Sound production device and terminal device

Abstract

The application discloses a sound production device and a terminal device, the sound production device comprising a shell, a vibration system and a magnetic circuit system, the first vibration component of the vibration system 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 being connected to two ends of the shell respectively and covering an opening, the first voice coil being a rectangular voice coil, the second voice coil being a racetrack-shaped voice coil, the magnetic circuit system being arranged in a cavity of the shell, the magnetic circuit system being provided with a first magnetic gap and a second magnetic gap, the second magnetic gap being arranged around the first magnetic gap, at least part of the first magnetic gap being in communication with the second magnetic gap, one end of the first voice coil being suspended in the first magnetic gap, and one end of the second voice coil being suspended in the second magnetic gap. The sound production device can reduce the height and weight in the Z direction and reduce the shell vibration caused by the vibration system.

Description

Technical Field

[0001] This invention relates to the field of electroacoustic transduction technology, and in particular to a sound-generating device and a terminal device using the sound-generating device. Background Technology

[0002] With the rapid development of technology, audio devices are becoming increasingly popular. People's requirements for audio devices are no longer limited to video and audio playback; they also place greater emphasis on the reliability of audio devices. In particular, with the advent of the 5G era and the development of mobile multimedia technology, many audio devices now have multiple entertainment functions, such as video playback, digital photography, gaming, and GPS navigation. All of these require the electronic components within audio devices to become increasingly precise and compact.

[0003] In terminal devices, loudspeakers are commonly used electronic components, primarily for playing audio signals. In related technologies, loudspeakers generally employ a single-sided vibration system, and the low-frequency vibrations of a single-sided loudspeaker can affect system function. Dual-sided loudspeakers, on the other hand, suffer from more complex magnetic circuit system fixing and significantly different, less compact, designs for the two voice coils, resulting in low utilization of the magnetic circuit system, reduced vibration driving force, and decreased loudspeaker sensitivity. Furthermore, they increase the loudspeaker's height and weight in the Z-axis, making it impossible to achieve a thinner, lighter design. Summary of the Invention

[0004] The main objective of this invention is to provide a sound-generating device and a terminal device, which aims to provide a sound-generating device that effectively improves driving force and sensitivity. This sound-generating device not only reduces the effective diameter difference between the two voice coils and makes full use of the space between the two voice coils, making 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-generating device in the Z direction, thereby reducing the shell vibration caused by the vibration system.

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

[0006] A housing having cavities open at both ends;

[0007] A 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 being respectively connected to both ends of the housing and covering the opening, the first voice coil being a rectangular voice coil, and the second voice coil being a racetrack-shaped voice coil; and

[0008] A magnetic circuit system is provided between the first diaphragm assembly and the second diaphragm assembly. The magnetic circuit system has 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 in communication with 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.

[0009] In one embodiment, the housing further includes a mounting cavity located within the cavity, and the magnetic circuit system includes:

[0010] The external magnetic circuit portion is disposed within the mounting cavity, and the external magnetic circuit portion forms an accommodating cavity;

[0011] A connector, disposed within the accommodating cavity, includes a first connecting portion and two second connecting portions, the two second connecting portions being respectively connected to both ends of the first connecting portion and connected to the external magnetic circuit portion; and

[0012] The central magnetic circuit portion is disposed within the accommodating cavity and is fixedly connected to the first connecting portion.

[0013] Wherein, one end of the central magnetic circuit portion and the outer side of the two second connecting portions cooperate with one end of the outer magnetic circuit portion to form the second magnetic gap, and the other end of the central magnetic circuit portion and the other end of the outer magnetic circuit portion and the inner side of the two second connecting portions enclose to form the first magnetic gap.

[0014] 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-shaped segments connected end to end;

[0015] Each of the second connecting portions is located between a short axis segment and an arc segment to separate the first magnetic gap and the second magnetic gap, wherein the portion of the first magnetic gap corresponding to the long axis segment and the portion of the second magnetic gap corresponding to the long side segment are connected.

[0016] In one embodiment, the first connecting portion and the two second connecting portions enclose and form a placement groove;

[0017] The central magnetic circuit portion includes a first washer, a first magnet, a second washer, a second magnet, and a third washer stacked together. The first connecting portion is disposed 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 apart from the second connecting portion 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.

[0018] 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 that extends through the second washer along the direction of the long axis segment. The first connecting portion is disposed within the fixing groove.

[0019] In one embodiment, the side of the first connecting portion facing the second magnet is flush with the second surface;

[0020] And / or, the width of the fixing groove along the short axis is greater than the depth of the fixing groove along the axial direction of the second magnetic gap;

[0021] And / or, the width of the fixing groove along the short axis section is 2mm to 3.5mm;

[0022] And / or, the depth of the fixing groove along the axial direction of the second magnetic gap is 1.5mm to 2.5mm;

[0023] 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;

[0024] And / or, the distance between the long axis segment and the long side segment is 0.8mm to 1.5mm;

[0025] And / or, the length of the major axis segment is equivalent to the length of the major side segment;

[0026] And / or, the connector is made of a non-magnetic material.

[0027] In one embodiment, the thickness of the first magnet is greater than the thickness of the second magnet;

[0028] And / or, the ratio of the thickness of the first magnet to the thickness of the second magnet is 1:1 to 2:1;

[0029] And / or, the first magnet and the second magnet are magnetized in the same direction;

[0030] And / or, the thickness of the first washer is greater than the thickness of the third washer;

[0031] And / or, the thickness of the first washer is less than the thickness of the second washer;

[0032] And / or, the thickness of the third washer is less than the thickness of the second washer;

[0033] And / or, the second washer has a protruding edge on the periphery adjacent to the second surface, such that the width of the first surface along the short axis is smaller than the width of the second surface along the short axis.

[0034] And / or, the first surface is rectangular, and the outline of the first washer and the outline of the first magnet are the same as the first surface.

[0035] In one embodiment, the outer magnetic circuit portion is a U-shaped iron with open ends to form the accommodating cavity. One end of the U-shaped iron is bent and extended toward the accommodating cavity to form a bent portion. The bent portion is connected to the second connecting portion. The inner sides of the bent portion and the second connecting portion are spaced apart from one end of the central magnetic circuit portion to form the first magnetic gap.

[0036] In one embodiment, the bent portion encloses a rectangular opening, and the end of the U-shaped iron away from the bent portion forms a racetrack-shaped opening;

[0037] And / or, each of the second connecting portions is provided with a positioning post, and the bent portion is provided with a positioning hole corresponding to each of the positioning posts, with the positioning post passing through the positioning hole;

[0038] And / or, each of the second connecting portions has a first arcuate sidewall, a stepped surface and a second arcuate sidewall connected in sequence on the side facing the inner wall of the accommodating cavity, the second arcuate sidewall abutting against the inner wall of the accommodating cavity, and the first arcuate sidewall being spaced from the inner wall of the accommodating cavity to cooperate in forming the second magnetic gap.

[0039] And / or, the outer wall of the U-shaped iron is provided with a boss, the boss extends toward the side away from the receiving cavity, the U-shaped iron is disposed in the mounting cavity, and the boss is limited and abutted against the end face of one end of the mounting cavity;

[0040] And / or, the U-shaped iron is welded to the cavity wall of the mounting cavity; or, the U-shaped iron is bonded to the cavity wall of the mounting cavity.

[0041] In one embodiment, both the first diaphragm assembly and the second diaphragm assembly include a cone and a diaphragm disposed around the cone, the periphery of the diaphragm being connected to the housing, and one end of the first voice coil or the second voice coil being connected to the cone.

[0042] In one embodiment, the first vibration assembly and the second vibration assembly further include a support and a centering support plate. The support 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 support, and the other end of the centering support plate is connected to the housing.

[0043] In one embodiment, the housing includes:

[0044] The outer casing is a cylindrical structure with openings at both ends, and the outer casing has the cavity;

[0045] The mounting part has a mounting cavity and is located within the cavity; and

[0046] A fixing part is provided inside the cavity and connects the outer shell and the mounting part.

[0047] In one embodiment, the centering support is a spring wave structure;

[0048] And / or, the two centering supports are located on opposite sides of the fixing part and are symmetrically arranged with respect to the fixing part;

[0049] And / or, the two brackets are located on opposite sides of the fixing part and are arranged symmetrically with respect to the fixing part;

[0050] And / or, the two diaphragms are located on opposite sides of the fixing part and are arranged symmetrically with respect to the fixing part;

[0051] And / or, each of the diaphragms includes an inner fixing part, a folded ring part, and an outer fixing part connected in sequence, wherein the inner fixing part is connected to the cone, and the outer fixing part is connected to the housing;

[0052] And / or, the distance between the bracket and the mounting part is 1mm to 2mm;

[0053] 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 part is provided with a third through hole;

[0054] And / or, the inner wall of the outer shell is provided with two support platforms, the two support platforms are located on opposite sides of the fixing part, and the periphery of each centering support piece is connected to one of the support platforms.

[0055] The present invention also proposes a terminal device, including a device body and the aforementioned sound-emitting device, wherein the sound-emitting device is connected to the device body.

[0056] The sound-generating device of this invention facilitates the installation, fixation, and support of the vibration system and magnetic circuit system by setting the housing as a cavity structure with openings at both ends. The vibration system is configured as a first vibration assembly and a second vibration assembly, with the first diaphragm assembly of the first vibration assembly and the second diaphragm assembly of the second vibration assembly respectively connected to the two ends of the housing and covering the openings, thus forming a vibration space between the first and second diaphragm assemblies and enabling the sound-generating device to have a dual-sided sound-generating function. Simultaneously, the first voice coil is set as a rectangular voice coil, and the second voice coil is set as a racetrack-shaped voice coil. The magnetic circuit system is located between the first and second diaphragm assemblies. The vibration space between components, and the magnetic circuit system is provided with a first magnetic gap and a second magnetic gap, such that the second magnetic gap is arranged around the first magnetic gap, and at least part of the first magnetic gap is connected to 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. This cleverly makes full use of the space of the racetrack-shaped voice coil and the rectangular voice coil, reduces the effective diameter difference between the two voice coils, makes it easier to match the weight, improves the utilization rate of the magnetic circuit system, effectively increases the driving force, effectively improves the sensitivity, and reduces the height and weight of the sound-generating device in the Z direction, and reduces the shell vibration caused by the vibration system. Attached Figure Description

[0057] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0058] Figure 1 This is a schematic diagram of the structure of a sound-generating device in one embodiment of the present invention;

[0059] Figure 2 This is a cross-sectional view of the sound-generating device along its long axis in one embodiment of the present invention;

[0060] Figure 3 This is a cross-sectional view of the sound-generating device along its minor axis in one embodiment of the present invention;

[0061] Figure 4 This is an exploded view of the sound-generating device without its housing in one embodiment of the present invention;

[0062] Figure 5 This is a top view schematic diagram of the cooperation between the first voice coil and the second voice coil in one embodiment of the present invention;

[0063] Figure 6 This is an exploded view of the connector and external magnetic circuit portion in one embodiment of the present invention;

[0064] Figure 7 This is a schematic diagram of the structure of the connector and the second washer in one embodiment of the present invention;

[0065] Figure 8 This is a schematic diagram of the structure of the second washer in one embodiment of the present invention.

[0066] Explanation of icon numbers:

[0067]

[0068]

[0069] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0070] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0071] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0072] Meanwhile, the meaning of "and / or" or "and / or" appearing throughout the text is that it includes three options. Taking "A and / or B" as an example, it includes option A, option B, or an option that satisfies both A and B.

[0073] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0074] With the rapid development of technology, audio devices are becoming increasingly popular. People's requirements for audio devices are no longer limited to video and audio playback; they also place greater emphasis on the reliability of audio devices. In particular, with the advent of the 5G era and the development of mobile multimedia technology, many audio devices now have multiple entertainment functions, such as video playback, digital photography, gaming, and GPS navigation. All of these require the electronic components within audio devices to become increasingly precise and compact.

[0075] In terminal devices, loudspeakers are commonly used electronic components, primarily for playing audio signals. In related technologies, loudspeakers generally employ a single-sided vibration system, and the low-frequency vibrations of single-sided loudspeakers affect system function. In contrast, the simple magnetic circuit and voice coil designs of dual-sided loudspeakers, due to their lack of compactness, cannot reduce the overall height of the loudspeaker. Furthermore, the significant differences in the design of the two voice coils, resulting in insufficient compactness, makes it difficult to match vibrational mass and affects the BL value. Complex magnetic circuit and voice coil designs, due to insufficient stability of the central magnetic circuit and the lack of stable structural support between it and the outer magnetic circuit, easily cause the central magnetic circuit to attract and adhere to the outer magnetic circuit. Moreover, the complex fixing of the magnetic circuit system and the significant differences in the design of the two voice coils, resulting in insufficient compactness, lead to low utilization of the magnetic circuit system, reduced vibration driving force, and decreased loudspeaker sensitivity. Additionally, it increases the height and weight of the loudspeaker in the Z-axis, making it impossible to achieve a slim and lightweight design.

[0076] Based on the above concepts and problems, this invention proposes a sound-generating device 100. It is understood that the sound-generating device 100 is applied to electronic devices or terminal devices. Electronic devices can be headphones, VR devices, AR devices, Glass devices, etc., and are not limited thereto. Terminal devices can be vehicles, etc., and are not limited thereto.

[0077] In this embodiment, the sound-generating device 100 is configured as a double-sided sound-generating structure, with a diaphragm structure on each side vibrating to generate sound. This reduces additional vibration from the speaker while saving space and ensuring sufficient sensitivity. Based on the spatial layout characteristics of the components of a double-sided speaker, and combining the double-column concealed beam construction and gantry structure from engineering mechanics, the sound-generating device 100 of this application is designed as a novel double-sided speaker structure. The internal magnetic circuit and U-shaped iron are connected by a crossbeam structure, resulting in a lightweight and compact design. The top and bottom surfaces of this double-sided sound-generating structure are both rectangular.

[0078] Understandably, the sound-generating device 100 employs a double-sided diaphragm and dual voice coils, sharing a single magnetic circuit system. This not only improves the driving force and sensitivity but also increases the utilization rate of the magnetic circuit system 3, thereby increasing the driving force and the vibration space of the vibration system 2. This effectively enhances sensitivity and reduces the height and weight of the sound-generating device 100 in the Z-direction, thus reducing the vibration of the device housing. Furthermore, the sound-generating device 100 of this application features a more compact design for the magnetic circuit system 3 and vibration system 2, allowing for convenient installation in environments such as car doors or similar barriers.

[0079] Please refer to the reference. Figures 1 to 8 As shown, in this embodiment of the invention, the sound-generating device 100 includes a housing 1, a vibration system 2, and a magnetic circuit system 3. The housing 1 has 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 voice coil 212 is rectangular and the second voice coil 222 is racetrack-shaped. The magnetic circuit system 3 is located between the first diaphragm assembly 211 and the second diaphragm assembly 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.

[0080] In this embodiment, the housing 1 of the sound-generating device 100 is used to install, fix, and protect components such as the vibration system 2 and the magnetic circuit system 3. That is, the housing 1 provides an installation base for components such as the vibration system 2 and the magnetic circuit system 3. It can be understood that the housing 1 can be a structure such as a mounting shell, fixing shell, mounting box, box, cylinder, or frame with a cavity 111.

[0081] Understandably, the housing 1 can be a one-piece structure, which improves its structural strength and sealing performance. For example, the housing 1 may be a cylindrical structure with openings at both ends, and a cavity 111 may be formed inside the housing 1. Of course, in other embodiments, the housing 1 may also be a split structure, for example, the housing 1 may include a basin frame, a first end cap, and a second end cap, which are respectively connected to both sides of the basin frame and enclose the cavity 111, etc., without limitation. It should be noted that the first end cap and the second end cap of the housing 1 may be a flat plate structure, a U-shaped groove structure, or both the first end cap and the second end cap may be U-shaped groove structures, without limitation.

[0082] In this embodiment, the vibration system 2 is configured as a first vibration component 21 and a second vibration component 22, which are respectively connected to the two ends of the housing 1 and cover the openings at both ends of the cavity 111, thereby forming a rear acoustic cavity 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 configured to correspond to the two sound outlets.

[0083] Understandably, placing the magnetic circuit system 3 inside the rear acoustic cavity, that is, the magnetic circuit system 3 is located between the first vibration component 21 and the second vibration component 22, allows the first vibration component 21 and the second vibration component 22 to share a single magnetic circuit system 3, effectively improving the utilization rate of the magnetic field. At the same time, the movement of the first vibration component 21 and the second vibration component 22 towards or away from each other can reduce the vibration of the housing during the operation of the sound-generating device.

[0084] Of course, in other embodiments, the side of the first vibration component 21 facing away from the rear acoustic cavity encloses the housing 1 to form a front acoustic cavity, and the side of the second vibration component 22 facing away from the rear acoustic cavity encloses the housing 1 to form a front acoustic cavity. It is understood that the two front acoustic cavities of the sound-generating device 100 can be interconnected or independent of each other. The front acoustic cavity and the rear acoustic cavity are two independent cavities and are not interconnected. One or two front acoustic holes may also be provided on the housing 1. Optionally, the two front acoustic cavities of the sound-generating device 100 are independent of each other. There are two front acoustic holes, each connected to one front acoustic cavity; this is not limited here.

[0085] It should be noted that the two front sound holes can be located on the same side or different sides of the housing 1. Optionally, the two front sound holes can be located on the same side of the housing 1. Of course, in order to maintain the air pressure balance in the rear sound cavity, the housing 1 is also provided with a rear sound hole that connects the rear sound cavity to the outside. Understandably, the two front sound holes and the rear sound hole are located on different sides of the housing 1. In this way, when the sound generating device 100 is installed on the door of the vehicle body, the front sound holes can easily emit sound towards the inside of the vehicle, and the rear sound hole can connect with the space inside the door, so as to effectively ensure the air pressure balance in the front and rear sound cavities, thereby ensuring the sound generation effect of the sound generating device 100.

[0086] Of course, in other embodiments, when the sound-generating device 100 is applied to 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 reduction. Optionally, the two front sound holes and the rear sound hole are located on opposite sides of the housing 1 and form a dipole effect, which can achieve far-field noise reduction of the sound-generating device 100 and improve the user experience of the sound-generating device 100. This is not limited here.

[0087] Optionally, the two front sound holes and the rear sound hole are located on opposite sides of the housing 1. 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, so as to form a dipole effect, thereby achieving noise reduction of the sound generating device 100 in the rear sound cavity and improving the user experience of the sound generating device 100.

[0088] 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 racetrack-shaped voice coil. 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 disposed in the magnetic circuit system 3 corresponding to the first voice coil 212 and the second voice coil 222, such that the second magnetic gap 32 is disposed around the first magnetic gap 31, and at least part of the first magnetic gap 31 is connected to the second magnetic gap 32. This allows one end of the first voice coil 212 to be suspended in the first magnetic gap 31, and one end of the second voice coil 222 to be suspended in the second magnetic gap 32.

[0089] Understandably, the first voice coil 212 is a rectangular voice coil, and the shape and outline of the first magnetic gap 31 are similar to or comparable to the shape and outline 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 outline of the second magnetic gap 32 are similar to or comparable to the shape and outline 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 racetrack-shaped voice coil, the effective diameter difference between the two voice coils can be reduced by utilizing their structural characteristics, making it easier to match the weight. Furthermore, the spatial arrangement of the first and second voice coils 212 and 222 effectively reduces weight and volume, improving the utilization rate of the magnetic circuit system 3, increasing the driving force, and increasing the vibration space of the vibration system 2, thus improving sensitivity. It also reduces the height and weight of the sound-generating device 100 in the Z-direction, reducing vibration of the housing 1 caused by the vibration system 2, and ensuring that both the top and bottom surfaces of the double-sided sound-generating device 100 are rectangular in overall appearance. Figure 1 As shown.

[0090] The sound-generating device 100 of the present invention facilitates the installation, fixation, and support of the vibration system 2 and the magnetic circuit system 3 by configuring the housing 1 as a cavity 111 with openings at both ends. The vibration system 2 is configured as a first vibration component 21 and a second vibration component 22, with the first diaphragm component 211 of the first vibration component 21 and the second diaphragm component 221 of the second vibration component 22 respectively connected to both ends of the housing 1 and covering the openings, thus forming a vibration space between the first diaphragm component 211 and the second diaphragm component 221, and giving the sound-generating device 100 a dual-sided sound-generating function. Simultaneously, the first voice coil 212 is configured as a rectangular voice coil, and the second voice coil 222 is configured as a racetrack-shaped voice coil. The magnetic circuit system 3 is positioned between the first diaphragm component 211 and the second diaphragm component 221. The vibration space between the second diaphragm assemblies 221 and the magnetic circuit system 3 are provided with a first magnetic gap 31 and a second magnetic gap 32, such 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. This cleverly makes full use of the space of the racetrack-shaped voice coil and the rectangular voice coil, reduces the effective diameter difference between the two voice coils, makes it easier to match the weight, improves the utilization rate of the magnetic circuit system 3, effectively increases the driving force, effectively improves the sensitivity, and reduces the height and weight of the sound-generating device 100 in the Z direction, and reduces the vibration of the housing 1 caused by the vibration system 2.

[0091] In one embodiment, the housing 1 further includes an installation cavity located within the cavity 111. The magnetic circuit system 3 includes an outer magnetic circuit portion 33, a connector 34, and a central magnetic circuit portion 35. The outer magnetic circuit portion 33 is located within the installation cavity and forms a receiving cavity 332. The connector 34 is located within the receiving cavity 332 and includes a first connecting portion 341 and two second connecting portions 342. The two second connecting portions 342 are respectively connected to both ends of the first connecting portion 341 and connected to the outer magnetic circuit portion 33. The central magnetic circuit portion 35 is located within the receiving cavity 332 and is fixedly connected to the first connecting portion 341. One end of the central magnetic circuit portion 35 and the outer sides of the two second connecting portions 342 cooperate with one end of the outer magnetic circuit portion 33 to form a second magnetic gap 32. The other end of the central magnetic circuit portion 35, the other end of the outer magnetic circuit portion 33, and the inner sides of the two second connecting portions 342 enclose to form a first magnetic gap 31.

[0092] In this embodiment, as Figures 2 to 8As shown, the second magnetic gap 32 of the magnetic circuit system 3 is arranged around the first magnetic gap 31, and at least a portion of the first magnetic gap 31 is in communication with the second magnetic gap 32. It is understood that, to facilitate the installation and fixing of the magnetic circuit system 3, an installation cavity is provided within the cavity 111 of the housing 1, thereby facilitating the installation, fixing, and support of the magnetic circuit system 3 using the installation cavity. Optionally, the installation cavity can be a through-cavity structure with openings at both ends.

[0093] To facilitate the sharing of a magnetic circuit system 3 between the first voice coil 212 of the first vibrating component 21 and the second voice coil 222 of the second vibrating component 22. How to 2 to Figure 8 As shown, in this embodiment, the magnetic circuit system 3 is configured as an outer magnetic circuit part 33, a connector 34, and a central magnetic circuit part 35. The outer magnetic circuit part 33 is disposed in the mounting cavity, and a receiving cavity 332 is formed in the outer magnetic circuit part 33. The central magnetic circuit part 35 is installed and fixed to the connector 34, thereby connecting the connector 34 to the outer magnetic circuit part 33, so that the connector 34 and the central magnetic circuit part 35 are located in the receiving cavity 332 in the outer magnetic circuit part 33.

[0094] Understandably, by configuring the connector 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 connector 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. This allows one end of the central magnetic circuit part 35 and the outer sides of the two second connecting parts 342 to mate with one end of the outer magnetic circuit part 33 to form a second magnetic gap 32. The other end of the central magnetic circuit part 35, the other end of the outer magnetic circuit part 33, and the inner sides of the two second connecting parts 342 enclose to form a first magnetic gap 31. That is, in the direction of voice coil vibration, the rectangular first voice coil 212 is located within the racetrack-shaped second voice coil 222. Figure 5 As shown.

[0095] Optionally, the two second connecting portions 342 of the connector 34 are symmetrically arranged. In this embodiment, the first voice coil 212 and the second voice coil 222 of the first vibration assembly 21 / second vibration assembly 22 are located in the rear acoustic cavity. By connecting one end of the first voice coil 212 to the first vibration assembly 21 and suspending the other end of the first voice coil 212 in the first magnetic gap 31, and connecting one end of the second voice coil 222 to the second vibration assembly 22 and suspending the other end of the second voice coil 222 in the second magnetic gap 32, the second magnetic gap 32 is arranged around the first magnetic gap 31. This avoids interference between the first voice coil 212 and the second voice coil 222 during vibration, and ensures smooth airflow between the first voice coil 212 and the second voice coil 222 during vibration by utilizing at least a portion of the first magnetic gap 31 and the second magnetic gap 32, thus avoiding affecting the vibration effect of the first voice coil 212 and the second voice coil 222. Optionally, the first diaphragm assembly 211 and the second diaphragm assembly 221 are symmetrically arranged with respect to the magnetic circuit system 3.

[0096] It is understood that the outer magnetic circuit portion 33 can be a single integral structure, such as a ring-shaped structure; the outer magnetic circuit portion 33 can also be formed by multiple separate structures working together, for example, multiple outer magnetic circuit portions 33 are arranged at intervals and around the periphery of the central magnetic circuit portion 35, which is not limited here. In this embodiment, the central magnetic circuit portion 35 and the first connecting portion 341 can be fixedly connected by means of bonding or welding, which is not limited here.

[0097] 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-shaped segments 2222 connected end to end; each second connecting portion 342 is located between a short axis segment 2122 and an arc-shaped 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 connected to the portion of the second magnetic gap 32 corresponding to the long side segment 2221.

[0098] In this embodiment, as Figure 4 and Figure 5 As shown, the first voice coil 212, arranged in a directional configuration, 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-shaped segments 2222 connected end-to-end. It can be understood that the long axis segments 2121 of the first voice coil 212 correspond to the long side segments 2221 of the second voice coil 222, and the short axis segments 2122 of the first voice coil 212 correspond to the arc-shaped segments 2222 of the second voice coil 222.

[0099] It should be noted that the diameter of the arcuate segment 2222 of the second voice coil 222 (that is, 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 protrudes 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 connector 34.

[0100] In this embodiment, each second connecting portion 342 of the connector 34 is located between a short axis segment 2122 and an arc-shaped segment 2222. The connector 34 thus separates the first magnetic gap 31 and the second magnetic gap 32, with the portion of the first magnetic gap 31 corresponding to the long axis segment 2121 and the portion of the second magnetic gap 32 corresponding to the long side segment 2221 corresponding to the long side segment 2221 connected. That is, one side of the first magnetic gap 31 corresponding to the short axis segment 2122 is separated from one side of the second magnetic gap 32 corresponding to the arc-shaped segment 2222 by the second connecting portion 342, while one side of the first magnetic gap 31 corresponding to the long axis segment 2121 is connected to one side of the second magnetic gap 32 corresponding to the long side segment 2221, without any structural or obstructive separation.

[0101] 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. This arrangement can reduce the difference 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 that the first voice coil 212 and the second voice coil 222 vibrate in phase (i.e., vibrate outward or inward at the same time), thereby driving the first diaphragm assembly 211 and the second diaphragm assembly 221 to produce sound in phase.

[0102] 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 0.8mm to 1.5mm. This setting can effectively prevent the two voice coils from rubbing against each other and minimize the difference 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.

[0103] Understandably, the distance between the major 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 major axis segment 2121 and the long side segment 2221 located on the same side. Optionally, the distance between the major axis segment 2121 of the first voice coil 212 and the long side segment 2221 of the second voice coil 222 can be 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, etc., and is not limited here.

[0104] In this embodiment, by setting the two second connecting portions 342 of the connector 34 into a symmetrical structure, a stable installation can be achieved by connecting the two second connecting portions 342 of the connector 34 to the outer magnetic circuit portion 33 of the magnetic circuit system 3, and a stable installation can also be achieved by using the first connecting portion 341 of the connector 34 to the central magnetic circuit portion 35. This improves the balance of the sound-generating device 100 and enhances the sound-generating effect. Optionally, the connector 34 is located at the middle position of the outer magnetic circuit portion 33 and the middle position of the central magnetic circuit portion 35 of the magnetic circuit system 3. It is understood that, in order to improve the connection stability, the connector 34 can be connected to the outer magnetic circuit portion 33 and the central magnetic circuit portion 35 by means of adhesive or welding, etc., which is not limited here.

[0105] In one embodiment, the first connecting portion 341 and the two second connecting portions 342 enclose 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 stacked together. The first connecting portion 341 is disposed 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 apart from the second connecting portions 342 to form a first magnetic gap 31. The second magnet 354 and the third washer 355 are located outside the placement groove 343 and are engaged with one end of the outer magnetic circuit portion 33 to form a second magnetic gap 32.

[0106] In this embodiment, as Figures 2 to 8 As shown, the first washer 351, the first magnet 352, the second washer 353, the second magnet 354, and the third washer 355 of the central magnetic circuit portion 35 are plate-shaped and stacked. The central magnetic circuit portion 35 is fixedly connected to the outer magnetic circuit portion 33 by the connector 34, which not only realizes the fixed installation of the central magnetic circuit portion 35, but also increases the thickness of the first magnet 352 and the second magnet 354 in the central magnetic circuit portion 35, thereby increasing the magnetic field utilization rate to provide driving force for the first voice coil 212 and the second voice coil 222.

[0107] Understandably, by placing a portion of the central magnetic circuit portion 35 within the placement groove 343 of the connector 34, and placing a portion of the central magnetic circuit portion 35 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. This allows the first washer 351, the first magnet 352, and the second washer 353 of the central magnetic circuit portion 35 to cooperate with the second connecting portion 342 to form a first magnetic gap 31, and the second magnet 354 and the third washer 355 of the central magnetic circuit portion 35 to cooperate with one end of the outer magnetic circuit portion 33 to form a second magnetic gap 32. This achieves both installation and fixation, effectively increasing the magnet thickness in a sound-generating device 100 of the same size to improve magnetic field utilization and provide driving force for the first voice coil 212 and the second voice coil 222; and reducing the height of the sound-generating device 100 in the Z-direction while maintaining the same magnet thickness. Of course, in a 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.

[0108] 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. The fixing groove 3533 extends 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.

[0109] In this embodiment, as Figures 2 to 4 , Figure 7 and Figure 8 As shown, a fixing groove 3533 is formed in the second surface 3532 of the second washer 353, thereby connecting and fixing it 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 the two second connecting portions 342 of the connector 34 to provide installation and support for the second magnet 354 and the third washer 355, further improving installation stability. It is understood that the first connecting portion 341 is fixedly installed in the fixing groove 3533 of the second washer 353 by adhesive bonding, which is not limited here.

[0110] 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, which can effectively increase the contact area between the second magnet 354 and the second surface 3532 of the second washer 353, the first connecting portion 341 of the connector 34 and the two second connecting portions 342, thereby improving stability.

[0111] Understandably, the width of the fixing groove 3533 along the short axis segment 2122 is greater than the depth of the fixing groove 3533 along the axial direction of the second magnetic gap 32. This arrangement effectively improves the connection stability between the first connecting part 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, that is, the fixing groove 3533 does not penetrate the second washer 353 in the vibration direction of the voice coil. In this way, the fixing groove 3533 can be used to fix the first connecting part 341, and the second magnet 354 can be used to cooperate with the second surface 3532 of the second washer 353, the first connecting part 341 of the connector 34, and the connection of the two second connecting parts 342 to improve the connection stability between the first connecting part 341 and the central magnetic circuit part 35.

[0112] Optionally, the width of the fixing groove 3533 along the direction of the short axis segment 2122 is 2mm to 3.5mm. In this embodiment, the width of the fixing groove 3533 along the direction of the short axis segment 2122 can be selected as 2mm, 2.3mm, 2.5mm, 2.8mm, 3mm, 3.3mm, 3.5mm, etc., and is not limited here. Optionally, the depth of the fixing groove 3533 along the axial direction of the second magnetic gap 32 is 1.5mm to 2.5mm. In this embodiment, the depth of the fixing groove 3533 along the axial direction of the second magnetic gap 32 can be selected as 1.5mm, 1.8mm, 2mm, 2.3mm, 2.5mm, etc., and is not limited here.

[0113] 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 direction of the short axis segment 2122 is smaller than the width of the second connecting portion 342 along the direction of the short axis segment 2122. This allows for proper positioning and bonding, and the smaller first connecting portion 341 reduces BL loss.

[0114] Understandably, the periphery of the second surface 3532 of the second washer 353 cooperates with the two second connecting parts 342 to form a racetrack-shaped structure, so that it 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 are 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.

[0115] 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, etc., and is not limited thereto. Optionally, the first washer 351, the second washer 353, and the third washer 355 may be magnetically conductive plate structures. The first magnet 352 and the second magnet 354 may be permanent magnets.

[0116] In one embodiment, the thickness of the first magnet 352 is greater than the thickness of the second magnet 354. It is understood 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.

[0117] Understandable, such as Figure 2 and Figure 3 As shown, by making the thickness of the first magnet 352 greater than the thickness of the second magnet 354, and by making the ratio of the thickness of the first magnet 352 to the thickness of the second magnet 354 1:1, 1.5:1, 2:1, etc., the symmetry of the BL curve can be effectively improved and the distortion reduced.

[0118] In this embodiment, the thickness of the first washer 351 is greater than the thickness of the third washer 355. The thickness of the first washer 351 is less than the thickness of the second washer 353. The thickness of the third washer 355 is less than the thickness of the second washer 353. It is understood 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 can be effectively aligned, facilitating assembly.

[0119] In one embodiment, the second washer 353 has a protruding edge 3534 protruding from the periphery of the second surface 3532, such that the width of the first surface 3531 along the short axis segment 2122 is smaller than the width of the second surface 3532 along the short axis segment 2122.

[0120] In this embodiment, as Figure 3 , Figure 4 , Figure 7 and Figure 8 As shown, by providing a protruding edge 3534 on the periphery of the second washer 353 adjacent to the second surface 3532, the second surface 3532 extends to the protruding edge 3534, thereby ensuring that the periphery of the protruding edge 3534 matches the periphery of the second connecting portion 342 to form a racetrack-shaped structure. It can be understood that the shape and size of the first surface 3531 of the second washer 353 are adapted to the shape and size of the first washer 351 and the first magnet 352, so that the periphery 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.

[0121] To accommodate the rectangular first voice coil 212, the first surface 3531 of the first washer 351, the first magnet 352, and the second washer 353 are rectangularly shaped. Optionally, the first surface 3531 is rectangular, and the outlines of the first washer 351 and the first magnet 352 are the same as the first surface 3531, thus providing magnetic lines of force for the first voice coil 212. To accommodate the racetrack-shaped second voice coil 222, the second magnet 354, the third washer 355, and the second surface 3532 of the second washer 353 are arranged in a racetrack shape in conjunction with the second connecting portion 342, thus providing magnetic lines of force for the second voice coil 222. By utilizing the first magnetic gap 31 and the second magnetic gap 32 to provide suspension space for the first voice coil 212 and the second voice coil 222 respectively, interference or collision problems between the first voice coil 212 and the second voice coil 222 during vibration are effectively avoided, and it also helps to reduce the height of the sound-generating device 100 in the Z direction.

[0122] In one embodiment, the outer magnetic circuit portion 33 is a U-shaped iron 331, which has a cylindrical structure with openings at both ends to form a receiving cavity 332. One end of the U-shaped iron 331 is bent and extended toward the receiving cavity 332 to form a bent portion 333. The bent portion 333 is connected to the second connecting portion 342. The inner sides of the bent portion 333 and the second connecting portion 342 are spaced apart from one end of the central magnetic circuit portion 35 to form a first magnetic gap 31.

[0123] In this embodiment, as Figures 2 to 4 , Figure 6 As shown, the external magnetic circuit portion 33 can be selected as a U-shaped iron 331, which has a cylindrical structure with openings at both ends and forms a receiving cavity 332. Optionally, a boss 335 is provided on the outer wall of the U-shaped iron 331, which extends toward the side opposite to the receiving cavity 332. The U-shaped iron 331 is disposed in the mounting cavity, and the boss 335 is limited and abutted against the end face of one end of the mounting cavity.

[0124] Understandably, the U-shaped iron 331 has a protruding boss 335 at one end adjacent to the third washer 355. The boss 335 extends towards the side opposite to the receiving cavity 332. The U-shaped iron 331 is disposed within the mounting cavity, and the boss 335 abuts against the end face of one end of the mounting cavity. Understandably, this arrangement can effectively improve the installation stability of the external magnetic circuit portion 33. Optionally, the U-shaped iron 331 is welded to the cavity wall of the mounting cavity; or, the U-shaped iron 331 is bonded to the cavity wall of the mounting cavity. This can further improve the installation stability of the U-shaped iron 331.

[0125] In this embodiment, the U-shaped iron 331 is bent and extended towards the receiving cavity 332 to form a bent portion 333. Optionally, the bent portion 333 surrounds a rectangular opening, and the end of the U-shaped iron 331 away from the bent portion 333 forms a racetrack-shaped opening, thus adapting to the first voice coil 212 and the second voice coil 222. At the same time, the bent portion 333 is used to connect with the second connecting portion 342 to improve connection stability.

[0126] Understandably, 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, with the positioning post 344 passing through the positioning hole 334. In this embodiment, as... Figure 2 and Figure 6 As shown, the extension length of the short shaft segment 2122 corresponding to the bent portion 333 is greater than the extension length of the long shaft segment 2121 corresponding to the bent portion 333. Thus, by providing a positioning hole 334 in the part of the short shaft segment 2122 corresponding to the bent portion 333, positioning and installation can be provided by the positioning hole 334 and the positioning post 344 of the second connecting portion 342, and the part of the short shaft segment 2122 corresponding to the bent portion 333 can also provide a foundation for installation and support of the connecting piece 34 and the central magnetic circuit portion 35.

[0127] In one embodiment, each second connecting portion 342 has a first arcuate sidewall 345, a stepped surface 346 and a second arcuate sidewall 347 connected in sequence on the side facing the inner wall of the accommodating cavity 332. The second arcuate sidewall 347 abuts against the inner wall of the accommodating cavity 332, and the first arcuate sidewall 345 is spaced from the inner wall of the accommodating cavity 332 to cooperate in forming a second magnetic gap 32.

[0128] In this embodiment, as Figure 4 , Figure 6 and Figure 7 As shown, the end face of the second connecting portion 342 facing away from the first connecting portion 341 is arc-shaped. By forming a first arc-shaped sidewall 345, a stepped surface 346, and a second arc-shaped sidewall 347 sequentially connected on the side of the second connecting portion 342 facing the inner wall of the accommodating cavity 332, the second arc-shaped sidewall 347 can abut against the inner wall of the accommodating cavity 332 to achieve positioning and installation of the connecting member 34, and the first arc-shaped sidewall 345 is spaced from the inner wall of the accommodating cavity 332 to form a second magnetic gap 32, which provides vibration space for the second voice coil 222.

[0129] Understandably, in order to ensure that the first washer 351, the first magnet 352, and the second washer 353 are spaced apart from the inner side of the first surface 3531 and the second connecting portion 342 to form a 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 face of the second washer 353 abuts and limits the positioning platform so that the first washer 351, the first magnet 352, and the second washer 353 are spaced apart from the inner side of the first surface 3531 and the second connecting portion 342.

[0130] Optionally, the first connecting part 341 and the two second connecting parts 342 of the connector 34 cooperate to form a beam structure or a gantry structure, which can provide an installation and support foundation for the central magnetic circuit part 35, and can also be connected and fixed to the bent part 333 of the U-shaped iron 331 by utilizing the two second connecting parts 342 of the connector 34.

[0131] In one embodiment, both the first diaphragm assembly 211 and the second diaphragm assembly 221 include a cone 2111 and a diaphragm 2112 disposed around the cone 2111. The periphery of the diaphragm 2112 is connected to the housing 1, and one end of the first voice coil 212 or the second voice coil 222 is connected to the cone 2111.

[0132] In this embodiment, as Figures 1 to 4 As shown, the first vibration component 21 and the second vibration component 22 are symmetrically arranged with respect to the magnetic circuit system 3. It can be understood that by setting the first vibration component 21 and the second vibration component 22 as a symmetrical structure, the double-sided sound generation effect of the sound generating device 100 is further improved. This ensures that when the first vibration component 21 and the second vibration component 22 vibrate and generate sound, the sound is transmitted through the first diaphragm component 211 and the second diaphragm component 221, forming a superimposed sound generation effect, thereby improving the sound generation effect of the sound generating device 100.

[0133] Understandable, such as Figures 1 to 4 As shown, the cone 2111 of the first diaphragm assembly 211 and the cone 2111 of the second diaphragm assembly 221 are symmetrically arranged with respect to the rear acoustic cavity. Optionally, the cone 2111 is cone-shaped. The cones 2111 of the first diaphragm assembly 211 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 surrounds the cone 2111.

[0134] In this embodiment, the diaphragms 2112 of both the first diaphragm assembly 211 and the second diaphragm assembly 221 include an inner fixing part, a folded ring part, and an outer fixing part connected in sequence. The inner fixing part is connected to the cone 2111, and the outer fixing part is connected to the housing 1. In this embodiment, to facilitate the connection between the diaphragm 2112 and the cone 2111, the inner fixing part of the diaphragm 2112 is attached to one side of the cone 2111. Optionally, the two diaphragms 2112 are symmetrically arranged with respect to the magnetic circuit system 3.

[0135] In one embodiment, the first vibration assembly 21 and the second vibration assembly 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 housing 1.

[0136] In this embodiment, as Figures 2 to 4 As shown, by setting centering supports 214, one end of each centering support 214 is connected to the bracket 213, and the other end of the centering support 214 is connected to the housing 1. In this way, the centering supports 214 can effectively prevent polarization or oscillation of the cone 2111 when it vibrates with the first voice coil 212 / second voice coil 222. Optionally, the two centering supports 214 are spider structures.

[0137] Optionally, the centering support 214 has a ring 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 symmetrically arranged with respect to the magnetic circuit system 3. In this embodiment, the two centering supports 214 are arranged in parallel, but this is not limited.

[0138] In one embodiment, the housing 1 includes an outer shell 11, a mounting part 12, and a fixing part 13. The outer shell 11 has a cylindrical structure with openings at both ends and has a cavity 111. The mounting part 12 has a mounting cavity and is located inside the cavity 111. The fixing part 13 is located inside the cavity 111 and connects the outer shell 11 and the mounting part 12.

[0139] In this embodiment, as Figures 1 to 3 As shown, by making the outer shell 11 of the housing 1 into a cylindrical structure with openings at both ends, and by setting the mounting part 12 into a cylindrical structure with openings at both ends, the outer shell 11 is connected to the mounting part 12 through the fixing part 13. Of course, in other embodiments, the housing 1 may also include structures such as a first end cap and a second end cap, which are not limited here.

[0140] Understandably, the outer casing 11 is provided with a rear acoustic hole, the first end cap is connected to one end of the outer casing 11 and is opposite to and spaced apart from the mounting part 12, the first end cap and the outer casing 11 enclose to form a front acoustic hole, the second end cap is connected to the other end of the outer casing 11 and is opposite to and spaced apart from the mounting part 12, the second end cap and the outer casing 11 enclose to form a front acoustic hole; wherein, the first vibration component 21 is connected to the outer casing 11 and is opposite to and spaced apart from the mounting cavity, and the second vibration component 22 is connected to the outer casing 11 and is opposite to and spaced apart from the mounting cavity.

[0141] In this embodiment, by setting the housing 1 as a single-piece structure and cooperating to form a specific cavity 111, the structural strength of the housing 1 can be improved, and the assembly and disassembly of components such as the vibration system 2 and the magnetic circuit system 3 can be facilitated. It is understood that the mounting portion 12 of the housing 1 can be a cylindrical structure with openings at both ends. By placing the outer shell 11 outside the mounting portion 12, the housing 1 can be conveniently used to mount and fix the first diaphragm assembly 211 and the second diaphragm assembly 221 respectively, improving installation stability. Simultaneously, the fixing portion 13 connects the outer shell 11 and the mounting portion 12 into a single-piece structure, improving structural stability. Optionally, the outer shell 11, the fixing portion 13, and the mounting portion 12 are integrally formed structures.

[0142] Understandably, the housing 1 can be a plastic housing, which makes it easy to process; the housing 1 can also be a metal housing, which can both increase the volume of the sound cavity of the sound-generating device 100 and improve the heat dissipation effect; of course, the housing 1 can also be a structure that is integrally molded from plastic and metal, which is not limited here.

[0143] In one embodiment, such as Figure 2 and Figure 3 As shown, two centering supports 214 are located on opposite sides of the fixing part 13 and are symmetrically arranged relative to the fixing part 13. Two brackets 213 are located on opposite sides of the fixing part 13 and are symmetrically arranged relative to the fixing part 13. Two diaphragms 2112 are located on opposite sides of the fixing part 13 and are symmetrically arranged relative to the fixing part 13. Optionally, each diaphragm 2112 includes an inner fixing part, a folded ring part, and an outer fixing part connected in sequence. The inner fixing part is connected to the cone 2111, and the outer fixing part is connected to the housing 1.

[0144] Understandably, to prevent interference between the vibration of the bracket 213 and the mounting portion 12 when the first voice coil 212 / second voice coil 222 drives the first diaphragm assembly 211 / second diaphragm assembly 221 to vibrate, and consequently the bracket 213 and centering support 214, the distance between the bracket 213 and the mounting portion 12 is 1mm to 2mm in this embodiment. Optionally, the distance between the bracket 213 and the mounting portion 12 can be 1mm, 1.3mm, 1.5mm, 1.8mm, 2mm, etc., to ensure that the bracket 213 will not rub against the mounting portion 12 during vibration; this is not limited here.

[0145] In one embodiment, such as Figures 2 to 4 As shown, 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 part 13 is provided with a third through hole 131. This arrangement can ensure the airflow and real-time uniformity in the rear acoustic cavity.

[0146] To improve the connection stability between the centering support 214 and the housing 1, such as Figure 2 and Figure 3 As shown, the inner wall of the outer shell 11 is provided with two support platforms 112. The two support platforms 112 are located on opposite sides of the fixing part 13, and the periphery of each centering support piece 214 is connected to a support platform 112.

[0147] The sound-generating device 100 of this application features ultra-thinness and ultra-lightness. By adding a crossbeam-structured connector 34, the central magnetic circuit portion 35 and the U-shaped iron 331 are securely connected together. The second connecting portion 342 of the connector 34 cleverly utilizes the space between the short axes of the two voice coils, making full use of the space between the racetrack-shaped and rectangular voice coils. This reduces the effective diameter difference between the two voice coils, making it easier to match the weight. Simultaneously, the ingenious design of the first connecting portion 341 and the second connecting portion 342 of the connector 34 reduces the difficulty of magnetic circuit design, component manufacturing, and assembly processes in the double-sided sound-generating device 100, making it easier to manufacture and mass-produce. Furthermore, its stability makes it easier to pass reliability tests. Further, through the optimized design of the inverted cone and centering support, space is fully utilized, reducing the overall thickness of the sound-generating device 100. The magnetic circuit design and dual-voice coil structure design reduce the diameter difference between the two voice coils, while also reducing the weight of the magnetic circuit.

[0148] The present invention also proposes a terminal device, which includes a device body and the aforementioned sound-emitting device 100, the sound-emitting device 100 being connected to the device body. The specific structure of the sound-emitting device 100 is as described in the foregoing embodiments. Since this terminal device adopts all the technical solutions of all the foregoing embodiments, it has at least all the beneficial effects brought about by the technical solutions of the foregoing embodiments, which will not be elaborated here.

[0149] In this embodiment, the main body of the device is provided with a first sound outlet and a second sound outlet. The first sound outlet corresponds to the first diaphragm assembly 211 / second diaphragm assembly 221 of the sound-generating device 100, and the second sound outlet is connected to the rear sound hole of the sound-generating device 100.

[0150] Understandably, there can be one first sound outlet, which can be connected to the first diaphragm assembly 211 and the second diaphragm assembly 221 of the sound-generating device 100 via a sound channel. Of course, in other embodiments, the first sound outlet may also include two sub-sound outlets, which are connected to the first diaphragm assembly 211 and the second diaphragm assembly 221 respectively, and this is not limited here.

[0151] Optionally, the terminal device can be a vehicle, wearable device, etc., and is not limited here. In this embodiment, a vehicle is used as an example for description. The main body of the device includes a door, the door is provided with an installation space and a sound outlet communicating with 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 correspondingly arranged with the sound outlet, which is not limited here.

[0152] The above description is merely an optional embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made under the concept of the present invention using the description and drawings of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A sound-generating device, characterized in that, The sound-generating device includes: A housing having cavities open at both ends; A 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 being respectively connected to both ends of the housing and covering the opening, the first voice coil being a rectangular voice coil, and the second voice coil being a racetrack-shaped voice coil; and A magnetic circuit system is disposed between the first diaphragm assembly and the second diaphragm assembly. The magnetic circuit system has 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 in communication with 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. The magnetic circuit system includes an outer magnetic circuit portion, a connector, and a central magnetic circuit portion. The connector is made of a non-magnetic material and includes a first connecting portion and two second connecting portions. The two second connecting portions are respectively connected to the two ends of the first connecting portion. One end of the central magnetic circuit portion and the outer side of the two second connecting portions cooperate with one end of the outer magnetic circuit portion to form a second magnetic gap. The other end of the central magnetic circuit portion, the other end of the outer magnetic circuit portion, and the inner side of the two second connecting portions enclose and form the first magnetic gap. The first magnetic gap is a rectangular magnetic gap, and the second magnetic gap is a racetrack-shaped magnetic gap.

2. The sound-generating device according to claim 1, characterized in that, The housing also has an installation cavity located within the cavity, the outer magnetic circuit portion is located within the installation cavity, the outer magnetic circuit portion forms a receiving cavity, the connector is located within the receiving cavity, the two second connecting portions are connected to the outer magnetic circuit portion, and the central magnetic circuit portion is located within the receiving cavity and is fixedly connected to the first connecting portion.

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 first magnetic gap and the second magnetic gap, wherein the portion of the first magnetic gap corresponding to the long axis segment and the portion of the second magnetic gap corresponding to the long side segment are connected.

4. The sound-generating device according to claim 3, characterized in that, The first connecting part and the two second connecting parts together form 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 stacked together. The first connecting portion is disposed 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 apart from the second connecting portion 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. A fixing groove is recessed on the second surface and extends through the second washer along the direction of the long axis segment. The first connecting portion is disposed in the fixing groove.

6. The sound-generating device according to claim 5, characterized in that, The side of the first connecting portion facing the second magnet is flush with the second surface; And / or, the width of the fixing groove along the short axis 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 short axis segment is 2mm~3.5mm; And / or, the depth of the fixing groove along the axial direction of the second magnetic gap is 1.5mm~2.5mm; 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 0.8mm~1.5mm; And / or, the length of the long axis segment is equivalent to the length of the long side segment.

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 first magnet and the second magnet are magnetized in the same direction; 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 less than the thickness of the second washer; And / or, the thickness of the third washer is less than the thickness of the second washer; And / or, the second washer has a protruding edge on the periphery adjacent to the second surface, such that the width of the first surface along the short axis is smaller than the width of the second surface along the short axis. And / or, the first surface is rectangular, and the outline of the first washer and the outline 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-shaped iron, which has a cylindrical structure with open ends to form the accommodating cavity. One end of the U-shaped iron is bent and extended toward the accommodating cavity to form a bent portion. The bent portion is connected to the second connecting portion. The inner sides of the bent portion and the second connecting portion are spaced apart from one end of the central magnetic circuit portion to form the first magnetic gap.

9. The sound-generating device according to claim 8, characterized in that, The bent portion encloses and forms a rectangular opening, and the end of the U-shaped iron away from the bent portion forms a racetrack-shaped opening. And / or, each of the second connecting portions is provided with a positioning post, and the bent portion is provided with a positioning hole corresponding to each positioning post, with the positioning post passing through the positioning hole; And / or, each of the second connecting portions has a first arcuate sidewall, a stepped surface and a second arcuate sidewall connected in sequence on the side facing the inner wall of the accommodating cavity, the second arcuate sidewall abutting against the inner wall of the accommodating cavity, and the first arcuate sidewall being spaced from the inner wall of the accommodating cavity to cooperate in forming the second magnetic gap. And / or, the outer wall of the U-shaped iron is provided with a boss, the boss extends toward the side away from the receiving cavity, the U-shaped iron is disposed in the mounting cavity, and the boss is limited and abutted against the end face of one end of the mounting cavity; And / or, the U-shaped iron is welded to the cavity wall of the mounting cavity; or, the U-shaped iron is bonded to the cavity wall of the mounting cavity.

10. The sound-generating device according to any one of claims 1 to 9, characterized in that, Both the first diaphragm assembly and the second diaphragm assembly include a cone and a diaphragm disposed around the cone. The periphery of the diaphragm is connected to the housing, 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 assembly and the second vibration assembly further include a bracket and a centering support. The bracket is connected to the cone and surrounds the first voice coil or the second voice coil. One end of the centering support is connected to the bracket, and the other end of the centering support is connected to the housing.

12. The sound-generating device according to claim 11, characterized in that, The housing includes: The outer casing is a cylindrical structure with openings at both ends, and the outer casing has the cavity; The mounting part has a mounting cavity and is located within the cavity; and A fixing part is provided inside the cavity and connects the outer shell and the mounting part.

13. The sound-generating device according to claim 12, characterized in that, The centering support is a spring wave structure; And / or, the two centering supports are located on opposite sides of the fixing part and are symmetrically arranged with respect to the fixing part; And / or, the two brackets are located on opposite sides of the fixing part and are arranged symmetrically with respect to the fixing part; And / or, the two diaphragms are located on opposite sides of the fixing part and are arranged symmetrically with respect to the fixing part; And / or, each of the diaphragms includes an inner fixing part, a folded ring part, and an outer fixing part connected in sequence, wherein the inner fixing part is connected to the cone, and the outer fixing part is connected to the housing; And / or, the distance between the bracket and the mounting part is 1mm~2mm; 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 part is provided with a third through hole; And / or, the inner wall of the outer shell is provided with two support platforms, the two support platforms are located on opposite sides of the fixing part, and the periphery of each centering support piece is connected to one of the support platforms.

14. A terminal device, characterized in that, It includes a device body and a sound-generating device as described in any one of claims 1 to 13, wherein the sound-generating device is connected to the device body.

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