1. Of course, in other embodiments, the shell 1 can also be a split structure, for example, the shell 1 includes a basin frame, a first end cover and a second end cover, and the first end cover and the second end cover are respectively docked and connected to the two sides of the basin frame, and enclosed to form the cavity 111, etc., which is not limited here. It should be noted that the first end cover and the second end cover of the shell 1 can be a flat plate structure, or a U-shaped groove structure, or the first end cover and the second end cover are both U-shaped groove structures, which is not limited here.

[0081] In this embodiment, the vibration system 2 is configured as a first vibration component 21 and a second vibration component 22. The first vibration component 21 and the second vibration component 22 are respectively connected to the two ends of the housing 1 and cover the openings at both ends of the cavity 111, so that a rear acoustic cavity is formed between the first vibration component 21 and the second vibration component 22. It can be understood that the openings at both ends of the housing 1 form two sound outlets, and the first diaphragm component 211 of the first vibration component 21 and the second diaphragm component 221 of the second vibration component 22 are respectively provided to correspond to the two sound outlets.

[0082] It can be understood that the magnetic circuit system 3 is arranged in the rear sound cavity, that is, the magnetic circuit system 3 is located between the first vibration component 21 and the second vibration component 22, so that the first vibration component 21 and the second vibration component 22 share a magnetic circuit system 3, which effectively improves the utilization rate of the magnetic field. At the same time, the first vibration component 21 and the second vibration component 22 move closer to or away from each other, which can reduce the vibration of the shell during the operation of the sound-emitting device.

[0083] Of course, in other embodiments, the side of the first vibration component 21 facing away from the rear sound cavity is enclosed with the shell 1 to form a front sound cavity, and the side of the second vibration component 22 facing away from the rear sound cavity is enclosed with the shell 1 to form a front sound cavity. It can be understood that the two front sound cavities of the sound-emitting device 100 can be interconnected or independent of each other. The front sound cavity and the rear sound cavity are two independent cavities and are not connected to each other. One or two front sound holes can also be provided on the shell 1. Optionally, the two front sound cavities of the sound-emitting device 100 are independent of each other. There are two front sound holes, each of which is connected to a front sound cavity, which is not limited here.

[0084] It should be noted that the two front sound holes can be arranged on the same side or different sides of the shell 1. Optionally, the two front sound holes are arranged on the same side of the shell 1. Of course, in order to maintain the air pressure balance in the rear sound cavity, the shell 1 is also provided with a rear sound hole connecting the rear sound cavity and the outside world. It can be understood that the two front sound holes and the rear sound hole are located on different sides of the shell 1, so that when the sound-emitting device 100 is installed on the door of the vehicle body, the front sound holes can be conveniently directed to emit sound into the vehicle, and the rear sound holes are connected to the space inside the door, so as to effectively ensure the air pressure balance in the front sound cavity and the rear sound cavity, thereby ensuring the sound effect of the sound-emitting device 100.

[0085] Of course, in other embodiments, when the sound-emitting device 100 is used in structures such as smart glasses, the front sound hole and the rear sound hole are located on different sides of the housing 1, so that the distance between the front sound hole and the rear sound hole is different, thereby achieving the technical effect of far-field noise cancellation. Optionally, the two front sound holes and the rear sound hole are located on opposite sides of the housing 1, forming a dipole effect, thereby achieving far-field noise cancellation of the sound-emitting device 100 and improving the user experience of the sound-emitting device 100. This is not limited here.

[0086] Optionally, the two front sound holes and the rear sound hole are located on opposite sides of the shell 1, and the two front sound holes radiate sound waves of the same phase, and the sound waves radiated by the rear sound hole are opposite in phase to the sound waves radiated by the front sound holes to form a dipole effect, thereby achieving sound attenuation of the sound-emitting device 100 in the rear sound cavity and improving the user experience of the sound-emitting device 100.

[0087] In this embodiment, the first vibration component 21 is configured as a first diaphragm component 211 and a first voice coil 212 connected to the first diaphragm component 211, and the second vibration component 22 is configured as a second diaphragm component 221 and a second voice coil 222 connected to the second diaphragm component 221. The first diaphragm component 211 and the second diaphragm component 221 are respectively connected to the two ends of the housing 1 and cover the opening. The first voice coil 212 is a rectangular voice coil, and the second voice coil 222 is a runway-shaped voice coil. In addition, the magnetic circuit system 3 is disposed between the first diaphragm component 211 and the second diaphragm component 221, and a first magnetic gap 31 and a second magnetic gap 32 are respectively provided in the magnetic circuit system 3 corresponding to the first voice coil 212 and the second voice coil 222. The second magnetic gap 32 is disposed around the first magnetic gap 31, and at least a portion of the first magnetic gap 31 is connected to the second magnetic gap 32. In this way, one end of the first voice coil 212 can be conveniently suspended in the first magnetic gap 31, and one end of the second voice coil 222 can be conveniently suspended in the second magnetic gap 32.

[0088] It will be appreciated that the first voice coil 212 is a rectangular voice coil, and the shape and profile of the first magnetic gap 31 are comparable or similar to the shape and profile of the first voice coil 212, that is, the first magnetic gap 31 is also a rectangular magnetic gap. Optionally, the first voice coil 212 is a rectangular voice coil, and the first magnetic gap 31 is also a rectangular magnetic gap. The second voice coil 222 is a racetrack-shaped voice coil, and the shape and profile of the second magnetic gap 32 are comparable or similar to the shape and profile of the second voice coil 222, that is, the second magnetic gap 32 is also a racetrack-shaped magnetic gap. By setting the first voice coil 212 as a rectangular voice coil and the second voice coil 222 as a runway-shaped voice coil, the structural characteristics of the first voice coil 212 and the second voice coil 222 are utilized to reduce the effective diameter difference between the two voice coils, making it easier to match the weight, and rationally utilizing the spatial arrangement of the first voice coil 212 and the second voice coil 222 to effectively reduce the weight and volume, which not only improves the utilization rate of the magnetic circuit system 3 and effectively increases the driving force, but also increases the vibration space of the vibration system 2, effectively improves the sensitivity, and can reduce the height and weight of the sound-emitting device 100 in the Z direction, reduce the vibration of the shell 1 caused by the vibration system 2, and make the top and bottom surfaces of the overall appearance of the double-sided sound-emitting device 100 both have rectangular structures, as shown in Figure 1.

[0089] The sound-generating device 100 of the present invention is convenient for installing, fixing and supporting the vibration system 2 and the magnetic circuit system 3 by setting the shell 1 as a cavity 111 structure with openings at both ends. By setting the vibration system 2 as a first vibration component 21 and a second vibration component 22, the first diaphragm component 211 of the first vibration component 21 and the second diaphragm component 221 of the second vibration component are respectively connected to the two ends of the shell 1, and the openings are covered to form a vibration space between the first diaphragm component 211 and the second diaphragm component 221, so that the sound-generating device 100 has a double-sided sound-generating function; at the same time, the first voice coil 212 is set as a rectangular voice coil, and the second voice coil 222 is set as a runway-shaped voice coil. By setting the magnetic circuit system 3 between the first diaphragm component 211 and The vibration space between the second diaphragm assembly 221 is provided, and a first magnetic gap 31 and a second magnetic gap 32 are provided in the magnetic circuit system 3, so that the second magnetic gap 32 is arranged around the first magnetic gap 31, and at least part of the first magnetic gap 31 is connected to the second magnetic gap 32. In this way, one end of the first voice coil 212 can be suspended in the first magnetic gap 31, and one end of the second voice coil 222 can be suspended in the second magnetic gap 32, thereby cleverly making full use of the space of the runway-shaped voice coil and the rectangular voice coil, reducing the effective diameter difference between the two voice coils, making it easier to match the weight, and also improving the utilization rate of the magnetic circuit system 3, effectively increasing the driving force, effectively improving the sensitivity, and reducing the height and weight of the sound-emitting device 100 in the Z direction, thereby reducing the vibration of the shell 1 caused by the vibration system 2.

[0090] In one embodiment, the shell 1 is further provided with an installation cavity located in the accommodating cavity 111, and the magnetic circuit system 3 includes an external magnetic circuit portion 33, a connecting member 34 and a central magnetic circuit portion 35. The external magnetic circuit portion 33 is arranged in the installation cavity, and the external magnetic circuit portion 33 forms an accommodating cavity 332. The connecting member 34 is arranged in the accommodating cavity 332. The connecting member 34 includes a first connecting portion 341 and two second connecting portions 342. The two second connecting portions 342 are respectively connected to the two ends of the first connecting portion 341 and are connected to the external magnetic circuit portion 33. The central magnetic circuit portion 35 is arranged in the accommodating cavity 332 and is fixedly connected to the first connecting portion 341; wherein, one end of the central magnetic circuit portion 35 and the outer side of the two second connecting portions 342 cooperate with one end of the external magnetic circuit portion 33 to form a second magnetic gap 32, and the other end of the central magnetic circuit portion 35 and the other end of the external magnetic circuit portion 33 and the inner side of the two second connecting portions 342 enclose to form a first magnetic gap 31.

[0091] In this embodiment, as shown in Figures 2 to 8 , the second magnetic gap 32 of the magnetic circuit system 3 is disposed around the first magnetic gap 31, and at least a portion of the first magnetic gap 31 is connected to the second magnetic gap 32. It will be appreciated that to facilitate the installation and fixation of the magnetic circuit system 3, a mounting cavity is provided within the housing 111 of the housing 1, thereby facilitating the installation, fixation, and support of the magnetic circuit system 3. Alternatively, the mounting cavity may be a through-cavity structure with both ends open.

[0092] For the convenience of the first voice coil 212 of the first vibrating assembly 21 and the second voice coil 222 of the second vibrating assembly 22 sharing a magnetic circuit system 3, as shown in Figures 2 to 8, in this embodiment, the magnetic circuit system 3 is provided with an outer magnetic circuit portion 33, a connector 34, and a central magnetic circuit portion 35. The outer magnetic circuit portion 33 is provided in the mounting cavity, and an accommodating cavity 332 is formed in the outer magnetic circuit portion 33, so that the central magnetic circuit portion 35 is mounted and fixed on the connector 34, thereby being connected to the outer magnetic circuit portion 33 via the connector 34, so that the connector 34 and the central magnetic circuit portion 35 are located in the accommodating cavity 332 in the outer magnetic circuit portion 33.

[0093] It can be understood that by setting the connecting member 34 as a first connecting part 341 and two second connecting parts 342, and connecting the two second connecting parts 342 to the two ends of the first connecting part 341 respectively, the connecting member 34 is connected to the outer magnetic circuit part 33 through the two second connecting parts 342, and the central magnetic circuit part 35 is fixedly connected to the first connecting part 341, so that one end of the central magnetic circuit part 35 and the outer sides of the two second connecting parts 342 cooperate with one end of the outer magnetic circuit part 33 to form a second magnetic gap 32, and the other end of the central magnetic circuit part 35 and the other end of the outer magnetic circuit part 33 and the inner sides of the two second connecting parts 342 are enclosed to form a first magnetic gap 31, that is, in the direction of vibration of the voice coil, the first voice coil 212 arranged in a rectangular shape is located in the second voice coil 222 arranged in a runway shape, as shown in Figure 5.

[0094] Optionally, the two second connecting portions 342 of the connecting member 34 are symmetrically arranged. In this embodiment, the first voice coil 212 and the second voice coil 222 of the first vibrating assembly 21 and the second vibrating assembly 22 are located in the rear acoustic cavity. By connecting one end of the first voice coil 212 to the first vibrating assembly 21, with the other end of the first voice coil 212 suspended within the first magnetic gap 31, and connecting one end of the second voice coil 222 to the second vibrating assembly 22, with the other end of the second voice coil 222 suspended within the second magnetic gap 32, the second magnetic gap 32 surrounds the first magnetic gap 31. This arrangement not only prevents interference between the first and second voice coils 212 and 222 during vibration, but also allows at least a portion of the first magnetic gap 31 to communicate with the second magnetic gap 32, ensuring smooth airflow during vibration of the first and second voice coils 212 and 222, thereby preventing any impact on the vibration performance of the first and second voice coils 212 and 222. Optionally, the first diaphragm assembly 211 and the second diaphragm assembly 221 are symmetrically arranged relative to the magnetic circuit system 3.

[0095] It is understood that the outer magnetic circuit portion 33 can be a single unitary structure, such as an annular structure. Alternatively, the outer magnetic circuit portion 33 can be formed by a combination of multiple separate structures. For example, the outer magnetic circuit portion 33 includes multiple outer magnetic circuit portions 33, which are spaced apart and arranged around the periphery of the central magnetic circuit portion 35. This is not limited here. In this embodiment, the central magnetic circuit portion 35 and the first connecting portion 341 can be fixedly connected by bonding or welding, etc., which is not limited here.

[0096] In one embodiment, the first voice coil 212 has two long axis segments 2121 and two short axis segments 2122 connected end to end, and the second voice coil 222 has two long side segments 2221 and two arc segments 2222 connected end to end; each second connecting portion 342 is located between a short axis segment 2122 and an arc segment 2222 to separate the first magnetic gap 31 and the second magnetic gap 32, and the portion of the first magnetic gap 31 corresponding to the long axis segment 2121 is correspondingly connected to the portion of the second magnetic gap 32 corresponding to the long side segment 2221.

[0097] In this embodiment, as shown in Figures 4 and 5 , the first voice coil 212 arranged in a direction has two long axis segments 2121 and two short axis segments 2122 connected end to end. The second voice coil 222 arranged in a racetrack shape has two long side segments 2221 and two arc segments 2222 connected end to end. It will be understood that the long axis segment 2121 of the first voice coil 212 corresponds to the long side segment 2221 of the second voice coil 222, and the short axis segment 2122 of the first voice coil 212 corresponds to the arc segment 2222 of the second voice coil 222.

[0098] It should be noted that the diameter of the arcuate segment 2222 of the second voice coil 222 (i.e., the distance between the two long side segments 2221 of the second voice coil 222) is greater than the length of the short axis segment 2122 of the first voice coil 212. Because the arcuate segment 2222 of the second voice coil 222 is convex in a direction away from the short axis segment 2122, a larger space is formed between the short axis segment 2122 of the first voice coil 212 and the arcuate segment 2222 of the second voice coil 222, thereby facilitating the installation of the two second connecting portions 342 of the connecting member 34.

[0099] In this embodiment, each second connecting portion 342 of the connecting member 34 is located between a short axis segment 2122 and an arcuate segment 2222. Thus, the connecting member 34 separates the first magnetic gap 31 and the second magnetic gap 32, and the portion of the first magnetic gap 31 corresponding to the long axis segment 2121 is connected to the portion of the second magnetic gap 32 corresponding to the long side segment 2221. In other words, the side of the first magnetic gap 31 corresponding to the short axis segment 2122 is separated from the side of the second magnetic gap 32 corresponding to the arcuate segment 2222 by the second connecting portion 342, while the side of the first magnetic gap 31 corresponding to the long axis segment 2121 is connected to the side of the second magnetic gap 32 corresponding to the long side segment 2221 without any structural or blocking separation.

[0100] Optionally, the length of the long axis segment 2121 of the first voice coil 212 is equivalent to the length of the long side segment 2221 of the second voice coil 222. Such a setting can reduce the gap between the two voice coils, thereby ensuring that the BL values ​​of the first voice coil 212 and the second voice coil 222 are equivalent, and making the first voice coil 212 and the second voice coil 222 vibrate in the same phase (that is, vibrate outward or inward at the same time), thereby driving the sound of the first diaphragm assembly 211 and the second diaphragm assembly 221 to be in the same phase.

[0101] Optionally, the distance between the long axis segment 2121 of the first voice coil 212 and the long side segment 2221 of the second voice coil 222 is 0.8 mm to 1.5 mm. Such a setting can effectively prevent the two voice coils from rubbing against each other while minimizing the gap between the voice coils. That is, no components are placed between the long axis segment 2121 of the first voice coil 212 and the long side segment 2221 of the second voice coil 222.

[0102] It is understood that the distance between the long axis segment 2121 of the first voice coil 212 and the long side segment 2221 of the second voice coil 222 is the distance between the long axis segment 2121 and the long side segment 2221 located on the same side. Optionally, the distance between the long axis segment 2121 of the first voice coil 212 and the long side segment 2221 of the second voice coil 222 is 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, etc., which is not limited here.

[0103] In this embodiment, by setting the two second connecting parts 342 of the connecting member 34 to a symmetrical structure, the two second connecting parts 342 of the connecting member 34 can be connected to the outer magnetic circuit part 33 of the magnetic circuit system 3 to achieve stable installation, and the first connecting part 341 of the connecting member 34 can be used to achieve stable installation of the central magnetic circuit part 35, thereby improving the balance of the sound-generating device 100 and improving the sound effect. Optionally, the connecting member 34 is provided at the middle position of the outer magnetic circuit part 33 of the magnetic circuit system 3 and the middle position of the central magnetic circuit part 35. It is understandable that in order to improve the connection stability effect, the connecting member 34 can be connected to the outer magnetic circuit part 33 and the central magnetic circuit part 35 by means of adhesive or welding, etc., which is not limited here.

[0104] In one embodiment, the first connecting portion 341 and the two second connecting portions 342 are combined to form a placement groove 343; the central magnetic circuit portion 35 includes a first washer 351, a first magnet 352, a second washer 353, a second magnet 354 and a third washer 355 arranged in a stacked manner, and the first connecting portion 341 is arranged between the second washer 353 and the second magnet 354, so that the first washer 351, the first magnet 352 and the second washer 353 are located in the placement groove 343, and are spaced from the second connecting portion 342 to cooperate to form a first magnetic gap 31, and the second magnet 354 and the third washer 355 are located outside the placement groove 343, and cooperate with one end of the outer magnetic circuit portion 33 to form a second magnetic gap 32.

[0105] In this embodiment, as shown in Figures 2 to 8 , the first washer 351, first magnet 352, second washer 353, second magnet 354, and third washer 355 of the central magnetic circuit portion 35 are plate-shaped and stacked. Central magnetic circuit portion 35 is fixedly connected to outer magnetic circuit portion 33 via connector 34. This not only ensures the secure installation of central magnetic circuit portion 35, but also increases the thickness of first magnet 352 and second magnet 354 in central magnetic circuit portion 35, thereby increasing magnetic field utilization and providing driving force for first voice coil 212 and second voice coil 222.

[0106] As can be understood, by positioning a portion of the central magnetic circuit portion 35 within the placement groove 343 of the connector 34 and on the side of the connector 34 facing away from the placement groove 343, the connection stability between the central magnetic circuit portion 35 and the connector 34 is improved. Thus, the first washer 351, first magnet 352, and second washer 353 of the central magnetic circuit portion 35 are spaced apart from the second connecting portion 342 to form the first magnetic gap 31, and the second magnet 354 and third washer 355 of the central magnetic circuit portion 35 are positioned with one end of the outer magnetic circuit portion 33 to form the second magnetic gap 32. This not only achieves secure installation, but also effectively increases the thickness of the magnet in a sound-generating device 100 of the same size, thereby improving magnetic field utilization and providing driving force for the first voice coil 212 and the second voice coil 222. Furthermore, in a sound-generating device 100 with the same magnet thickness, the height of the sound-generating device 100 in the Z direction can be reduced. Of course, in the sound-generating device 100 with the same magnet thickness and the same size, the vibration space of the first vibration component 21 and the second vibration component 22 can be effectively increased to improve the sensitivity of the sound-generating device 100.

[0107] In one embodiment, the second washer 353 has a first surface 3531 facing the first magnet 352 and a second surface 3532 facing the second magnet 354. The second surface 3532 is recessed to form a fixing groove 3533, which passes through the second washer 353 along the direction of the long axis segment 2121. The first connecting portion 341 is disposed in the fixing groove 3533.

[0108] In this embodiment, as shown in Figures 2 to 4, 7, and 8, a fixing groove 3533 is recessed in the second surface 3532 of the second washer 353. This groove 3533 is then connected and secured to the first connecting portion 341 of the connector 34. Furthermore, the second surface 3532 of the second washer 353 cooperates with the first connecting portion 341 and two second connecting portions 342 of the connector 34 to provide mounting and support for the second magnet 354 and the third washer 355, further enhancing mounting stability. It will be appreciated that the first connecting portion 341 is secured to the fixing groove 3533 of the second washer 353 by gluing, which is not a limitation herein.

[0109] Optionally, the fixing groove 3533 extends through the second washer 353 along the direction of the long axis segment 2121. In this embodiment, the side of the first connecting portion 341 facing the second magnet 354 is flush with the second surface 3532. This effectively increases the contact area between the second magnet 354, the second surface 3532 of the second washer 353, and the first connecting portion 341 and two second connecting portions 342 of the connecting member 34, thereby improving stability.

[0110] As can be understood, the width of the fixing groove 3533 along the minor axis 2122 is greater than its depth along the axial direction of the second magnetic gap 32. This arrangement effectively improves the connection stability between the first connecting portion 341 and the second washer 353. It should be noted that the depth of the fixing groove 3533 along the axial direction of the second magnetic gap 32 is less than the thickness of the second washer 353. In other words, the fixing groove 3533 does not penetrate the second washer 353 in the vibration direction of the voice coil. This allows the fixing groove 3533 to secure the first connecting portion 341 while also allowing the second magnet 354 to cooperate with the second surface 3532 of the second washer 353, the first connecting portion 341, and the two second connecting portions 342 of the connector 34 to improve the connection stability between the first connecting portion 341 and the central magnetic circuit portion 35.

[0111] Optionally, the width of the fixing groove 3533 along the minor axis section 2122 is 2 mm to 3.5 mm. In this embodiment, the width of the fixing groove 3533 along the minor axis section 2122 can be 2 mm, 2.3 mm, 2.5 mm, 2.8 mm, 3 mm, 3.3 mm, 3.5 mm, etc., without limitation herein. Optionally, the depth of the fixing groove 3533 along the axial direction of the second magnetic gap 32 is 1.5 mm to 2.5 mm. In this embodiment, the depth of the fixing groove 3533 along the axial direction of the second magnetic gap 32 can be 1.5 mm, 1.8 mm, 2 mm, 2.3 mm, 2.5 mm, etc., without limitation herein.

[0112] To ensure that no components are placed between the long axis segment 2121 of the first voice coil 212 and the long side segment 2221 of the second voice coil 222, in this embodiment, the width of the first connecting portion 341 along the short axis segment 2122 is smaller than the width of the second connecting portion 342 along the short axis segment 2122. This ensures positioning and bonding, and the smaller first connecting portion 341 can reduce BL loss.

[0113] It can be understood that the periphery of the second surface 3532 of the second washer 353 cooperates with the two second connecting parts 342 to form a runway-shaped structure, which can cooperate with the second magnet 354 and the third washer 355, so that the periphery of the second magnet 354 and the third washer 355 is flush with the periphery of the second surface 3532 of the second washer 353 and the periphery of the two second connecting parts 342 along the vibration direction of the voice coil.

[0114] In this embodiment, the connector 34 is made of a non-magnetic material. For example, the connector 34 may be made of aluminum alloy or non-magnetic steel, but this is not a limitation. Alternatively, the first washer 351, the second washer 353, and the third washer 355 may be magnetically conductive plates. The first magnet 352 and the second magnet 354 may be permanent magnets.

[0115] In one embodiment, the thickness of the first magnet 352 is greater than the thickness of the second magnet 354. It will be appreciated that the thickness of the first magnet 352 / second magnet 354 is the thickness of the first voice coil 212 / second voice coil 222 along the vibration direction of the first magnetic gap 31 / second magnetic gap 32. Optionally, the ratio of the thickness of the first magnet 352 to the thickness of the second magnet 354 is 1:1 to 2:1.

[0116] It can be understood that, as shown in Figures 2 and 3, by making the thickness of the first magnet 352 greater than the thickness of the second magnet 354, and setting the ratio of the thickness of the first magnet 352 to the thickness of the second magnet 354 to 1:1, 1.5:1, 2:1, etc., the symmetry of the BL curve can be effectively improved and the distortion can be reduced.

[0117] In this embodiment, the thickness of the first washer 351 is greater than that of the third washer 355. The thickness of the first washer 351 is less than that of the second washer 353. The thickness of the third washer 355 is less than that of the second washer 353. It will be appreciated that by configuring the central magnetic circuit portion 35 as a stacked arrangement of the first washer 351, the first magnet 352, the second washer 353, the second magnet 354, and the third washer 355, the magnetization directions of the first magnet 352 and the second magnet 354 are aligned, facilitating assembly.

[0118] In one embodiment, the second washer 353 has a protruding edge 3534 protruding from the periphery of the second surface 3532 , so that the width of the first surface 3531 along the minor axis 2122 is smaller than the width of the second surface 3532 along the minor axis 2122 .

[0119] In this embodiment, as shown in Figures 3, 4, 7, and 8, a flange 3534 is provided on the periphery of the second washer 353 adjacent to the second surface 3532, extending the second surface 3532 to the flange 3534. This ensures that the periphery of the flange 3534 mates with the periphery of the second connecting portion 342 to form a racetrack-shaped structure. It will be appreciated that the shape, profile, and dimensions of the first surface 3531 of the second washer 353 are adapted to those of the first washer 351 and the first magnet 352, such that the peripheries of the first washer 351 and the first magnet 352 are flush with the periphery of the second washer 353 adjacent to the first surface 3531.

[0120] To accommodate the rectangular first voice coil 212, the first washer 351, first magnet 352, and first surface 3531 of the second washer 353 are arranged in a rectangular shape. Optionally, the first surface 3531 is rectangular, and the contours of the first washer 351 and the first magnet 352 are identical to those of the first surface 3531. This provides magnetic flux lines for the first voice coil 212. To accommodate the runway-shaped second voice coil 222, the second magnet 354, third washer 355, and second surface 3532 of the second washer 353 are arranged in a runway shape in conjunction with the second connecting portion 342. This provides magnetic flux lines for the second voice coil 222. This arrangement utilizes the first magnetic gap 31 and the second magnetic gap 32 to provide suspension space for the first and second voice coils 212, 222, respectively. This effectively prevents interference or collision between the first and second voice coils 212, 222 during vibration, while also reducing the height of the sound-generating device 100 in the Z direction.

[0121] In one embodiment, the outer magnetic circuit portion 33 is a U-iron 331, which has a cylindrical structure with openings at both ends to form a receiving cavity 332. One end of the U-iron 331 is bent and extended toward the receiving cavity 332 to form a bending portion 333. The bending portion 333 is connected to the second connecting portion 342. The inner side of the bending portion 333 and the second connecting portion 342 is spaced from one end of the central magnetic circuit portion 35 to enclose a first magnetic gap 31.

[0122] In this embodiment, as shown in Figures 2 to 4 and 6, the outer magnetic circuit portion 33 can be a U-shaped iron 331. The U-shaped iron 331 has a cylindrical structure with both ends open and defines a receiving cavity 332. Optionally, a boss 335 is provided on the outer wall of the U-shaped iron 331. The boss 335 extends toward a side away from the receiving cavity 332. The U-shaped iron 331 is disposed within the mounting cavity, and the boss 335 is in limited contact with an end surface at one end of the mounting cavity.

[0123] As will be appreciated, a boss 335 is provided on one end of the U-shaped iron 331, adjacent to the third washer 355. The boss 335 extends away from the accommodating cavity 332. The U-shaped iron 331 is positioned within the mounting cavity, with the boss 335 engaging a limited end surface of the mounting cavity. As will be appreciated, this arrangement effectively improves the mounting stability of the outer magnetic circuit portion 33. Optionally, the U-shaped iron 331 may be welded to the wall of the mounting cavity; alternatively, the U-shaped iron 331 may be adhesively bonded to the wall. This further enhances the mounting stability of the U-shaped iron 331.

[0124] In this embodiment, the end of the U-shaped iron 331 adjacent to the first washer 351 is bent and extended toward the accommodating cavity 332 to form a bent portion 333. Optionally, the bent portion 333 encloses a rectangular opening, while the end of the U-shaped iron 331 away from the bent portion 333 forms a racetrack-shaped opening. This allows for proper alignment with the first voice coil 212 and the second voice coil 222. Furthermore, the bent portion 333 is connected to the second connecting portion 342 to enhance connection stability.

[0125] It is understood that each second connecting portion 342 is provided with a positioning post 344, and the bent portion 333 is provided with a positioning hole 334 corresponding to each positioning post 344, and the positioning post 344 is inserted into the positioning hole 334. In this embodiment, as shown in Figures 2 and 6, the extension length of the bent portion 333 corresponding to the short axis segment 2122 is greater than the extension length of the bent portion 333 corresponding to the long axis segment 2121. In this way, by providing the positioning hole 334 in the portion of the bent portion 333 corresponding to the short axis segment 2122, the positioning hole 334 and the positioning post 344 of the second connecting portion 342 can be used to provide positioning and installation, and the portion of the bent portion 333 corresponding to the short axis segment 2122 can also be used to provide an installation and support foundation for the connecting member 34 and the central magnetic circuit portion 35.

[0126] In one embodiment, each second connection portion 342 is formed with a first curved side wall 345, a step surface 346, and a second curved side wall 347 connected in sequence on one side facing the inner wall of the accommodating cavity 332. The second curved side wall 347 abuts against the inner wall of the accommodating cavity 332, and the first curved side wall 345 is spaced from the inner wall of the accommodating cavity 332 to cooperate to form a second magnetic gap 32.

[0127] In this embodiment, as shown in Figures 4, 6, and 7, the end surface of the second connecting portion 342 facing away from the first connecting portion 341 is curved. A first curved sidewall 345, a stepped surface 346, and a second curved sidewall 347 are sequentially formed on the side of the second connecting portion 342 facing the inner wall of the accommodating cavity 332. This allows the second curved sidewall 347 to abut against the inner wall of the accommodating cavity 332 to position and install the connector 34. Furthermore, the first curved sidewall 345 is spaced from the inner wall of the accommodating cavity 332 to form the second magnetic gap 32, providing a vibration space for the second voice coil 222.

[0128] It can be understood that in order to ensure that the first washer 351, the first magnet 352 and the second washer 353 are adjacent to the first surface 3531 and the inner side of the second connecting portion 342 to cooperate in forming the first magnetic gap 31, the side of the second connecting portion 342 adjacent to the first connecting portion 341 extends toward the first connecting portion 341 to form a positioning platform, and the outer peripheral end surface of the second washer 353 abuts against the positioning platform to limit the first washer 351, the first magnet 352 and the second washer 353 are adjacent to the first surface 3531 and the inner side of the second connecting portion 342.

[0129] Optionally, the first connecting portion 341 and the two second connecting portions 342 of the connecting member 34 cooperate to form a beam structure or a gantry structure, which can not only provide an installation and support basis for the central magnetic circuit part 35, but also utilize the two second connecting portions 342 of the connecting member 34 to connect and fix with the bending portion 333 of the U iron 331.

[0130] In one embodiment, the first diaphragm assembly 211 and the second diaphragm assembly 221 both include a cone 2111 and a diaphragm 2112 arranged around the cone 2111, the periphery of the diaphragm 2112 is connected to the shell 1, and one end of the first voice coil 212 or the second voice coil 222 is connected to the cone 2111.

[0131] In this embodiment, as shown in Figures 1 to 4, the first vibration assembly 21 and the second vibration assembly 22 are symmetrically arranged relative to the magnetic circuit system 3. It can be understood that by arranging the first vibration assembly 21 and the second vibration assembly 22 into a symmetrical structure, the double-sided sound effect of the sound-generating device 100 is further improved. It can be achieved that when the first vibration assembly 21 and the second vibration assembly 22 vibrate and generate sound, the sound is transmitted through the first diaphragm assembly 211 and the second diaphragm assembly 221, and a superimposed sound effect is formed, thereby improving the sound effect of the sound-generating device 100.

[0132] As can be understood, as shown in Figures 1 to 4, the cone 2111 of the first diaphragm assembly 211 and the cone 2111 of the second diaphragm assembly 221 are symmetrically arranged relative to the rear acoustic cavity. Optionally, the cone 2111 is arranged in a conical structure. The cones 2111 of the first diaphragm assembly 2111 and the second diaphragm assembly 221 adopt an inverted cone structure, which can effectively reduce space. The diaphragm 2112 is connected to the outside of the cone 2111 and is arranged around the cone 2111.

[0133] In this embodiment, the diaphragms 2112 of the first diaphragm assembly 211 and the second diaphragm assembly 221 each include an inner fixing portion, a folded ring portion, and an outer fixing portion connected in sequence. The inner fixing portion is connected to the cone 2111, and the outer fixing portion is connected to the housing 1. In this embodiment, to facilitate the connection between the diaphragms 2112 and the cone 2111, the inner fixing portion of the diaphragm 2112 is attached to one side of the cone 2111. Optionally, the two diaphragms 2112 are arranged symmetrically with respect to the magnetic circuit system 3.

[0134] In one embodiment, the first vibration component 21 and the second vibration component 22 further include a bracket 213 and a centering support 214. The bracket 213 is connected to the cone 2111 and surrounds the first voice coil 212 or the second voice coil 222. One end of the centering support 214 is connected to the bracket 213, and the other end of the centering support 214 is connected to the shell 1.

[0135] In this embodiment, as shown in Figures 2 to 4 , centering supports 214 are provided, with one end of each support 214 connected to bracket 213 and the other end connected to housing 1 . This effectively prevents polarization or oscillation of cone 2111 when it vibrates with first voice coil 212 or second voice coil 222. Optionally, both support 214 are elastic wave structures.

[0136] Optionally, the centering support 214 has an annular structure. The inner side of the centering support 214 is connected to the bracket 213, and the outer side of the centering support 214 is connected to the housing 1. Optionally, the two centering supports 214 are arranged symmetrically with respect to the magnetic circuit system 3. In this embodiment, the two centering supports 214 are arranged in parallel, which is not limited here.

[0137] In one embodiment, the housing 1 includes an outer shell 11, an installation portion 12 and a fixing portion 13, wherein the outer shell 11 is a cylindrical structure with openings at both ends, the outer shell 11 has a cavity 111, the installation portion 12 is provided with a mounting cavity and is located in the cavity 111, and the fixing portion 13 is provided in the cavity 111 and connects the outer shell 11 and the installation portion 12.

[0138] In this embodiment, as shown in Figures 1 to 3, the outer shell 11 of the housing 1 is a cylindrical structure with both ends open, and the mounting portion 12 is configured as a cylindrical structure with both ends open, so that the outer shell 11 is connected to the mounting portion 12 via the fixing portion 13. Of course, in other embodiments, the housing 1 further includes a first end cover, a second end cover, and other structures, which are not limited here.

[0139] It can be understood that the shell 11 is provided with a rear sound hole, the first end cover is connected to one end of the shell 11, and is opposite to and spaced apart from the mounting portion 12, the first end cover and the shell 11 are enclosed to form a front sound hole, the second end cover is connected to the other end of the shell 11, and is opposite to and spaced apart from the mounting portion 12, and the second end cover and the shell 11 are enclosed to form a front sound hole; wherein, the first vibration component 21 is connected to the shell 11, and is opposite to and spaced apart from the mounting cavity, and the second vibration component 22 is connected to the shell 11, and is opposite to and spaced apart from the mounting cavity.

[0140] In this embodiment, by setting the shell 1 as an integral structure and cooperating with the shell structure that forms the specific cavity 111, the structural strength of the shell 1 can be improved, and the disassembly and assembly of components such as the vibration system 2 and the magnetic circuit system 3 can be facilitated. It can be understood that the mounting portion 12 of the shell 1 can be optionally a cylindrical structure with openings at both ends. By locating the outer shell 11 on the outside of the mounting portion 12, the shell 1 can be conveniently used to install and fix the first diaphragm assembly 211 and the second diaphragm assembly 221 respectively using the outer shell 11, thereby improving the installation stability. At the same time, the shell 11 and the mounting portion 12 are connected as an integral structure through the fixing portion 13 to improve the structural stability. Optionally, the shell 11, the fixing portion 13 and the mounting portion 12 are an integrally formed structure.

[0141] It can be understood that the shell 1 can be a plastic shell, which is convenient for processing; the shell 1 can also be a metal shell, which can not only increase the sound cavity volume of the sound-emitting device 100, but also improve the heat dissipation effect; of course, the shell 1 can also be a structure integrally formed of plastic and metal, which is not limited here.

[0142] In one embodiment, as shown in Figures 2 and 3, two centering supports 214 are located on opposite sides of the fixed portion 13 and are symmetrically arranged relative to the fixed portion 13. Two brackets 213 are located on opposite sides of the fixed portion 13 and are symmetrically arranged relative to the fixed portion 13. Two diaphragms 2112 are located on opposite sides of the fixed portion 13 and are symmetrically arranged relative to the fixed portion 13. Optionally, each diaphragm 2112 includes an inner fixing portion, a folding ring portion, and an outer fixing portion connected in sequence, the inner fixing portion being connected to the cone 2111, and the outer fixing portion being connected to the housing 1.

[0143] It is understood that to prevent the vibration of the bracket 213 from interfering with the mounting portion 12 when the first voice coil 212 / second voice coil 222 drives the vibration of the first diaphragm assembly 211 / second diaphragm assembly 221, and thus drives the vibration of the bracket 213 and the centering support 214, in this embodiment, the distance between the bracket 213 and the mounting portion 12 is 1 mm to 2 mm. Optionally, the distance between the bracket 213 and the mounting portion 12 can be 1 mm, 1.3 mm, 1.5 mm, 1.8 mm, 2 mm, etc., to ensure that the bracket 213 does not rub against the mounting portion 12 during vibration, which is not limited here.

[0144] In one embodiment, as shown in Figures 2 to 4, the skeletons of the first voice coil 212 and the second voice coil 222 are provided with a first through hole 2123, the bracket 213 is provided with a second through hole 2131, and the fixing portion 13 is provided with a third through hole 131. This arrangement ensures that the air in the rear acoustic cavity flows and is uniform in real time.

[0145] In order to improve the connection stability between the centering support piece 214 and the shell 1, as shown in Figures 2 and 3, two support platforms 112 are provided on the inner wall of the shell 11. The two support platforms 112 are arranged on opposite sides of the fixing part 13, and the periphery of each centering support piece 214 is connected to a support platform 112.

[0146] The sound-generating device 100 of the present application features ultra-thinness and lightness. By adding a cross-beam connector 34, the central magnetic circuit portion 35 and the U-iron 331 are securely connected. The second connector 342 of the connector 34 cleverly utilizes the space between the short axes of the two voice coils, effectively utilizing the space between the racetrack-shaped and rectangular voice coils. This reduces the difference in effective diameter between the two voice coils and facilitates weight matching. Furthermore, the sophisticated design of the first connector 341 and the second connector 342 of the connector 34 reduces the difficulty of magnetic circuit design, component manufacturing, and assembly for the double-sided sound-generating device 100, making it easier to manufacture and mass-produce. Furthermore, its robustness makes it easier to pass reliability tests. Furthermore, the optimized design of the inverted cone and centering support effectively utilizes space and reduces the overall thickness of the sound-generating device 100. The magnetic circuit design and dual voice coil structure minimize the difference in diameter between the two voice coils and reduce the weight of the magnetic circuit.

[0147] The present invention also provides a terminal device, comprising a device body and the aforementioned sound-generating device 100, connected to the device body. The specific structure of the sound-generating device 100 is similar to that of the aforementioned embodiments. Since the present terminal device utilizes all the technical solutions of all the aforementioned embodiments, it at least possesses all the beneficial effects brought about by the technical solutions of the aforementioned embodiments, and therefore will not be further elaborated here.

[0148] In this embodiment, the device body is provided with a first sound outlet and a second sound outlet. The first sound outlet corresponds to the first diaphragm assembly 211 / the second diaphragm assembly 221 of the sound-emitting device 100 , and the second sound outlet is connected to the rear sound hole of the sound-emitting device 100 .

[0149] It is understood that there can be only one first sound outlet, which can be connected to the first diaphragm assembly 211 and the second diaphragm assembly 221 of the sound-emitting device 100 through the sound channel. Of course, in other embodiments, the first sound outlet can also include two sub-sound outlets, and the two sub-sound outlets can be connected to the first diaphragm assembly 211 and the second diaphragm assembly 221 respectively, which is not limited here.

[0150] Optionally, the terminal device can be a vehicle, a wearable device, or the like, which is not limited here. In this embodiment, a vehicle is used as an example for illustration. The device body includes a vehicle door, which is provided with an installation space and a sound outlet connected to the installation space. The sound-emitting device 100 is installed in the installation space, and the front sound hole of the sound-emitting device 100 is provided corresponding to the sound outlet, which is not limited here.

[0151] The above descriptions are merely optional embodiments of the present invention and do not limit the patent scope of the present invention. All equivalent structural transformations made based on the contents of the present invention's description and drawings, or direct / indirect applications 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: A shell, wherein the shell is provided with a cavity with openings at both ends; A vibration system, the vibration system comprising a first vibration component and a second vibration component, the first vibration component comprising a first diaphragm component and a first voice coil connected to the first diaphragm component, the second vibration component comprising a second diaphragm component and a second voice coil connected to the second diaphragm component, the first diaphragm component and the second diaphragm component are respectively connected to two ends of the shell and cover the opening, the first voice coil is a rectangular voice coil, and the second voice coil is a racetrack-shaped voice coil; and A magnetic circuit system, wherein the magnetic circuit system is arranged between the first diaphragm assembly and the second diaphragm assembly, the magnetic circuit system is provided with a first magnetic gap and a second magnetic gap, the second magnetic gap is arranged around the first magnetic gap, and at least a portion of the first magnetic gap is connected to the second magnetic gap, one end of the first voice coil is suspended in the first magnetic gap, and one 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 housing is further provided with a mounting cavity located in the containing cavity, and the magnetic circuit system comprises: An external magnetic circuit portion, the external magnetic circuit portion is arranged in the installation cavity, and the external magnetic circuit portion is formed with a containing cavity; A connecting member, the connecting member is disposed in the accommodating cavity, the connecting member comprises a first connecting portion and two second connecting portions, the two second connecting portions are respectively connected to two ends of the first connecting portion, and are connected to the external magnetic circuit portion; and a central magnetic circuit portion, the central magnetic circuit portion being disposed in the accommodating cavity and fixedly connected to the first connecting portion; Among them, one end of the central magnetic circuit part and the outer sides of the two second connecting parts cooperate with one end of the outer magnetic circuit part to form the second magnetic gap, and the other end of the central magnetic circuit part, the other end of the outer magnetic circuit part and the inner sides of the two second connecting parts enclose to form the first magnetic gap.

3. The sound-generating device according to claim 2, characterized in that: The first voice coil has two long axis segments and two short axis segments connected end to end, and the second voice coil has two long side segments and two arc segments connected end to end; Each of the second connecting portions is located between a short axis segment and an arc segment to separate the The first magnetic gap and the second magnetic gap, the part of the first magnetic gap corresponding to the long axis segment is connected to the part of the second magnetic gap corresponding to the long side segment.

4. The sound-generating device according to claim 3, characterized in that: The first connection portion and the two second connection portions enclose a placement groove; The central magnetic circuit portion includes a first washer, a first magnet, a second washer, a second magnet and a third washer which are stacked together. The first connecting portion is arranged between the second washer and the second magnet so that the first washer, the first magnet and the second washer are located in the placement groove and are spaced from the second connecting portion to cooperate to form the first magnetic gap. The second magnet and the third washer are located outside the placement groove and cooperate with one end of the outer magnetic circuit portion to form the second magnetic gap.

5. The sound generating device according to claim 4, characterized in that: The second washer has a first surface facing the first magnet and a second surface facing the second magnet. The second surface is concavely formed with a fixing groove, which passes through the second washer along the direction of the long axis segment. The first connecting portion is arranged in the fixing groove.

6. The sound generating device according to claim 5, characterized in that: A side of the first connecting portion facing the second magnet is arranged flush with the second surface; And / or, the width of the fixing groove along the direction of the minor axis segment is greater than the depth of the fixing groove along the axial direction of the second magnetic gap; And / or, the width of the fixing groove along the direction of the short axis segment is 2 mm to 3.5 mm; And / or, the depth of the fixing groove along the axial direction of the second magnetic gap is 1.5 mm to 2.5 mm; And / or, the width of the first connecting portion along the direction of the short axis segment is smaller than the width of the second connecting portion along the direction of the short axis segment; And / or, the distance between the long axis segment and the long side segment is 0.8 mm to 1.5 mm; And / or, the length of the long axis segment is equal to the length of the long side segment; And / or, the connecting piece is made of non-magnetic material.

7. The sound generating device according to claim 5, characterized in that: The thickness of the first magnet is greater than the thickness of the second magnet; And / or, the ratio of the thickness of the first magnet to the thickness of the second magnet is 1:1 to 2:1; And / or, the magnetization direction of the first magnet and the second magnet is the same; And / or, the thickness of the first washer is greater than the thickness of the third washer; And / or, the thickness of the first washer is smaller than the thickness of the second washer; And / or, the thickness of the third washer is smaller than the thickness of the second washer; And / or, the second washer is provided with a convex edge at the periphery of the second surface adjacent to the second surface, so that the width of the first surface along the direction of the short axis segment is smaller than the width of the second surface along the direction of the short axis segment; And / or, the first surface is arranged in a rectangular shape, and the outer contour of the first washer and the outer contour of the first magnet are the same as the first surface.

8. The sound generating device according to claim 2, characterized in that: The outer magnetic circuit portion is a U-iron, which is a cylindrical structure with openings at both ends to form the accommodating cavity. One end of the U-iron is bent and extended toward the accommodating cavity to form a bent portion, and the bent portion is connected to the second connecting portion. The inner sides of the bent portion and the second connecting portion are spaced from one end of the central magnetic circuit portion to enclose and form the first magnetic gap.

9. The sound generating device according to claim 8, characterized in that: The bent portion encloses a rectangular opening, and the end of the U iron away from the bent portion forms a runway-shaped opening; And / or, each of the second connecting parts is provided with a positioning post, the bending part is provided with a positioning hole corresponding to each of the positioning posts, and the positioning post is inserted into the positioning hole; And / or, each second connection portion is formed with a first arcuate side wall, a step surface and a second arcuate side wall connected in sequence on one side facing the inner wall of the accommodating cavity, the second arcuate side wall abuts against the inner wall of the accommodating cavity, and the first arcuate side wall is spaced from the inner wall of the accommodating cavity to cooperate to form the second magnetic gap; And / or, a boss is protruding from the outer wall of the U-iron, the boss extends toward a side away from the accommodating cavity, the U-iron is arranged in the installation cavity, and the boss is limitedly abutted against an end surface of one end of the installation cavity; And / or, the U iron is connected to the cavity wall of the installation cavity by welding; or, the U iron is connected to the cavity wall of the installation cavity by bonding.

10. The sound generating device according to any one of claims 1 to 9, characterized in that: The first diaphragm assembly and the second diaphragm assembly both include a cone and a diaphragm arranged around the cone, the periphery of the diaphragm is connected to the shell, and one end of the first voice coil or the second voice coil is connected to the cone.

11. The sound generating device according to claim 10, characterized in that: The first vibration component and the second vibration component also include a bracket and a centering support plate, the bracket is connected to the cone and surrounds the first voice coil or the second voice coil, one end of the centering support plate is connected to the bracket, and the other end of the centering support plate is connected to the shell.

12. The sound generating device according to claim 11, characterized in that: The housing comprises: A shell, the shell is a cylindrical structure with two ends open, and the shell has the cavity; An installation portion, the installation portion being provided with an installation cavity and being located in the containing cavity; and A fixing portion is disposed in the cavity and connects the housing and the mounting portion.

13. The sound generating device according to claim 12, characterized in that: The centering support piece is a spring wave structure; And / or, the two centering support plates are located on opposite sides of the fixing portion and are symmetrically arranged relative to the fixing portion; And / or, the two brackets are located on opposite sides of the fixing portion and are symmetrically arranged relative to the fixing portion; And / or, the two diaphragms are located on opposite sides of the fixing portion and are symmetrically arranged relative to the fixing portion; And / or, each of the diaphragms comprises an inner fixing portion, a folding ring portion and an outer fixing portion which are connected in sequence, the inner fixing portion is connected to the cone, and the outer fixing portion is connected to the shell; And / or, the distance between the bracket and the mounting portion is 1 mm to 2 mm; And / or, the skeletons of the first voice coil and the second voice coil are provided with a first through hole, the bracket is provided with a second through hole, and the fixing portion is provided with a third through hole; And / or, the inner wall of the shell is provided with two support platforms, the two support platforms are arranged on opposite sides of the fixing portion, and the periphery of each of the centering support plates is connected to one of the support platforms.

14. A terminal device, characterized in that: The device comprises a device body and a sound-generating device as claimed in any one of claims 1 to 13, wherein the sound-generating device is connected to the device body.

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